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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Data Change Notification Callbacks</h2><blockquote><pre>void *sqlite3_update_hook(
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void(*)(void *,int ,char const *,char const *,sqlite3_int64),
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</pre></blockquote><p>
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The sqlite3_update_hook() interface registers a callback function
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with the <a href="../c3ref/sqlite3.html">database connection</a> identified by the first argument
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to be invoked whenever a row is updated, inserted or deleted.
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Any callback set by a previous call to this function
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for the same database connection is overridden.</p>
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<p>The second argument is a pointer to the function to invoke when a
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row is updated, inserted or deleted.
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The first argument to the callback is a copy of the third argument
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to sqlite3_update_hook().
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The second callback argument is one of <a href="../c3ref/c_alter_table.html">SQLITE_INSERT</a>, <a href="../c3ref/c_alter_table.html">SQLITE_DELETE</a>,
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or <a href="../c3ref/c_alter_table.html">SQLITE_UPDATE</a>, depending on the operation that caused the callback
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The third and fourth arguments to the callback contain pointers to the
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database and table name containing the affected row.
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The final callback parameter is the <a href="../lang_createtable.html#rowid">rowid</a> of the row.
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In the case of an update, this is the <a href="../lang_createtable.html#rowid">rowid</a> after the update takes place.</p>
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<p>The update hook is not invoked when internal system tables are
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modified (i.e. sqlite_master and sqlite_sequence).</p>
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<p>In the current implementation, the update hook
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is not invoked when duplication rows are deleted because of an
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<a href="../lang_conflict.html">ON CONFLICT REPLACE</a> clause. Nor is the update hook
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invoked when rows are deleted using the <a href="../lang_delete.html#truncateopt">truncate optimization</a>.
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The exceptions defined in this paragraph might change in a future
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release of SQLite.</p>
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<p>The update hook implementation must not do anything that will modify
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the database connection that invoked the update hook. 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 update hook.
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Note that <a href="../c3ref/prepare.html">sqlite3_prepare_v2()</a> and <a href="../c3ref/step.html">sqlite3_step()</a> both modify their
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database connections for the meaning of "modify" in this paragraph.</p>
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<p>The sqlite3_update_hook(D,C,P) function
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returns the P argument from the previous call
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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 on D.</p>
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<p>See also the <a href="../c3ref/commit_hook.html">sqlite3_commit_hook()</a> and <a href="../c3ref/commit_hook.html">sqlite3_rollback_hook()</a>
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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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