儲存過程封裝了一系列的資料庫操作，這樣既方便了程式中呼叫，也加快了資料庫訪問速度。同時一些簡單的邏輯修改也不用直接修改程式，直接修改儲存過程即可。
create definer=`admin`@`%` procedure `addrankex`(in _gameid varchar(32), in _deviceid varchar(64), in _ip varchar(32), in _level int, in _score int, in _cleartime int)
begin
declare _errcode int default 0;
#發生異常時_errcode置1
declare continue handler for sqlexception set _errcode = 1;#非宣告語句必須放在所有宣告語句的後面，否者會報錯。
start transaction;
#初始化引數
set @deviceid = _deviceid;
set @ip = _ip;
set @level = _level;
set @score = _score;
set @cleartime = _cleartime;
set @sameusercount = 0;
set @currenttime = now();
set @best = 0;
set @current = 0;
set @strsql = concat('select count(*) into @sameusercount from ', _gameid, '_rank where deviceid=@deviceid and level=@level');
prepare stmt from @strsql;
execute stmt;
deallocate prepare stmt;
if @sameusercount > 0 then
#更新set @strsql = concat('update ', _gameid, '_rank set score=@score,cleartime=@cleartime,ip=@ip,time=@currenttime where deviceid=@deviceid and level=@level and score(select score from ', _gameid, '_rank where deviceid=@deviceid and level=@level)');
prepare stmt from @strsql;
execute stmt;
deallocate prepare stmt;
set @strsql = concat('select (count(*) + 1) into @current from ', _gameid, '_rank where deviceid!=@deviceid and level=@level and score>@score');
prepare stmt from @strsql;
execute stmt;
deallocate prepare stmt;
select @current as current,@best as best;
else
rollback;#回滾
select _errcode as errcode;
end if;
end
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