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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Database Connection Configuration Options</h2><blockquote><pre>#define SQLITE_DBCONFIG_LOOKASIDE 1001 /* void* int int */
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#define SQLITE_DBCONFIG_ENABLE_FKEY 1002 /* int int* */
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#define SQLITE_DBCONFIG_ENABLE_TRIGGER 1003 /* int int* */
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</pre></blockquote><p>
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These constants are the available integer configuration options that
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can be passed as the second argument to the <a href="../c3ref/db_config.html">sqlite3_db_config()</a> interface.</p>
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<p>New configuration options may be added in future releases of SQLite.
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Existing configuration options might be discontinued. Applications
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should check the return code from <a href="../c3ref/db_config.html">sqlite3_db_config()</a> to make sure that
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the call worked. The <a href="../c3ref/db_config.html">sqlite3_db_config()</a> interface will return a
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non-zero <a href="../c3ref/c_abort.html">error code</a> if a discontinued or unsupported configuration option
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<dt>SQLITE_DBCONFIG_LOOKASIDE</dt>
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<dd> This option takes three additional arguments that determine the
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<a href="../malloc.html#lookaside">lookaside memory allocator</a> configuration for the <a href="../c3ref/sqlite3.html">database connection</a>.
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The first argument (the third parameter to <a href="../c3ref/db_config.html">sqlite3_db_config()</a> is a
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pointer to a memory buffer to use for lookaside memory.
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The first argument after the SQLITE_DBCONFIG_LOOKASIDE verb
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may be NULL in which case SQLite will allocate the
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lookaside buffer itself using <a href="../c3ref/free.html">sqlite3_malloc()</a>. The second argument is the
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size of each lookaside buffer slot. The third argument is the number of
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slots. The size of the buffer in the first argument must be greater than
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or equal to the product of the second and third arguments. The buffer
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must be aligned to an 8-byte boundary. If the second argument to
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SQLITE_DBCONFIG_LOOKASIDE is not a multiple of 8, it is internally
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rounded down to the next smaller multiple of 8. The lookaside memory
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configuration for a database connection can only be changed when that
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connection is not currently using lookaside memory, or in other words
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when the "current value" returned by
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<a href="../c3ref/db_status.html">sqlite3_db_status</a>(D,<a href="../c3ref/c_config_getmalloc.html#sqliteconfiglookaside">SQLITE_CONFIG_LOOKASIDE</a>,...) is zero.
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Any attempt to change the lookaside memory configuration when lookaside
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memory is in use leaves the configuration unchanged and returns
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<a href="../c3ref/c_abort.html">SQLITE_BUSY</a>.</dd></p>
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<p><dt>SQLITE_DBCONFIG_ENABLE_FKEY</dt>
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<dd> This option is used to enable or disable the enforcement of
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<a href="../foreignkeys.html">foreign key constraints</a>. There should be two additional arguments.
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The first argument is an integer which is 0 to disable FK enforcement,
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positive to enable FK enforcement or negative to leave FK enforcement
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unchanged. The second parameter is a pointer to an integer into which
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is written 0 or 1 to indicate whether FK enforcement is off or on
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following this call. The second parameter may be a NULL pointer, in
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which case the FK enforcement setting is not reported back. </dd></p>
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<p><dt>SQLITE_DBCONFIG_ENABLE_TRIGGER</dt>
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<dd> This option is used to enable or disable <a href="../lang_createtrigger.html">triggers</a>.
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There should be two additional arguments.
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The first argument is an integer which is 0 to disable triggers,
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positive to enable triggers or negative to leave the setting unchanged.
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The second parameter is a pointer to an integer into which
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is written 0 or 1 to indicate whether triggers are disabled or enabled
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following this call. The second parameter may be a NULL pointer, in
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which case the trigger setting is not reported back. </dd></p>
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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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