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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>
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