Mysql动态SQL语句

示例1：
调用语句call agm('a3 desc',0,5)

CREATE PROCEDURE `agm`(IN order_param varchar(10),IN anchor int,IN size int)
BEGIN
	set @s = concat("select * from test1 order by ",order_param," limit ",anchor,",",size);
	prepare stmt from @s;
	execute stmt;
	DEALLOCATE prepare stmt;
END

示例2：
调用语句call agm1('a3 desc',0,5)

CREATE PROCEDURE `agm1`(IN order_param varchar(10),IN anchor int,IN size int)
BEGIN
	set @s = "select * from ag_tag order by ? limit ?,?";
	prepare stmt from @s;
	set @a=order_param;
	set @b=anchor;
	set @c=size;
	execute stmt USING @a,@b,@c;
	DEALLOCATE prepare stmt;
END