这是我项目当中用到的，用作参考使用：

DELIMITER $$
DROP PROCEDURE IF EXISTS `gpsdata`.`sp_test`$$
CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_test`(
	gpstime_ varchar(128),
	gpsname_ varchar(128),
	gpsinfo_ varchar(256)
)
BEGIN
DECLARE tbname varchar(50) DEFAULT  '0';
DECLARE v_sql varchar(1024) DEFAULT '0';

SET v_sql=CONCAT('select * from  ', tbname ,' where gpsname = ',gpsname_,'  order by gpstime desc limit 1');


SET @lastdata = v_sql;
PREPARE lastdata FROM @lastdata;   
EXECUTE lastdata;
DEALLOCATE PREPARE lastdata;  

select v_sql;

END$$

DELIMITER ;