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<section id="sqlite-db">
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<span id="id1"></span><h1>SQLite DB<a class="headerlink" href="#sqlite-db" title="Link to this heading">¶</a></h1>
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<p id="module-searx.sqlitedb">Implementations to make access to SQLite databases a little more convenient.</p>
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<dl class="simple">
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<dt><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl" title="searx.sqlitedb.SQLiteAppl"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLiteAppl</span></code></a></dt><dd><p>Abstract class with which DB applications can be implemented.</p>
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</dd>
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<dt><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties" title="searx.sqlitedb.SQLiteProperties"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLiteProperties</span></code></a>:</dt><dd><p>Class to manage properties stored in a database.</p>
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</dd>
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</dl>
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<p>Examplarical implementations based on <a class="reference internal" href="#searx.sqlitedb.SQLiteAppl" title="searx.sqlitedb.SQLiteAppl"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLiteAppl</span></code></a>:</p>
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<dl class="simple">
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<dt><a class="reference internal" href="searx.cache.html#searx.cache.ExpireCacheSQLite" title="searx.cache.ExpireCacheSQLite"><code class="xref py py-obj docutils literal notranslate"><span class="pre">searx.cache.ExpireCacheSQLite</span></code></a> :</dt><dd><p>Cache that manages key/value pairs in a SQLite DB, in which the key/value
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pairs are deleted after an “expire” time. This type of cache is used, for
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example, for the engines, see <a class="reference internal" href="../dev/engines/enginelib.html#searx.enginelib.EngineCache" title="searx.enginelib.EngineCache"><code class="xref py py-obj docutils literal notranslate"><span class="pre">searx.enginelib.EngineCache</span></code></a>.</p>
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</dd>
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<dt><a class="reference internal" href="searx.favicons.html#searx.favicons.cache.FaviconCacheSQLite" title="searx.favicons.cache.FaviconCacheSQLite"><code class="xref py py-obj docutils literal notranslate"><span class="pre">searx.favicons.cache.FaviconCacheSQLite</span></code></a> :</dt><dd><p>Favicon cache that manages the favicon BLOBs in a SQLite DB.</p>
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</dd>
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</dl>
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<hr class="docutils" />
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<dl class="py class">
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<dt class="sig sig-object py" id="searx.sqlitedb.DBSession">
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<em class="property"><span class="k"><span class="pre">class</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">searx.sqlitedb.</span></span><span class="sig-name descname"><span class="pre">DBSession</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">app</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl" title="searx.sqlitedb.SQLiteAppl"><span class="pre">SQLiteAppl</span></a></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/sqlitedb.html#DBSession"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.DBSession" title="Link to this definition">¶</a></dt>
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<dd><p>A <em>thead-local</em> DB session</p>
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<dl class="py method">
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<dt class="sig sig-object py" id="searx.sqlitedb.DBSession.get_connect">
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<em class="property"><span class="k"><span class="pre">classmethod</span></span><span class="w"> </span></em><span class="sig-name descname"><span class="pre">get_connect</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">app</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl" title="searx.sqlitedb.SQLiteAppl"><span class="pre">SQLiteAppl</span></a></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection" title="(in Python v3.14)"><span class="pre">Connection</span></a></span></span><a class="reference internal" href="../_modules/searx/sqlitedb.html#DBSession.get_connect"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.DBSession.get_connect" title="Link to this definition">¶</a></dt>
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<dd><p>Returns a thread local DB connection. The connection is only
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established once per thread.</p>
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</dd></dl>
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</dd></dl>
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<dl class="py class">
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<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteAppl">
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<em class="property"><span class="k"><span class="pre">class</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">searx.sqlitedb.</span></span><span class="sig-name descname"><span class="pre">SQLiteAppl</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">db_url</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteAppl"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteAppl" title="Link to this definition">¶</a></dt>
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<dd><p>Abstract base class for implementing convenient DB access in SQLite
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applications. In the constructor, a <a class="reference internal" href="#searx.sqlitedb.SQLiteProperties" title="searx.sqlitedb.SQLiteProperties"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLiteProperties</span></code></a> instance is
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already aggregated under <code class="docutils literal notranslate"><span class="pre">self.properties</span></code>.</p>
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<dl class="py attribute">
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<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteAppl.DB_SCHEMA">
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<span class="sig-name descname"><span class="pre">DB_SCHEMA</span></span><em class="property"><span class="p"><span class="pre">:</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.14)"><span class="pre">int</span></a></em><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">1</span></em><a class="headerlink" href="#searx.sqlitedb.SQLiteAppl.DB_SCHEMA" title="Link to this definition">¶</a></dt>
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<dd><p>As soon as changes are made to the DB schema, the version number must be
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increased. Changes to the version number require the DB to be recreated (or
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migrated / if an migration path exists and is implemented).</p>
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</dd></dl>
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<dl class="py attribute">
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<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteAppl.SQLITE_THREADING_MODE">
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<span class="sig-name descname"><span class="pre">SQLITE_THREADING_MODE</span></span><em class="property"><span class="p"><span class="pre">:</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></em><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">'serialized'</span></em><a class="headerlink" href="#searx.sqlitedb.SQLiteAppl.SQLITE_THREADING_MODE" title="Link to this definition">¶</a></dt>
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<dd><p>Threading mode of the SQLite library. Depends on the options used at
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compile time and is different for different distributions and architectures.</p>
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<p>Possible values are 0:<code class="docutils literal notranslate"><span class="pre">single-thread</span></code>, 1:<code class="docutils literal notranslate"><span class="pre">multi-thread</span></code>,
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3:<code class="docutils literal notranslate"><span class="pre">serialized</span></code> (see <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.threadsafety" title="(in Python v3.14)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sqlite3.threadsafety</span></code></a>). Pre- Python 3.11
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this value was hard coded to 1.</p>
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<p>Depending on this value, optimizations are made, e.g. in “serialized” mode
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it is not necessary to create a separate DB connector for each thread.</p>
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</dd></dl>
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<dl class="py attribute">
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<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteAppl.SQLITE_JOURNAL_MODE">
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<span class="sig-name descname"><span class="pre">SQLITE_JOURNAL_MODE</span></span><em class="property"><span class="p"><span class="pre">:</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></em><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">'WAL'</span></em><a class="headerlink" href="#searx.sqlitedb.SQLiteAppl.SQLITE_JOURNAL_MODE" title="Link to this definition">¶</a></dt>
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<dd><p><code class="docutils literal notranslate"><span class="pre">SQLiteAppl</span></code> applications are optimized for <a class="reference external" href="https://sqlite.org/wal.html">WAL</a> mode, its not recommend
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to change the journal mode (see <code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLiteAppl.tear_down</span></code>).</p>
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</dd></dl>
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<dl class="py attribute">
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<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteAppl.SQLITE_CONNECT_ARGS">
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<span class="sig-name descname"><span class="pre">SQLITE_CONNECT_ARGS</span></span><em class="property"><span class="p"><span class="pre">:</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#dict" title="(in Python v3.14)"><span class="pre">dict</span></a><span class="p"><span class="pre">[</span></span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a><span class="p"><span class="pre">,</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.14)"><span class="pre">int</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.14)"><span class="pre">bool</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/constants.html#None" title="(in Python v3.14)"><span class="pre">None</span></a><span class="p"><span class="pre">]</span></span></em><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">{'cached_statements':</span> <span class="pre">0,</span> <span class="pre">'check_same_thread':</span> <span class="pre">False}</span></em><a class="headerlink" href="#searx.sqlitedb.SQLiteAppl.SQLITE_CONNECT_ARGS" title="Link to this definition">¶</a></dt>
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<dd><p>Connection arguments (<a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.connect" title="(in Python v3.14)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sqlite3.connect</span></code></a>)</p>
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<dl>
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<dt><code class="docutils literal notranslate"><span class="pre">check_same_thread</span></code>: <em>bool</em></dt><dd><p>Is disabled by default when <a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.SQLITE_THREADING_MODE" title="searx.sqlitedb.SQLiteAppl.SQLITE_THREADING_MODE"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLITE_THREADING_MODE</span></code></a> is
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<cite>serialized</cite>. The check is more of a hindrance when <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.threadsafety">threadsafety</a> is
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<cite>serialized</cite> because it would prevent a DB connector from being used in
|
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multiple threads.</p>
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<p>Is enabled when <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.threadsafety">threadsafety</a> is <code class="docutils literal notranslate"><span class="pre">single-thread</span></code> or <code class="docutils literal notranslate"><span class="pre">multi-thread</span></code>
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(when threads cannot share a connection <a class="reference external" href="https://peps.python.org/pep-0249/#threadsafety">PEP-0249</a>).</p>
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</dd>
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<dt><code class="docutils literal notranslate"><span class="pre">cached_statements</span></code>:</dt><dd><p>Is set to <code class="docutils literal notranslate"><span class="pre">0</span></code> by default. Note: Python 3.12+ fetch result are not
|
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consistent in multi-threading application and causing an API misuse error.</p>
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<p>The multithreading use in SQLiteAppl is intended and supported if
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threadsafety is set to 3 (aka “serialized”). CPython supports “serialized”
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||
from version 3.12 on, but unfortunately only with errors:</p>
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<ul class="simple">
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<li><p><a class="reference external" href="https://github.com/python/cpython/issues/118172">https://github.com/python/cpython/issues/118172</a></p></li>
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<li><p><a class="reference external" href="https://github.com/python/cpython/issues/123873">https://github.com/python/cpython/issues/123873</a></p></li>
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</ul>
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<p>The workaround for SQLite3 multithreading cache inconsistency is to set
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option <code class="docutils literal notranslate"><span class="pre">cached_statements</span></code> to <code class="docutils literal notranslate"><span class="pre">0</span></code> by default.</p>
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</dd>
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<dt><code class="docutils literal notranslate"><span class="pre">isolation_level</span></code>: <em>unset</em></dt><dd><p>If the connection attribute <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection.isolation_level">isolation_level</a> is <strong>not</strong> <code class="docutils literal notranslate"><span class="pre">None</span></code>, new
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transactions are implicitly opened before <code class="docutils literal notranslate"><span class="pre">execute()</span></code> and
|
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<code class="docutils literal notranslate"><span class="pre">executemany()</span></code> executes SQL- INSERT, UPDATE, DELETE, or REPLACE
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||
statements <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3-transaction-control-isolation-level">[1]</a>.</p>
|
||
<p>By default, the value is not set, which means the default from Python is
|
||
used: Python’s default is <code class="docutils literal notranslate"><span class="pre">""</span></code>, which is an alias for <code class="docutils literal notranslate"><span class="pre">"DEFERRED"</span></code>.</p>
|
||
</dd>
|
||
<dt><code class="docutils literal notranslate"><span class="pre">autocommit</span></code>: <em>unset</em></dt><dd><p>Starting with Python 3.12 the DB connection has a <code class="docutils literal notranslate"><span class="pre">autocommit</span></code> attribute
|
||
and the recommended way of controlling transaction behaviour is through
|
||
this attribute <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#transaction-control-via-the-autocommit-attribute">[2]</a>.</p>
|
||
<p>By default, the value is not set, which means the default from Python is
|
||
used: Python’s default is the constant <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.LEGACY_TRANSACTION_CONTROL">LEGACY_TRANSACTION_CONTROL</a>:
|
||
Pre-Python 3.12 (non-PEP 249-compliant) transaction control, see
|
||
<code class="docutils literal notranslate"><span class="pre">isolation_level</span></code> above for more details.</p>
|
||
</dd>
|
||
</dl>
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</dd></dl>
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<dl class="py method">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteAppl.connect">
|
||
<span class="sig-name descname"><span class="pre">connect</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection" title="(in Python v3.14)"><span class="pre">Connection</span></a></span></span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteAppl.connect"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteAppl.connect" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Creates a new DB connection (<a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.SQLITE_CONNECT_ARGS" title="searx.sqlitedb.SQLiteAppl.SQLITE_CONNECT_ARGS"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLITE_CONNECT_ARGS</span></code></a>). If not
|
||
already done, the DB schema is set up. The caller must take care of
|
||
closing the resource. Alternatively, <a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.DB" title="searx.sqlitedb.SQLiteAppl.DB"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLiteAppl.DB</span></code></a> can also
|
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be used (the resource behind <cite>self.DB</cite> is automatically closed when the
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process or thread is terminated).</p>
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</dd></dl>
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<dl class="py method">
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||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteAppl.register_functions">
|
||
<span class="sig-name descname"><span class="pre">register_functions</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">conn</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection" title="(in Python v3.14)"><span class="pre">Connection</span></a></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteAppl.register_functions"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteAppl.register_functions" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Create <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection.create_function">user-defined</a> SQL functions.</p>
|
||
<dl>
|
||
<dt><code class="docutils literal notranslate"><span class="pre">REGEXP(<pattern>,</span> <span class="pre"><field>)</span></code><span class="classifier">0 | 1</span></dt><dd><p><a class="reference external" href="https://docs.python.org/3/library/re.html#re.search">re.search</a> returns (int) 1 for a match and 0 for none match of
|
||
<code class="docutils literal notranslate"><span class="pre"><pattern></span></code> in <code class="docutils literal notranslate"><span class="pre"><field></span></code>.</p>
|
||
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="s1">'12'</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="n">field</span><span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">REGEXP</span><span class="p">(</span><span class="s1">'^[0-9][0-9]$'</span><span class="p">,</span><span class="w"> </span><span class="n">field</span><span class="p">)</span>
|
||
<span class="c1">-- 12</span>
|
||
|
||
<span class="k">SELECT</span><span class="w"> </span><span class="n">REGEXP</span><span class="p">(</span><span class="s1">'[0-9][0-9]'</span><span class="p">,</span><span class="w"> </span><span class="s1">'X12Y'</span><span class="p">)</span>
|
||
<span class="c1">-- 1</span>
|
||
<span class="k">SELECT</span><span class="w"> </span><span class="n">REGEXP</span><span class="p">(</span><span class="s1">'[0-9][0-9]'</span><span class="p">,</span><span class="w"> </span><span class="s1">'X1Y'</span><span class="p">)</span>
|
||
<span class="c1">-- 0</span>
|
||
</pre></div>
|
||
</div>
|
||
</dd>
|
||
</dl>
|
||
</dd></dl>
|
||
|
||
<dl class="py property">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteAppl.DB">
|
||
<em class="property"><span class="k"><span class="pre">property</span></span><span class="w"> </span></em><span class="sig-name descname"><span class="pre">DB</span></span><em class="property"><span class="p"><span class="pre">:</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection" title="(in Python v3.14)"><span class="pre">Connection</span></a></em><a class="headerlink" href="#searx.sqlitedb.SQLiteAppl.DB" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Provides a DB connection. The connection is a <em>singleton</em> and
|
||
therefore well suited for read access. If
|
||
<a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.SQLITE_THREADING_MODE" title="searx.sqlitedb.SQLiteAppl.SQLITE_THREADING_MODE"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLITE_THREADING_MODE</span></code></a> is <code class="docutils literal notranslate"><span class="pre">serialized</span></code> only one DB connection
|
||
is created for all threads.</p>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>For dedicated <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3-controlling-transactions">transaction control</a>, it is recommended to create a
|
||
new connection (<a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.connect" title="searx.sqlitedb.SQLiteAppl.connect"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLiteAppl.connect</span></code></a>).</p>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
<dl class="py method">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteAppl.init">
|
||
<span class="sig-name descname"><span class="pre">init</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">conn</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection" title="(in Python v3.14)"><span class="pre">Connection</span></a></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.14)"><span class="pre">bool</span></a></span></span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteAppl.init"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteAppl.init" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Initializes the DB schema and properties, is only executed once even
|
||
if called several times.</p>
|
||
<p>If the initialization has not yet taken place, it is carried out and a
|
||
<cite>True</cite> is returned to the caller at the end. If the initialization has
|
||
already been carried out in the past, <cite>False</cite> is returned.</p>
|
||
</dd></dl>
|
||
|
||
</dd></dl>
|
||
|
||
<dl class="py class">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteProperties">
|
||
<em class="property"><span class="k"><span class="pre">class</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">searx.sqlitedb.</span></span><span class="sig-name descname"><span class="pre">SQLiteProperties</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">db_url</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteProperties"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteProperties" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Simple class to manage properties of a DB application in the DB. The
|
||
object has its own DB connection and transaction area.</p>
|
||
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="n">properties</span><span class="w"> </span><span class="p">(</span>
|
||
<span class="w"> </span><span class="n">name</span><span class="w"> </span><span class="nb">TEXT</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="nb">TEXT</span><span class="p">,</span>
|
||
<span class="w"> </span><span class="n">m_time</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="p">(</span><span class="n">strftime</span><span class="p">(</span><span class="s1">'%s'</span><span class="p">,</span><span class="w"> </span><span class="s1">'now'</span><span class="p">)),</span>
|
||
<span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="p">(</span><span class="n">name</span><span class="p">))</span>
|
||
</pre></div>
|
||
</div>
|
||
<dl class="py attribute">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteProperties.SQLITE_JOURNAL_MODE">
|
||
<span class="sig-name descname"><span class="pre">SQLITE_JOURNAL_MODE</span></span><em class="property"><span class="p"><span class="pre">:</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></em><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">'WAL'</span></em><a class="headerlink" href="#searx.sqlitedb.SQLiteProperties.SQLITE_JOURNAL_MODE" title="Link to this definition">¶</a></dt>
|
||
<dd><p><code class="docutils literal notranslate"><span class="pre">SQLiteAppl</span></code> applications are optimized for <a class="reference external" href="https://sqlite.org/wal.html">WAL</a> mode, its not recommend
|
||
to change the journal mode (see <code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLiteAppl.tear_down</span></code>).</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py attribute">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteProperties.DDL_PROPERTIES">
|
||
<span class="sig-name descname"><span class="pre">DDL_PROPERTIES</span></span><em class="property"><span class="p"><span class="pre">:</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></em><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">"CREATE</span> <span class="pre">TABLE</span> <span class="pre">IF</span> <span class="pre">NOT</span> <span class="pre">EXISTS</span> <span class="pre">properties</span> <span class="pre">(\n</span>  <span class="pre">name</span>       <span class="pre">TEXT,\n</span>  <span class="pre">value</span>      <span class="pre">TEXT,\n</span>  <span class="pre">m_time</span>     <span class="pre">INTEGER</span> <span class="pre">DEFAULT</span> <span class="pre">(strftime('%s',</span> <span class="pre">'now')),</span>  <span class="pre">--</span> <span class="pre">last</span> <span class="pre">modified</span> <span class="pre">(unix</span> <span class="pre">epoch)</span> <span class="pre">time</span> <span class="pre">in</span> <span class="pre">sec.\n</span>  <span class="pre">PRIMARY</span> <span class="pre">KEY</span> <span class="pre">(name))"</span></em><a class="headerlink" href="#searx.sqlitedb.SQLiteProperties.DDL_PROPERTIES" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Table to store properties of the DB application</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py attribute">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteProperties.SQLITE_CONNECT_ARGS">
|
||
<span class="sig-name descname"><span class="pre">SQLITE_CONNECT_ARGS</span></span><em class="property"><span class="p"><span class="pre">:</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#dict" title="(in Python v3.14)"><span class="pre">dict</span></a><span class="p"><span class="pre">[</span></span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a><span class="p"><span class="pre">,</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.14)"><span class="pre">int</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.14)"><span class="pre">bool</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/constants.html#None" title="(in Python v3.14)"><span class="pre">None</span></a><span class="p"><span class="pre">]</span></span></em><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">{'cached_statements':</span> <span class="pre">0,</span> <span class="pre">'check_same_thread':</span> <span class="pre">False}</span></em><a class="headerlink" href="#searx.sqlitedb.SQLiteProperties.SQLITE_CONNECT_ARGS" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Connection arguments (<a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.connect" title="(in Python v3.14)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sqlite3.connect</span></code></a>)</p>
|
||
<dl>
|
||
<dt><code class="docutils literal notranslate"><span class="pre">check_same_thread</span></code>: <em>bool</em></dt><dd><p>Is disabled by default when <code class="xref py py-obj docutils literal notranslate"><span class="pre">SQLITE_THREADING_MODE</span></code> is
|
||
<cite>serialized</cite>. The check is more of a hindrance when <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.threadsafety">threadsafety</a> is
|
||
<cite>serialized</cite> because it would prevent a DB connector from being used in
|
||
multiple threads.</p>
|
||
<p>Is enabled when <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.threadsafety">threadsafety</a> is <code class="docutils literal notranslate"><span class="pre">single-thread</span></code> or <code class="docutils literal notranslate"><span class="pre">multi-thread</span></code>
|
||
(when threads cannot share a connection <a class="reference external" href="https://peps.python.org/pep-0249/#threadsafety">PEP-0249</a>).</p>
|
||
</dd>
|
||
<dt><code class="docutils literal notranslate"><span class="pre">cached_statements</span></code>:</dt><dd><p>Is set to <code class="docutils literal notranslate"><span class="pre">0</span></code> by default. Note: Python 3.12+ fetch result are not
|
||
consistent in multi-threading application and causing an API misuse error.</p>
|
||
<p>The multithreading use in SQLiteAppl is intended and supported if
|
||
threadsafety is set to 3 (aka “serialized”). CPython supports “serialized”
|
||
from version 3.12 on, but unfortunately only with errors:</p>
|
||
<ul class="simple">
|
||
<li><p><a class="reference external" href="https://github.com/python/cpython/issues/118172">https://github.com/python/cpython/issues/118172</a></p></li>
|
||
<li><p><a class="reference external" href="https://github.com/python/cpython/issues/123873">https://github.com/python/cpython/issues/123873</a></p></li>
|
||
</ul>
|
||
<p>The workaround for SQLite3 multithreading cache inconsistency is to set
|
||
option <code class="docutils literal notranslate"><span class="pre">cached_statements</span></code> to <code class="docutils literal notranslate"><span class="pre">0</span></code> by default.</p>
|
||
</dd>
|
||
<dt><code class="docutils literal notranslate"><span class="pre">isolation_level</span></code>: <em>unset</em></dt><dd><p>If the connection attribute <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection.isolation_level">isolation_level</a> is <strong>not</strong> <code class="docutils literal notranslate"><span class="pre">None</span></code>, new
|
||
transactions are implicitly opened before <code class="docutils literal notranslate"><span class="pre">execute()</span></code> and
|
||
<code class="docutils literal notranslate"><span class="pre">executemany()</span></code> executes SQL- INSERT, UPDATE, DELETE, or REPLACE
|
||
statements <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3-transaction-control-isolation-level">[1]</a>.</p>
|
||
<p>By default, the value is not set, which means the default from Python is
|
||
used: Python’s default is <code class="docutils literal notranslate"><span class="pre">""</span></code>, which is an alias for <code class="docutils literal notranslate"><span class="pre">"DEFERRED"</span></code>.</p>
|
||
</dd>
|
||
<dt><code class="docutils literal notranslate"><span class="pre">autocommit</span></code>: <em>unset</em></dt><dd><p>Starting with Python 3.12 the DB connection has a <code class="docutils literal notranslate"><span class="pre">autocommit</span></code> attribute
|
||
and the recommended way of controlling transaction behaviour is through
|
||
this attribute <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#transaction-control-via-the-autocommit-attribute">[2]</a>.</p>
|
||
<p>By default, the value is not set, which means the default from Python is
|
||
used: Python’s default is the constant <a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.LEGACY_TRANSACTION_CONTROL">LEGACY_TRANSACTION_CONTROL</a>:
|
||
Pre-Python 3.12 (non-PEP 249-compliant) transaction control, see
|
||
<code class="docutils literal notranslate"><span class="pre">isolation_level</span></code> above for more details.</p>
|
||
</dd>
|
||
</dl>
|
||
</dd></dl>
|
||
|
||
<dl class="py method">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteProperties.init">
|
||
<span class="sig-name descname"><span class="pre">init</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">conn</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection" title="(in Python v3.14)"><span class="pre">Connection</span></a></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.14)"><span class="pre">bool</span></a></span></span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteProperties.init"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteProperties.init" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Initializes DB schema of the properties in the DB.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py method">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteProperties.set">
|
||
<span class="sig-name descname"><span class="pre">set</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">value</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.14)"><span class="pre">int</span></a></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteProperties.set"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteProperties.set" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Set <code class="docutils literal notranslate"><span class="pre">value</span></code> of property <code class="docutils literal notranslate"><span class="pre">name</span></code> in DB. If property already
|
||
exists, update the <code class="docutils literal notranslate"><span class="pre">m_time</span></code> (and the value).</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py method">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteProperties.delete">
|
||
<span class="sig-name descname"><span class="pre">delete</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.14)"><span class="pre">int</span></a></span></span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteProperties.delete"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteProperties.delete" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Delete of property <code class="docutils literal notranslate"><span class="pre">name</span></code> from DB.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py method">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteProperties.row">
|
||
<span class="sig-name descname"><span class="pre">row</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">default</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/typing.html#typing.Any" title="(in Python v3.14)"><span class="pre">Any</span></a></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteProperties.row"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteProperties.row" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Returns the DB row of property <code class="docutils literal notranslate"><span class="pre">name</span></code> or <code class="docutils literal notranslate"><span class="pre">default</span></code> if property
|
||
not exists in DB.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="py method">
|
||
<dt class="sig sig-object py" id="searx.sqlitedb.SQLiteProperties.m_time">
|
||
<span class="sig-name descname"><span class="pre">m_time</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.14)"><span class="pre">str</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">default</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.14)"><span class="pre">int</span></a></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">0</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.14)"><span class="pre">int</span></a></span></span><a class="reference internal" href="../_modules/searx/sqlitedb.html#SQLiteProperties.m_time"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.sqlitedb.SQLiteProperties.m_time" title="Link to this definition">¶</a></dt>
|
||
<dd><p>Last modification time of this property.</p>
|
||
</dd></dl>
|
||
|
||
</dd></dl>
|
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<li class="toctree-l1"><a class="reference internal" href="../user/index.html">User information</a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.DBSession.get_connect"><code class="docutils literal notranslate"><span class="pre">DBSession.get_connect()</span></code></a></li>
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<li class="toctree-l3"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl"><code class="docutils literal notranslate"><span class="pre">SQLiteAppl</span></code></a><ul>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.DB_SCHEMA"><code class="docutils literal notranslate"><span class="pre">SQLiteAppl.DB_SCHEMA</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.SQLITE_THREADING_MODE"><code class="docutils literal notranslate"><span class="pre">SQLiteAppl.SQLITE_THREADING_MODE</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.SQLITE_JOURNAL_MODE"><code class="docutils literal notranslate"><span class="pre">SQLiteAppl.SQLITE_JOURNAL_MODE</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.SQLITE_CONNECT_ARGS"><code class="docutils literal notranslate"><span class="pre">SQLiteAppl.SQLITE_CONNECT_ARGS</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.connect"><code class="docutils literal notranslate"><span class="pre">SQLiteAppl.connect()</span></code></a></li>
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||
<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.register_functions"><code class="docutils literal notranslate"><span class="pre">SQLiteAppl.register_functions()</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.DB"><code class="docutils literal notranslate"><span class="pre">SQLiteAppl.DB</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteAppl.init"><code class="docutils literal notranslate"><span class="pre">SQLiteAppl.init()</span></code></a></li>
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</ul>
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</li>
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<li class="toctree-l3"><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties"><code class="docutils literal notranslate"><span class="pre">SQLiteProperties</span></code></a><ul>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties.SQLITE_JOURNAL_MODE"><code class="docutils literal notranslate"><span class="pre">SQLiteProperties.SQLITE_JOURNAL_MODE</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties.DDL_PROPERTIES"><code class="docutils literal notranslate"><span class="pre">SQLiteProperties.DDL_PROPERTIES</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties.SQLITE_CONNECT_ARGS"><code class="docutils literal notranslate"><span class="pre">SQLiteProperties.SQLITE_CONNECT_ARGS</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties.init"><code class="docutils literal notranslate"><span class="pre">SQLiteProperties.init()</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties.set"><code class="docutils literal notranslate"><span class="pre">SQLiteProperties.set()</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties.delete"><code class="docutils literal notranslate"><span class="pre">SQLiteProperties.delete()</span></code></a></li>
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||
<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties.row"><code class="docutils literal notranslate"><span class="pre">SQLiteProperties.row()</span></code></a></li>
|
||
<li class="toctree-l4"><a class="reference internal" href="#searx.sqlitedb.SQLiteProperties.m_time"><code class="docutils literal notranslate"><span class="pre">SQLiteProperties.m_time()</span></code></a></li>
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