Ignore MySQL foreign key constraints in PHP

Question

Is there a way to override mysql foreign key constraints in a php script?

I have a query passed to mysql from php, but it fails a foreign key constraint, is there any wa

Answer 1

mysql_query('SET foreign_key_checks = 0');
//do some stuff here
mysql_query('SET foreign_key_checks = 1');

Answer 2

I have something like this in my snippet collection:

SET @BACKUP_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS; 
SET @@FOREIGN_KEY_CHECKS=0;

-- Do stuff here

SET @@FOREIGN_KEY_CHECKS=@BACKUP_FOREIGN_KEY_CHECKS;
SET @BACKUP_FOREIGN_KEY_CHECKS=NULL;

Answer 3

You can execute that MySQL query to disable foreign keys check:

SET FOREIGN_KEY_CHECKS=0;

Don't forget to enable it when you're done:

SET FOREIGN_KEY_CHECKS=1;

Answer 4

Run the query: set FOREIGN_KEY_CHECKS=0;

mysql> insert into bar values(1);
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`test`.`bar`, CONSTRAINT `bar_ibfk_1` FOREIGN KEY (`foo_id`) REFERENCES `foo` (`foo_id`) ON UPDATE CASCADE)
mysql> set FOREIGN_KEY_CHECKS=0;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into bar values(1);
Query OK, 1 row affected (0.00 sec)