MySql清空所有表数据【慎用】

CREATE PROCEDURE `up_truncate_all_table`()
BEGIN
  DECLARE done INT DEFAULT 0;
  DECLARE tname CHAR(50);
  DECLARE cur1 CURSOR FOR SELECT table_name from INFORMATION_SCHEMA.TABLES WHERE table_schema = 'db_name';
  DECLARE CONTINUE HANDLER FOR SQLSTATE '' SET done = 1;

  OPEN cur1;

  REPEAT
    FETCH cur1 INTO tname;
    IF NOT done THEN
          set  @str=concat('truncate table ', tname);
      prepare stmt1 from @str;
          execute stmt1;
          deallocate prepare stmt1;
    END IF;
  UNTIL done END REPEAT;

  CLOSE cur1;
END