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;

错误处理例子

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;