Question

使用SQL Server Reporting Services，我想生成一个包含某些订单的行详细信息的报告，如下所示：

Order  Details
2315   1x5432 Apple Tree, 9x912 Roses, 1x13 Spade
2316   3x12 Lawn grass

如果使用transact SQL或使用Reporting Services中内置的东西，我怎么能最有效地做到这一点？（我可能会以许多订单结束，因此每个订单行的调用可能很昂贵......）

Answer 1

我一般用用户定义的函数解决了这类问题。

CREATE FUNCTION GetDetails (@order_id INT) RETURNS NVARCHAR(1000) AS
BEGIN 
  DECLARE mycursor
  CURSOR READ_ONLY
  FOR SELECT description
  FROM OrderDetails
  WHERE order_id = @order_id

  DECLARE @description NVARCHAR(100)
  DECLARE @return_value NVARCHAR(1000)

  SET @return_value = ''
  OPEN mycursor
  FETCH NEXT FROM mycursor INTO @description
  WHILE @@fetch_status = 0
  BEGIN
    SET @return_value = @return_value + @description
    FETCH NEXT FROM mycursor INTO @description
    IF (@@fetch_status = 0) SET @return_value = @return_value + ', '
  END
  CLOSE mycursor
  DEALLOCATE mycursor
  RETURN @return_value
END;

您的查询将是：

SELECT order_id, GetDetails(order_id) as details
FROM Order

Answer 2

我使用FOR XML和STUFF

做同样的事情

SELECT DISTINCT 
    Col1.Table_Name TableName, 
    STUFF 
    (
            (
            SELECT
            ', ' + CONVERT (VARCHAR, Col2.Column_name)
            FROM Information_Schema.Columns Col2
            WHERE Col1.Table_Name = Col2.Table_Name
            ORDER BY Col2.Table_Name
            FOR XML PATH('')
            ), 1, 2, ''
    ) AS ColumnNames
FROM Information_Schema.Columns Col1

Answer 3

我使用受this thread启发的COALESCE解决了它：


CREATE FUNCTION GetDetails(@OrderID varchar(10))
RETURNS varchar(1000) AS
BEGIN
  DECLARE @result varchar(1000), @delimiter char

  SET @delimiter = ','

  SELECT @result = COALESCE(@result + @delimiter, '') + Details
  FROM 
    (
      SELECT ProductNumber
        , Quantity + 'x' + ProductNumber + ' ' + ProductName AS Details
      FROM OrderDetail where OrderID = @OrderID
    ) OrderDetail
  ORDER BY ProductNumber

  RETURN @result
END

然后，如同the answer by Jeremy Stein：

SELECT OrderId, GetDetails(OrderId) AS Details
FROM Order

SQL Server Reporting包装输出行

3 个答案: