TSQL where on xml data type

问题:

How does one execute where clause command on a xml data type in Sql Server 2005 ?

Xml Structure

<User UserId="1" UserName="x">
<User UserId="2" UserName="y">

Query

SELECT XmlColumn from Table where XmlColumn.query('/User[@UserId'+ @dynamicValue +']')

Intended Output

Get all the user tags where the attribute UserId = input variable

回答1:

declare @T table
(
  XMLColumn xml
)

insert into @T values ('<User UserId="1" UserName="x"/>')
insert into @T values ('<User UserId="2" UserName="y"/>')

declare @UserID int
set @UserID = 1

select XMLColumn
from @T
where XMLColumn.exist('/User[@UserId = sql:variable("@UserID")]') = 1

Result:

XMLColumn
---------------------------------
<User UserId="1" UserName="x" />