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MySQL database transaction, using the WordPress database object $wpdb. When you render a page in WordPress (front end or admin area), the $wpdb database object has already been initialised and opened up a connection to the database. Therefore we can recycle this database connection for our own needs. The $wpdb object saves the database handle as…
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| <?php | |
| global $wpdb; | |
| // @ prefix used to suppress errors, but you should do your own | |
| // error checking by checking return values from each mysql_query() | |
| // Start Transaction | |
| @mysql_query("BEGIN", $wpdb->dbh); | |
| // Do some expensive/related queries here | |
| $wpdb->query("DELETE FROM table WHERE form_id = '1' "); | |
| $wpdb->query("DELETE FROM data WHERE form_id = '1' "); | |
| if ($error) { | |
| // Error occured, don't save any changes | |
| @mysql_query("ROLLBACK", $wpdb->dbh); | |
| } else { | |
| // All ok, save the changes | |
| @mysql_query("COMMIT", $wpdb->dbh); | |
| } | |
| ?> |
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