通过SQL Cursor更新计算值

Question

我有两列（TSD_BALANCEUNITS 和 TSD_UNITSINCERT）。 TSD_BALANCEUNITS 有数值，TSD_UNITSINCERT 有 0.00

通过使用游标，我想将 TSD_BALANCEUNITS 的值更新为 TSD_UNITSINCERT 直到总和从 TSD_BALANCEUNITS 更新到 TSD_UNITSINCERT 的值等于 199.00

和正在更新的TSD_BALANCEUNITS的值变为0.00并移动到TSD_UNITSINCERT时总计移动值的总和等于 199.00

下面是我正在使用的脚本...

        DECLARE @cnt INT = 0;
        DECLARE @TSD_BALANCEUNITS AS DECIMAL(25, 4)
        DECLARE @TSD_UNITSINCERT AS DECIMAL(25, 4)
        DECLARE @CHECKFLAG AS DECIMAL(25, 4)
        DECLARE LOCK_CERT_UNITS CURSOR LOCAL STATIC
        FOR

        SELECT TSD_BALANCEUNITS
            ,TSD_UNITSINCERT
        FROM IS_TRX_TRX_PROCESSED
        WHERE (TSD_ACCCODE = 8775)
            AND TSD_BALANCEUNITS > 0
        ORDER BY TSD_REALIZEDDATE ASC


        OPEN LOCK_CERT_UNITS

        FETCH NEXT
        FROM LOCK_CERT_UNITS
        INTO @TSD_BALANCEUNITS
            ,@TSD_UNITSINCERT

        WHILE @@FETCH_STATUS = 0 --AND @cnt < 199.00
        BEGIN
            SET @TSD_UNITSINCERT = @TSD_BALANCEUNITS
            SET @CHECKFLAG = + @TSD_BALANCEUNITS

            IF (SUM(@CHECKFLAG) <= 199.00)
            BEGIN
                UPDATE IS_TRX_TRX_PROCESSED
                SET TSD_UNITSINCERT = TSD_BALANCEUNITS
                WHERE (TSD_ACCCODE = 8775)
                    AND TSD_BALANCEUNITS > 0
            END

            PRINT 'BALANCE UNIT =' + CONVERT(VARCHAR(50), @TSD_BALANCEUNITS) + ' ==> ' + 'CERT IN UNITS =' + CONVERT(VARCHAR(50), @TSD_UNITSINCERT);

            FETCH NEXT
            FROM LOCK_CERT_UNITS
            INTO @TSD_BALANCEUNITS
                ,@TSD_UNITSINCERT
        END

        CLOSE LOCK_CERT_UNITS

        DEALLOCATE LOCK_CERT_UNITS
        GO

Answer 1

这个命令：

UPDATE IS_TRX_TRX_PROCESSED
SET    TSD_UNITSINCERT = TSD_BALANCEUNITS
WHERE  (TSD_ACCCODE = 8775)
AND    TSD_BALANCEUNITS > 0

更新所有 TSD_ACCCODE = 8775 且 TSD_BALANCEUNITS > 0 的记录，总和是否为 999 并不重要，您需要以某种方式确定哪些记录必须更新。

其次，根据结果，这永远不会发生。这意味着 IF (SUM(@CHECKFLAG) <= 199.00) 永远不会为真。我想是因为您从未将其值初始化为 0。

SET @CHECKFLAG = 0;

通过SQL Cursor更新计算值

Update and calculate value through SQL Cursor

sql

sql-server

cursor

sql-update