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