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<!-- keywords: sqlite3_trace_v2 -->
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<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
<h2>SQL Trace Hook</h2>
</div>
<blockquote><pre>
int sqlite3_trace_v2(
sqlite3*,
unsigned uMask,
int(*xCallback)(unsigned,void*,void*,void*),
void *pCtx
);
</pre></blockquote>
<p>
The sqlite3_trace_v2(D,M,X,P) interface registers a trace callback
function X against <a href="../c3ref/sqlite3.html">database connection</a> D, using property mask M
and context pointer P. If the X callback is
NULL or if the M mask is zero, then tracing is disabled. The
M argument should be the bitwise OR-ed combination of
zero or more <a href="../c3ref/c_trace.html">SQLITE_TRACE</a> constants.</p>
<p>Each call to either sqlite3_trace(D,X,P) or sqlite3_trace_v2(D,M,X,P)
overrides (cancels) all prior calls to sqlite3_trace(D,X,P) or
sqlite3_trace_v2(D,M,X,P) for the <a href="../c3ref/sqlite3.html">database connection</a> D. Each
database connection may have at most one trace callback.</p>
<p>The X callback is invoked whenever any of the events identified by
mask M occur. The integer return value from the callback is currently
ignored, though this may change in future releases. Callback
implementations should return zero to ensure future compatibility.</p>
<p>A trace callback is invoked with four arguments: callback(T,C,P,X).
The T argument is one of the <a href="../c3ref/c_trace.html">SQLITE_TRACE</a>
constants to indicate why the callback was invoked.
The C argument is a copy of the context pointer.
The P and X arguments are pointers whose meanings depend on T.</p>
<p>The sqlite3_trace_v2() interface is intended to replace the legacy
interfaces <a href="../c3ref/profile.html">sqlite3_trace()</a> and <a href="../c3ref/profile.html">sqlite3_profile()</a>, both of which
are deprecated.
</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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