LK_Project01

MS SQL ตัวอย่าง Loop

Here's an example of how you can use cursors to do loops:

-- set up some test data
declare @table_a table (PK_TableA_ID int)
declare @table_b table (PK_TableB_ID int)
insert @table_a values (1),(2),(3)
insert @table_b values (4),(5),(6)

-- do the actual processing
SET NOCOUNT ON

DECLARE @TableA_ID int, @TableB_ID int

DECLARE TableA_cursor CURSOR FOR SELECT PK_TableA_ID FROM @table_a

OPEN TableA_cursor
FETCH NEXT FROM TableA_cursor INTO @TableA_ID

WHILE @@FETCH_STATUS = 0
BEGIN
DECLARE TableB_cursor CURSOR FOR SELECT PK_TableB_ID FROM @table_b

OPEN TableB_cursor
    FETCH NEXT FROM TableB_cursor INTO @TableB_ID

WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT CAST(@TableA_ID AS CHAR(1)) + ':' + CAST(@TableB_ID AS CHAR(1))
        -- execute your stored procedure here:
        -- EXEC Your_stored_procedure (@TableA_ID, @TableB_ID) 
        FETCH NEXT FROM TableB_cursor INTO @TableB_ID
        END

CLOSE TableB_cursor
    DEALLOCATE TableB_cursor

FETCH NEXT FROM TableA_cursor INTO @TableA_ID
END 
CLOSE TableA_cursor
DEALLOCATE TableA_cursor

The cursor above (with the test data in the temporary tables) will generate this output:

1:4
1:5
1:6
2:4
2:5
2:6
3:4
3:5
3:6