How to select xml data based on a condition in SQL

Question

Below is my xml

DECLARE @myDoc xml
DECLARE @ProdID int
SET @myDoc = 
'<Root>
<ProductDescription>
<ProductID>1</ProductID>
<ProductName>Road Bike</ProductName>
<GenID>0C866AE2-7AAA-474F-8794-7538986268AE</GenID>
<VocID>AF05E961-9BC3-4249-A4A7-C6146D6FC614</VocID>
<Features>
  <Warranty>1 year parts and labor</Warranty>
  <Maintenance>3 year parts and labor extended maintenance is available</Maintenance>
</Features>
</ProductDescription>
<ProductDescription>
<ProductID>2</ProductID>
<ProductName>Road Bike2</ProductName>
<GenID>D1DCAD29-08C6-401E-9A0A-2130DC5D8CD4</GenID>
<VocID>AF05E961-9BC3-4249-A4A7-C6146D6FC614</VocID>
<Features>
  <Warranty>2 year parts and labor</Warranty>
  <Maintenance>4 year parts and labor extended maintenance is available</Maintenance>
</Features>
</ProductDescription>
</Root>'
SET @ProdID =  @myDoc.value('(/Root/ProductDescription/ProductID)[2]', 'int' )
SELECT @ProdID

This will give me the ID for second item. If I change I have the GenID and VocID . Using that I need to query and get the other data. Kindly help me to generate query for the same.I am using SQL Server 2012. Thanks in advance.

Answer 1

I would select directly from the XML data and just move the item number you are selecting to the nodes rather than selecting an ID then filtering by that ID. That way you already have access to the other information.

Eg

SELECT  ProductID = x.value('ProductID[1]', 'int'),
        ProductName = x.value('ProductName[1]', 'varchar(100)'),
        GenID = x.value('GenID[1]', 'uniqueidentifier')
FROM    @myDoc.nodes('/Root/ProductDescription[2]') prod (x);

---

EDIT

To get the records that match a given GenID and VocID you can use the exist() method:

DECLARE @VocID UNIQUEIDENTIFIER = 'AF05E961-9BC3-4249-A4A7-C6146D6FC614',
        @GenID UNIQUEIDENTIFIER = 'D1DCAD29-08C6-401E-9A0A-2130DC5D8CD4';

SELECT  ProductID = x.value('ProductID[1]', 'int'),
        ProductName = x.value('ProductName[1]', 'varchar(100)'),
        GenID = x.value('GenID[1]', 'uniqueidentifier')
FROM    @myDoc.nodes('/Root/ProductDescription') prod (x)
WHERE   x.exist('VocID[text() = sql:variable("@VocID")]') = 1
AND     x.exist('GenID[text() = sql:variable("@GenID")]') = 1;