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