SQL中循环的实现方式

一、第一种方法，游标

定义游标 DECLARE cur_ClubHeadCash CURSOR FAST_FORWARD READ_ONLY FOR，循环每行 FETCH NEXT FROM cur_ClubHeadCash INTO @intUserID, @Clubid, @Amount

DECLARE @intUserID INT,@Amount INT, @Clubid INT,@AmountTmp INT

DECLARE cur_ClubHeadCash CURSOR FAST_FORWARD READ_ONLY FOR
SELECT userid,cid,cash FROM #temp WHERE userid not in(1000882)  ORDER BY userid ASC

OPEN cur_ClubHeadCash
FETCH NEXT FROM cur_ClubHeadCash INTO @intUserID, @Clubid, @Amount

WHILE @@FETCH_STATUS = 0
BEGIN
    PRINT @intUserID
    PRINT @Clubid
    PRINT @Amount
    
    SET @AmountTmp= @Amount*-1
    PRINT @AmountTmp
    
    --EXEC dbo.PrPsWeb_UpdateClubCash 
    --                @Clubid,
    --                13001,
    --                @AmountTmp,
    --                '127.0.0.1',
    --                '管理员减少房卡',
    --                NULL,
    --                0
        
    --EXEC dbo.PrPsWeb_UpdateUserCash
    --            @intUserID,
    --            13000,
    --            @Amount,
    --            '127.0.0.1',
    --            '管理员增加金币',
    --            NULL,
    --            0        
                
    FETCH NEXT FROM cur_ClubHeadCash INTO @intUserID,@Clubid,@Amount
    
END

CLOSE cur_ClubHeadCash
DEALLOCATE cur_ClubHeadCash

DROP TABLE #temp

二、第二种方法，while循环

获取需处理表的所有行以及行号，取最小行号min和最大行号max，进行循环

DECLARE @intMinId INT,@intMaxId INT,@intClubID INT,@lngUpdateAmount BIGINT

SELECT RowID=IDENTITY(INT,1,1),A.ClubID,A.NeedAmount
INTO #templist 
FROM Game.UserCreateClubDesk AS A WHERE A.ServerID=@intServerID

SELECT @intMinId =MIN(RowID),@intMaxId=MAX(RowID) 
FROM #templist

WHILE @intMinId<=@intMaxId
BEGIN
    SELECT @intClubID=ClubID,@lngUpdateAmount=NeedAmount 
    FROM #templist WHERE RowID=@intMinId
    EXEC dbo.PrPsWeb_UpdateClubCash 
                @intClubID,
                @sintSourceType,
                @lngUpdateAmount,
                '127.0.0.1',
                @chvMemo,
                NULL,
                0
    SET @intMinId=@intMinId+1
END
DROP TABLE #templist