存儲過程sql語法錯誤

Question

我數據庫中有5張桌子

ApartamentClass(idclass,descript)
Room(idroom,idclass,beds,isfree)
ItemPrice(iditem,idclass,description,price)
Client(idclient,fio)
Active(idcontract,idclient,idroom,days,price,idclass)

我需要創建一個存儲過程，以檢查是否存在具有某些類(param1)和床位數(param2)免費房間，並為此房天和客戶（fio） (param3)幾天的租用合同(param4) 。 價格取決於房間的等級（較高等級->一張床和一天的較高價格）。

create procedure UserRequest(
    in param1 int,
    in param2 int,
    in param3 varchar(100),
    in param4 int
)
begin   
    declare iroom int default 0;
    select idroom into iroom from room
    where beds = param2 and idclass = param1 and isfree = 0
    limit 1;


    if not (iroom=0) then
        update room set isfree = 1
        where idroom = iroom;
    end if;


    declare iclient int default 0;
    select idclient into iclient from client
    where fio = param3
    limit 1;


    declare bedprice decimal default 0.0;
    select (param2 * price) into bedprice from itemprice
    where description = "bed" and idclass = param1;

    declare dayprice decimal default 0.0;
    select (param4 * price) into dayprice from itemprice
    where description = "day" and idclass = param1;

    declare price decimal default 0.0;
    set price = bedprice + dayprice;


    insert into active(idclient,idroom,days,price,idclass)
    values(iclient,iroom,param4,price,param1);
end

但是我總是得到SQL語法錯誤。 我無法找到問題所在。 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'declare iclient int default 0; select idclient into iclient from client wh' at line 20

Answer 1

如MySQL文檔中所述，所有DECLARE語句必須位於BEGIN ... END塊的開頭： http : //dev.mysql.com/doc/refman/5.0/en/declare.html

僅在BEGIN ... END復合語句中允許使用DECLARE，並且必須在其開始處以及其他任何語句之前。

因此，您可能想嘗試以下代碼：

create procedure UserRequest(
    in param1 int,
    in param2 int,
    in param3 varchar(100),
    in param4 int
)
begin   
    declare iroom int default 0;
    declare iclient int default 0;
    declare bedprice decimal default 0.0;
    declare dayprice decimal default 0.0;
    declare price decimal default 0.0;

    select idroom into iroom from room
    where beds = param2 and idclass = param1 and isfree = 0
    limit 1;


    if not (iroom=0) then
        update room set isfree = 1
        where idroom = iroom;
    end if;


    select idclient into iclient from client
    where fio = param3
    limit 1;

    select (param2 * price) into bedprice from itemprice
    where description = "bed" and idclass = param1;

    select (param4 * price) into dayprice from itemprice
    where description = "day" and idclass = param1;

    set price = bedprice + dayprice;


    insert into active(idclient,idroom,days,price,idclass)
    values(iclient,iroom,param4,price,param1);
end