mysql 异常处理实例
1. 语法：DECLARE handler_action HANDLERFOR condition_value [, condition_value] …statementhandler_action:CONTINUE| EXIT| UNDOcondition_value:mysql_error_code| SQLSTATE [VALUE] sqlstate_value| condition_name| SQLWARNING| NOT FOUND| SQLEXCEP
1. 语法：DECLARE handler_action HANDLERFOR condition_value [, condition_value] …statementhandler_action:CONTINUE| EXIT| UNDOcondition_value:mysql_error_code| SQLSTATE [VALUE] sqlstate_value| condition_name| SQLWARNING| NOT FOUND| SQLEXCEP