游标实用例子

 DECLARE @orderno varchar(50) 
    declare @product_no varchar(50)
    declare @color varchar(50)
    declare @product_size varchar(50)
    DECLARE CusCursor CURSOR FOR  SELECT orderno FROM tbl_5351_24
    OPEN CusCursor  
    FETCH NEXT FROM CusCursor INTO @orderno 
    WHILE (@@FETCH_STATUS = 0) 
         BEGIN        
          --select @product_no=product_no,@color=color,@product_size=product_size from shop.dbo.tbl_order  where orderno=@orderno
          set @product_size=(select product_size from shop.dbo.tbl_order  where orderno=@orderno)
          set @product_no=(select product_no from shop.dbo.tbl_order  where orderno=@orderno)
        
          update shop.dbo.tbl_order set product_size='37' where orderno=@orderno
          update shop.dbo.tbl_product_store set number3=number3-1 where product_no=@product_no and color='21' and product_size='37'
         FETCH NEXT FROM CusCursor  INTO @orderno 
         END
     CLOSE CusCursor  
     DEALLOCATE CusCursor