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+<!-- keywords: sqlite3_trace_v2 -->
+<div class=nosearch>
+<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>
+