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Re: Trigger for read-only column
Posted by: Fitsum Tesfagiorgis
Date: June 12, 2013 01:57PM

Thanks Peter it's working now! But I can not update any of the fields. I want only the client_id to be locked.

mysql> delimiter //
mysql> CREATE TRIGGER client_id_lock BEFORE UPDATE ON users_column_lock
-> FOR EACH ROW
-> BEGIN
-> IF OLD.client_id THEN SIGNAL SQLSTATE '45000'
-> SET
-> MESSAGE_TEXT = 'Cannot update locked record';
-> END IF;
-> END;//
Query OK, 0 rows affected (0.11 sec)

update users_column_lock set client_id=20 where users_id=521;
ERROR 1644 (45000): Cannot update locked record

mysql> update users_column_lock set first_name='Fitsum' where users_id=521;
ERROR 1644 (45000): Cannot update locked record



Edited 2 time(s). Last edit at 06/12/2013 02:25PM by Fitsum Tesfagiorgis.

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