How can we update some nodes in an xml column? - sql-server

Question

I have the below in an xml column of a table. How can I write a query that replaces only part of the value for all ? The text REPLACE will be replaced with another value.
<Root>
<Response xmlns:ns1="urn:names:tc:legalxml-message1:schema:xsd:Message-4.0">
<Message xmlns:ns2="urn:names:tc:legalxml-message2:schema:xsd:Types-4.0">
<Response1>
<ns1:Name>REPLACE name1</Name>
</Response1>
<Response2>
<ns1:Name>REPLACE name2</Name>
</Response2>
<Response3>
<ns1:Name>REPLACE name3</Name>
</Response3>
<Response4>
<ns1:Name>REPLACE name4</Name>
</Response4>
</Message>
</Response>
</Root>
I tried the below query and received an error message.
XQuery [r.x.modify()]: The target of 'replace value of' must be a non-metadata attribute or an element with simple typed content, found 'element(Name,xdt:untyped) ?'
I was following this link.
declare #SearchString varchar(100),#ReplaceString varchar(100)
SELECT #SearchString = 'REPLACE',#ReplaceString = 'NEWVALUE'
UPDATE r
SET x.modify('replace value of (/Root/Response/Message/Response1/Name)[1] with sql:column("y")')
FROM (SELECT xmlColumn,REPLACE(t.u.value('Name[1]','varchar(100)'),#SearchString,#ReplaceString) as y
FROM tblMessage
CROSS APPLY tblMessage.nodes('/Root/Response/Message/Response1/Name')t(u)
)r

Answer 1

Given the following sample data:
DECLARE #xml XML =
'<Root>
<Response xmlns:ns1="urn:names:tc:legalxml-message1:schema:xsd:Message-4.0">
<Message xmlns:ns2="urn:names:tc:legalxml-message2:schema:xsd:Types-4.0">
<Response1>
<ns1:Name>REPLACE name1</ns1:Name>
</Response1>
<Response2>
<ns1:Name>REPLACE name2</ns1:Name>
</Response2>
<Response3>
<ns1:Name>REPLACE name3</ns1:Name>
</Response3>
<Response4>
<ns1:Name>REPLACE name4</ns1:Name>
</Response4>
</Message>
</Response>
</Root>';
DECLARE #replaceText VARCHAR(100) = 'Something New Here';
You can use the XML modify method to update the values. To do so explicitly by node name you could do this:
SET #xml.modify('replace value of (/Root/Response/Message/Response4/*:Name/text())[1]
with sql:variable("#replaceText")');
In this ^^ example I'm updating the Response4 node. You can also use the node position to update the XML. The example below will update Response1:
SET #xml.modify('replace value of (/Root/Response/Message//*:Name/text())[1]
with sql:variable("#replaceText")');
To update Response2 you would do change the [1] to [2] like so:
SET #xml.modify('replace value of (/Root/Response/Message//*:Name/text())[2]
with sql:variable("#replaceText")');