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2019-06-20 22:21:48 +08:00

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title>Welcome to python-rocksdb’s documentation! &#8212; python-rocksdb 0.6.7 documentation</title>
<link rel="stylesheet" href="_static/alabaster.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<script type="text/javascript" id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></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>
<script type="text/javascript" src="_static/language_data.js"></script>
<link rel="index" title="Index" href="genindex.html" />
<link rel="search" title="Search" href="search.html" />
<link rel="next" title="Installing" href="installation.html" />
<link rel="stylesheet" href="_static/custom.css" type="text/css" />
<meta name="viewport" content="width=device-width, initial-scale=0.9, maximum-scale=0.9" />
</head><body>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body" role="main">
<div class="section" id="welcome-to-python-rocksdb-s-documentation">
<h1>Welcome to python-rocksdb’s documentation!<a class="headerlink" href="#welcome-to-python-rocksdb-s-documentation" title="Permalink to this headline"></a></h1>
<div class="section" id="overview">
<h2>Overview<a class="headerlink" href="#overview" title="Permalink to this headline"></a></h2>
<p>Python bindings to the C++ interface of <a class="reference external" href="http://rocksdb.org/">http://rocksdb.org/</a> using pybind11:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">pyrocksdb</span>
<span class="n">db</span> <span class="o">=</span> <span class="n">pyrocksdb</span><span class="o">.</span><span class="n">DB</span><span class="p">()</span>
<span class="n">opts</span> <span class="o">=</span> <span class="n">pyrocksdb</span><span class="o">.</span><span class="n">Options</span><span class="p">()</span>
<span class="c1"># for multi-thread</span>
<span class="n">opts</span><span class="o">.</span><span class="n">IncreaseParallelism</span><span class="p">()</span>
<span class="n">opts</span><span class="o">.</span><span class="n">OptimizeLevelStyleCompaction</span><span class="p">()</span>
<span class="n">opts</span><span class="o">.</span><span class="n">create_if_missing</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">opts</span><span class="p">,</span> <span class="s1">&#39;/path/to/db&#39;</span><span class="p">)</span>
<span class="k">assert</span><span class="p">(</span><span class="n">s</span><span class="o">.</span><span class="n">ok</span><span class="p">())</span>
<span class="c1"># put</span>
<span class="n">opts</span> <span class="o">=</span> <span class="n">pyrocksdb</span><span class="o">.</span><span class="n">WriteOptions</span><span class="p">()</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">put</span><span class="p">(</span><span class="n">opts</span><span class="p">,</span> <span class="sa">b</span><span class="s2">&quot;key1&quot;</span><span class="p">,</span> <span class="sa">b</span><span class="s2">&quot;value1&quot;</span><span class="p">)</span>
<span class="k">assert</span> <span class="p">(</span><span class="n">s</span><span class="o">.</span><span class="n">ok</span><span class="p">())</span>
<span class="c1"># get</span>
<span class="n">opts</span> <span class="o">=</span> <span class="n">pyrocksdb</span><span class="o">.</span><span class="n">ReadOptions</span><span class="p">()</span>
<span class="n">blob</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">opts</span><span class="p">,</span> <span class="sa">b</span><span class="s2">&quot;key1&quot;</span><span class="p">)</span>
<span class="nb">print</span> <span class="p">(</span><span class="n">blob</span><span class="o">.</span><span class="n">data</span><span class="p">)</span> <span class="c1"># b&quot;value1&quot;</span>
<span class="nb">print</span> <span class="p">(</span><span class="n">blob</span><span class="o">.</span><span class="n">status</span><span class="o">.</span><span class="n">ok</span><span class="p">())</span> <span class="c1"># true</span>
<span class="c1">#delete</span>
<span class="n">opts</span> <span class="o">=</span> <span class="n">pyrocksdb</span><span class="o">.</span><span class="n">WriteOptions</span><span class="p">()</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span><span class="n">opts</span><span class="p">,</span> <span class="sa">b</span><span class="s2">&quot;key1&quot;</span><span class="p">)</span>
<span class="k">assert</span><span class="p">(</span><span class="n">s</span><span class="o">.</span><span class="n">ok</span><span class="p">())</span>
<span class="n">db</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
</pre></div>
</div>
<p>Tested with python3.7</p>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="installation.html">Instructions how to install</a><ul>
<li class="toctree-l2"><a class="reference internal" href="installation.html#from-source">From source</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="tutorial/index.html">Tutorial</a><ul>
<li class="toctree-l2"><a class="reference internal" href="tutorial/index.html#column-family">Column Family</a></li>
<li class="toctree-l2"><a class="reference internal" href="tutorial/index.html#wrtie-batch">Wrtie Batch</a></li>
<li class="toctree-l2"><a class="reference internal" href="tutorial/index.html#iteration">Iteration</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="changelog.html">Changelog</a><ul>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-5">Version 0.5</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-4">Version 0.4</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-3">Version 0.3</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-2">Version 0.2</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-1">Version 0.1</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="section" id="contributing">
<h2>Contributing<a class="headerlink" href="#contributing" title="Permalink to this headline"></a></h2>
<p>Source can be found on <a class="reference external" href="https://github.com/twmht/python-rocksdb/tree/pybind11">github</a>.
Feel free to fork and send pull-requests or create issues on the
<a class="reference external" href="https://github.com/twmht/python-rocksdb/issues">github issue tracker</a></p>
</div>
</div>
<div class="section" id="indices-and-tables">
<h1>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Permalink to this headline"></a></h1>
<ul class="simple">
<li><p><a class="reference internal" href="genindex.html"><span class="std std-ref">Index</span></a></p></li>
<li><p><a class="reference internal" href="py-modindex.html"><span class="std std-ref">Module Index</span></a></p></li>
<li><p><a class="reference internal" href="search.html"><span class="std std-ref">Search Page</span></a></p></li>
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<h1 class="logo"><a href="#">python-rocksdb</a></h1>
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<li class="toctree-l1"><a class="reference internal" href="installation.html">Instructions how to install</a></li>
<li class="toctree-l1"><a class="reference internal" href="tutorial/index.html">Tutorial</a></li>
<li class="toctree-l1"><a class="reference internal" href="changelog.html">Changelog</a></li>
</ul>
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<h3>Related Topics</h3>
<ul>
<li><a href="#">Documentation overview</a><ul>
<li>Next: <a href="installation.html" title="next chapter">Installing</a></li>
</ul></li>
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