Question

在T-SQL中，我希望通过逐行读取来遍历存储过程中的表。

DECLARE @IMAX INT,
        @ICOUNT INT,
        @INTERFACE_ID_36 INT,
        @INTERFACE_ID_38 INT

SELECT * FROM INTERFACE_36_DATA

SET @IMAX = @@ROWCOUNT
SET @ICOUNT = 1

WHILE(@ICOUNT <= @IMAX)
    BEGIN
        SELECT @INTERFACE_ID_36 = Interface_ID
        FROM INTERFACE_36_DATA
        WHERE ROW_NUMBER() OVER (ORDER BY id) AS  = @ICOUNT   --syntax error here

            IF @INTERFACE_ID_36 = 10
                SET @INTERFACE_ID_38 = 0
            ELSE IF @INTERFACE_ID_36 =

Answer 1

我建议使用游标重写它，如下所示：

DECLARE @IMAX INT,
        @ICOUNT INT,
        @INTERFACE_ID_36 INT,
        @INTERFACE_ID_38 INT

DECLARE db_cursor CURSOR FOR  
SELECT Interface_ID FROM INTERFACE_36_DATA  

OPEN db_cursor   
FETCH NEXT FROM db_cursor INTO @INTERFACE_ID_36   

WHILE @@FETCH_STATUS = 0   
BEGIN
       SELECT @INTERFACE_ID_36
       -- All your other selects  

       FETCH NEXT FROM db_cursor INTO @INTERFACE_ID_36   
END   

CLOSE db_cursor   
DEALLOCATE db_cursor

Answer 2

更改您的查询，如下所示。因为我们不能在where条件中使用row_number。 Check the link here for more descr

WITH    cte
          AS ( SELECT   Interface_ID ,
                        ROW_NUMBER() OVER ( ORDER BY id ) AS RN
               FROM     INTERFACE_36_DATA
             )
    SELECT  @INTERFACE_ID_36 = Interface_ID
    FROM    cte
    WHERE   RN = @ICOUNT

Answer 3

您可以尝试这样做：

DECLARE @IMAX INT,
        @ICOUNT INT,
        @INTERFACE_ID_36 INT,
        @INTERFACE_ID_38 INT
select *,ROW_NUMBER() OVER (ORDER BY Interface_ID) RowId  into #tmptbl from INTERFACE_36_DATA

Declare @I BIGINT = 1    
declare @count BIGINT = (select Count(*)  from #tmptbl)    
while(@I < = @count)    
  begin  

        SELECT @INTERFACE_ID_36 = Interface_ID
        FROM #tmptbl
        where   RowId = @I

        --- do yor additional stuff
   set @I =@I +1    
  end

循环逐行T-SQL

3 个答案: