Question

Is it possible to apply trigger for cross database access in MySQL If so please give one example. My purpose is to insert/update/delete data in database2 if there is any new data inserted/updated/deleted in database1. I am using MySQL 5.1

Answer 1

Yes, you can. You could make a procedure and call it in your trigger. Procedure example :

DELIMITER //

CREATE PROCEDURE delete(in table VARCHAR(300), in db VARCHAR(300), in id INT)
BEGIN

set @query0 = CONCAT('DELETE FROM ', new_db, '.', tabela, ' WHERE id=',id);

PREPARE select_query0 FROM @query0;
EXECUTE select_query0;
DEALLOCATE PREPARE select_query0;

END; //

DELIMITER ;

And then to create the trigger:

CREATE TRIGGER del_trigger BEFORE DELETE ON table
  FOR EACH ROW BEGIN
    CALL delete(db, table, OLD.id); 
  END;