Question

我认为我可以使用WHILE LOOP执行此操作，但每次都会更新所有行。

我有一个表，我需要使用应用程序唯一值函数更新具有唯一ID的两个字段。该函数给了我一个GUID（Trans），另一个给了我一个唯一的Trans_ID。我需要使用这些唯一ID更新每一行。

我将更新一行，运行该函数以获取下一个唯一数字，然后填充下一行。我无法弄清楚如何做到这一点。

        DECLARE @RowCount as INT
        DECLARE @IntFlag as INT
        SET     @IntFlag = 1
        SELECT  @RowCount = count(*) from trans_periodic_retainer_final
        DECLARE @TransID as char(20)                                    
        DECLARE @BatchID uniqueidentifier
        WHILE   @IntFlag <=@RowCount
        BEGIN

            /* Functions to get the unique values */
            UPDATE Increments SET Increment = Increment+1 WHERE v7Tables = 'Transactions' AND Site = 'TESTSERVER'
            SET @BatchID = newid()
            SELECT @TransID = Increment FROM Increments WHERE v7Tables = 'Transactions'         AND Site = 'TESTSERVER'

            UPDATE Transactions set trans = @BatchId, Trans_id = @TransID

            SET @IntFlag = @intFlag +1
        END

任何帮助将不胜感激。

Answer 1

希望您尝试更新“交易表”。在这种情况下，你在update语句中缺少where子句，而且我还有一个问题，你可以在where子句中使用哪一列。？

UPDATE Transactions set trans = @BatchId, Trans_id = @TransID WHERE (IdentityColum) = Value.

Answer 2

这是我现在能想到的，试着告诉我。

DECLARE Tran_Cursor CURSOR FOR 
SELECT * FROM Transactions
OPEN Tran_Cursor
FETCH NEXT FROM Tran_Cursor
WHILE @@FETCH_STATUS = 0
BEGIN
     UPDATE Increments SET Increment = Increment+1 WHERE v7Tables = 'Transactions' AND Site = 'TESTSERVER'
     SET @BatchID = newid()
     SELECT @TransID = Increment FROM Increments WHERE v7Tables = 'Transactions' AND Site = 'TESTSERVER'

     UPDATE Transactions set trans = @BatchId, Trans_id = @TransID  WHERE CURRENT OF Tran_Cursor
     SET @IntFlag = @intFlag +1
FETCH NEXT FROM Tran_Cursor
END
CLOSE Tran_Cursor
DEALLOCATE Tran_Cursor

如果您不想更新已具有唯一ID的记录，则可以替换以下语句

DECLARE Tran_Cursor CURSOR FOR 
SELECT * FROM Transactions

以下

DECLARE Tran_Cursor CURSOR FOR 
SELECT * FROM Transactions WHERE Trans_id IS NOT NULL

如何使用不同的值更新每一行？

2 个答案: