使用WITH XMLNAMESPACES的SSRS查询没有返回数据集

Question

我为SSRS报告编写的sql查询在SSMS中执行完美，但在SSRS报告中运行时未能返回结果。报表服务器或数据库服务器上没有错误。SSRS报告呈现但不包含数据。我尝试运行SQL分析器，查询根本不显示。我在服务器上有几个其他报告正确运行，并且查询显示在SQL分析器中。在损坏的报告中唯一不同的是，我使用;WITH XMLNAMESPACES(DEFAULT 'urn:hl7-org:v3')

查询XML数据

我得到相同的结果运行在SQL Server 2005和2008

这是查询，关于为什么在SSRS中运行时没有返回任何东西的任何想法。我已经修改了查询以删除/修改可能导致语法错误的客户端信息，但是未修改的查询运行并在SSMS

中运行时返回结果。

Declare @MinDate datetime;
Declare @MaxDate datetime;
DECLARE @fooData TABLE (msgId varchar(100), TransactionName     varchar(30),SourceSystem varchar(12),MsgDay date) 
;WITH XMLNAMESPACES(DEFAULT 'urn:hl7-org:v3')
INSERT INTO @fooData
SELECT 
       MsgLogID as msgId
      ,TransactionName =
            CASE LEFT(MsgBody,28)
                    --WHEN '<qqqResult' THEN 'qqqResult'
                    WHEN '<qqqResult xmlns=' THEN 'qqqResult'
                    ELSE 'qqqqRevised'
                    END
    , SourceSystem =
            CASE LEFT(MsgBody,21)
                    --WHEN '<qqqResult' THEN CONVERT(XML,[MsgBody]).value('(/qqqResult/receiver/device/id/@extension)[1]','varchar(1000)')
                    WHEN '<qqqResult' THEN CONVERT(XML,[MsgBody]).value('(/qqqResult/sender/device/id/@extension)[1]','varchar(1000)')
                    ELSE CONVERT(XML,[MsgBody]).value('(/qqqRevised/sender/device/id/@extension)[1]','varchar(1000)')
                    END
     , Convert(date,[MsgDateTime]) as MsgDay
  FROM [foo].[dbo].[fooMegerPerson_WCF]

  WHERE [TransactionStatus] = 'Valid'
SELECT @MaxDate=DATEADD(DAY,0,datediff(day,0, MAX([MsgDateTime]))) ,@MinDate=DATEADD(DAY,0,datediff(day,0, MIN ([MsgDateTime])) )FROM [foo].[dbo].[fooMegerPerson_WCF]
-- Declare a temp table for the query msg type so that we can create a join
DECLARE @msgNameTable TABLE (msgName varchar(30))
INSERT INTO @msgNameTable (msgName)
Values ('qqqResult'),('fooRevised')
DECLARE @sourceTable TABLE (sourceName varchar(10))
INSERT INTO @sourceTable (sourceName)
Values ('foo_1'),('foo_2') 
--Select * from @msgNameTable
-- create a date table containing every day between start and end
DECLARE @datetable TABLE (d date) 
INSERT INTO @datetable
SELECT     TOP (DATEDIFF(DAY, @MinDate, @MaxDate) + 1) Date = DATEADD(DAY, ROW_NUMBER() OVER (ORDER BY a.object_id) - 1, 
@MinDate)
FROM         sys.all_objects a CROSS JOIN
                      sys.all_objects b
-- cross join to create a daily entry for every msg type and every source system                      
DECLARE @dateNameSourceTable  TABLE (d date, msgName varchar (30),sourceName varchar(10)) 
INSERT INTO @dateNameSourceTable                     
                    Select dt.d, mn.msgName, st.sourceName from @datetable dt CROSS JOIN @msgNameTable mn CROSS JOIN @sourceTable st
--SELECT * FROM @dateNameSourceTable

Select Count(x.msgId) AS MessageCount,dsn.msgName AS TransactionName ,dsn.d, dsn.sourceName 
FROM @fooData   as X
  RIGHT JOIN @dateNameSourceTable dsn ON x.MsgDay = dsn.d  AND x.SourceSystem = dsn.sourceName  AND x.TransactionName = dsn.msgName
   Group By dsn.d, dsn.msgName, dsn.sourceName
  Order By dsn.d, dsn.sourceName , dsn.msgName

Answer 1

破碎的报告中唯一不同的是我是使用;WITH XMLNAMESPACES(DEFAULT 'urn:hl7-org:v3')查询XML数据

这是非常重要的唯一的事情…

DECLARE @XML XML=
'<root><a>test</a></root>';
SELECT @XML.value('(/root/a)[1]','nvarchar(max)')

返回"test"

WITH XMLNAMESPACES(DEFAULT 'tmpUri')
SELECT @XML.value('(/root/a)[1]','nvarchar(max)')

返回"零"

,

DECLARE @XML XML=
'<root xmlns="tmpUri"><a>test</a></root>';
WITH XMLNAMESPACES(DEFAULT 'tmpUri')
SELECT @XML.value('(/root/a)[1]','nvarchar(max)')

返回"test"，但如果没有命名空间提示，同样会返回"NULL"…

省略所有名称空间有一个通用技巧:使用通配符!

SELECT @XML.value('(/*:root/*:a)[1]','nvarchar(max)')