This file is indexed.

/usr/share/doc/python3-postgresql/html/_modules/postgresql/api.html is in python3-postgresql 1.1.0-2+b1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    
    <title>postgresql.api &mdash; py-postgresql 1.1.0 documentation</title>
    
    <link rel="stylesheet" href="../../_static/default.css" type="text/css" />
    <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
    
    <script type="text/javascript">
      var DOCUMENTATION_OPTIONS = {
        URL_ROOT:    '../../',
        VERSION:     '1.1.0',
        COLLAPSE_INDEX: false,
        FILE_SUFFIX: '.html',
        HAS_SOURCE:  true
      };
    </script>
    <script type="text/javascript" src="../../_static/jquery.js"></script>
    <script type="text/javascript" src="../../_static/underscore.js"></script>
    <script type="text/javascript" src="../../_static/doctools.js"></script>
    <link rel="top" title="py-postgresql 1.1.0 documentation" href="../../index.html" />
    <link rel="up" title="postgresql" href="../postgresql.html" />
 
<link rel="stylesheet" href="_static/unsuck.css" type="text/css" />

  </head>
  <body>
    <div class="related">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../../genindex.html" title="General Index"
             accesskey="I">index</a></li>
        <li class="right" >
          <a href="../../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li><a href="../../index.html">py-postgresql 1.1.0 documentation</a> &raquo;</li>
          <li><a href="../index.html" >Module code</a> &raquo;</li>
          <li><a href="../postgresql.html" accesskey="U">postgresql</a> &raquo;</li> 
      </ul>
    </div>  

    <div class="document">
      <div class="documentwrapper">
        <div class="bodywrapper">
          <div class="body">
            
  <h1>Source code for postgresql.api</h1><div class="highlight"><pre>
<span class="c">##</span>
<span class="c"># .api - ABCs for database interface elements</span>
<span class="c">##</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">Application Programmer Interfaces for PostgreSQL.</span>

<span class="sd">``postgresql.api`` is a collection of Python APIs for the PostgreSQL DBMS. It</span>
<span class="sd">is designed to take full advantage of PostgreSQL&#39;s features to provide the</span>
<span class="sd">Python programmer with substantial convenience.</span>

<span class="sd">This module is used to define &quot;PG-API&quot;. It creates a set of ABCs</span>
<span class="sd">that makes up the basic interfaces used to work with a PostgreSQL server.</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">import</span> <span class="nn">collections</span>
<span class="kn">import</span> <span class="nn">abc</span>

<span class="kn">from</span> <span class="nn">.python.element</span> <span class="kn">import</span> <span class="n">Element</span>

<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span>
	<span class="s">&#39;Message&#39;</span><span class="p">,</span>
	<span class="s">&#39;Statement&#39;</span><span class="p">,</span>
	<span class="s">&#39;Chunks&#39;</span><span class="p">,</span>
	<span class="s">&#39;Cursor&#39;</span><span class="p">,</span>
	<span class="s">&#39;Connector&#39;</span><span class="p">,</span>
	<span class="s">&#39;Category&#39;</span><span class="p">,</span>
	<span class="s">&#39;Database&#39;</span><span class="p">,</span>
	<span class="s">&#39;TypeIO&#39;</span><span class="p">,</span>
	<span class="s">&#39;Connection&#39;</span><span class="p">,</span>
	<span class="s">&#39;Transaction&#39;</span><span class="p">,</span>
	<span class="s">&#39;Settings&#39;</span><span class="p">,</span>
	<span class="s">&#39;StoredProcedure&#39;</span><span class="p">,</span>
	<span class="s">&#39;Driver&#39;</span><span class="p">,</span>
	<span class="s">&#39;Installation&#39;</span><span class="p">,</span>
	<span class="s">&#39;Cluster&#39;</span><span class="p">,</span>
<span class="p">]</span>

<div class="viewcode-block" id="Message"><a class="viewcode-back" href="../../reference.html#postgresql.api.Message">[docs]</a><span class="k">class</span> <span class="nc">Message</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	A message emitted by PostgreSQL.</span>
<span class="sd">	A message being a NOTICE, WARNING, INFO, etc.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;MESSAGE&#39;</span>

	<span class="n">severities</span> <span class="o">=</span> <span class="p">(</span>
		<span class="s">&#39;DEBUG&#39;</span><span class="p">,</span>
		<span class="s">&#39;INFO&#39;</span><span class="p">,</span>
		<span class="s">&#39;NOTICE&#39;</span><span class="p">,</span>
		<span class="s">&#39;WARNING&#39;</span><span class="p">,</span>
		<span class="s">&#39;ERROR&#39;</span><span class="p">,</span>
		<span class="s">&#39;FATAL&#39;</span><span class="p">,</span>
		<span class="s">&#39;PANIC&#39;</span><span class="p">,</span>
	<span class="p">)</span>
	<span class="n">sources</span> <span class="o">=</span> <span class="p">(</span>
		<span class="s">&#39;SERVER&#39;</span><span class="p">,</span>
		<span class="s">&#39;CLIENT&#39;</span><span class="p">,</span>
	<span class="p">)</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Message.source"><a class="viewcode-back" href="../../reference.html#postgresql.api.Message.source">[docs]</a>	<span class="k">def</span> <span class="nf">source</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Where the message originated from. Normally, &#39;SERVER&#39;, but sometimes</span>
<span class="sd">		&#39;CLIENT&#39;.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Message.code"><a class="viewcode-back" href="../../reference.html#postgresql.api.Message.code">[docs]</a>	<span class="k">def</span> <span class="nf">code</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The SQL state code of the message.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Message.message"><a class="viewcode-back" href="../../reference.html#postgresql.api.Message.message">[docs]</a>	<span class="k">def</span> <span class="nf">message</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The primary message string.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Message.details"><a class="viewcode-back" href="../../reference.html#postgresql.api.Message.details">[docs]</a>	<span class="k">def</span> <span class="nf">details</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">dict</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The additional details given with the message. Common keys *should* be the</span>
<span class="sd">		following:</span>

<span class="sd">		 * &#39;severity&#39;</span>
<span class="sd">		 * &#39;context&#39;</span>
<span class="sd">		 * &#39;detail&#39;</span>
<span class="sd">		 * &#39;hint&#39;</span>
<span class="sd">		 * &#39;file&#39;</span>
<span class="sd">		 * &#39;line&#39;</span>
<span class="sd">		 * &#39;function&#39;</span>
<span class="sd">		 * &#39;position&#39;</span>
<span class="sd">		 * &#39;internal_position&#39;</span>
<span class="sd">		 * &#39;internal_query&#39;</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Message.isconsistent"><a class="viewcode-back" href="../../reference.html#postgresql.api.Message.isconsistent">[docs]</a>	<span class="k">def</span> <span class="nf">isconsistent</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">bool</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Whether the fields of the `other` Message object is consistent with the</span>
<span class="sd">		fields of `self`.</span>

<span class="sd">		This *must* return the result of the comparison of code, source, message,</span>
<span class="sd">		and details.</span>

<span class="sd">		This method is provided as the alternative to overriding equality;</span>
<span class="sd">		often, pointer equality is the desirable means for comparison, but</span>
<span class="sd">		equality of the fields is also necessary.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div></div>
<span class="k">class</span> <span class="nc">Result</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	A result is an object managing the results of a prepared statement.</span>

<span class="sd">	These objects represent a binding of parameters to a given statement object.</span>

<span class="sd">	For results that were constructed on the server and a reference passed back</span>
<span class="sd">	to the client, statement and parameters may be None.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;RESULT&#39;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;statement&#39;</span><span class="p">,</span> <span class="s">&#39;parameters&#39;</span><span class="p">,</span> <span class="s">&#39;cursor_id&#39;</span><span class="p">)</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Close the Result handle.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">cursor_id</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The cursor&#39;s identifier.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">sql_column_types</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">str</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The type of the columns produced by the cursor.</span>

<span class="sd">		A sequence of `str` objects stating the SQL type name::</span>

<span class="sd">			[&#39;INTEGER&#39;, &#39;CHARACTER VARYING&#39;, &#39;INTERVAL&#39;]</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">pg_column_types</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">int</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The type Oids of the columns produced by the cursor.</span>

<span class="sd">		A sequence of `int` objects stating the SQL type name::</span>

<span class="sd">			[27, 28]</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">column_names</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">str</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The attribute names of the columns produced by the cursor.</span>

<span class="sd">		A sequence of `str` objects stating the column name::</span>

<span class="sd">			[&#39;column1&#39;, &#39;column2&#39;, &#39;emp_name&#39;]</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">column_types</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">str</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The Python types of the columns produced by the cursor.</span>

<span class="sd">		A sequence of type objects::</span>

<span class="sd">			[&lt;class &#39;int&#39;&gt;, &lt;class &#39;str&#39;&gt;]</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">parameters</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">(</span><span class="nb">tuple</span><span class="p">,</span> <span class="bp">None</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The parameters bound to the cursor. `None`, if unknown and an empty tuple</span>
<span class="sd">		`()`, if no parameters were given.</span>

<span class="sd">		These should be the *original* parameters given to the invoked statement.</span>

<span class="sd">		This should only be `None` when the cursor is created from an identifier,</span>
<span class="sd">		`postgresql.api.Database.cursor_from_id`.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">statement</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">(</span><span class="s">&quot;Statement&quot;</span><span class="p">,</span> <span class="bp">None</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The query object used to create the cursor. `None`, if unknown.</span>

<span class="sd">		This should only be `None` when the cursor is created from an identifier,</span>
<span class="sd">		`postgresql.api.Database.cursor_from_id`.</span>
<span class="sd">		&quot;&quot;&quot;</span>

<span class="k">class</span> <span class="nc">Chunks</span><span class="p">(</span>
	<span class="n">Result</span><span class="p">,</span>
	<span class="n">collections</span><span class="o">.</span><span class="n">Iterator</span><span class="p">,</span>
	<span class="n">collections</span><span class="o">.</span><span class="n">Iterable</span><span class="p">,</span>
<span class="p">):</span>
	<span class="k">pass</span>

<div class="viewcode-block" id="Cursor"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cursor">[docs]</a><span class="k">class</span> <span class="nc">Cursor</span><span class="p">(</span>
	<span class="n">Result</span><span class="p">,</span>
	<span class="n">collections</span><span class="o">.</span><span class="n">Iterator</span><span class="p">,</span>
	<span class="n">collections</span><span class="o">.</span><span class="n">Iterable</span><span class="p">,</span>
<span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	A `Cursor` object is an interface to a sequence of tuples(rows). A result</span>
<span class="sd">	set. Cursors publish a file-like interface for reading tuples from a cursor</span>
<span class="sd">	declared on the database.</span>

<span class="sd">	`Cursor` objects are created by invoking the `Statement.declare`</span>
<span class="sd">	method or by opening a cursor using an identifier via the</span>
<span class="sd">	`Database.cursor_from_id` method.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;CURSOR&#39;</span>

	<span class="n">_seek_whence_map</span> <span class="o">=</span> <span class="p">{</span>
		<span class="mi">0</span> <span class="p">:</span> <span class="s">&#39;ABSOLUTE&#39;</span><span class="p">,</span>
		<span class="mi">1</span> <span class="p">:</span> <span class="s">&#39;RELATIVE&#39;</span><span class="p">,</span>
		<span class="mi">2</span> <span class="p">:</span> <span class="s">&#39;FROM_END&#39;</span><span class="p">,</span>
		<span class="mi">3</span> <span class="p">:</span> <span class="s">&#39;FORWARD&#39;</span><span class="p">,</span>
		<span class="mi">4</span> <span class="p">:</span> <span class="s">&#39;BACKWARD&#39;</span>
	<span class="p">}</span>
	<span class="n">_direction_map</span> <span class="o">=</span> <span class="p">{</span>
		<span class="bp">True</span> <span class="p">:</span> <span class="s">&#39;FORWARD&#39;</span><span class="p">,</span>
		<span class="bp">False</span> <span class="p">:</span> <span class="s">&#39;BACKWARD&#39;</span><span class="p">,</span>
	<span class="p">}</span>

	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cursor.clone"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cursor.clone">[docs]</a>	<span class="k">def</span> <span class="nf">clone</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s">&quot;Cursor&quot;</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create a new cursor using the same factors as `self`.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="bp">self</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cursor.direction"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cursor.direction">[docs]</a>	<span class="k">def</span> <span class="nf">direction</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">bool</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The default `direction` argument for read().</span>

<span class="sd">		When `True` reads are FORWARD.</span>
<span class="sd">		When `False` reads are BACKWARD.</span>

<span class="sd">		Cursor operation option.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cursor.read"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cursor.read">[docs]</a>	<span class="k">def</span> <span class="nf">read</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">quantity</span> <span class="p">:</span> <span class="s">&quot;Number of rows to read&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">direction</span> <span class="p">:</span> <span class="s">&quot;Direction to fetch in, defaults to `self.direction`&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
	<span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="s">&quot;Row&quot;</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Read, fetch, the specified number of rows and return them in a list.</span>
<span class="sd">		If quantity is `None`, all records will be fetched.</span>

<span class="sd">		`direction` can be used to override the default configured direction.</span>

<span class="sd">		This alters the cursor&#39;s position.</span>

<span class="sd">		Read does not directly correlate to FETCH. If zero is given as the</span>
<span class="sd">		quantity, an empty sequence *must* be returned.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__next__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s">&quot;Row&quot;</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Get the next tuple in the cursor.</span>
<span class="sd">		Advances the cursor position by one.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cursor.seek"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cursor.seek">[docs]</a>	<span class="k">def</span> <span class="nf">seek</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">offset</span><span class="p">,</span> <span class="n">whence</span> <span class="o">=</span> <span class="s">&#39;ABSOLUTE&#39;</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Set the cursor&#39;s position to the given offset with respect to the</span>
<span class="sd">		whence parameter and the configured direction.</span>

<span class="sd">		Whence values:</span>

<span class="sd">		 ``0`` or ``&quot;ABSOLUTE&quot;``</span>
<span class="sd">		  Absolute.</span>
<span class="sd">		 ``1`` or ``&quot;RELATIVE&quot;``</span>
<span class="sd">		  Relative.</span>
<span class="sd">		 ``2`` or ``&quot;FROM_END&quot;``</span>
<span class="sd">		  Absolute from end.</span>
<span class="sd">		 ``3`` or ``&quot;FORWARD&quot;``</span>
<span class="sd">		  Relative forward.</span>
<span class="sd">		 ``4`` or ``&quot;BACKWARD&quot;``</span>
<span class="sd">		  Relative backward.</span>

<span class="sd">		Direction effects whence. If direction is BACKWARD, ABSOLUTE positioning</span>
<span class="sd">		will effectively be FROM_END, RELATIVE&#39;s position will be negated, and</span>
<span class="sd">		FROM_END will effectively be ABSOLUTE.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div></div>
<span class="k">class</span> <span class="nc">Execution</span><span class="p">(</span><span class="n">metaclass</span> <span class="o">=</span> <span class="n">abc</span><span class="o">.</span><span class="n">ABCMeta</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	The abstract class of execution methods.</span>
<span class="sd">	&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">parameters</span> <span class="p">:</span> <span class="s">&quot;Positional Parameters&quot;</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="s">&quot;Row&quot;</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Execute the prepared statement with the given arguments as parameters.</span>

<span class="sd">		Usage:</span>

<span class="sd">		&gt;&gt;&gt; p=db.prepare(&quot;SELECT column FROM ttable WHERE key = $1&quot;)</span>
<span class="sd">		&gt;&gt;&gt; p(&#39;identifier&#39;)</span>
<span class="sd">		[...]</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">column</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">parameters</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">collections</span><span class="o">.</span><span class="n">Iterable</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return an iterator producing the values of first column of the</span>
<span class="sd">		rows produced by the cursor created from the statement bound with the</span>
<span class="sd">		given parameters.</span>

<span class="sd">		Column iterators are never scrollable.</span>

<span class="sd">		Supporting cursors will be WITH HOLD when outside of a transaction to</span>
<span class="sd">		allow cross-transaction access.</span>

<span class="sd">		`column` is designed for the situations involving large data sets.</span>

<span class="sd">		Each iteration returns a single value.</span>

<span class="sd">		column expressed in sibling terms::</span>

<span class="sd">			return map(operator.itemgetter(0), self.rows(*parameters))</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">chunks</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">parameters</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">collections</span><span class="o">.</span><span class="n">Iterable</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return an iterator producing sequences of rows produced by the cursor</span>
<span class="sd">		created from the statement bound with the given parameters.</span>

<span class="sd">		Chunking iterators are *never* scrollable.</span>

<span class="sd">		Supporting cursors will be WITH HOLD when outside of a transaction.</span>

<span class="sd">		`chunks` is designed for moving large data sets efficiently.</span>

<span class="sd">		Each iteration returns sequences of rows *normally* of length(seq) ==</span>
<span class="sd">		chunksize. If chunksize is unspecified, a default, positive integer will</span>
<span class="sd">		be filled in. The rows contained in the sequences are only required to</span>
<span class="sd">		support the basic `collections.Sequence` interfaces; simple and quick</span>
<span class="sd">		sequence types should be used.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">rows</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">parameters</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">collections</span><span class="o">.</span><span class="n">Iterable</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return an iterator producing rows produced by the cursor</span>
<span class="sd">		created from the statement bound with the given parameters.</span>

<span class="sd">		Row iterators are never scrollable.</span>

<span class="sd">		Supporting cursors will be WITH HOLD when outside of a transaction to</span>
<span class="sd">		allow cross-transaction access.</span>

<span class="sd">		`rows` is designed for the situations involving large data sets.</span>

<span class="sd">		Each iteration returns a single row. Arguably, best implemented::</span>

<span class="sd">			return itertools.chain.from_iterable(self.chunks(*parameters))</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">column</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">parameters</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">collections</span><span class="o">.</span><span class="n">Iterable</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return an iterator producing the values of the first column in</span>
<span class="sd">		the cursor created from the statement bound with the given parameters.</span>

<span class="sd">		Column iterators are never scrollable.</span>

<span class="sd">		Supporting cursors will be WITH HOLD when outside of a transaction to</span>
<span class="sd">		allow cross-transaction access.</span>

<span class="sd">		`column` is designed for the situations involving large data sets.</span>

<span class="sd">		Each iteration returns a single value. `column` is equivalent to::</span>

<span class="sd">			return map(operator.itemgetter(0), self.rows(*parameters))</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">declare</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">parameters</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Cursor</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return a scrollable cursor with hold using the statement bound with the</span>
<span class="sd">		given parameters.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">first</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">parameters</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s">&quot;&#39;First&#39; object that is returned by the query&quot;</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Execute the prepared statement with the given arguments as parameters.</span>
<span class="sd">		If the statement returns rows with multiple columns, return the first</span>
<span class="sd">		row. If the statement returns rows with a single column, return the</span>
<span class="sd">		first column in the first row. If the query does not return rows at all,</span>
<span class="sd">		return the count or `None` if no count exists in the completion message.</span>

<span class="sd">		Usage:</span>

<span class="sd">		&gt;&gt;&gt; db.prepare(&quot;SELECT * FROM ttable WHERE key = $1&quot;).first(&quot;somekey&quot;)</span>
<span class="sd">		(&#39;somekey&#39;, &#39;somevalue&#39;)</span>
<span class="sd">		&gt;&gt;&gt; db.prepare(&quot;SELECT &#39;foo&#39;&quot;).first()</span>
<span class="sd">		&#39;foo&#39;</span>
<span class="sd">		&gt;&gt;&gt; db.prepare(&quot;INSERT INTO atable (col) VALUES (1)&quot;).first()</span>
<span class="sd">		1</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">load_rows</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">iterable</span> <span class="p">:</span> <span class="s">&quot;A iterable of tuples to execute the statement with&quot;</span>
	<span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Given an iterable, `iterable`, feed the produced parameters to the</span>
<span class="sd">		query. This is a bulk-loading interface for parameterized queries.</span>

<span class="sd">		Effectively, it is equivalent to:</span>

<span class="sd">			&gt;&gt;&gt; q = db.prepare(sql)</span>
<span class="sd">			&gt;&gt;&gt; for i in iterable:</span>
<span class="sd">			...  q(*i)</span>

<span class="sd">		Its purpose is to allow the implementation to take advantage of the</span>
<span class="sd">		knowledge that a series of parameters are to be loaded so that the</span>
<span class="sd">		operation can be optimized.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">load_chunks</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">iterable</span> <span class="p">:</span> <span class="s">&quot;A iterable of chunks of tuples to execute the statement with&quot;</span>
	<span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Given an iterable, `iterable`, feed the produced parameters of the chunks</span>
<span class="sd">		produced by the iterable to the query. This is a bulk-loading interface</span>
<span class="sd">		for parameterized queries.</span>

<span class="sd">		Effectively, it is equivalent to:</span>

<span class="sd">			&gt;&gt;&gt; ps = db.prepare(...)</span>
<span class="sd">			&gt;&gt;&gt; for c in iterable:</span>
<span class="sd">			...  for i in c:</span>
<span class="sd">			...   q(*i)</span>

<span class="sd">		Its purpose is to allow the implementation to take advantage of the</span>
<span class="sd">		knowledge that a series of chunks of parameters are to be loaded so</span>
<span class="sd">		that the operation can be optimized.</span>
<span class="sd">		&quot;&quot;&quot;</span>

<div class="viewcode-block" id="Statement"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement">[docs]</a><span class="k">class</span> <span class="nc">Statement</span><span class="p">(</span>
	<span class="n">Element</span><span class="p">,</span>
	<span class="n">collections</span><span class="o">.</span><span class="n">Callable</span><span class="p">,</span>
	<span class="n">collections</span><span class="o">.</span><span class="n">Iterable</span><span class="p">,</span>
<span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Instances of `Statement` are returned by the `prepare` method of</span>
<span class="sd">	`Database` instances.</span>

<span class="sd">	A Statement is an Iterable as well as Callable.</span>

<span class="sd">	The Iterable interface is supported for queries that take no arguments at</span>
<span class="sd">	all. It allows the syntax::</span>

<span class="sd">		&gt;&gt;&gt; for x in db.prepare(&#39;select * FROM table&#39;):</span>
<span class="sd">		...  pass</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;STATEMENT&#39;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;database&#39;</span><span class="p">,</span> <span class="s">&#39;statement_id&#39;</span><span class="p">,</span> <span class="s">&#39;string&#39;</span><span class="p">,)</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.statement_id"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.statement_id">[docs]</a>	<span class="k">def</span> <span class="nf">statement_id</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The statment&#39;s identifier.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.string"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.string">[docs]</a>	<span class="k">def</span> <span class="nf">string</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">object</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The SQL string of the prepared statement.</span>

<span class="sd">		`None` if not available. This can happen in cases where a statement is</span>
<span class="sd">		prepared on the server and a reference to the statement is sent to the</span>
<span class="sd">		client which subsequently uses the statement via the `Database`&#39;s</span>
<span class="sd">		`statement` constructor.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.sql_parameter_types"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.sql_parameter_types">[docs]</a>	<span class="k">def</span> <span class="nf">sql_parameter_types</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">str</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The type of the parameters required by the statement.</span>

<span class="sd">		A sequence of `str` objects stating the SQL type name::</span>

<span class="sd">			[&#39;INTEGER&#39;, &#39;VARCHAR&#39;, &#39;INTERVAL&#39;]</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.sql_column_types"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.sql_column_types">[docs]</a>	<span class="k">def</span> <span class="nf">sql_column_types</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">str</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The type of the columns produced by the statement.</span>

<span class="sd">		A sequence of `str` objects stating the SQL type name::</span>

<span class="sd">			[&#39;INTEGER&#39;, &#39;VARCHAR&#39;, &#39;INTERVAL&#39;]</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.pg_parameter_types"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.pg_parameter_types">[docs]</a>	<span class="k">def</span> <span class="nf">pg_parameter_types</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">int</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The type Oids of the parameters required by the statement.</span>

<span class="sd">		A sequence of `int` objects stating the PostgreSQL type Oid::</span>

<span class="sd">			[27, 28]</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.pg_column_types"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.pg_column_types">[docs]</a>	<span class="k">def</span> <span class="nf">pg_column_types</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">int</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The type Oids of the columns produced by the statement.</span>

<span class="sd">		A sequence of `int` objects stating the SQL type name::</span>

<span class="sd">			[27, 28]</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.column_names"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.column_names">[docs]</a>	<span class="k">def</span> <span class="nf">column_names</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">str</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The attribute names of the columns produced by the statement.</span>

<span class="sd">		A sequence of `str` objects stating the column name::</span>

<span class="sd">			[&#39;column1&#39;, &#39;column2&#39;, &#39;emp_name&#39;]</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.column_types"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.column_types">[docs]</a>	<span class="k">def</span> <span class="nf">column_types</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">type</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The Python types of the columns produced by the statement.</span>

<span class="sd">		A sequence of type objects::</span>

<span class="sd">			[&lt;class &#39;int&#39;&gt;, &lt;class &#39;str&#39;&gt;]</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.parameter_types"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.parameter_types">[docs]</a>	<span class="k">def</span> <span class="nf">parameter_types</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="nb">type</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The Python types expected of parameters given to the statement.</span>

<span class="sd">		A sequence of type objects::</span>

<span class="sd">			[&lt;class &#39;int&#39;&gt;, &lt;class &#39;str&#39;&gt;]</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.clone"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.clone">[docs]</a>	<span class="k">def</span> <span class="nf">clone</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s">&quot;Statement&quot;</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create a new statement object using the same factors as `self`.</span>

<span class="sd">		When used for refreshing plans, the new clone should replace references to</span>
<span class="sd">		the original.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Statement.close"><a class="viewcode-back" href="../../reference.html#postgresql.api.Statement.close">[docs]</a>	<span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Close the prepared statement releasing resources associated with it.</span>
<span class="sd">		&quot;&quot;&quot;</span></div></div>
<span class="n">Execution</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">Statement</span><span class="p">)</span>
<span class="n">PreparedStatement</span> <span class="o">=</span> <span class="n">Statement</span>

<div class="viewcode-block" id="StoredProcedure"><a class="viewcode-back" href="../../reference.html#postgresql.api.StoredProcedure">[docs]</a><span class="k">class</span> <span class="nc">StoredProcedure</span><span class="p">(</span>
	<span class="n">Element</span><span class="p">,</span>
	<span class="n">collections</span><span class="o">.</span><span class="n">Callable</span><span class="p">,</span>
<span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	A function stored on the database.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;FUNCTION&#39;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;database&#39;</span><span class="p">,)</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">(</span><span class="nb">object</span><span class="p">,</span> <span class="n">Cursor</span><span class="p">,</span> <span class="n">collections</span><span class="o">.</span><span class="n">Iterable</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Execute the procedure with the given arguments. If keyword arguments are</span>
<span class="sd">		passed they must be mapped to the argument whose name matches the key.</span>
<span class="sd">		If any positional arguments are given, they must fill in gaps created by</span>
<span class="sd">		the stated keyword arguments. If too few or too many arguments are</span>
<span class="sd">		given, a TypeError must be raised. If a keyword argument is passed where</span>
<span class="sd">		the procedure does not have a corresponding argument name, then,</span>
<span class="sd">		likewise, a TypeError must be raised.</span>

<span class="sd">		In the case where the `StoredProcedure` references a set returning</span>
<span class="sd">		function(SRF), the result *must* be an iterable. SRFs that return single</span>
<span class="sd">		columns *must* return an iterable of that column; not row data. If the</span>
<span class="sd">		SRF returns a composite(OUT parameters), it *should* return a `Cursor`.</span>
<span class="sd">		&quot;&quot;&quot;</span>

<span class="c">##</span>
<span class="c"># Arguably, it would be wiser to isolate blocks, and savepoints, but the utility</span>
<span class="c"># of the separation is not significant. It&#39;s really</span>
<span class="c"># more interesting as a formality that the user may explicitly state the</span>
<span class="c"># type of the transaction. However, this capability is not completely absent</span>
<span class="c"># from the current interface as the configuration parameters, or lack thereof,</span>
<span class="c"># help imply the expectations.</span></div>
<div class="viewcode-block" id="Transaction"><a class="viewcode-back" href="../../reference.html#postgresql.api.Transaction">[docs]</a><span class="k">class</span> <span class="nc">Transaction</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	A `Tranaction` is an element that represents a transaction in the session.</span>
<span class="sd">	Once created, it&#39;s ready to be started, and subsequently committed or</span>
<span class="sd">	rolled back.</span>

<span class="sd">	Read-only transaction:</span>

<span class="sd">		&gt;&gt;&gt; with db.xact(mode = &#39;read only&#39;):</span>
<span class="sd">		...  ...</span>

<span class="sd">	Read committed isolation:</span>

<span class="sd">		&gt;&gt;&gt; with db.xact(isolation = &#39;READ COMMITTED&#39;):</span>
<span class="sd">		...  ...</span>

<span class="sd">	Savepoints are created if inside a transaction block:</span>

<span class="sd">		&gt;&gt;&gt; with db.xact():</span>
<span class="sd">		...  with db.xact():</span>
<span class="sd">		...   ...</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;XACT&#39;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;database&#39;</span><span class="p">,)</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Transaction.mode"><a class="viewcode-back" href="../../reference.html#postgresql.api.Transaction.mode">[docs]</a>	<span class="k">def</span> <span class="nf">mode</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">(</span><span class="bp">None</span><span class="p">,</span> <span class="nb">str</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The mode of the transaction block:</span>

<span class="sd">			START TRANSACTION [ISOLATION] &lt;mode&gt;;</span>

<span class="sd">		The `mode` property is a string and will be directly interpolated into the</span>
<span class="sd">		START TRANSACTION statement.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Transaction.isolation"><a class="viewcode-back" href="../../reference.html#postgresql.api.Transaction.isolation">[docs]</a>	<span class="k">def</span> <span class="nf">isolation</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">(</span><span class="bp">None</span><span class="p">,</span> <span class="nb">str</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The isolation level of the transaction block:</span>

<span class="sd">			START TRANSACTION &lt;isolation&gt; [MODE];</span>

<span class="sd">		The `isolation` property is a string and will be directly interpolated into</span>
<span class="sd">		the START TRANSACTION statement.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Transaction.start"><a class="viewcode-back" href="../../reference.html#postgresql.api.Transaction.start">[docs]</a>	<span class="k">def</span> <span class="nf">start</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Start the transaction.</span>

<span class="sd">		If the database is in a transaction block, the transaction should be</span>
<span class="sd">		configured as a savepoint. If any transaction block configuration was</span>
<span class="sd">		applied to the transaction, raise a `postgresql.exceptions.OperationError`.</span>

<span class="sd">		If the database is not in a transaction block, start one using the</span>
<span class="sd">		configuration where:</span>

<span class="sd">		`self.isolation` specifies the ``ISOLATION LEVEL``. Normally, ``READ</span>
<span class="sd">		COMMITTED``, ``SERIALIZABLE``, or ``READ UNCOMMITTED``.</span>

<span class="sd">		`self.mode` specifies the mode of the transaction. Normally, ``READ</span>
<span class="sd">		ONLY`` or ``READ WRITE``.</span>

<span class="sd">		If the transaction is already open, do nothing.</span>

<span class="sd">		If the transaction has been committed or aborted, raise an</span>
<span class="sd">		`postgresql.exceptions.OperationError`.</span>
<span class="sd">		&quot;&quot;&quot;</span></div>
	<span class="n">begin</span> <span class="o">=</span> <span class="n">start</span>

	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Transaction.commit"><a class="viewcode-back" href="../../reference.html#postgresql.api.Transaction.commit">[docs]</a>	<span class="k">def</span> <span class="nf">commit</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Commit the transaction.</span>

<span class="sd">		If the transaction is a block, issue a COMMIT statement.</span>

<span class="sd">		If the transaction was started inside a transaction block, it should be</span>
<span class="sd">		identified as a savepoint, and the savepoint should be released.</span>

<span class="sd">		If the transaction has already been committed, do nothing.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Transaction.rollback"><a class="viewcode-back" href="../../reference.html#postgresql.api.Transaction.rollback">[docs]</a>	<span class="k">def</span> <span class="nf">rollback</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Abort the transaction.</span>

<span class="sd">		If the transaction is a savepoint, ROLLBACK TO the savepoint identifier.</span>

<span class="sd">		If the transaction is a transaction block, issue an ABORT.</span>

<span class="sd">		If the transaction has already been aborted, do nothing.</span>
<span class="sd">		&quot;&quot;&quot;</span></div>
	<span class="n">abort</span> <span class="o">=</span> <span class="n">rollback</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Run the `start` method and return self.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">typ</span><span class="p">,</span> <span class="n">obj</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		If an exception is indicated by the parameters, run the transaction&#39;s</span>
<span class="sd">		`rollback` method iff the database is still available(not closed), and</span>
<span class="sd">		return a `False` value.</span>

<span class="sd">		If an exception is not indicated, but the database&#39;s transaction state is</span>
<span class="sd">		in error, run the transaction&#39;s `rollback` method and raise a</span>
<span class="sd">		`postgresql.exceptions.InFailedTransactionError`. If the database is</span>
<span class="sd">		unavailable, the `rollback` method should cause a</span>
<span class="sd">		`postgresql.exceptions.ConnectionDoesNotExistError` exception to occur.</span>

<span class="sd">		Otherwise, run the transaction&#39;s `commit` method.</span>

<span class="sd">		When the `commit` is ultimately unsuccessful or not ran at all, the purpose</span>
<span class="sd">		of __exit__ is to resolve the error state of the database iff the</span>
<span class="sd">		database is available(not closed) so that more commands can be after the</span>
<span class="sd">		block&#39;s exit.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
<div class="viewcode-block" id="Settings"><a class="viewcode-back" href="../../reference.html#postgresql.api.Settings">[docs]</a><span class="k">class</span> <span class="nc">Settings</span><span class="p">(</span>
	<span class="n">Element</span><span class="p">,</span>
	<span class="n">collections</span><span class="o">.</span><span class="n">MutableMapping</span>
<span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	A mapping interface to the session&#39;s settings. This provides a direct</span>
<span class="sd">	interface to ``SHOW`` or ``SET`` commands. Identifiers and values need</span>
<span class="sd">	not be quoted specially as the implementation must do that work for the</span>
<span class="sd">	user.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;SETTINGS&#39;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return the setting corresponding to the given key. The result should be</span>
<span class="sd">		consistent with what the ``SHOW`` command returns. If the key does not</span>
<span class="sd">		exist, raise a KeyError.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__setitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Set the setting with the given key to the given value. The action should</span>
<span class="sd">		be consistent with the effect of the ``SET`` command.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create a context manager applying the given settings on __enter__ and</span>
<span class="sd">		restoring the old values on __exit__.</span>

<span class="sd">		&gt;&gt;&gt; with db.settings(search_path = &#39;local,public&#39;):</span>
<span class="sd">		...  ...</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Settings.get"><a class="viewcode-back" href="../../reference.html#postgresql.api.Settings.get">[docs]</a>	<span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">default</span> <span class="o">=</span> <span class="bp">None</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Get the setting with the corresponding key. If the setting does not</span>
<span class="sd">		exist, return the `default`.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Settings.getset"><a class="viewcode-back" href="../../reference.html#postgresql.api.Settings.getset">[docs]</a>	<span class="k">def</span> <span class="nf">getset</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">keys</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return a dictionary containing the key-value pairs of the requested</span>
<span class="sd">		settings. If *any* of the keys do not exist, a `KeyError` must be raised</span>
<span class="sd">		with the set of keys that did not exist.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Settings.update"><a class="viewcode-back" href="../../reference.html#postgresql.api.Settings.update">[docs]</a>	<span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">mapping</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		For each key-value pair, incur the effect of the `__setitem__` method.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Settings.keys"><a class="viewcode-back" href="../../reference.html#postgresql.api.Settings.keys">[docs]</a>	<span class="k">def</span> <span class="nf">keys</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return an iterator to all of the settings&#39; keys.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Settings.values"><a class="viewcode-back" href="../../reference.html#postgresql.api.Settings.values">[docs]</a>	<span class="k">def</span> <span class="nf">values</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return an iterator to all of the settings&#39; values.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Settings.items"><a class="viewcode-back" href="../../reference.html#postgresql.api.Settings.items">[docs]</a>	<span class="k">def</span> <span class="nf">items</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return an iterator to all of the setting value pairs.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div></div>
<div class="viewcode-block" id="Database"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database">[docs]</a><span class="k">class</span> <span class="nc">Database</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	The interface to an individual database. `Connection` objects inherit from</span>
<span class="sd">	this</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;DATABASE&#39;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.backend_id"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.backend_id">[docs]</a>	<span class="k">def</span> <span class="nf">backend_id</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">(</span><span class="nb">int</span><span class="p">,</span> <span class="bp">None</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The backend&#39;s process identifier.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.version_info"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.version_info">[docs]</a>	<span class="k">def</span> <span class="nf">version_info</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">tuple</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		A version tuple of the database software similar Python&#39;s `sys.version_info`.</span>

<span class="sd">		&gt;&gt;&gt; db.version_info</span>
<span class="sd">		(8, 1, 3, &#39;&#39;, 0)</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.client_address"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.client_address">[docs]</a>	<span class="k">def</span> <span class="nf">client_address</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">(</span><span class="nb">str</span><span class="p">,</span> <span class="bp">None</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The client address that the server sees. This is obtainable by querying</span>
<span class="sd">		the ``pg_catalog.pg_stat_activity`` relation.</span>

<span class="sd">		`None` if unavailable.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.client_port"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.client_port">[docs]</a>	<span class="k">def</span> <span class="nf">client_port</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">(</span><span class="nb">int</span><span class="p">,</span> <span class="bp">None</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The client port that the server sees. This is obtainable by querying</span>
<span class="sd">		the ``pg_catalog.pg_stat_activity`` relation.</span>

<span class="sd">		`None` if unavailable.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.xact"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.xact">[docs]</a>	<span class="k">def</span> <span class="nf">xact</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">isolation</span> <span class="p">:</span> <span class="s">&quot;ISOLATION LEVEL to use with the transaction&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">mode</span> <span class="p">:</span> <span class="s">&quot;Mode of the transaction, READ ONLY or READ WRITE&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
	<span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Transaction</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create a `Transaction` object using the given keyword arguments as its</span>
<span class="sd">		configuration.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.settings"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.settings">[docs]</a>	<span class="k">def</span> <span class="nf">settings</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Settings</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		A `Settings` instance bound to the `Database`.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.do"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.do">[docs]</a>	<span class="k">def</span> <span class="nf">do</span><span class="p">(</span><span class="n">language</span><span class="p">,</span> <span class="n">source</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Execute a DO statement using the given language and source.</span>
<span class="sd">		Always returns `None`.</span>

<span class="sd">		Likely to be a function of Connection.execute.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.execute"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.execute">[docs]</a>	<span class="k">def</span> <span class="nf">execute</span><span class="p">(</span><span class="n">sql</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Execute an arbitrary block of SQL. Always returns `None` and raise</span>
<span class="sd">		an exception on error.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.prepare"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.prepare">[docs]</a>	<span class="k">def</span> <span class="nf">prepare</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sql</span> <span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Statement</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create a new `Statement` instance bound to the connection</span>
<span class="sd">		using the given SQL.</span>

<span class="sd">		&gt;&gt;&gt; s = db.prepare(&quot;SELECT 1&quot;)</span>
<span class="sd">		&gt;&gt;&gt; c = s()</span>
<span class="sd">		&gt;&gt;&gt; c.next()</span>
<span class="sd">		(1,)</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.statement_from_id"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.statement_from_id">[docs]</a>	<span class="k">def</span> <span class="nf">statement_from_id</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">statement_id</span> <span class="p">:</span> <span class="s">&quot;The statement&#39;s identification string.&quot;</span><span class="p">,</span>
	<span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Statement</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create a `Statement` object that was already prepared on the</span>
<span class="sd">		server. The distinction between this and a regular query is that it</span>
<span class="sd">		must be explicitly closed if it is no longer desired, and it is</span>
<span class="sd">		instantiated using the statement identifier as opposed to the SQL</span>
<span class="sd">		statement itself.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.cursor_from_id"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.cursor_from_id">[docs]</a>	<span class="k">def</span> <span class="nf">cursor_from_id</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">cursor_id</span> <span class="p">:</span> <span class="s">&quot;The cursor&#39;s identification string.&quot;</span>
	<span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Cursor</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create a `Cursor` object from the given `cursor_id` that was already</span>
<span class="sd">		declared on the server.</span>

<span class="sd">		`Cursor` objects created this way must *not* be closed when the object</span>
<span class="sd">		is garbage collected. Rather, the user must explicitly close it for</span>
<span class="sd">		the server resources to be released. This is in contrast to `Cursor`</span>
<span class="sd">		objects that are created by invoking a `Statement` or a SRF</span>
<span class="sd">		`StoredProcedure`.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.proc"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.proc">[docs]</a>	<span class="k">def</span> <span class="nf">proc</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">procedure_id</span> <span class="p">:</span> \
			<span class="s">&quot;The procedure identifier; a valid ``regprocedure`` or Oid.&quot;</span>
	<span class="p">)</span> <span class="o">-&gt;</span> <span class="n">StoredProcedure</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create a `StoredProcedure` instance using the given identifier.</span>

<span class="sd">		The `proc_id` given can be either an ``Oid``, or a ``regprocedure``</span>
<span class="sd">		that identifies the stored procedure to create the interface for.</span>

<span class="sd">		&gt;&gt;&gt; p = db.proc(&#39;version()&#39;)</span>
<span class="sd">		&gt;&gt;&gt; p()</span>
<span class="sd">		&#39;PostgreSQL 8.3.0&#39;</span>
<span class="sd">		&gt;&gt;&gt; qstr = &quot;select oid from pg_proc where proname = &#39;generate_series&#39;&quot;</span>
<span class="sd">		&gt;&gt;&gt; db.prepare(qstr).first()</span>
<span class="sd">		1069</span>
<span class="sd">		&gt;&gt;&gt; generate_series = db.proc(1069)</span>
<span class="sd">		&gt;&gt;&gt; list(generate_series(1,5))</span>
<span class="sd">		[1, 2, 3, 4, 5]</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.reset"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.reset">[docs]</a>	<span class="k">def</span> <span class="nf">reset</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Reset the connection into it&#39;s original state.</span>

<span class="sd">		Issues a ``RESET ALL`` to the database. If the database supports</span>
<span class="sd">		removing temporary tables created in the session, then remove them.</span>
<span class="sd">		Reapply initial configuration settings such as path.</span>

<span class="sd">		The purpose behind this method is to provide a soft-reconnect method</span>
<span class="sd">		that re-initializes the connection into its original state. One</span>
<span class="sd">		obvious use of this would be in a connection pool where the connection</span>
<span class="sd">		is being recycled.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.notify"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.notify">[docs]</a>	<span class="k">def</span> <span class="nf">notify</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">channels</span><span class="p">,</span> <span class="o">**</span><span class="n">channel_and_payload</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">int</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		NOTIFY the channels with the given payload.</span>

<span class="sd">		Equivalent to issuing &quot;NOTIFY &lt;channel&gt;&quot; or &quot;NOTIFY &lt;channel&gt;, &lt;payload&gt;&quot;</span>
<span class="sd">		for each item in `channels` and `channel_and_payload`. All NOTIFYs issued</span>
<span class="sd">		*must* occur in the same transaction.</span>

<span class="sd">		The items in `channels` can either be a string or a tuple. If a string,</span>
<span class="sd">		no payload is given, but if an item is a `builtins.tuple`, the second item</span>
<span class="sd">		will be given as the payload. `channels` offers a means to issue NOTIFYs</span>
<span class="sd">		in guaranteed order.</span>

<span class="sd">		The items in `channel_and_payload` are all payloaded NOTIFYs where the</span>
<span class="sd">		keys are the channels and the values are the payloads. Order is undefined.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.listen"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.listen">[docs]</a>	<span class="k">def</span> <span class="nf">listen</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">channels</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Start listening to the given channels.</span>

<span class="sd">		Equivalent to issuing &quot;LISTEN &lt;x&gt;&quot; for x in channels.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.unlisten"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.unlisten">[docs]</a>	<span class="k">def</span> <span class="nf">unlisten</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">channels</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Stop listening to the given channels.</span>

<span class="sd">		Equivalent to issuing &quot;UNLISTEN &lt;x&gt;&quot; for x in channels.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.listening_channels"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.listening_channels">[docs]</a>	<span class="k">def</span> <span class="nf">listening_channels</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="s">&quot;channel name&quot;</span><span class="p">,</span> <span class="o">...</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return an *iterator* to all the channels currently being listened to.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Database.iternotifies"><a class="viewcode-back" href="../../reference.html#postgresql.api.Database.iternotifies">[docs]</a>	<span class="k">def</span> <span class="nf">iternotifies</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">timeout</span> <span class="o">=</span> <span class="bp">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">collections</span><span class="o">.</span><span class="n">Iterator</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return an iterator to the notifications received by the connection. The</span>
<span class="sd">		iterator *must* produce triples in the form ``(channel, payload, pid)``.</span>

<span class="sd">		If timeout is not `None`, `None` *must* be emitted at the specified</span>
<span class="sd">		timeout interval. If the timeout is zero, all the pending notifications</span>
<span class="sd">		*must* be yielded by the iterator and then `StopIteration` *must* be</span>
<span class="sd">		raised.</span>

<span class="sd">		If the connection is closed for any reason, the iterator *must* silently</span>
<span class="sd">		stop by raising `StopIteration`. Further error control is then the</span>
<span class="sd">		responsibility of the user.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div></div>
<span class="k">class</span> <span class="nc">TypeIO</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;TYPIO&#39;</span>

	<span class="k">def</span> <span class="nf">_e_metas</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="p">()</span>

<span class="k">class</span> <span class="nc">SocketFactory</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">fatal_exception</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="ne">Exception</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The exception that is raised by sockets that indicate a fatal error.</span>

<span class="sd">		The exception can be a base exception as the `fatal_error_message` will</span>
<span class="sd">		indicate if that particular exception is actually fatal.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">timeout_exception</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="ne">Exception</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The exception raised by the socket when an operation could not be</span>
<span class="sd">		completed due to a configured time constraint.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">tryagain_exception</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="ne">Exception</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The exception raised by the socket when an operation was interrupted, but</span>
<span class="sd">		should be tried again.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">tryagain</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">err</span> <span class="p">:</span> <span class="ne">Exception</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">bool</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Whether or not `err` suggests the operation should be tried again.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">fatal_exception_message</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">err</span> <span class="p">:</span> <span class="ne">Exception</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">(</span><span class="nb">str</span><span class="p">,</span> <span class="bp">None</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		A function returning a string describing the failure, this string will be</span>
<span class="sd">		given to the `postgresql.exceptions.ConnectionFailure` instance that will</span>
<span class="sd">		subsequently be raised by the `Connection` object.</span>

<span class="sd">		Returns `None` when `err` is not actually fatal.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">socket_secure</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">socket</span> <span class="p">:</span> <span class="s">&quot;socket object&quot;</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s">&quot;secured socket&quot;</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return a reference to the secured socket using the given parameters.</span>

<span class="sd">		If securing the socket for the connector is impossible, the user should</span>
<span class="sd">		never be able to instantiate the connector with parameters requesting</span>
<span class="sd">		security.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">socket_factory_sequence</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="n">collections</span><span class="o">.</span><span class="n">Callable</span><span class="p">]:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Return a sequence of `SocketCreator`s that `Connection` objects will use to</span>
<span class="sd">		create the socket object.</span>
<span class="sd">		&quot;&quot;&quot;</span>

<div class="viewcode-block" id="Category"><a class="viewcode-back" href="../../reference.html#postgresql.api.Category">[docs]</a><span class="k">class</span> <span class="nc">Category</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	A category is an object that initializes the subject connection for a</span>
<span class="sd">	specific purpose.</span>

<span class="sd">	Arguably, a runtime class for use with connections.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;CATEGORY&#39;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">()</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">connection</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Initialize the given connection in order to conform to the category.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
<div class="viewcode-block" id="Connector"><a class="viewcode-back" href="../../reference.html#postgresql.api.Connector">[docs]</a><span class="k">class</span> <span class="nc">Connector</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	A connector is an object providing the necessary information to establish a</span>
<span class="sd">	connection. This includes credentials, database settings, and many times</span>
<span class="sd">	addressing information.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;CONNECTOR&#39;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;driver&#39;</span><span class="p">,</span> <span class="s">&#39;category&#39;</span><span class="p">)</span>

	<span class="k">def</span> <span class="nf">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create and connect. Arguments will be given to the `Connection` instance&#39;s</span>
<span class="sd">		`connect` method.</span>
<span class="sd">		&quot;&quot;&quot;</span>
		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">driver</span><span class="o">.</span><span class="n">connection</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">)</span>

	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">user</span> <span class="p">:</span> <span class="s">&quot;required keyword specifying the user name(str)&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">password</span> <span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">database</span> <span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">settings</span> <span class="p">:</span> <span class="p">(</span><span class="nb">dict</span><span class="p">,</span> <span class="p">[(</span><span class="nb">str</span><span class="p">,</span><span class="nb">str</span><span class="p">)])</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">category</span> <span class="p">:</span> <span class="n">Category</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
	<span class="p">):</span>
		<span class="k">if</span> <span class="n">user</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
			<span class="c"># sure, it&#39;s a &quot;required&quot; keyword, makes for better documentation</span>
			<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">&quot;&#39;user&#39; is a required keyword&quot;</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">user</span> <span class="o">=</span> <span class="n">user</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">password</span> <span class="o">=</span> <span class="n">password</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">database</span> <span class="o">=</span> <span class="n">database</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">settings</span> <span class="o">=</span> <span class="n">settings</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">category</span> <span class="o">=</span> <span class="n">category</span>
		<span class="k">if</span> <span class="n">category</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">category</span><span class="p">,</span> <span class="n">Category</span><span class="p">):</span>
			<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">&quot;&#39;category&#39; must a be `None` or `postgresql.api.Category`&quot;</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="Connection"><a class="viewcode-back" href="../../reference.html#postgresql.api.Connection">[docs]</a><span class="k">class</span> <span class="nc">Connection</span><span class="p">(</span><span class="n">Database</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	The interface to a connection to a PostgreSQL database. This is a</span>
<span class="sd">	`Database` interface with the additional connection management tools that</span>
<span class="sd">	are particular to using a remote database.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;CONNECTION&#39;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;connector&#39;</span><span class="p">,)</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Connection.connector"><a class="viewcode-back" href="../../reference.html#postgresql.api.Connection.connector">[docs]</a>	<span class="k">def</span> <span class="nf">connector</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Connector</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The :py:class:`Connector` instance facilitating the `Connection` object&#39;s</span>
<span class="sd">		communication and initialization.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Connection.query"><a class="viewcode-back" href="../../reference.html#postgresql.api.Connection.query">[docs]</a>	<span class="k">def</span> <span class="nf">query</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Execution</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The :py:class:`Execution` instance providing a one-shot query interface::</span>

<span class="sd">			connection.query.&lt;method&gt;(sql, *parameters) == connection.prepare(sql).&lt;method&gt;(*parameters)</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Connection.closed"><a class="viewcode-back" href="../../reference.html#postgresql.api.Connection.closed">[docs]</a>	<span class="k">def</span> <span class="nf">closed</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">bool</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		`True` if the `Connection` is closed, `False` if the `Connection` is</span>
<span class="sd">		open.</span>

<span class="sd">		&gt;&gt;&gt; db.closed</span>
<span class="sd">		True</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Connection.clone"><a class="viewcode-back" href="../../reference.html#postgresql.api.Connection.clone">[docs]</a>	<span class="k">def</span> <span class="nf">clone</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s">&quot;Connection&quot;</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create another connection using the same factors as `self`. The returned</span>
<span class="sd">		object should be open and ready for use.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Connection.connect"><a class="viewcode-back" href="../../reference.html#postgresql.api.Connection.connect">[docs]</a>	<span class="k">def</span> <span class="nf">connect</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Establish the connection to the server and initialize the category.</span>

<span class="sd">		Does nothing if the connection is already established.</span>
<span class="sd">		&quot;&quot;&quot;</span>
		<span class="n">cat</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">connector</span><span class="o">.</span><span class="n">category</span>
		<span class="k">if</span> <span class="n">cat</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
			<span class="n">cat</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Connection.close"><a class="viewcode-back" href="../../reference.html#postgresql.api.Connection.close">[docs]</a>	<span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="bp">None</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Close the connection.</span>

<span class="sd">		Does nothing if the connection is already closed.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Establish the connection and return self.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">typ</span><span class="p">,</span> <span class="n">obj</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Closes the connection and returns `False` when an exception is passed in,</span>
<span class="sd">		`True` when `None`.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
<div class="viewcode-block" id="Driver"><a class="viewcode-back" href="../../reference.html#postgresql.api.Driver">[docs]</a><span class="k">class</span> <span class="nc">Driver</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	The `Driver` element provides the `Connector` and other information</span>
<span class="sd">	pertaining to the implementation of the driver. Information about what the</span>
<span class="sd">	driver supports is available in instances.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&quot;DRIVER&quot;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">()</span>

	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Driver.connect"><a class="viewcode-back" href="../../reference.html#postgresql.api.Driver.connect">[docs]</a>	<span class="k">def</span> <span class="nf">connect</span><span class="p">(</span><span class="o">**</span><span class="n">kw</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create a connection using the given parameters for the Connector.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div></div>
<div class="viewcode-block" id="Installation"><a class="viewcode-back" href="../../reference.html#postgresql.api.Installation">[docs]</a><span class="k">class</span> <span class="nc">Installation</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Interface to a PostgreSQL installation. Instances would provide various</span>
<span class="sd">	information about an installation of PostgreSQL accessible by the Python</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&quot;INSTALLATION&quot;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">()</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Installation.version"><a class="viewcode-back" href="../../reference.html#postgresql.api.Installation.version">[docs]</a>	<span class="k">def</span> <span class="nf">version</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		A version string consistent with what `SELECT version()` would output.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Installation.version_info"><a class="viewcode-back" href="../../reference.html#postgresql.api.Installation.version_info">[docs]</a>	<span class="k">def</span> <span class="nf">version_info</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		A tuple specifying the version in a form similar to Python&#39;s</span>
<span class="sd">		sys.version_info. (8, 3, 3, &#39;final&#39;, 0)</span>

<span class="sd">		See `postgresql.versionstring`.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Installation.type"><a class="viewcode-back" href="../../reference.html#postgresql.api.Installation.type">[docs]</a>	<span class="k">def</span> <span class="nf">type</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The &quot;type&quot; of PostgreSQL. Normally, the first component of the string</span>
<span class="sd">		returned by pg_config.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Installation.ssl"><a class="viewcode-back" href="../../reference.html#postgresql.api.Installation.ssl">[docs]</a>	<span class="k">def</span> <span class="nf">ssl</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">bool</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Whether the installation supports SSL.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div></div>
<div class="viewcode-block" id="Cluster"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster">[docs]</a><span class="k">class</span> <span class="nc">Cluster</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Interface to a PostgreSQL cluster--a data directory. An implementation of</span>
<span class="sd">	this provides a means to control a server.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;CLUSTER&#39;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;installation&#39;</span><span class="p">,</span> <span class="s">&#39;data_directory&#39;</span><span class="p">)</span>

	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.installation"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.installation">[docs]</a>	<span class="k">def</span> <span class="nf">installation</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Installation</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The installation used by the cluster.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.data_directory"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.data_directory">[docs]</a>	<span class="k">def</span> <span class="nf">data_directory</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The path to the data directory of the cluster.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.init"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.init">[docs]</a>	<span class="k">def</span> <span class="nf">init</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">initdb</span> <span class="p">:</span> <span class="s">&quot;path to the initdb to use&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">user</span> <span class="p">:</span> <span class="s">&quot;name of the cluster&#39;s superuser&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">password</span> <span class="p">:</span> <span class="s">&quot;superuser&#39;s password&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">encoding</span> <span class="p">:</span> <span class="s">&quot;the encoding to use for the cluster&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">locale</span> <span class="p">:</span> <span class="s">&quot;the locale to use for the cluster&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">collate</span> <span class="p">:</span> <span class="s">&quot;the collation to use for the cluster&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">ctype</span> <span class="p">:</span> <span class="s">&quot;the ctype to use for the cluster&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">monetary</span> <span class="p">:</span> <span class="s">&quot;the monetary to use for the cluster&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">numeric</span> <span class="p">:</span> <span class="s">&quot;the numeric to use for the cluster&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">time</span> <span class="p">:</span> <span class="s">&quot;the time to use for the cluster&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">text_search_config</span> <span class="p">:</span> <span class="s">&quot;default text search configuration&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">xlogdir</span> <span class="p">:</span> <span class="s">&quot;location for the transaction log directory&quot;</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
	<span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Create the cluster at the `data_directory` associated with the Cluster</span>
<span class="sd">		instance.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.drop"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.drop">[docs]</a>	<span class="k">def</span> <span class="nf">drop</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Kill the server and completely remove the data directory.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.start"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.start">[docs]</a>	<span class="k">def</span> <span class="nf">start</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Start the cluster.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.stop"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.stop">[docs]</a>	<span class="k">def</span> <span class="nf">stop</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Signal the server to shutdown.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.kill"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.kill">[docs]</a>	<span class="k">def</span> <span class="nf">kill</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Kill the server.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.restart"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.restart">[docs]</a>	<span class="k">def</span> <span class="nf">restart</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Restart the cluster.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.wait_until_started"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.wait_until_started">[docs]</a>	<span class="k">def</span> <span class="nf">wait_until_started</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">timeout</span> <span class="p">:</span> <span class="s">&quot;maximum time to wait&quot;</span> <span class="o">=</span> <span class="mi">10</span>
	<span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		After the start() method is ran, the database may not be ready for use.</span>
<span class="sd">		This method provides a mechanism to block until the cluster is ready for</span>
<span class="sd">		use.</span>

<span class="sd">		If the `timeout` is reached, the method *must* throw a</span>
<span class="sd">		`postgresql.exceptions.ClusterTimeoutError`.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.wait_until_stopped"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.wait_until_stopped">[docs]</a>	<span class="k">def</span> <span class="nf">wait_until_stopped</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">timeout</span> <span class="p">:</span> <span class="s">&quot;maximum time to wait&quot;</span> <span class="o">=</span> <span class="mi">10</span>
	<span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		After the stop() method is ran, the database may still be running.</span>
<span class="sd">		This method provides a mechanism to block until the cluster is completely</span>
<span class="sd">		shutdown.</span>

<span class="sd">		If the `timeout` is reached, the method *must* throw a</span>
<span class="sd">		`postgresql.exceptions.ClusterTimeoutError`.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@property</span>
	<span class="nd">@abc.abstractmethod</span>
<div class="viewcode-block" id="Cluster.settings"><a class="viewcode-back" href="../../reference.html#postgresql.api.Cluster.settings">[docs]</a>	<span class="k">def</span> <span class="nf">settings</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		A `Settings` interface to the ``postgresql.conf`` file associated with the</span>
<span class="sd">		cluster.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Start the cluster if it&#39;s not already running, and wait for it to be</span>
<span class="sd">		readied.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abc.abstractmethod</span>
	<span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Stop the cluster and wait for it to shutdown *iff* it was started by the</span>
<span class="sd">		corresponding enter.</span>
<span class="sd">		&quot;&quot;&quot;</span>
</div>
<span class="n">__docformat__</span> <span class="o">=</span> <span class="s">&#39;reStructuredText&#39;</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&#39;__main__&#39;</span><span class="p">:</span>
	<span class="n">help</span><span class="p">(</span><span class="n">__package__</span> <span class="o">+</span> <span class="s">&#39;.api&#39;</span><span class="p">)</span>
<span class="c">##</span>
<span class="c"># vim: ts=3:sw=3:noet:</span>
</pre></div>

          </div>
        </div>
      </div>
      <div class="sphinxsidebar">
        <div class="sphinxsidebarwrapper">
<div id="searchbox" style="display: none">
  <h3>Quick search</h3>
    <form class="search" action="../../search.html" method="get">
      <input type="text" name="q" />
      <input type="submit" value="Go" />
      <input type="hidden" name="check_keywords" value="yes" />
      <input type="hidden" name="area" value="default" />
    </form>
    <p class="searchtip" style="font-size: 90%">
    Enter search terms or a module, class or function name.
    </p>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
        </div>
      </div>
      <div class="clearer"></div>
    </div>
    <div class="related">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../../genindex.html" title="General Index"
             >index</a></li>
        <li class="right" >
          <a href="../../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li><a href="../../index.html">py-postgresql 1.1.0 documentation</a> &raquo;</li>
          <li><a href="../index.html" >Module code</a> &raquo;</li>
          <li><a href="../postgresql.html" >postgresql</a> &raquo;</li> 
      </ul>
    </div>
    <div class="footer">
        &copy; Copyright Python+Postgres.
      Last updated on Jun 12, 2014.
      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.2.
    </div>
  </body>
</html>