161 lines
6.1 KiB
HTML
161 lines
6.1 KiB
HTML
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<!-- keywords: SQLITE_TRACE SQLITE_TRACE_CLOSE SQLITE_TRACE_PROFILE SQLITE_TRACE_ROW SQLITE_TRACE_STMT -->
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>SQL Trace Event Codes</h2>
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</div>
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<blockquote><pre>
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#define SQLITE_TRACE_STMT 0x01
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#define SQLITE_TRACE_PROFILE 0x02
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#define SQLITE_TRACE_ROW 0x04
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#define SQLITE_TRACE_CLOSE 0x08
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</pre></blockquote>
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<p>
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These constants identify classes of events that can be monitored
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using the <a href="../c3ref/trace_v2.html">sqlite3_trace_v2()</a> tracing logic. The M argument
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to <a href="../c3ref/trace_v2.html">sqlite3_trace_v2(D,M,X,P)</a> is an OR-ed combination of one or more of
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the following constants. The first argument to the trace callback
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is one of the following constants.</p>
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<p>New tracing constants may be added in future releases.</p>
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<p>A trace callback has four arguments: xCallback(T,C,P,X).
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The T argument is one of the integer type codes above.
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The C argument is a copy of the context pointer passed in as the
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fourth argument to <a href="../c3ref/trace_v2.html">sqlite3_trace_v2()</a>.
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The P and X arguments are pointers whose meanings depend on T.</p>
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<p><dl>
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<a name="sqlitetracestmt"></a>
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<dt>SQLITE_TRACE_STMT</dt>
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<dd>An SQLITE_TRACE_STMT callback is invoked when a prepared statement
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first begins running and possibly at other times during the
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execution of the prepared statement, such as at the start of each
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trigger subprogram. The P argument is a pointer to the
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<a href="../c3ref/stmt.html">prepared statement</a>. The X argument is a pointer to a string which
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is the unexpanded SQL text of the prepared statement or an SQL comment
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that indicates the invocation of a trigger. The callback can compute
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the same text that would have been returned by the legacy <a href="../c3ref/profile.html">sqlite3_trace()</a>
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interface by using the X argument when X begins with "--" and invoking
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<a href="../c3ref/expanded_sql.html">sqlite3_expanded_sql(P)</a> otherwise.</p>
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<p><a name="sqlitetraceprofile"></a>
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<dt>SQLITE_TRACE_PROFILE</dt>
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<dd>An SQLITE_TRACE_PROFILE callback provides approximately the same
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information as is provided by the <a href="../c3ref/profile.html">sqlite3_profile()</a> callback.
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The P argument is a pointer to the <a href="../c3ref/stmt.html">prepared statement</a> and the
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X argument points to a 64-bit integer which is the estimated of
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the number of nanosecond that the prepared statement took to run.
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The SQLITE_TRACE_PROFILE callback is invoked when the statement finishes.</p>
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<p><a name="sqlitetracerow"></a>
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<dt>SQLITE_TRACE_ROW</dt>
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<dd>An SQLITE_TRACE_ROW callback is invoked whenever a prepared
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statement generates a single row of result.
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The P argument is a pointer to the <a href="../c3ref/stmt.html">prepared statement</a> and the
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X argument is unused.</p>
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<p><a name="sqlitetraceclose"></a>
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<dt>SQLITE_TRACE_CLOSE</dt>
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<dd>An SQLITE_TRACE_CLOSE callback is invoked when a database
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connection closes.
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The P argument is a pointer to the <a href="../c3ref/sqlite3.html">database connection</a> object
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and the X argument is unused.
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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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