XQuery SQL Extract text value from a child element of a specific node - sql

Question

I'm struggling with the following situation: I need to extract that '10000' after
...name="stateid"> <from>10000</from>
I've managed to extract some that I need from the first node audittrail
SELECT ref.value ('#datetime', 'nvarchar(364)') as [LastTimeActioned],
ref.value ('#changedby', 'nvarchar(364)') as [Actioned_By]
FROM Audit
CROSS APPLY audit.Xml.nodes ('/audittrail') R(ref)
<audittrail id="137943" datetime="29-Feb-2016 15:42:06" changedby="quality" type="update">
<fields>
<field id="10022" name="Content Control">
<mergedValue>dsad</mergedValue>
<from />
<to>dsad</to>
</field>
<field id="10027" name="Document Controller">
<mergedValue>quality</mergedValue>
<from />
<to>quality</to>
</field>
<field id="10028" name="Document Owner">
<mergedValue>quality</mergedValue>
<from />
<to>quality</to>
</field>
<field id="10029" name="Document Type">
<mergedValue>Contract/Agreement</mergedValue>
<from />
<to>Contract/Agreement</to>
</field>
<field id="10067" name="StateId">
<from>10000</from>
<to>10000</to>
</field>
....
</fields>
</audittrail>

Answer 1

You're looking for the Xpath:
(fields/field[#name="StateId"]/from)[1]
i.e. Find me the "fields/field" element with the attribute name of value StateId, and select the contents of the immediate child from element:
SELECT
ref.value ('#datetime', 'nvarchar(364)') as [LastTimeActioned],
ref.value ('#changedby', 'nvarchar(364)') as [Actioned_By],
ref.value ('(fields/field[#name="StateId"]/from)[1]', 'integer') as StateIdFrom
FROM Audit
CROSS APPLY audit.Xml.nodes ('/audittrail') R(ref)
SqlFiddle Here
Note that you need to explicitly select the first text element result in XQuery (hence the extra parenthesis() and [1])
More technically correctly, you could also restrict the selection to the text() of the child from, i.e.:
(fields/field[#name="StateId"]/from/text())[1]