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+<!-- keywords: sqlite3_commit_hook sqlite3_rollback_hook -->
+<div class=nosearch>
+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Commit And Rollback Notification Callbacks</h2>
+</div>
+<blockquote><pre>
+void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*);
+void *sqlite3_rollback_hook(sqlite3*, void(*)(void *), void*);
+</pre></blockquote>
+<p>
+The sqlite3_commit_hook() interface registers a callback
+function to be invoked whenever a transaction is <a href="../lang_transaction.html">committed</a>.
+Any callback set by a previous call to sqlite3_commit_hook()
+for the same database connection is overridden.
+The sqlite3_rollback_hook() interface registers a callback
+function to be invoked whenever a transaction is <a href="../lang_transaction.html">rolled back</a>.
+Any callback set by a previous call to sqlite3_rollback_hook()
+for the same database connection is overridden.
+The pArg argument is passed through to the callback.
+If the callback on a commit hook function returns non-zero,
+then the commit is converted into a rollback.</p>
+
+<p>The sqlite3_commit_hook(D,C,P) and sqlite3_rollback_hook(D,C,P) functions
+return the P argument from the previous call of the same function
+on the same <a href="../c3ref/sqlite3.html">database connection</a> D, or NULL for
+the first call for each function on D.</p>
+
+<p>The commit and rollback hook callbacks are not reentrant.
+The callback implementation must not do anything that will modify
+the database connection that invoked the callback.  Any actions
+to modify the database connection must be deferred until after the
+completion of the <a href="../c3ref/step.html">sqlite3_step()</a> call that triggered the commit
+or rollback hook in the first place.
+Note that running any other SQL statements, including SELECT statements,
+or merely calling <a href="../c3ref/prepare.html">sqlite3_prepare_v2()</a> and <a href="../c3ref/step.html">sqlite3_step()</a> will modify
+the database connections for the meaning of "modify" in this paragraph.</p>
+
+<p>Registering a NULL function disables the callback.</p>
+
+<p>When the commit hook callback routine returns zero, the <a href="../lang_transaction.html">COMMIT</a>
+operation is allowed to continue normally.  If the commit hook
+returns non-zero, then the <a href="../lang_transaction.html">COMMIT</a> is converted into a <a href="../lang_transaction.html">ROLLBACK</a>.
+The rollback hook is invoked on a rollback that results from a commit
+hook returning non-zero, just as it would be with any other rollback.</p>
+
+<p>For the purposes of this API, a transaction is said to have been
+rolled back if an explicit "ROLLBACK" statement is executed, or
+an error or constraint causes an implicit rollback to occur.
+The rollback callback is not invoked if a transaction is
+automatically rolled back because the database connection is closed.</p>
+
+<p>See also the <a href="../c3ref/update_hook.html">sqlite3_update_hook()</a> interface.
+</p><p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+