/usr/lib/ruby/vendor_ruby/sequel/adapters/shared/mysql.rb is in ruby-sequel 4.1.1-1.
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Sequel.require 'adapters/utils/replace'
module Sequel
Dataset::NON_SQL_OPTIONS << :insert_ignore
Dataset::NON_SQL_OPTIONS << :update_ignore
Dataset::NON_SQL_OPTIONS << :on_duplicate_key_update
module MySQL
@convert_tinyint_to_bool = true
class << self
# Sequel converts the column type tinyint(1) to a boolean by default when
# using the native MySQL or Mysql2 adapter. You can turn off the conversion by setting
# this to false. This setting is ignored when connecting to MySQL via the do or jdbc
# adapters, both of which automatically do the conversion.
attr_accessor :convert_tinyint_to_bool
# Set the default charset used for CREATE TABLE. You can pass the
# :charset option to create_table to override this setting.
attr_accessor :default_charset
# Set the default collation used for CREATE TABLE. You can pass the
# :collate option to create_table to override this setting.
attr_accessor :default_collate
# Set the default engine used for CREATE TABLE. You can pass the
# :engine option to create_table to override this setting.
attr_accessor :default_engine
end
# Methods shared by Database instances that connect to MySQL,
# currently supported by the native and JDBC adapters.
module DatabaseMethods
extend Sequel::Database::ResetIdentifierMangling
AUTO_INCREMENT = 'AUTO_INCREMENT'.freeze
CAST_TYPES = {String=>:CHAR, Integer=>:SIGNED, Time=>:DATETIME, DateTime=>:DATETIME, Numeric=>:DECIMAL, BigDecimal=>:DECIMAL, File=>:BINARY}
COLUMN_DEFINITION_ORDER = [:collate, :null, :default, :unique, :primary_key, :auto_increment, :references]
PRIMARY = 'PRIMARY'.freeze
MYSQL_TIMESTAMP_RE = /\ACURRENT_(?:DATE|TIMESTAMP)?\z/
include Sequel::Database::SplitAlterTable
# MySQL's cast rules are restrictive in that you can't just cast to any possible
# database type.
def cast_type_literal(type)
CAST_TYPES[type] || super
end
# Commit an existing prepared transaction with the given transaction
# identifier string.
def commit_prepared_transaction(transaction_id)
run("XA COMMIT #{literal(transaction_id)}")
end
# MySQL uses the :mysql database type
def database_type
:mysql
end
# Use the Information Schema's KEY_COLUMN_USAGE table to get
# basic information on foreign key columns, but include the
# constraint name.
def foreign_key_list(table, opts=OPTS)
m = output_identifier_meth
im = input_identifier_meth
ds = metadata_dataset.
from(:INFORMATION_SCHEMA__KEY_COLUMN_USAGE).
where(:TABLE_NAME=>im.call(table), :TABLE_SCHEMA=>Sequel.function(:DATABASE)).
exclude(:CONSTRAINT_NAME=>'PRIMARY').
exclude(:REFERENCED_TABLE_NAME=>nil).
select(:CONSTRAINT_NAME___name, :COLUMN_NAME___column, :REFERENCED_TABLE_NAME___table, :REFERENCED_COLUMN_NAME___key)
h = {}
ds.each do |row|
if r = h[row[:name]]
r[:columns] << m.call(row[:column])
r[:key] << m.call(row[:key])
else
h[row[:name]] = {:name=>m.call(row[:name]), :columns=>[m.call(row[:column])], :table=>m.call(row[:table]), :key=>[m.call(row[:key])]}
end
end
h.values
end
# MySQL namespaces indexes per table.
def global_index_namespace?
false
end
# Use SHOW INDEX FROM to get the index information for the
# table.
#
# By default partial indexes are not included, you can use the
# option :partial to override this.
def indexes(table, opts=OPTS)
indexes = {}
remove_indexes = []
m = output_identifier_meth
im = input_identifier_meth
metadata_dataset.with_sql("SHOW INDEX FROM ?", SQL::Identifier.new(im.call(table))).each do |r|
name = r[:Key_name]
next if name == PRIMARY
name = m.call(name)
remove_indexes << name if r[:Sub_part] && ! opts[:partial]
i = indexes[name] ||= {:columns=>[], :unique=>r[:Non_unique] != 1}
i[:columns] << m.call(r[:Column_name])
end
indexes.reject{|k,v| remove_indexes.include?(k)}
end
# Rollback an existing prepared transaction with the given transaction
# identifier string.
def rollback_prepared_transaction(transaction_id)
run("XA ROLLBACK #{literal(transaction_id)}")
end
# Get version of MySQL server, used for determined capabilities.
def server_version
@server_version ||= begin
m = /(\d+)\.(\d+)\.(\d+)/.match(get(SQL::Function.new(:version)))
(m[1].to_i * 10000) + (m[2].to_i * 100) + m[3].to_i
end
end
# MySQL supports CREATE TABLE IF NOT EXISTS syntax.
def supports_create_table_if_not_exists?
true
end
# MySQL supports prepared transactions (two-phase commit) using XA
def supports_prepared_transactions?
server_version >= 50000
end
# MySQL supports savepoints
def supports_savepoints?
server_version >= 50000
end
# MySQL doesn't support savepoints inside prepared transactions in from
# 5.5.12 to 5.5.23, see http://bugs.mysql.com/bug.php?id=64374
def supports_savepoints_in_prepared_transactions?
super && (server_version <= 50512 || server_version >= 50523)
end
# MySQL supports transaction isolation levels
def supports_transaction_isolation_levels?
true
end
# Return an array of symbols specifying table names in the current database.
#
# Options:
# * :server - Set the server to use
def tables(opts=OPTS)
full_tables('BASE TABLE', opts)
end
# Changes the database in use by issuing a USE statement. I would be
# very careful if I used this.
def use(db_name)
disconnect
@opts[:database] = db_name if self << "USE #{db_name}"
@schemas = {}
self
end
# Return an array of symbols specifying view names in the current database.
#
# Options:
# * :server - Set the server to use
def views(opts=OPTS)
full_tables('VIEW', opts)
end
private
# Use MySQL specific syntax for some alter table operations.
def alter_table_op_sql(table, op)
case op[:op]
when :add_column
if related = op.delete(:table)
sql = super
op[:table] = related
op[:key] ||= primary_key_from_schema(related)
sql << ", ADD FOREIGN KEY (#{quote_identifier(op[:name])})#{column_references_sql(op)}"
else
super
end
when :rename_column, :set_column_type, :set_column_null, :set_column_default
o = op[:op]
opts = schema(table).find{|x| x.first == op[:name]}
opts = opts ? opts.last.dup : {}
opts[:name] = o == :rename_column ? op[:new_name] : op[:name]
opts[:type] = o == :set_column_type ? op[:type] : opts[:db_type]
opts[:null] = o == :set_column_null ? op[:null] : opts[:allow_null]
opts[:default] = o == :set_column_default ? op[:default] : opts[:ruby_default]
opts.delete(:default) if opts[:default] == nil
opts.delete(:primary_key)
unless op[:type] || opts[:type]
raise Error, "cannot determine database type to use for CHANGE COLUMN operation"
end
opts = op.merge(opts)
opts.delete(:auto_increment) if op[:auto_increment] == false
"CHANGE COLUMN #{quote_identifier(op[:name])} #{column_definition_sql(opts)}"
when :drop_constraint
case op[:type]
when :primary_key
"DROP PRIMARY KEY"
when :foreign_key
name = op[:name] || foreign_key_name(table, op[:columns])
"DROP FOREIGN KEY #{quote_identifier(name)}"
when :unique
"DROP INDEX #{quote_identifier(op[:name])}"
end
when :add_constraint
if op[:type] == :foreign_key
op[:key] ||= primary_key_from_schema(op[:table])
end
super
else
super
end
end
# MySQL server requires table names when dropping indexes.
def alter_table_sql(table, op)
case op[:op]
when :drop_index
"#{drop_index_sql(table, op)} ON #{quote_schema_table(table)}"
when :drop_constraint
if op[:type] == :primary_key
if (pk = primary_key_from_schema(table)).length == 1
return [alter_table_sql(table, {:op=>:rename_column, :name=>pk.first, :new_name=>pk.first, :auto_increment=>false}), super]
end
end
super
else
super
end
end
# Handle MySQL specific default format.
def column_schema_normalize_default(default, type)
if column_schema_default_string_type?(type)
return if [:date, :datetime, :time].include?(type) && MYSQL_TIMESTAMP_RE.match(default)
default = "'#{default.gsub("'", "''").gsub('\\', '\\\\')}'"
end
super(default, type)
end
# Don't allow combining adding foreign key operations with other
# operations, since in some cases adding a foreign key constraint in
# the same query as other operations results in MySQL error 150.
def combinable_alter_table_op?(op)
super && !(op[:op] == :add_constraint && op[:type] == :foreign_key) && !(op[:op] == :drop_constraint && op[:type] == :primary_key)
end
# The SQL queries to execute on initial connection
def mysql_connection_setting_sqls
sqls = []
# Increase timeout so mysql server doesn't disconnect us
# Value used by default is maximum allowed value on Windows.
sqls << "SET @@wait_timeout = #{opts[:timeout] || 2147483}"
# By default, MySQL 'where id is null' selects the last inserted id
sqls << "SET SQL_AUTO_IS_NULL=0" unless opts[:auto_is_null]
# If the user has specified one or more sql modes, enable them
if sql_mode = opts[:sql_mode]
sql_mode = Array(sql_mode).join(',').upcase
sqls << "SET sql_mode = '#{sql_mode}'"
end
sqls
end
# Use MySQL specific AUTO_INCREMENT text.
def auto_increment_sql
AUTO_INCREMENT
end
# MySQL needs to set transaction isolation before begining a transaction
def begin_new_transaction(conn, opts)
set_transaction_isolation(conn, opts)
log_connection_execute(conn, begin_transaction_sql)
end
# Use XA START to start a new prepared transaction if the :prepare
# option is given.
def begin_transaction(conn, opts=OPTS)
if (s = opts[:prepare]) && (th = _trans(conn))[:savepoint_level] == 0
log_connection_execute(conn, "XA START #{literal(s)}")
th[:savepoint_level] += 1
else
super
end
end
# The order of the column definition, as an array of symbols.
def column_definition_order
COLUMN_DEFINITION_ORDER
end
# MySQL doesn't allow default values on text columns, so ignore if it the
# generic text type is used
def column_definition_sql(column)
column.delete(:default) if column[:type] == File || (column[:type] == String && column[:text] == true)
super
end
# Prepare the XA transaction for a two-phase commit if the
# :prepare option is given.
def commit_transaction(conn, opts=OPTS)
if (s = opts[:prepare]) && _trans(conn)[:savepoint_level] <= 1
log_connection_execute(conn, "XA END #{literal(s)}")
log_connection_execute(conn, "XA PREPARE #{literal(s)}")
else
super
end
end
# Use MySQL specific syntax for engine type and character encoding
def create_table_sql(name, generator, options = OPTS)
engine = options.fetch(:engine, Sequel::MySQL.default_engine)
charset = options.fetch(:charset, Sequel::MySQL.default_charset)
collate = options.fetch(:collate, Sequel::MySQL.default_collate)
generator.constraints.sort_by{|c| (c[:type] == :primary_key) ? -1 : 1}
# Proc for figuring out the primary key for a given table.
key_proc = lambda do |t|
if t == name
if pk = generator.primary_key_name
[pk]
elsif !(pkc = generator.constraints.select{|con| con[:type] == :primary_key}).empty?
pkc.first[:columns]
end
else
primary_key_from_schema(t)
end
end
# Manually set the keys, since MySQL requires one, it doesn't use the primary
# key if none are specified.
generator.constraints.each do |c|
if c[:type] == :foreign_key
c[:key] ||= key_proc.call(c[:table])
end
end
# Split column constraints into table constraints in some cases:
# * foreign key - Always
# * unique, primary_key - Only if constraint has a name
generator.columns.each do |c|
if t = c.delete(:table)
same_table = t == name
k = c[:key]
key ||= key_proc.call(t)
if same_table && !k.nil?
generator.constraints.unshift(:type=>:unique, :columns=>Array(k))
end
generator.foreign_key([c[:name]], t, c.merge(:name=>c[:foreign_key_constraint_name], :type=>:foreign_key, :key=>key))
end
end
"#{super}#{" ENGINE=#{engine}" if engine}#{" DEFAULT CHARSET=#{charset}" if charset}#{" DEFAULT COLLATE=#{collate}" if collate}"
end
DATABASE_ERROR_REGEXPS = {
/Duplicate entry .+ for key/ => UniqueConstraintViolation,
/foreign key constraint fails/ => ForeignKeyConstraintViolation,
/cannot be null/ => NotNullConstraintViolation,
/Deadlock found when trying to get lock; try restarting transaction/ => SerializationFailure,
}.freeze
def database_error_regexps
DATABASE_ERROR_REGEXPS
end
# Backbone of the tables and views support using SHOW FULL TABLES.
def full_tables(type, opts)
m = output_identifier_meth
metadata_dataset.with_sql('SHOW FULL TABLES').server(opts[:server]).map{|r| m.call(r.values.first) if r.delete(:Table_type) == type}.compact
end
# MySQL folds unquoted identifiers to lowercase, so it shouldn't need to upcase identifiers on input.
def identifier_input_method_default
nil
end
# MySQL folds unquoted identifiers to lowercase, so it shouldn't need to upcase identifiers on output.
def identifier_output_method_default
nil
end
# Handle MySQL specific index SQL syntax
def index_definition_sql(table_name, index)
index_name = quote_identifier(index[:name] || default_index_name(table_name, index[:columns]))
index_type = case index[:type]
when :full_text
"FULLTEXT "
when :spatial
"SPATIAL "
else
using = " USING #{index[:type]}" unless index[:type] == nil
"UNIQUE " if index[:unique]
end
"CREATE #{index_type}INDEX #{index_name}#{using} ON #{quote_schema_table(table_name)} #{literal(index[:columns])}"
end
# Parse the schema for the given table to get an array of primary key columns
def primary_key_from_schema(table)
schema(table).select{|a| a[1][:primary_key]}.map{|a| a[0]}
end
# Rollback the currently open XA transaction
def rollback_transaction(conn, opts=OPTS)
if (s = opts[:prepare]) && _trans(conn)[:savepoint_level] <= 1
log_connection_execute(conn, "XA END #{literal(s)}")
log_connection_execute(conn, "XA PREPARE #{literal(s)}")
log_connection_execute(conn, "XA ROLLBACK #{literal(s)}")
else
super
end
end
# Recognize MySQL set type.
def schema_column_type(db_type)
case db_type
when /\Aset/io
:set
when /\Amediumint/io
:integer
when /\Amediumtext/io
:string
else
super
end
end
# Use the MySQL specific DESCRIBE syntax to get a table description.
def schema_parse_table(table_name, opts)
m = output_identifier_meth(opts[:dataset])
im = input_identifier_meth(opts[:dataset])
table = SQL::Identifier.new(im.call(table_name))
table = SQL::QualifiedIdentifier.new(im.call(opts[:schema]), table) if opts[:schema]
metadata_dataset.with_sql("DESCRIBE ?", table).map do |row|
row[:auto_increment] = true if row.delete(:Extra).to_s =~ /auto_increment/io
row[:allow_null] = row.delete(:Null) == 'YES'
row[:default] = row.delete(:Default)
row[:primary_key] = row.delete(:Key) == 'PRI'
row[:default] = nil if blank_object?(row[:default])
row[:db_type] = row.delete(:Type)
row[:type] = schema_column_type(row[:db_type])
[m.call(row.delete(:Field)), row]
end
end
# MySQL can combine multiple alter table ops into a single query.
def supports_combining_alter_table_ops?
true
end
# MySQL supports CREATE OR REPLACE VIEW.
def supports_create_or_replace_view?
true
end
# MySQL does not support named column constraints.
def supports_named_column_constraints?
false
end
# Respect the :size option if given to produce
# tinyblob, mediumblob, and longblob if :tiny,
# :medium, or :long is given.
def type_literal_generic_file(column)
case column[:size]
when :tiny # < 2^8 bytes
:tinyblob
when :medium # < 2^24 bytes
:mediumblob
when :long # < 2^32 bytes
:longblob
else # 2^16 bytes
:blob
end
end
# MySQL has both datetime and timestamp classes, most people are going
# to want datetime
def type_literal_generic_datetime(column)
if column[:default] == Sequel::CURRENT_TIMESTAMP
:timestamp
else
:datetime
end
end
# MySQL has both datetime and timestamp classes, most people are going
# to want datetime
def type_literal_generic_time(column)
column[:only_time] ? :time : type_literal_generic_datetime(column)
end
# MySQL doesn't have a true boolean class, so it uses tinyint(1)
def type_literal_generic_trueclass(column)
:'tinyint(1)'
end
end
# Dataset methods shared by datasets that use MySQL databases.
module DatasetMethods
BOOL_TRUE = '1'.freeze
BOOL_FALSE = '0'.freeze
COMMA_SEPARATOR = ', '.freeze
FOR_SHARE = ' LOCK IN SHARE MODE'.freeze
SQL_CALC_FOUND_ROWS = ' SQL_CALC_FOUND_ROWS'.freeze
DELETE_CLAUSE_METHODS = Dataset.clause_methods(:delete, %w'delete from where order limit')
INSERT_CLAUSE_METHODS = Dataset.clause_methods(:insert, %w'insert ignore into columns values on_duplicate_key_update')
SELECT_CLAUSE_METHODS = Dataset.clause_methods(:select, %w'select distinct calc_found_rows columns from join where group having compounds order limit lock')
UPDATE_CLAUSE_METHODS = Dataset.clause_methods(:update, %w'update ignore table set where order limit')
APOS = Dataset::APOS
APOS_RE = Dataset::APOS_RE
DOUBLE_APOS = Dataset::DOUBLE_APOS
SPACE = Dataset::SPACE
PAREN_OPEN = Dataset::PAREN_OPEN
PAREN_CLOSE = Dataset::PAREN_CLOSE
NOT_SPACE = Dataset::NOT_SPACE
FROM = Dataset::FROM
COMMA = Dataset::COMMA
LIMIT = Dataset::LIMIT
GROUP_BY = Dataset::GROUP_BY
ESCAPE = Dataset::ESCAPE
BACKSLASH = Dataset::BACKSLASH
REGEXP = 'REGEXP'.freeze
LIKE = 'LIKE'.freeze
BINARY = 'BINARY '.freeze
CONCAT = "CONCAT".freeze
CAST_BITCOMP_OPEN = "CAST(~".freeze
CAST_BITCOMP_CLOSE = " AS SIGNED INTEGER)".freeze
STRAIGHT_JOIN = 'STRAIGHT_JOIN'.freeze
NATURAL_LEFT_JOIN = 'NATURAL LEFT JOIN'.freeze
BACKTICK = '`'.freeze
BACKTICK_RE = /`/.freeze
DOUBLE_BACKTICK = '``'.freeze
EMPTY_COLUMNS = " ()".freeze
EMPTY_VALUES = " VALUES ()".freeze
IGNORE = " IGNORE".freeze
ON_DUPLICATE_KEY_UPDATE = " ON DUPLICATE KEY UPDATE ".freeze
EQ_VALUES = '=VALUES('.freeze
EQ = '='.freeze
WITH_ROLLUP = ' WITH ROLLUP'.freeze
MATCH_AGAINST = ["(MATCH ".freeze, " AGAINST (".freeze, "))".freeze].freeze
MATCH_AGAINST_BOOLEAN = ["(MATCH ".freeze, " AGAINST (".freeze, " IN BOOLEAN MODE))".freeze].freeze
EXPLAIN = 'EXPLAIN '.freeze
EXPLAIN_EXTENDED = 'EXPLAIN EXTENDED '.freeze
BACKSLASH_RE = /\\/.freeze
QUAD_BACKSLASH = "\\\\\\\\".freeze
BLOB_START = "0x".freeze
HSTAR = "H*".freeze
include Sequel::Dataset::Replace
# MySQL specific syntax for LIKE/REGEXP searches, as well as
# string concatenation.
def complex_expression_sql_append(sql, op, args)
case op
when :IN, :"NOT IN"
ds = args.at(1)
if ds.is_a?(Sequel::Dataset) && ds.opts[:limit]
super(sql, op, [args.at(0), ds.from_self])
else
super
end
when :~, :'!~', :'~*', :'!~*', :LIKE, :'NOT LIKE', :ILIKE, :'NOT ILIKE'
sql << PAREN_OPEN
literal_append(sql, args.at(0))
sql << SPACE
sql << 'NOT ' if [:'NOT LIKE', :'NOT ILIKE', :'!~', :'!~*'].include?(op)
sql << ([:~, :'!~', :'~*', :'!~*'].include?(op) ? REGEXP : LIKE)
sql << SPACE
sql << BINARY if [:~, :'!~', :LIKE, :'NOT LIKE'].include?(op)
literal_append(sql, args.at(1))
if [:LIKE, :'NOT LIKE', :ILIKE, :'NOT ILIKE'].include?(op)
sql << ESCAPE
literal_append(sql, BACKSLASH)
end
sql << PAREN_CLOSE
when :'||'
if args.length > 1
sql << CONCAT
array_sql_append(sql, args)
else
literal_append(sql, args.at(0))
end
when :'B~'
sql << CAST_BITCOMP_OPEN
literal_append(sql, args.at(0))
sql << CAST_BITCOMP_CLOSE
else
super
end
end
# Use GROUP BY instead of DISTINCT ON if arguments are provided.
def distinct(*args)
args.empty? ? super : group(*args)
end
# Sets up the select methods to use SQL_CALC_FOUND_ROWS option.
#
# dataset.calc_found_rows.limit(10)
# # SELECT SQL_CALC_FOUND_ROWS * FROM table LIMIT 10
def calc_found_rows
clone(:calc_found_rows => true)
end
# Return the results of an EXPLAIN query as a string. Options:
# :extended :: Use EXPLAIN EXPTENDED instead of EXPLAIN if true.
def explain(opts=OPTS)
# Load the PrettyTable class, needed for explain output
Sequel.extension(:_pretty_table) unless defined?(Sequel::PrettyTable)
ds = db.send(:metadata_dataset).with_sql((opts[:extended] ? EXPLAIN_EXTENDED : EXPLAIN) + select_sql).naked
rows = ds.all
Sequel::PrettyTable.string(rows, ds.columns)
end
# Return a cloned dataset which will use LOCK IN SHARE MODE to lock returned rows.
def for_share
lock_style(:share)
end
# Adds full text filter
def full_text_search(cols, terms, opts = OPTS)
filter(full_text_sql(cols, terms, opts))
end
# MySQL specific full text search syntax.
def full_text_sql(cols, terms, opts = OPTS)
terms = terms.join(' ') if terms.is_a?(Array)
SQL::PlaceholderLiteralString.new((opts[:boolean] ? MATCH_AGAINST_BOOLEAN : MATCH_AGAINST), [Array(cols), terms])
end
# Transforms an CROSS JOIN to an INNER JOIN if the expr is not nil.
# Raises an error on use of :full_outer type, since MySQL doesn't support it.
def join_table(type, table, expr=nil, opts=OPTS, &block)
type = :inner if (type == :cross) && !expr.nil?
raise(Sequel::Error, "MySQL doesn't support FULL OUTER JOIN") if type == :full_outer
super(type, table, expr, opts, &block)
end
# Transforms :natural_inner to NATURAL LEFT JOIN and straight to
# STRAIGHT_JOIN.
def join_type_sql(join_type)
case join_type
when :straight
STRAIGHT_JOIN
when :natural_inner
NATURAL_LEFT_JOIN
else
super
end
end
# Sets up the insert methods to use INSERT IGNORE.
# Useful if you have a unique key and want to just skip
# inserting rows that violate the unique key restriction.
#
# dataset.insert_ignore.multi_insert(
# [{:name => 'a', :value => 1}, {:name => 'b', :value => 2}]
# )
# # INSERT IGNORE INTO tablename (name, value) VALUES (a, 1), (b, 2)
def insert_ignore
clone(:insert_ignore=>true)
end
# Sets up the insert methods to use ON DUPLICATE KEY UPDATE
# If you pass no arguments, ALL fields will be
# updated with the new values. If you pass the fields you
# want then ONLY those field will be updated.
#
# Useful if you have a unique key and want to update
# inserting rows that violate the unique key restriction.
#
# dataset.on_duplicate_key_update.multi_insert(
# [{:name => 'a', :value => 1}, {:name => 'b', :value => 2}]
# )
# # INSERT INTO tablename (name, value) VALUES (a, 1), (b, 2)
# # ON DUPLICATE KEY UPDATE name=VALUES(name), value=VALUES(value)
#
# dataset.on_duplicate_key_update(:value).multi_insert(
# [{:name => 'a', :value => 1}, {:name => 'b', :value => 2}]
# )
# # INSERT INTO tablename (name, value) VALUES (a, 1), (b, 2)
# # ON DUPLICATE KEY UPDATE value=VALUES(value)
def on_duplicate_key_update(*args)
clone(:on_duplicate_key_update => args)
end
# MySQL specific syntax for inserting multiple values at once.
def multi_insert_sql(columns, values)
sql = LiteralString.new('VALUES ')
expression_list_append(sql, values.map{|r| Array(r)})
[insert_sql(columns, sql)]
end
# MySQL uses the nonstandard ` (backtick) for quoting identifiers.
def quoted_identifier_append(sql, c)
sql << BACKTICK << c.to_s.gsub(BACKTICK_RE, DOUBLE_BACKTICK) << BACKTICK
end
# MySQL can emulate DISTINCT ON with its non-standard GROUP BY implementation,
# though the rows returned cannot be made deterministic through ordering.
def supports_distinct_on?
true
end
# MySQL supports GROUP BY WITH ROLLUP (but not CUBE)
def supports_group_rollup?
true
end
# MySQL does not support INTERSECT or EXCEPT
def supports_intersect_except?
false
end
# MySQL supports modifying joined datasets
def supports_modifying_joins?
true
end
# MySQL's DISTINCT ON emulation using GROUP BY does not respect the
# queries ORDER BY clause.
def supports_ordered_distinct_on?
false
end
# MySQL supports pattern matching via regular expressions
def supports_regexp?
true
end
# MySQL does support fractional timestamps in literal timestamps, but it
# ignores them. Also, using them seems to cause problems on 1.9. Since
# they are ignored anyway, not using them is probably best.
def supports_timestamp_usecs?
false
end
# Sets up the update methods to use UPDATE IGNORE.
# Useful if you have a unique key and want to just skip
# updating rows that violate the unique key restriction.
#
# dataset.update_ignore.update({:name => 'a', :value => 1})
# # UPDATE IGNORE tablename SET name = 'a', value = 1
def update_ignore
clone(:update_ignore=>true)
end
private
# MySQL supports the ORDER BY and LIMIT clauses for DELETE statements
def delete_clause_methods
DELETE_CLAUSE_METHODS
end
# Consider the first table in the joined dataset is the table to delete
# from, but include the others for the purposes of selecting rows.
def delete_from_sql(sql)
if joined_dataset?
sql << SPACE
source_list_append(sql, @opts[:from][0..0])
sql << FROM
source_list_append(sql, @opts[:from])
select_join_sql(sql)
else
super
end
end
# MySQL supports the IGNORE and ON DUPLICATE KEY UPDATE clauses for INSERT statements
def insert_clause_methods
INSERT_CLAUSE_METHODS
end
alias replace_clause_methods insert_clause_methods
# MySQL doesn't use the SQL standard DEFAULT VALUES.
def insert_columns_sql(sql)
values = opts[:values]
if values.is_a?(Array) && values.empty?
sql << EMPTY_COLUMNS
else
super
end
end
# MySQL supports INSERT IGNORE INTO
def insert_ignore_sql(sql)
sql << IGNORE if opts[:insert_ignore]
end
# MySQL supports UPDATE IGNORE
def update_ignore_sql(sql)
sql << IGNORE if opts[:update_ignore]
end
# MySQL supports INSERT ... ON DUPLICATE KEY UPDATE
def insert_on_duplicate_key_update_sql(sql)
if update_cols = opts[:on_duplicate_key_update]
update_vals = nil
if update_cols.empty?
update_cols = columns
elsif update_cols.last.is_a?(Hash)
update_vals = update_cols.last
update_cols = update_cols[0..-2]
end
sql << ON_DUPLICATE_KEY_UPDATE
c = false
co = COMMA
values = EQ_VALUES
endp = PAREN_CLOSE
update_cols.each do |col|
sql << co if c
quote_identifier_append(sql, col)
sql << values
quote_identifier_append(sql, col)
sql << endp
c ||= true
end
if update_vals
eq = EQ
update_vals.map do |col,v|
sql << co if c
quote_identifier_append(sql, col)
sql << eq
literal_append(sql, v)
c ||= true
end
end
end
end
# MySQL doesn't use the standard DEFAULT VALUES for empty values.
def insert_values_sql(sql)
values = opts[:values]
if values.is_a?(Array) && values.empty?
sql << EMPTY_VALUES
else
super
end
end
# MySQL allows a LIMIT in DELETE and UPDATE statements.
def limit_sql(sql)
if l = @opts[:limit]
sql << LIMIT
literal_append(sql, l)
end
end
alias delete_limit_sql limit_sql
alias update_limit_sql limit_sql
# MySQL uses a preceding X for hex escaping strings
def literal_blob_append(sql, v)
sql << BLOB_START << v.unpack(HSTAR).first
end
# Use 0 for false on MySQL
def literal_false
BOOL_FALSE
end
# Raise error for infinitate and NaN values
def literal_float(v)
if v.infinite? || v.nan?
raise InvalidValue, "Infinite floats and NaN values are not valid on MySQL"
else
super
end
end
# SQL fragment for String. Doubles \ and ' by default.
def literal_string_append(sql, v)
sql << APOS << v.gsub(BACKSLASH_RE, QUAD_BACKSLASH).gsub(APOS_RE, DOUBLE_APOS) << APOS
end
# Use 1 for true on MySQL
def literal_true
BOOL_TRUE
end
# MySQL does not support the SQL WITH clause for SELECT statements
def select_clause_methods
SELECT_CLAUSE_METHODS
end
# Support FOR SHARE locking when using the :share lock style.
def select_lock_sql(sql)
@opts[:lock] == :share ? (sql << FOR_SHARE) : super
end
# MySQL specific SQL_CALC_FOUND_ROWS option
def select_calc_found_rows_sql(sql)
sql << SQL_CALC_FOUND_ROWS if opts[:calc_found_rows]
end
# MySQL supports the ORDER BY and LIMIT clauses for UPDATE statements
def update_clause_methods
UPDATE_CLAUSE_METHODS
end
# MySQL uses WITH ROLLUP syntax.
def uses_with_rollup?
true
end
end
end
end
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