from http://www.devshed.com/c/a/MySQL/Error-Handling-Examples/ Error Handler Examples Here are some examples of handler declarations: If any error condition arises (other than a NOT FOUND ), continue execution after setting l_error=1 : DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET l_error=1; If any error condition arises (other than a NOT FOUND ), exit the current block or stored program after issuing a ROLLBACK statement and issuing an error message: DECLARE EXIT HANDLER FOR SQLEXCEPTION BEGIN ROLLBACK; SELECT 'Error occurred – terminating'; END; If MySQL error 1062 (duplicate key value) is encountered, continue execution after executing the SELECT statement (which generates a message for the calling program): DECLARE CONTINUE HANDER FOR 106 2 SELECT 'Duplicate key in index'; If SQLSTATE 23000 (duplicate key value) is encountered, continue execution after executing the SELECT statement (which generates a message for the calling program): DECLARE CONTINUE HANDER FOR SQLSTATE '23000' SELECT 'Duplicate key in index'; When a cursor fetch or SQL retrieves no values, continue execution after setting l_done=1 : DECLARE CONTINUE HANDLER FOR NOT FOUND SET l_done=1; Same as the previous example, except specified using a SQLSTATE variable rather than a named condition: DECLARE CONTINUE HANDLER FOR SQLSTATE '02000 ' SET l_done=1; Same as the previous two examples, except specified using a MySQL error code variable rather than a named condition or SQLSTATE variable: DECLARE CONTINUE HANDLER FOR 1329 SET l_done=1; [b]错误处理例子[/b] 有几种错误处理的声明形式： § 如果任何错误（不是 NOT FOUND ） , 设置 l_error 为 1 后继续执行： DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET l_error=1; § 如果发生任何错误（不是 NOT FOUND）， 执行 ROLLBACK和产生一条错误消息后退出当前块或存储过程。 DECLARE EXIT HANDLER FOR SQLEXCEPTION BEGIN ROLLBACK; SELECT 'Error occurred – terminating'; END; § 如果 MySQL 1062错误 (重复的健值 )发生，执行 SELECT语句（向调用程序发一条消息）后继续执行 DECLARE CONTINUE HANDER FOR 106 2 SELECT 'Duplicate key in index'; § 如果 SQLSTATE 2300错误 (重复的健值 )发生，执行 SELECT语句（向调用程序发一条消息）后继续执行 DECLARE CONTINUE HANDER FOR SQLSTATE '23000' SELECT 'Duplicate key in index'; § 当游标或者 SQL 选择语句没有返回值时，设置 l_done=1 后继续执行 DECLARE CONTINUE HANDLER FOR NOT FOUND SET l_done=1; § 此例除了用 SQLSTATE 变量而不是命名条件以外，跟前一个例子一样 DECLARE CONTINUE HANDLER FOR SQLSTATE '02000 ' SET l_done=1; § 此例除了用 MySQL 的错误码变量而不是命名条件或者 SQLSTATE 变量以外，跟前两个例子一样 DECLARE CONTINUE HANDLER FOR 1329 SET l_done=1;