MySql存储过程例子1

delimiter //

drop procedure if exists p_PreLogin//

create procedure p_PreLogin( IN in_username varchar(32), 
							 IN in_password varchar(32), 
							 IN in_asshkey varchar(33),
							 IN in_usshkey varchar(33),
							 IN in_gameid tinyint, 
							 IN in_logintype tinyint
							)
PROC_LABEL: begin
	declare result int default 0;
	declare res_aid int default 0;
	declare res_uid int default 0;
	declare res_srvid int default 0;
	declare res_status tinyint default 0;
	declare res_cnt int default 0;
	declare res_sshkey varchar(33) default NULL;
	
	declare res_ip varchar(16) default NULL;
	declare res_port int default 0;
	
	declare res_out int default 0;
	
	-- 根据 username 和 password 查询出 uid, aid , 找不到返回错误.
	select uid,aid into res_uid,res_aid from tb_user where username = in_username and password = in_password;
	IF coalesce( res_uid, 0 ) = 0 then
		SET res_out = -1;
		select res_out as result;
		LEAVE PROC_LABEL;
	END IF;
	
	-- 平台方判断: 根据 aid 查找 tb_access , 验证信息 status sshkey
	select status,sshkey into res_status,res_sshkey from tb_access where aid = res_aid;
	IF res_status <> 1 then
		SET res_out = -2;
		select res_out as result;
		LEAVE PROC_LABEL;
	END IF;
	
	-- 比较 Server sshkey 
	IF in_asshkey <> res_sshkey then
		SET res_out = -3;
		select res_out as result;
		LEAVE PROC_LABEL;
	END IF;
	
	-- 用户方判断: 判断用户是否有权限参与这个游戏。
	select status into res_status from tb_usergame where aid = res_aid;
	IF coalesce( res_status, 0 ) = 0 then
		SET res_out = -4;
		select res_out as result;
		LEAVE PROC_LABEL;
	END IF;
	
	-- 根据 gameid 和 logintype 查询出 srv_id, IP , Port
	select srv_id,ip,port into res_srvid,res_ip,res_port from tb_allserver where gameid = in_gameid and logintype = in_logintype;
	IF coalesce( res_srvid, 0 ) = 0 then
		SET res_out = -5;
		select res_out as result;
		LEAVE PROC_LABEL;
	END IF;
	
	-- 更新 tb_prelogin 包括status = 1. 登录 lasttime = 最后时间， sshkey = MD5(随机数+lasttime+rid)，srv_id，logintype；
	select count(*) into res_cnt from tb_prelogin where uid = res_uid;
	IF coalesce( res_cnt, 0 ) = 0 then
		insert into tb_prelogin(uid, status, lasttime, sshkey, srv_id, logintype ) values(res_uid, 1, now(), in_usshkey, res_srvid, in_logintype);	
	ELSE
		update tb_prelogin SET status = 1, lasttime = now(), sshkey = in_usshkey, srv_id = res_srvid, logintype = in_logintype where uid = res_uid;
	END IF;
	
	select res_out as err, res_uid as userid, res_port as port, res_ip as ip;
		
	end 
	//
delimiter ;