Introduction
These days XML data is used extensively in applications. SQL Server also manage XML data efficiently to fetch data from XML content. Here we will discuss how to fetch data when XML contains Namespace tag. Let’s start:
Using Code
The following code snippet defines a XML variable with namespace tag (xmlns) containing “http://tempnamespace/default”,
- DECLARE @data XML;
- SET @data = '<EmplyoeeInfo xmlns="http://tempnamespace/default">
- <Employee ID="1">
- <Name>Manas</Name>
- <Profession>Software</Profession>
- </Employee>
- </EmplyoeeInfo>';
Now have a look at the following code snippet to fetch data,
- WITH XMLNAMESPACES (DEFAULT 'http://tempnamespace/default')
- SELECT @data.value('(EmplyoeeInfo/Employee/@ID)[1]', 'nvarchar(100)') as ID,
- @data.value('(EmplyoeeInfo/Employee/Name)[1]', 'nvarchar(100)') as Name,
- @data.value('(EmplyoeeInfo/Employee/Profession)[1]', 'nvarchar(100)') as Profession;
In proceeding code it uses with XML Namespaces which provides namespace URI support in the following ways:
- It makes the namespace prefix to URI mapping available when Constructing XML Using FOR XML queries.
- It makes the namespace to URI mapping available to the static namespace context of the xml Data Type Methods.
We use the WITH XMLNAMESPACES clause in a statement that also includes a common table expression(CTE). See the output mentioned in Figure1.
Note:
If we don’t use WITH XMLNAMESPACES in query it will return a record with NULL values. If XML do not contain any namespace then it doesn’t require to add WITH XMLNAMESPACES.
Output
Figure1: Output of XML Data
Conclusion
In this blog we discussed how to read data when XML contains Namespace tag. Using WITH XMLNAMESPACES we can generate XML data with namespace tag through “For XML RAW”.
Reference