[BTS] Use TSQL to query a XML field in SQLServer

When deploy BizTalk application. I often save XML message to database.

When display some field in XML, I need following SQL to query XML field.

starttime,

select

convert(xml,RequestXML).value('(//GENERALDATA/SERIAL_NO)[1]','varchar(30)') SERIAL_NO

from BizTalkTask

where interfaceid=10001

order by id desc

select

starttime,

convert(xml,RequestXML).query('//GENERALDATA/SERIAL_NO') XmlNode

from BizTalkTask

where interfaceid=10001

order by id desc

An anther sample:

SELECT x.requestpayload.value('declare namespace s="http://blah.ca/api"; (/s:validate-student-request/s:student-id)[1]', 'int') as studentidFROM xoutput x

<XmlColumn>.value('...namespace....; (...xPath...)[1]', 'Type') as ColumnAlias

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