mysql动态sql，存储过程动态tablename，存储过程参数为表名

DELIMITER $$
DROP PROCEDURE IF EXISTS `proc`$$
CREATE
PROCEDURE `ondutystatisticdb`.`proc`(tablename VARCHAR(50))
BEGIN

SET @STMT :=CONCAT(" ALTER TABLE ",tablename," DROP PRIMARY KEY;");
PREPARE STMT FROM @STMT;
EXECUTE STMT;

END$$

DELIMITER ;