Reporting Services 的多值参数究竟能否用在数据集获取途径为存储过程的情景呢？...

编写映射到多值报表参数的查询

您可以为要创建的任何报表参数定义多值参数。不过，如果要将多个参数值传回查询，则必须满足下列要求：

数据源必须为 SQL Server、Oracle 或 Analysis Services。
数据源不能是存储过程。Reporting Services 不支持将多值参数数组传递给存储过程。
查询必须使用 IN 语句来指定参数。

MSDN有上述的描述，可见多值参数必须用于数据集查询文本为Select ... Where XXXId in (@Parameters)的典型应用，

如果用到存储过程就会报类型（ID参数是字符串型）无法转换等错误；

如获取数据为 exec dbo.pGetOrders @OrderID （存储过程内容见如下代码）

USE [AdventureWorks]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[spGetOrders]
    @OrderIDs varchar(500) = ''
AS
BEGIN
    SET NOCOUNT ON;

    DECLARE @sql varchar(500)

SET @sql = 'SELECT * FROM Sales.SalesOrderDetail';
    IF @OrderIDs <> '' SET @sql = @sql + ' WHERE [SalesOrderID] IN (' + @OrderIDs + ')';
    EXEC (@sql);

    SET NOCOUNT OFF;
END;

上面问题通过笔者反复琢磨，找到一种变通的办法：

增加一个“内部”参数，将其设置为级联参数（必须排列在上面提到的多值参数之后），如@InnerOrderIDs类型为String，可用值和默认值都设置为表达式如下：

=Join(Parameters!OrderID.Value, ", ")

然后修改获取数据的SQL为 exec dbo.pGetOrders @InnerOrderIDs就大功告成！

转载于:https://www.cnblogs.com/chriskwok/archive/2009/02/11/1388220.html

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Reporting Services 的多值参数究竟能否用在数据集获取途径为存储过程的情景呢？...

编写映射到多值报表参数的查询

Reporting Services 的多值参数究竟能否用在数据集获取途径为存储过程的情景呢？...相关推荐

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