SQL Server 2008 XML Query - sql

Question

I need some more help with another XML query. Below is an example of a record of my XML column:
<Fields>
<MappedFields>
<Field name="FormNumber" value="21" />
<Field name="ProcedureCode" value="T2023" />
<Field name="CurrentDate" value="4/23/2012" />
</MappedFields>
</Fields>
The field elements may appear in any order, so it can appear like this as well:
<Fields>
<MappedFields>
<Field name="ProcedureCode" value="G5532" />
<Field name="FormNumber" value="12" />
<Field name="CurrentDate" value="3/29/2011" />
</MappedFields>
</Fields>
What I am looking for, is a query that will get the value of the Field with the name "FormNumber" for all the records in the table. The query I have below works if the Field with the name of "FormNumber" is the first Field element in the XML. What I need is a query that will find the Field element even if it is not the first element. Can someone help me out with this?
SELECT
X.Node.value(N'(Field/#value)[1]', 'nvarchar(max)') AS FormNumber
FROM
dbo.MHTCM_LetterSent A
CROSS APPLY A.LetterXML.nodes(N'/Fields/MappedFields') AS X(Node)
WHERE
X.Node.value(N'(Field/#name)[1]', 'nvarchar(max)') = 'FormNumber'

Answer 1

You can have a test in the xml path like [#name="FormNumber"].
SELECT
X.Node.value(N'(Field[#name="FormNumber"]/#value)[1]', 'nvarchar(max)') AS FormNumber
FROM
dbo.MHTCM_LetterSent A
CROSS APPLY A.LetterXML.nodes(N'//Fields/MappedFields') AS X(Node)
Note the WHERE isn't needed now.
It might make more sense to move the test to the CROSS APPLY:
SELECT
X.Node.value(N'(./#value)[1]', 'nvarchar(max)') AS FormNumber
FROM
dbo.MHTCM_LetterSent A
CROSS APPLY A.LetterXML.nodes(N'//Fields/MappedFields/Field[#name="FormNumber"]') AS X(Node)
Edit- I made the paths absolute (//) and both examples are working for me.