143 lines
5.2 KiB
HTML
143 lines
5.2 KiB
HTML
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<link href="../sqlite.css" rel="stylesheet">
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<title>Prepare Flags</title>
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<!-- keywords: SQLITE_PREPARE_NORMALIZE SQLITE_PREPARE_NO_VTAB SQLITE_PREPARE_PERSISTENT -->
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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>Prepare Flags</h2>
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</div>
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<blockquote><pre>
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#define SQLITE_PREPARE_PERSISTENT 0x01
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#define SQLITE_PREPARE_NORMALIZE 0x02
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#define SQLITE_PREPARE_NO_VTAB 0x04
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</pre></blockquote>
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<p>
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These constants define various flags that can be passed into
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"prepFlags" parameter of the <a href="../c3ref/prepare.html">sqlite3_prepare_v3()</a> and
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<a href="../c3ref/prepare.html">sqlite3_prepare16_v3()</a> interfaces.</p>
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<p>New flags may be added in future releases of SQLite.</p>
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<p><dl>
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<a name="sqlitepreparepersistent"></a>
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<dt>SQLITE_PREPARE_PERSISTENT</dt>
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<dd>The SQLITE_PREPARE_PERSISTENT flag is a hint to the query planner
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that the prepared statement will be retained for a long time and
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probably reused many times. Without this flag, <a href="../c3ref/prepare.html">sqlite3_prepare_v3()</a>
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and <a href="../c3ref/prepare.html">sqlite3_prepare16_v3()</a> assume that the prepared statement will
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be used just once or at most a few times and then destroyed using
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<a href="../c3ref/finalize.html">sqlite3_finalize()</a> relatively soon. The current implementation acts
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on this hint by avoiding the use of <a href="../malloc.html#lookaside">lookaside memory</a> so as not to
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deplete the limited store of lookaside memory. Future versions of
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SQLite may act on this hint differently.</p>
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<p><a name="sqlitepreparenormalize"></a>
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<dt>SQLITE_PREPARE_NORMALIZE</dt>
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<dd>The SQLITE_PREPARE_NORMALIZE flag is a no-op. This flag used
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to be required for any prepared statement that wanted to use the
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<a href="../c3ref/expanded_sql.html">sqlite3_normalized_sql()</a> interface. However, the
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<a href="../c3ref/expanded_sql.html">sqlite3_normalized_sql()</a> interface is now available to all
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prepared statements, regardless of whether or not they use this
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flag.</p>
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<p><a name="sqlitepreparenovtab"></a>
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<dt>SQLITE_PREPARE_NO_VTAB</dt>
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<dd>The SQLITE_PREPARE_NO_VTAB flag causes the SQL compiler
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to return an error (error code SQLITE_ERROR) if the statement uses
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any virtual tables.
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</dl>
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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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