SQL Server 存儲過程之嵌套遊標

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USE [NFGC_Workflow]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:Ben.Jiang
-- Create date:2011/9/13
-- Description:添加庫存警告
-- =============================================
ALTER PROCEDURE [dbo].[Insert_AlltblStockLimit]
    @Company NVARCHAR(50),
    @MaxEnable bit,
    @MinEnable bit,
    @Max NVARCHAR(50),
    @Min NVARCHAR(50),
    @MaxAlertAheadDays int,
    @MinAlertAheadDays int
AS
BEGIN
    DECLARE @CustomerCur CURSOR;--聲明外層遊標
    DECLARE @Id NVARCHAR(50),@ItemCode NVARCHAR(50),@customer NVARCHAR(50);
    --獲取所有客戶記錄
    SET @CustomerCur=CURSOR FOR select distinct [cust-num] from(SELECT A.[cust-num],
                                ISNULL(B.name,A.[name]) as name from dbo.Erp_custaddr a
                                 LEFT JOIN dbo.Erp_custaddr_CHS B ON A.[cust-num]=B.[cust-num] AND A.[cust-seq]=B.[cust-seq]
                                 where A.[credit-hold]='False' and A.[cust-seq]=0) as cust

    OPEN @CustomerCur --打開外層遊標
    FETCH NEXT FROM @CustomerCur INTO @customer--提取外層遊標行
    WHILE(@@FETCH_STATUS=0)
    BEGIN

        DECLARE @varCur CURSOR;--聲明內層遊標
        --獲取每一個客戶的商品記錄
        SET @varCur = CURSOR FOR SELECT DISTINCT item FROM dbo.Erp_itemcust AS A INNER JOIN [Erp_ux-customer]
                             AS B ON  A.[cust-num]=B.[cust-num]  AND B.[cust-num] IS NOT NULL   AND LEN(A.[cust-num])>0 AND B.[cust-seq]=0
                             INNER JOIN Erp_imsAs AS C ON C.sItem=A.item AND C.sCust=A.[cust-num]  AND C.cActFlg = '0'
                             WHERE  A.item IS NOT NULL  AND LEN(A.item)>0 AND  A.[cust-num]=@customer;

        OPEN @varCur --打開內層遊標
        FETCH NEXT FROM @varCur INTO @ItemCode
        WHILE(@@FETCH_STATUS=0)
        BEGIN

        IF (exists(SELECT Id from tblStockLimit where Company=@Company and Custnum=@customer and ItemCode=@ItemCode))
            --存在該記錄更新記錄
            BEGIN
            SET @Id=(SELECT Id from tblStockLimit where Company=@Company and Custnum=@customer and ItemCode=@ItemCode)
            update tblStockLimit set MaxEnable=@MaxEnable,Max=case when @Max<>'' then @Max else null end,
            MaxAlertAheadDays=case when @MaxAlertAheadDays<>'' then @MaxAlertAheadDays else null end,
            MinEnable=@MinEnable,Min=case when @Min<>'' then @Min else null end,
            MinAlertAheadDays=case when @MinAlertAheadDays<>'' then @MinAlertAheadDays else null end where Id=@Id;
            END

        ELSE
            --不存在該記錄新增記錄
            BEGIN
            insert into tblStockLimit(Company,Custnum,ItemCode,MaxEnable,Max,MaxAlertAheadDays,MinEnable,Min,MinAlertAheadDays)
            values('NFGS',@customer,@ItemCode,@MaxEnable,case when @Max<>'' then @Max else null end,
            case when @MaxAlertAheadDays<>'' then @MaxAlertAheadDays else null end,@MinEnable,
            case when @Min<>'' then @Min else null end,case when @MinAlertAheadDays<>'' then @MinAlertAheadDays else null end);
            END

        FETCH NEXT FROM @varCur INTO @ItemCode--內層遊標向下移動一行
        END
        CLOSE @varCur
        DEALLOCATE @varCur
        FETCH NEXT FROM @CustomerCur INTO @customer--內層遊標結束後,外層遊標繼續向下移動一行
    END

    CLOSE @CustomerCur
    DEALLOCATE @CustomerCur
END