mysql 存储过程

DELIMITER $
drop procedure if exists insert_f_arenarank$
CREATE PROCEDURE `insert_f_arenarank`(in uid varchar(100))
BEGIN
	declare _prep int;
	declare _id int;
	DECLARE t_error INTEGER DEFAULT 0;  
	DECLARE EXIT HANDLER FOR SQLEXCEPTION SET t_error=1;
	start transaction; 
	set _prep = (select id from t_arenarank where next is null);
	insert into t_arenarank (userid,prep) values(uid,_prep);
	set _id = @@IDENTITY;
	update t_arenarank set next = _id where id=_prep;
	if t_error=1 then rollback;
		else commit;
	end if;
END$
DELIMITER ;

DECLARE EXIT HANDLER FOR 1062 Select ‘键值重复‘;
DECLARE EXIT HANDLER FOR SQLEXCEPTION Select ‘SQLException异常‘;
DECLARE EXIT HANDLER FOR SQLSTATE ‘23000‘ Select ‘SQLSTATE 23000‘;