SQL Using OpenXML to retrieve multiple Elements - sql-server

Question

I'm querying using OpenXML to retrieve the cap elements between the subject elements in XML I don't want the cap between the support elemements. The query works great to retrieve one value but fails when there are multiple element nodes.
<First>
<Test id="83847">
<subject>
<cap>15</cap>
<cap>25</cap>
<cap>100</cap>
</subject>
<support>
<cap>9</cap>
</support>
</Test>
<Test id="83848">
<subject>
<cap>150</cap>
<cap>2</cap>
<cap>10</cap>
</subject>
<support>
<cap>9</cap>
</support>
</Test>
</First>
CREATE Table #XmlTemp(XmlField Xml);
Set Nocount On;
Insert Into #XmlTemp(XmlField)
Select '<First>
<Test id="83847">
<subject>
<cap>15</cap>
<cap>25</cap>
<cap>100</cap>
</subject>
<support>
<cap>9</cap>
</support>
</Test>
<Test id="83848">
<subject>
<cap>150</cap>
<cap>2</cap>
<cap>10</cap>
</subject>
<support>
<cap>9</cap>
</support>
</Test>
</First>'As XmlField;
Declare #xmlData Xml;
Select #xmlData = XmlField From #XmlTemp;
Declare #document int;
Exec sp_xml_preparedocument #document Output, #xmlData, NULL;
SELECT ID,Cap FROM(
SELECT ID,Cap FROM OpenXml(#document,'./First/Test', 0) With (ID varchar(max)'./#id', Cap Varchar(max) './subject/cap')) alias
drop table #xmltemp
It'd be fairly time consuming to change the query to use .nodes method more so because of the testing involved so I'd like it to stay as OpenXML if possible.
I'd only like to retrieve out the ID and then the multiple cap element values.
Thank you for your time.

Answer 1

I can't see why the query using .nodes is complex. Just
SELECT t.n.value('(/First/Test/#id)[1]', 'int') id
, t.n.value('(.)[1]', 'int') cap
from #xmlData.nodes('./First/Test/subject/cap') t(n);
And OpenXML version
SELECT ID,Cap FROM(
SELECT ID,Cap
FROM OpenXml(#document,'./First/Test/subject/cap', 0)
With (ID varchar(max) '/First/Test/#id'
, Cap Varchar(max) '.')) alias
Version for the edited question
SELECT ID,Cap FROM(
SELECT ID,Cap
FROM OpenXml(#document,'/First/Test/subject/cap', 0)
With (ID varchar(max) '../../#id'
, Cap Varchar(max) '.')) alias
It returns only subject/cap and #id of the proper parent:
ID Cap
1 83847 15
2 83847 25
3 83847 100
4 83848 150
5 83848 2
6 83848 10

Answer 2

Your XML is double nested. You have 1:n of <Test> elements within <First> and again 1:n of <cap> elements within <subject>.
The proper way to query this is diving into the XML strictly forward:
CREATE Table #XmlTemp(XmlField Xml);
Set Nocount On;
Insert Into #XmlTemp(XmlField)
Select '<First>
<Test id="83847">
<subject>
<cap>15</cap>
<cap>25</cap>
<cap>100</cap>
</subject>
<support>
<cap>9</cap>
</support>
</Test>
<Test id="83848">
<subject>
<cap>150</cap>
<cap>2</cap>
<cap>10</cap>
</subject>
<support>
<cap>9</cap>
</support>
</Test>
</First>'As XmlField;
--The query will use .nodes() to get all <Test> elements and again .nodes() to get the related <cap> elements:
SELECT t.value('#id', 'int') id
,c.value('text()[1]', 'int') cap
from #XmlTemp AS tbl
CROSS APPLY tbl.XmlField.nodes('/First/Test') AS A(t)
CROSS APPLY A.t.nodes('subject/cap') AS B(c);
GO
DROP TABLE #XmlTemp;