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<section id="sql-engines">
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<span id="id1"></span><h1>SQL Engines<a class="headerlink" href="#sql-engines" title="Permalink to this heading">¶</a></h1>
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<aside class="sidebar">
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<p class="sidebar-title">further read</p>
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<ul class="simple">
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<li><p><a class="reference external" href="https://www.sqlite.org/index.html">SQLite</a></p></li>
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<li><p><a class="reference external" href="https://www.postgresql.org">PostgreSQL</a></p></li>
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<li><p><a class="reference external" href="https://www.mysql.com">MySQL</a></p></li>
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<li><p><a class="reference internal" href="#extra-dependencies" id="id9">Extra Dependencies</a></p></li>
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<li><p><a class="reference internal" href="#configure-the-engines" id="id10">Configure the engines</a></p>
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<ul>
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<li><p><a class="reference internal" href="#engine-sqlite" id="id11">SQLite</a></p></li>
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<li><p><a class="reference internal" href="#engine-postgresql" id="id12">PostgreSQL</a></p></li>
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<li><p><a class="reference internal" href="#engine-mysql-server" id="id13">MySQL</a></p></li>
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<p class="sidebar-title">info</p>
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<p>Initial sponsored by <a class="reference external" href="https://nlnet.nl/discovery">Search and Discovery Fund</a> of <a class="reference external" href="https://nlnet.nl/">NLnet Foundation</a>.</p>
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</aside>
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<p>With the <em>SQL engines</em> you can bind SQL databases into SearXNG. The following
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Relational Database Management System (RDBMS) are supported:</p>
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<ul class="simple">
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<li><p><a class="reference internal" href="#engine-sqlite"><span class="std std-ref">SQLite</span></a></p></li>
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<li><p><a class="reference internal" href="#engine-postgresql"><span class="std std-ref">PostgreSQL</span></a></p></li>
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<li><p><a class="reference internal" href="#engine-mysql-server"><span class="std std-ref">MySQL</span></a></p></li>
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</ul>
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<p>All of the engines above are just commented out in the <a class="reference external" href="https://github.com/searxng/searxng/blob/master/searx/settings.yml">settings.yml</a>, as you have to set the required attributes for the
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engines, e.g. <code class="docutils literal notranslate"><span class="pre">database:</span></code> …</p>
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<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span>
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<span class="w"> </span><span class="nt">engine</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">{</span><span class="nv">sqlite|postgresql|mysql_server</span><span class="p p-Indicator">}</span>
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<span class="w"> </span><span class="nt">database</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span>
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<span class="w"> </span><span class="nt">result_template</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">{</span><span class="nv">template_name</span><span class="p p-Indicator">}</span>
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<span class="w"> </span><span class="nt">query_str</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span>
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</pre></div>
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</div>
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<p>By default, the engines use the <code class="docutils literal notranslate"><span class="pre">key-value</span></code> template for displaying results /
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see <a class="reference external" href="https://github.com/searxng/searxng/blob/master/searx/templates/simple/result_templates/key-value.html">simple</a>
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theme. If you are not satisfied with the original result layout, you can use
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your own template, set <code class="docutils literal notranslate"><span class="pre">result_template</span></code> attribute to <code class="docutils literal notranslate"><span class="pre">{template_name}</span></code> and
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place the templates at:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">searx</span><span class="o">/</span><span class="n">templates</span><span class="o">/</span><span class="p">{</span><span class="n">theme_name</span><span class="p">}</span><span class="o">/</span><span class="n">result_templates</span><span class="o">/</span><span class="p">{</span><span class="n">template_name</span><span class="p">}</span>
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</pre></div>
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</div>
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<p>If you do not wish to expose these engines on a public instance, you can still
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add them and limit the access by setting <code class="docutils literal notranslate"><span class="pre">tokens</span></code> as described in section
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<a class="reference internal" href="../../../admin/settings/settings_engine.html#private-engines"><span class="std std-ref">Private Engines (tokens)</span></a>.</p>
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<section id="extra-dependencies">
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<h2><a class="toc-backref" href="#id9" role="doc-backlink">Extra Dependencies</a><a class="headerlink" href="#extra-dependencies" title="Permalink to this heading">¶</a></h2>
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<p>For using <a class="reference internal" href="#engine-postgresql"><span class="std std-ref">PostgreSQL</span></a> or <a class="reference internal" href="#engine-mysql-server"><span class="std std-ref">MySQL</span></a> you need to
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install additional packages in Python’s Virtual Environment of your SearXNG
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instance. To switch into the environment (<a class="reference internal" href="../../../admin/installation-searxng.html#searxng-src"><span class="std std-ref">Install SearXNG & dependencies</span></a>) you can use
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<a class="reference internal" href="../../../utils/searxng.sh.html#searxng-sh"><span class="std std-ref">utils/searxng.sh</span></a>:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ sudo utils/searxng.sh instance cmd bash
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(searxng-pyenv)$ pip install ...
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</pre></div>
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</div>
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</section>
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<section id="configure-the-engines">
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<h2><a class="toc-backref" href="#id10" role="doc-backlink">Configure the engines</a><a class="headerlink" href="#configure-the-engines" title="Permalink to this heading">¶</a></h2>
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<p>The configuration of the new database engines are similar. You must put a valid
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SQL-SELECT query in <code class="docutils literal notranslate"><span class="pre">query_str</span></code>. At the moment you can only bind at most one
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parameter in your query. By setting the attribute <code class="docutils literal notranslate"><span class="pre">limit</span></code> you can define how
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many results you want from the SQL server. Basically, it is the same as the
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<code class="docutils literal notranslate"><span class="pre">LIMIT</span></code> keyword in SQL.</p>
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<p>Please, do not include <code class="docutils literal notranslate"><span class="pre">LIMIT</span></code> or <code class="docutils literal notranslate"><span class="pre">OFFSET</span></code> in your SQL query as the engines
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rely on these keywords during paging. If you want to configure the number of
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returned results use the option <code class="docutils literal notranslate"><span class="pre">limit</span></code>.</p>
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<section id="engine-sqlite">
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<span id="id2"></span><h3><a class="toc-backref" href="#id11" role="doc-backlink">SQLite</a><a class="headerlink" href="#engine-sqlite" title="Permalink to this heading">¶</a></h3>
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<aside class="sidebar">
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<p class="sidebar-title">info</p>
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<ul class="simple">
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<li><p><a class="reference external" href="https://github.com/searxng/searxng/blob/master/searx/engines/sqlite.py">sqlite.py</a></p></li>
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</ul>
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</aside>
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<span class="target" id="module-searx.engines.sqlite"></span><p>SQLite is a small, fast and reliable SQL database engine. It does not require
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any extra dependency.</p>
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<section id="example">
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<h4>Example<a class="headerlink" href="#example" title="Permalink to this heading">¶</a></h4>
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<p>To demonstrate the power of database engines, here is a more complex example
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which reads from a <a class="reference external" href="https://mediathekview.de/">MediathekView</a> (DE) movie database. For this example of the
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SQlite engine download the database:</p>
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<ul class="simple">
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<li><p><a class="reference external" href="https://liste.mediathekview.de/filmliste-v2.db.bz2">https://liste.mediathekview.de/filmliste-v2.db.bz2</a></p></li>
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</ul>
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<p>and unpack into <code class="docutils literal notranslate"><span class="pre">searx/data/filmliste-v2.db</span></code>. To search the database use e.g
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Query to test: <code class="docutils literal notranslate"><span class="pre">!mediathekview</span> <span class="pre">concert</span></code></p>
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<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mediathekview</span>
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<span class="w"> </span><span class="nt">engine</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">sqlite</span>
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<span class="w"> </span><span class="nt">disabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">False</span>
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<span class="w"> </span><span class="nt">categories</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">general</span>
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<span class="w"> </span><span class="nt">result_template</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">default.html</span>
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<span class="w"> </span><span class="nt">database</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">searx/data/filmliste-v2.db</span>
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<span class="w"> </span><span class="nt">query_str</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">>-</span>
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<span class="w"> </span><span class="no">SELECT title || ' (' || time(duration, 'unixepoch') || ')' AS title,</span>
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<span class="w"> </span><span class="no">COALESCE( NULLIF(url_video_hd,''), NULLIF(url_video_sd,''), url_video) AS url,</span>
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<span class="w"> </span><span class="no">description AS content</span>
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<span class="w"> </span><span class="no">FROM film</span>
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<span class="w"> </span><span class="no">WHERE title LIKE :wildcard OR description LIKE :wildcard</span>
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<span class="w"> </span><span class="no">ORDER BY duration DESC</span>
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</pre></div>
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</div>
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</section>
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<section id="implementations">
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<h4>Implementations<a class="headerlink" href="#implementations" title="Permalink to this heading">¶</a></h4>
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</section>
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<dl class="py function">
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<dt class="sig sig-object py" id="searx.engines.sqlite.sqlite_cursor">
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<span class="sig-prename descclassname"><span class="pre">searx.engines.sqlite.</span></span><span class="sig-name descname"><span class="pre">sqlite_cursor</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../../../_modules/searx/engines/sqlite.html#sqlite_cursor"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.engines.sqlite.sqlite_cursor" title="Permalink to this definition">¶</a></dt>
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<dd><p>Implements a <a class="reference external" href="https://docs.python.org/3/library/contextlib.html#contextlib.contextmanager" title="(in Python v3.11)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Context</span> <span class="pre">Manager</span></code></a> for a
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<a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Cursor" title="(in Python v3.11)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sqlite3.Cursor</span></code></a>.</p>
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<p>Open database in read only mode: if the database doesn’t exist. The default
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mode creates an empty file on the file system. See:</p>
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<ul class="simple">
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<li><p><a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.connect">https://docs.python.org/3/library/sqlite3.html#sqlite3.connect</a></p></li>
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<li><p><a class="reference external" href="https://www.sqlite.org/uri.html">https://www.sqlite.org/uri.html</a></p></li>
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</ul>
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</dd></dl>
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</section>
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<section id="engine-postgresql">
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<span id="id3"></span><h3><a class="toc-backref" href="#id12" role="doc-backlink">PostgreSQL</a><a class="headerlink" href="#engine-postgresql" title="Permalink to this heading">¶</a></h3>
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<aside class="sidebar">
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<p class="sidebar-title">info</p>
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<ul class="simple">
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<li><p><a class="reference external" href="https://github.com/searxng/searxng/blob/master/searx/engines/postgresql.py">postgresql.py</a></p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">pip</span> <span class="pre">install</span></code> <a class="reference external" href="psycopg2">psycopg2-binary</a></p></li>
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</ul>
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</aside>
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<span class="target" id="module-searx.engines.postgresql"></span><p>PostgreSQL is a powerful and robust open source database. Before configuring
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the PostgreSQL engine, you must install the dependency <code class="docutils literal notranslate"><span class="pre">psychopg2</span></code>.</p>
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<section id="id4">
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<h4>Example<a class="headerlink" href="#id4" title="Permalink to this heading">¶</a></h4>
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<p>Below is an example configuration:</p>
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<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">my_database</span>
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<span class="w"> </span><span class="nt">engine</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">postgresql</span>
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<span class="w"> </span><span class="nt">database</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">my_database</span>
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<span class="w"> </span><span class="nt">username</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">searxng</span>
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<span class="w"> </span><span class="nt">password</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">password</span>
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<span class="w"> </span><span class="nt">query_str</span><span class="p">:</span><span class="w"> </span><span class="s">'SELECT</span><span class="nv"> </span><span class="s">*</span><span class="nv"> </span><span class="s">from</span><span class="nv"> </span><span class="s">my_table</span><span class="nv"> </span><span class="s">WHERE</span><span class="nv"> </span><span class="s">my_column</span><span class="nv"> </span><span class="s">=</span><span class="nv"> </span><span class="s">%(query)s'</span>
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</pre></div>
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</div>
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</section>
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<section id="id5">
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<h4>Implementations<a class="headerlink" href="#id5" title="Permalink to this heading">¶</a></h4>
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</section>
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</section>
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<section id="engine-mysql-server">
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<span id="id6"></span><h3><a class="toc-backref" href="#id13" role="doc-backlink">MySQL</a><a class="headerlink" href="#engine-mysql-server" title="Permalink to this heading">¶</a></h3>
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||
<aside class="sidebar">
|
||
<p class="sidebar-title">info</p>
|
||
<ul class="simple">
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||
<li><p><a class="reference external" href="https://github.com/searxng/searxng/blob/master/searx/engines/mysql_server.py">mysql_server.py</a></p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">pip</span> <span class="pre">install</span></code> <a class="reference external" href="https://pypi.org/project/mysql-connector-python">mysql-connector-python</a></p></li>
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</ul>
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</aside>
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<span class="target" id="module-searx.engines.mysql_server"></span><p>MySQL is said to be the most popular open source database. Before enabling
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MySQL engine, you must install the package <code class="docutils literal notranslate"><span class="pre">mysql-connector-python</span></code>.</p>
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<p>The authentication plugin is configurable by setting <code class="docutils literal notranslate"><span class="pre">auth_plugin</span></code> in the
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attributes. By default it is set to <code class="docutils literal notranslate"><span class="pre">caching_sha2_password</span></code>.</p>
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<section id="id7">
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<h4>Example<a class="headerlink" href="#id7" title="Permalink to this heading">¶</a></h4>
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<p>This is an example configuration for querying a MySQL server:</p>
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<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">my_database</span>
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<span class="w"> </span><span class="nt">engine</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mysql_server</span>
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<span class="w"> </span><span class="nt">database</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">my_database</span>
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<span class="w"> </span><span class="nt">username</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">searxng</span>
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<span class="w"> </span><span class="nt">password</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">password</span>
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<span class="w"> </span><span class="nt">limit</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">5</span>
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<span class="w"> </span><span class="nt">query_str</span><span class="p">:</span><span class="w"> </span><span class="s">'SELECT</span><span class="nv"> </span><span class="s">*</span><span class="nv"> </span><span class="s">from</span><span class="nv"> </span><span class="s">my_table</span><span class="nv"> </span><span class="s">WHERE</span><span class="nv"> </span><span class="s">my_column=%(query)s'</span>
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||
</pre></div>
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</div>
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