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