158 lines
6.0 KiB
HTML
158 lines
6.0 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="../sqlite.css" rel="stylesheet">
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<title>Error Codes And Messages</title>
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<!-- path=../ -->
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</head>
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<body>
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<div class=nosearch>
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<a href="../index.html">
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<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0">
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</a>
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<div class="tagline desktoponly">
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Small. Fast. Reliable.<br>Choose any three.
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<li><a href="../index.html">Home</a>
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</div>
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<!-- keywords: sqlite3_errcode sqlite3_errmsg sqlite3_errmsg16 sqlite3_errstr sqlite3_extended_errcode -->
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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>Error Codes And Messages</h2>
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</div>
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<blockquote><pre>
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int sqlite3_errcode(sqlite3 *db);
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int sqlite3_extended_errcode(sqlite3 *db);
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const char *sqlite3_errmsg(sqlite3*);
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const void *sqlite3_errmsg16(sqlite3*);
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const char *sqlite3_errstr(int);
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</pre></blockquote>
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<p>
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If the most recent sqlite3_* API call associated with
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<a href="../c3ref/sqlite3.html">database connection</a> D failed, then the sqlite3_errcode(D) interface
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returns the numeric <a href="../rescode.html">result code</a> or <a href="../rescode.html#extrc">extended result code</a> for that
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API call.
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The sqlite3_extended_errcode()
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interface is the same except that it always returns the
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<a href="../rescode.html#extrc">extended result code</a> even when extended result codes are
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disabled.</p>
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<p>The values returned by sqlite3_errcode() and/or
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sqlite3_extended_errcode() might change with each API call.
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Except, there are some interfaces that are guaranteed to never
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change the value of the error code. The error-code preserving
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interfaces are:</p>
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<p><ul>
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<li> sqlite3_errcode()
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<li> sqlite3_extended_errcode()
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<li> sqlite3_errmsg()
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<li> sqlite3_errmsg16()
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</ul></p>
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<p>The sqlite3_errmsg() and sqlite3_errmsg16() return English-language
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text that describes the error, as either UTF-8 or UTF-16 respectively.
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Memory to hold the error message string is managed internally.
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The application does not need to worry about freeing the result.
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However, the error string might be overwritten or deallocated by
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subsequent calls to other SQLite interface functions.</p>
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<p>The sqlite3_errstr() interface returns the English-language text
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that describes the <a href="../rescode.html">result code</a>, as UTF-8.
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Memory to hold the error message string is managed internally
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and must not be freed by the application.</p>
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<p>When the serialized <a href="../threadsafe.html">threading mode</a> is in use, it might be the
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case that a second error occurs on a separate thread in between
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the time of the first error and the call to these interfaces.
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When that happens, the second error will be reported since these
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interfaces always report the most recent result. To avoid
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this, each thread can obtain exclusive use of the <a href="../c3ref/sqlite3.html">database connection</a> D
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by invoking <a href="../c3ref/mutex_alloc.html">sqlite3_mutex_enter</a>(<a href="../c3ref/db_mutex.html">sqlite3_db_mutex</a>(D)) before beginning
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to use D and invoking <a href="../c3ref/mutex_alloc.html">sqlite3_mutex_leave</a>(<a href="../c3ref/db_mutex.html">sqlite3_db_mutex</a>(D)) after
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all calls to the interfaces listed here are completed.</p>
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<p>If an interface fails with SQLITE_MISUSE, that means the interface
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was invoked incorrectly by the application. In that case, the
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error code and message may or may not be set.
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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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