Sql 返回select语句的结果，该语句使用FOR XML路径（'；'；）压缩到存储过程中的一行

我需要从我拥有的一些XML中提取几个值，并将其作为一个字符串从存储过程中返回。我已经创建了select语句，该语句将把所有行合并为一行

这是我目前拥有的代码

CREATE FUNCTION openrpt.getSearchTermNames (@searchID NVARCHAR(MAX)) 
RETURNS VARCHAR(MAX) AS 
BEGIN 
  DECLARE @xmlData XML 
  DECLARE @Names XML 
  SET @xmlData = 
  ( 
         SELECT QueryXML 
         FROM   ConflictsSearchTerms 
         WHERE  ConflictsSearchTerms.[ID] = @searchID); 
  WITH xmlnamespaces ( default 'http://schemas.datacontract.org/2004/07/IntApp.Wilco.Model.Conflicts.Searches', 'http://schemas.microsoft.com/2003/10/Serialization/Arrays' AS d2p1, 'http://www.w3.org/2001/XMLSchema-instance' AS i ) 
  RETURN 
  ( 
         SELECT '; ' + temp.value('.', 'NVARCHAR(MAX)') 
         FROM   @xmlData.nodes('/ConflictsSearchTermQuery/TermItems/d2p1:string') AS XMLDATA(temp)
         UNION 
         SELECT '; ' + temp.value('d2p1:Value[1]', 'NVARCHAR(MAX)')                                                 AS [Test]
         FROM   @xmlData.nodes('/ConflictsSearchTermQuery/CorporateTreeCompaniesById/d2p1:KeyValueOfstringstring') AS XMLDATA(temp) FOR XML PATH('') 
  )

select statemt将正确返回XML中由分号分隔的两个字段中的项目列表，但返回时出现语法错误。我还得到一个错误，它说

The FOR XML clause is invalid in views, inline functions, derived tables, and subqueries when they contain a set operator. To work around, wrap the SELECT containing a set operator using derived table syntax and apply FOR XML on top of it.

试试这个：

CREATE FUNCTION openrpt.getSearchTermNames
    (
      @searchID NVARCHAR(MAX)
    )
RETURNS NVARCHAR(MAX)
AS
    BEGIN 
        DECLARE @xmlData XML 
        DECLARE @Names XML 
        DECLARE @x XML


        SET @xmlData = ( SELECT QueryXML
                         FROM   ConflictsSearchTerms
                         WHERE  ConflictsSearchTerms.[ID] = @searchID
                       ); 

        WITH XMLNAMESPACES ( DEFAULT 'http://schemas.datacontract.org/2004/07/IntApp.Wilco.Model.Conflicts.Searches', 'http://schemas.microsoft.com/2003/10/Serialization/Arrays' AS d2p1, 'http://www.w3.org/2001/XMLSchema-instance' AS i ) 
        SELECT @x =  
        ( SELECT * FROM (
             SELECT '; ' + temp.value('.', 'NVARCHAR(MAX)') AS [Test]
             FROM   @xmlData.nodes('/ConflictsSearchTermQuery/TermItems/d2p1:string') AS XMLDATA(temp)
             UNION 
             SELECT '; ' + temp.value('d2p1:Value[1]', 'NVARCHAR(MAX)')                                                 
             FROM   @xmlData.nodes('/ConflictsSearchTermQuery/CorporateTreeCompaniesById/d2p1:KeyValueOfstringstring') AS XMLDATA(temp))t 
             FOR XML PATH('') 
        )

        RETURN CAST(@x AS NVARCHAR(MAX))
    END  

---

您是否尝试使用

将Nvarchar（MAX）返回为
而不是Varchar？是的，我尝试在return处仍然得到语法错误。这允许我返回值，但它添加了我不想要的XML标记。它添加了一个名为Test的节点，将该值放入其中，而不仅仅返回值列表。我通过添加两个replace语句来消除标记，从而解决了这个问题。谢谢你的帮助