146 lines
5.5 KiB
HTML
146 lines
5.5 KiB
HTML
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<link href="../sqlite.css" rel="stylesheet">
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<title>Register A Virtual Table Implementation</title>
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<body>
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<!-- keywords: sqlite3_create_module sqlite3_create_module_v2 -->
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<div class=nosearch>
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Register A Virtual Table Implementation</h2>
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</div>
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<blockquote><pre>
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int sqlite3_create_module(
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sqlite3 *db, /* SQLite connection to register module with */
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const char *zName, /* Name of the module */
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const sqlite3_module *p, /* Methods for the module */
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void *pClientData /* Client data for xCreate/xConnect */
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);
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int sqlite3_create_module_v2(
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sqlite3 *db, /* SQLite connection to register module with */
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const char *zName, /* Name of the module */
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const sqlite3_module *p, /* Methods for the module */
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void *pClientData, /* Client data for xCreate/xConnect */
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void(*xDestroy)(void*) /* Module destructor function */
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);
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</pre></blockquote>
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<p>
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These routines are used to register a new <a href="../c3ref/module.html">virtual table module</a> name.
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Module names must be registered before
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creating a new <a href="../vtab.html">virtual table</a> using the module and before using a
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preexisting <a href="../vtab.html">virtual table</a> for the module.</p>
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<p>The module name is registered on the <a href="../c3ref/sqlite3.html">database connection</a> specified
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by the first parameter. The name of the module is given by the
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second parameter. The third parameter is a pointer to
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the implementation of the <a href="../c3ref/module.html">virtual table module</a>. The fourth
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parameter is an arbitrary client data pointer that is passed through
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into the <a href="../vtab.html#xcreate">xCreate</a> and <a href="../vtab.html#xconnect">xConnect</a> methods of the virtual table module
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when a new virtual table is be being created or reinitialized.</p>
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<p>The sqlite3_create_module_v2() interface has a fifth parameter which
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is a pointer to a destructor for the pClientData. SQLite will
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invoke the destructor function (if it is not NULL) when SQLite
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no longer needs the pClientData pointer. The destructor will also
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be invoked if the call to sqlite3_create_module_v2() fails.
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The sqlite3_create_module()
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interface is equivalent to sqlite3_create_module_v2() with a NULL
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destructor.</p>
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<p>If the third parameter (the pointer to the sqlite3_module object) is
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NULL then no new module is create and any existing modules with the
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same name are dropped.</p>
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<p>See also: <a href="../c3ref/drop_modules.html">sqlite3_drop_modules()</a>
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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