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<div class="section" id="id1">
<h1>Persistence<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h1>
<p>RDFLib provides an <a class="reference internal" href="apidocs/rdflib.html#rdflib.store.Store" title="rdflib.store.Store"><tt class="xref py py-class docutils literal"><span class="pre">abstracted</span> <span class="pre">Store</span> <span class="pre">API</span></tt></a>
for persistence of RDF and Notation 3. The
<a class="reference internal" href="apidocs/rdflib.html#rdflib.graph.Graph" title="rdflib.graph.Graph"><tt class="xref py py-class docutils literal"><span class="pre">Graph</span></tt></a> class works with instances of this API
(as the first argument to its constructor) for triple-based management
of an RDF store including: garbage collection, transaction management,
update, pattern matching, removal, length, and database management
(<a class="reference internal" href="apidocs/rdflib.html#rdflib.graph.Graph.open" title="rdflib.graph.Graph.open"><tt class="xref py py-meth docutils literal"><span class="pre">open()</span></tt></a> / <a class="reference internal" href="apidocs/rdflib.html#rdflib.graph.Graph.close" title="rdflib.graph.Graph.close"><tt class="xref py py-meth docutils literal"><span class="pre">close()</span></tt></a>
/ <a class="reference internal" href="apidocs/rdflib.html#rdflib.graph.Graph.destroy" title="rdflib.graph.Graph.destroy"><tt class="xref py py-meth docutils literal"><span class="pre">destroy()</span></tt></a>).</p>
<p>Additional persistence mechanisms can be supported by implementing
this API for a different store.</p>
<div class="section" id="stores-currently-shipped-with-core-rdflib">
<h2>Stores currently shipped with core RDFLib<a class="headerlink" href="#stores-currently-shipped-with-core-rdflib" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><a class="reference internal" href="apidocs/rdflib.plugins.html#rdflib.plugins.memory.IOMemory" title="rdflib.plugins.memory.IOMemory"><tt class="xref py py-class docutils literal"><span class="pre">Memory</span></tt></a> (not persistent!)</li>
<li><a class="reference internal" href="apidocs/rdflib.plugins.html#rdflib.plugins.sleepycat.Sleepycat" title="rdflib.plugins.sleepycat.Sleepycat"><tt class="xref py py-class docutils literal"><span class="pre">Sleepycat</span></tt></a> (on disk persistence via Python’s <em class="xref std std-ref">bsddb</em> or <em class="xref std std-ref">bsddb3</em> packages)</li>
<li><a class="reference internal" href="apidocs/rdflib.plugins.stores.html#rdflib.plugins.stores.sparqlstore.SPARQLStore" title="rdflib.plugins.stores.sparqlstore.SPARQLStore"><tt class="xref py py-class docutils literal"><span class="pre">SPARQLStore</span></tt></a> - a read-only wrapper around a remote SPARQL Query endpoint.</li>
<li><a class="reference internal" href="apidocs/rdflib.plugins.stores.html#rdflib.plugins.stores.sparqlstore.SPARQLUpdateStore" title="rdflib.plugins.stores.sparqlstore.SPARQLUpdateStore"><tt class="xref py py-class docutils literal"><span class="pre">SPARQLUpdateStore</span></tt></a> - a read-write wrapper around a remote SPARQL query/update endpoint pair.</li>
</ul>
</div>
<div class="section" id="usage">
<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>Most cases passing the name of the store to the Graph constructor is enough:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">Graph</span>
<span class="n">graph</span> <span class="o">=</span> <span class="n">Graph</span><span class="p">(</span><span class="n">store</span><span class="o">=</span><span class="s">'Sleepycat'</span><span class="p">)</span>
</pre></div>
</div>
<p>Most store offering on-disk persistence will need to be opened before reading or writing :</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">graph</span> <span class="o">=</span> <span class="n">Graph</span><span class="p">(</span><span class="s">'Sleepycat'</span><span class="p">)</span>
<span class="c"># first time create the store:</span>
<span class="n">graph</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s">'/home/user/data/myRDFLibStore'</span><span class="p">,</span> <span class="n">create</span> <span class="o">=</span> <span class="bp">True</span><span class="p">)</span>
<span class="c"># work with the graph:</span>
<span class="n">graph</span><span class="o">.</span><span class="n">add</span><span class="p">(</span> <span class="n">mytriples</span> <span class="p">)</span>
<span class="c"># when done!</span>
<span class="n">graph</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
</pre></div>
</div>
<p>When done, <a class="reference internal" href="apidocs/rdflib.html#rdflib.graph.Graph.close" title="rdflib.graph.Graph.close"><tt class="xref py py-meth docutils literal"><span class="pre">close()</span></tt></a> must be called to free the resources associated with the store.</p>
</div>
<div class="section" id="additional-store-plugins">
<h2>Additional store plugins<a class="headerlink" href="#additional-store-plugins" title="Permalink to this headline">¶</a></h2>
<p>More store implementations are available in RDFLib extension projects:</p>
<blockquote>
<div><ul class="simple">
<li><a class="reference external" href="https://github.com/RDFLib/rdflib-sqlalchemy">rdflib-sqlalchemy</a>, which supports stored on a wide-variety of RDBMs backends,</li>
<li><a class="reference external" href="https://github.com/RDFLib/rdflib-leveldb">rdflib-leveldb</a> - a store on to of Google’s <a class="reference external" href="https://code.google.com/p/leveldb/">LevelDB</a> key-value store.</li>
<li><a class="reference external" href="https://github.com/RDFLib/rdflib-kyotocabinet">rdflib-kyotocabinet</a> - a store on to of the <a class="reference external" href="http://fallabs.com/kyotocabinet/">Kyoto Cabinet</a> key-value store.</li>
</ul>
</div></blockquote>
</div>
<div class="section" id="example">
<h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><a class="reference internal" href="apidocs/examples.html#module-examples.sleepycat_example" title="examples.sleepycat_example"><tt class="xref py py-mod docutils literal"><span class="pre">examples.sleepycat_example</span></tt></a> contains an example for using a Sleepycat store.</li>
<li><a class="reference internal" href="apidocs/examples.html#module-examples.sparqlstore_example" title="examples.sparqlstore_example"><tt class="xref py py-mod docutils literal"><span class="pre">examples.sparqlstore_example</span></tt></a> contains an example for using a SPARQLStore.</li>
</ul>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Persistence</a><ul>
<li><a class="reference internal" href="#stores-currently-shipped-with-core-rdflib">Stores currently shipped with core RDFLib</a></li>
<li><a class="reference internal" href="#usage">Usage</a></li>
<li><a class="reference internal" href="#additional-store-plugins">Additional store plugins</a></li>
<li><a class="reference internal" href="#example">Example</a></li>
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