Forespørg data fra en XML-kolonne i SQL Server

.query vil altid returnere datatypen XML.

For at forespørge en værdi skal du bruge ".value" og angive datatypen som den anden parameter.

Brug dette i stedet:

declare @xmlobj as xml = '<SimpleUserData xmlns="http://schemas.datacontract.org/2004/07/MyProject.CustomFx.Web" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/" z:Id="1" z:Type="MyProject.CustomFx.Web.SimpleUserData" z:Assembly="MyProject.CustomFx.Web, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
      <BatchDescription z:Id="2">I want this value</BatchDescription>
      <BatchID>9c437c08-0f28-4c77-9a50-49a7a4e8930a</BatchID>
      <BatchTemplateID>And this value too</BatchTemplateID>
    </SimpleUserData>';

WITH XMLNAMESPACES('http://schemas.datacontract.org/2004/07/MyProject.CustomFx.Web' as x)
select
  @xmlobj.value('(/x:SimpleUserData[1]/x:BatchDescription[1])','nvarchar(max)') as value1
 ,@xmlobj.value('(/x:SimpleUserData[1]/x:BatchTemplateID[1])','nvarchar(max)') as value2;