Start Updating of new row is not allowed in after trigger

Updating of new row is not allowed in after trigger

Also, if you want to change the NEW values it has to be a BEFORE trigger: CREATE OR REPLACE TRIGGER trig Test BEFORE UPDATE ON table Test FOR EACH ROW BEGIN :new.test_string := 'success'; END trig1; (I can never see the point of using that REFERENCING clause myself.)Try something like this ...

A trigger is a named database object that is associated with a table, and it activates when a particular event (e.g. The statement CREATE TRIGGER creates a new trigger in My SQL.

Here is the syntax : Syntax : Explanation : DEFINER clause : The DEFINER clause specifies the My SQL account to be used when checking access privileges at trigger activation time.

This means each time a DELETE, UPDATE or INSERT is performed, additional actions are taken by the declared triggers. Triggers allow performing an arbitrary transformation of data that is being updated or inserted, or to prevent insert, updated or deletes, or to perform additional operations.

A trigger is a set of actions that are run automatically when a specified change operation (SQL INSERT, UPDATE, or DELETE statement) is performed on a specified table.

FOR EACH ROW means "for each row updated", not for every row in the table whether updated or not! Without FOR EACH ROW, the trigger fires ONCE per update statement.

That's why it can't use the NEW and OLD values, since there may be more than one row affected by the statement.hi, FOR EACH ROW means that the trigger will exectue for each row.

You all posted that I need to use the FOR EACH ROW.