一个Sql Server 的游标与循环嵌套的存储过程用例

一个Sql Server 的游标与循环嵌套的存储过程用例

准备代码

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--创建表
CREATE TABLE everyoneAVG
(
    ID int primary key identity(1,1),
    AccNo INT,
    AVGTime INT,
    AddTimes INT
);

DROP TABLE everyoneAVG;

SELECT ID,AccNo AS '用户号',AVGTime/60 AS '平均充值时间间隔(小时)',AddTimes AS '总充值次数' 
FROM everyoneAVG
ORDER BY AVGTime/60 DESC;

DELETE everyoneAVG;

功能需求

查询出一个时间段内每个人的平均充值时间间隔

实现代码

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CREATE PROCEDURE P_getAVGAddTime

AS
BEGIN
DECLARE
    @AccountNo INT, --账户号

    @AVGTime INT,   --每个人平均充值间隔时间(分钟)
    @AddTimes INT,  --每个人总充值次数（忽略十分钟内的充值）
    @upConsumeTime DATETIME,    --前一次成交时间
    @ConsumeTime DATETIME,  --当前成交时间
    @TempTime INT   --临时记录累加的间隔时间(分钟)

    --声明用户号游标
    DECLARE allAcc_cursor CURSOR FOR
    SELECT top 99.9999 percent AccountNo 
    FROM [CASH].[dbo].[tb_Customer]
    ORDER BY AccountNo

    OPEN allAcc_cursor  --打开游标
    FETCH NEXT FROM allAcc_cursor   --获取游标下一行数据
    INTO @AccountNo --使变量获取当前游标指定行的账户号

    -----------外部游标，ORDER BY AccountNo
    WHILE(@@FETCH_STATUS=0)
    BEGIN

        SET @TempTime=0
        SET @AVGTime=0  --每个人平均充值时间赋初值
        SET @AddTimes=0 --每个人充值次数赋初值
        SET @upConsumeTime='2017-11-09 00:00:00.000'

        DECLARE ConsumeTime_Cursor CURSOR FOR   --声明成交时间

        --充值记录查询
        SELECT top 99.9999 percent ConsumeTime 
        FROM [CASH].[dbo].[tb_inf] 
        WHERE AccountNo=@AccountNo AND GrpNo=98 AND ExChgDate>='2017-11-09 00:00:00.000' AND ExChgDate<='2018-04-16 00:00:00.000'
        ORDER BY ConsumeTime

        OPEN ConsumeTime_Cursor --打开成交时间游标
        FETCH NEXT FROM ConsumeTime_Cursor --获取下一行数据
        INTO @ConsumeTime

        WHILE(@@FETCH_STATUS=0)
        BEGIN
            --首次充值处理
            IF(@upConsumeTime='2017-11-09 00:00:00.000')
            BEGIN
                SET @upConsumeTime=@ConsumeTime
                SET @AddTimes=@AddTimes+1
            END

            ELSE 
            IF(DATEDIFF(MINUTE,@upConsumeTime,@ConsumeTime)<10) ----十分钟内的充值时间忽略
            BEGIN
                SET @upConsumeTime=@ConsumeTime
            END

            ELSE
            BEGIN
                SET @AddTimes=@AddTimes+1   --充值次数累加
                SET @TempTime=@TempTime+DATEDIFF(MINUTE,@upConsumeTime,@ConsumeTime)    --充值时间间隔累加
                SET @upConsumeTime=@ConsumeTime
            END

        FETCH NEXT FROM ConsumeTime_Cursor --获取下一行数据
        INTO @ConsumeTime
        END

        --仅充值一次或从未充值
        IF(@AddTimes=1)
        BEGIN
            SET @AVGTime=0
        END
        ELSE
        BEGIN
            SET @AVGTime=@TempTime/(@AddTimes-1)
        END
        --将得到的平均值存入临时表
        BEGIN
            INSERT INTO [CASH].[dbo].[everyoneAVG]
            VALUES(@AccountNo,@AVGTime,@AddTimes)
        END

        CLOSE ConsumeTime_Cursor    --关闭内部游标
        DEALLOCATE ConsumeTime_Cursor   --释放内部游标

    FETCH NEXT FROM allAcc_cursor   --获取游标下一行数据
    INTO @AccountNo --使变量获取当前游标指定行的账户号
    END
    CLOSE allAcc_cursor --关闭外部游标
    DEALLOCATE allAcc_cursor    --释放外部游标

END
GO

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