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## SQLite C Interface

### Data Change Notification Callbacks

>     void *sqlite3_update_hook(
>       sqlite3*,
>       void(*)(void *,int ,char const *,char const *,sqlite3_int64),
>       void*
>     );

Register a callback function with the database connection identified by the first argument to be invoked whenever a row is updated, inserted or deleted. Any callback set by a previous call to this function for the same database connection is overridden.

The second argument is a pointer to the function to invoke when a row is updated, inserted or deleted. The first argument to the callback is a copy of the third argument to sqlite3_update_hook(). The second callback argument is one of SQLITE_INSERT, SQLITE_DELETE or SQLITE_UPDATE, depending on the operation that caused the callback to be invoked. The third and fourth arguments to the callback contain pointers to the database and table name containing the affected row. The final callback parameter is the rowid of the row. In the case of an update, this is the rowid after the update takes place.

The update hook is not invoked when internal system tables are modified (i.e. sqlite_master and sqlite_sequence).

If another function was previously registered, its pArg value is returned. Otherwise NULL is returned.

See also lists of Objects, Constants, and Functions.

This page last modified 2007/11/22 00:41:31 UTC