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MySQL的异常处置剖析以下：
尺度格局
DECLARE handler_type HANDLER FOR condition_value[,...] statement handler_type: CONTINUE | EXIT | UNDO --这个暂时不支撑 condition_value: SQLSTATE [VALUE] sqlstate_value | condition_name | SQLWARNING | NOT FOUND | SQLEXCEPTION | mysql_error_code condition_value细节 DECLA
