sql – 存储过程：使用临时表减少代码重复

在对我的存储过程进行了许多更改之后,我认为它需要重新分解,主要是因为代码重复.如何克服这些重复：

IF @transExist > 0 BEGIN
    IF @transType = 1 BEGIN --INSERT
        SELECT
            a.dayDate,a.shiftName,a.limit,b.startTimeBefore,b.endTimeBefore,b.dayAdd,b.name,b.overtimeHours,c.startTime,c.endTime
        INTO 
            #Residence1
        FROM 
            #ShiftTrans a 
            RIGHT OUTER JOIN #ResidenceOvertime b
                ON a.dayDate = b.dayDate
            INNER JOIN ShiftDetails c
                ON c.shiftId = a.shiftId AND 
                c.shiftTypeId = b.shiftTypeId;

        SET @is_trans = 1;
    END ELSE BEGIN
        RETURN ;
    END
END ELSE BEGIN
    IF @employeeExist > 0 BEGIN
        SELECT
            a.dayDate,c.endTime
        INTO 
            #Residence2
        FROM 
            #ShiftEmployees a 
            RIGHT OUTER JOIN #ResidenceOvertime b
                ON a.dayDate = b.dayDate
            INNER JOIN ShiftDetails c
                ON c.shiftId = a.shiftId AND 
                c.shiftTypeId = b.shiftTypeId;

            SET @is_trans = 0;
    END ELSE BEGIN
        RETURN;
    END
END;

IF @is_trans = 1 BEGIN
    WITH CTE_Residence_Overtime_trans AS (
        SELECT * FROM #Residence1
    )

    UPDATE t1
    SET 
        t1.over_time = t1.over_time 
          + CAST(RIGHT('0'+ CAST(overtimeHours as varchar(2)),2)
             +':00:00' As Time) 
          + CAST(RIGHT('0'+ CAST(@total_min  as varchar(2)),2)
             +':00:00' As Time),t1.day_flag = t1.day_flag + 'R1',t1.day_desc = 'R::' 
          + CTE_Residence_Overtime_trans.shiftName +'[ '
          + CTE_Residence_Overtime_trans.name +' ]'
    FROM 
        rr_overtime AS t1
        INNER JOIN CTE_Residence_Overtime_trans 
            ON t1.[trans_date] = CTE_Residence_Overtime_trans.[dayDate]
    WHERE 
        t1.emp_num = @empNum;

    UPDATE rr_overtime 
    SET 
        over_time = CAST(RIGHT('0'+ CAST(0 as varchar(2)),2)+':00:00' As Time),day_flag = day_flag +'R2'
    WHERE 
        trans_date = @TomorrowDate AND 
        emp_num = @empNum;

END ELSE BEGIN
    WITH CTE_Residence_Overtime AS (
        SELECT * FROM #Residence2
    )

    UPDATE t1
    SET 
        t1.over_time = CAST(RIGHT('0'+ CAST(overtimeHours as varchar(2)),2) 
          +':00:00' As Time)
        + CAST(RIGHT('0'+ CAST(@total_min  as varchar(2)),t1.day_desc = 'R::' 
          + CTE_Residence_Overtime.shiftName +'[ '
          + CTE_Residence_Overtime.name +' ]'
    FROM 
        rr_overtime AS t1
        INNER JOIN CTE_Residence_Overtime 
            ON t1.[trans_date] = CTE_Residence_Overtime.[dayDate]
    WHERE 
        t1.emp_num = @empNum ;

    UPDATE rr_overtime 
    SET 
        over_time = CAST(RIGHT('0'+ CAST(0 as varchar(2)),day_flag = day_flag +'R2'
    WHERE 
        trans_date = @TomorrowDate AND 
        emp_num = @empNum;

END

解决方法

那么如果您从表中执行Select *,则不需要CTE,因此只需从表中直接调用即可.由于该表只包含一个选择或另一个的数据,并且字段名称相同等,我们可以只使用一个更新,如果是,则不再需要：

Create table #Residence (dayDate varchar(9),shiftName varchar(20),limit int,startTimeBefore time,endTimeBefore time,dayAdd int,name varchar(30),overtimeHours int,startTime time,endTime time)

IF @transExist > 0 

       BEGIN

        IF @transType = 1 --INSERT
           BEGIN
          Insert into #Residence
          SELECT a.dayDate,c.endTime
           FROM #ShiftTrans a RIGHT OUTER JOIN #ResidenceOvertime b
           ON a.dayDate = b.dayDate
           INNER JOIN ShiftDetails c
           ON c.shiftId = a.shiftId AND c.shiftTypeId = b.shiftTypeId;
           END
         ELSE
           BEGIN
           RETURN ;
           END
       END

  ELSE
     BEGIN

        IF @employeeExist > 0
            BEGIN
            Insert into #Residence
            SELECT a.dayDate,c.endTime
            FROM #ShiftEmployees a RIGHT OUTER JOIN #ResidenceOvertime b
            ON a.dayDate = b.dayDate
            INNER JOIN ShiftDetails c
            ON c.shiftId = a.shiftId AND c.shiftTypeId = b.shiftTypeId;
            END
        ELSE
           BEGIN
             RETURN ;
           END
     END;

    UPDATE t1 
    SET t1.over_time = t1.over_time + CAST(RIGHT('0'+ CAST(overtimeHours  as varchar(2)),2)+':00:00' As Time) +
    CAST(RIGHT('0'+ CAST(@total_min  as varchar(2)),t1.day_desc = 'R::' +R.shiftName +'[ '+ R.name +' ]'

    FROM rr_overtime AS t1
    INNER JOIN #Residence R
    ON t1.[trans_date] = R.[dayDate]
    WHERE t1.emp_num = @empNum ;

    UPDATE rr_overtime SET over_time = CAST(RIGHT('0'+ CAST(0 as varchar(2)),day_flag = day_flag +'R2'
    WHERE trans_date = @TomorrowDate AND emp_num = @empNum;

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