Update XML stored in a XML column in SQL Server Update - sql-server

Question

Set Url value by applying filter based on location-type value from given sample.
<page id="{Page_ID}" name="" type="dat" size="0" sequence="26" originalpagenumber="26" location_type="3" location="">
<content description="" content_format="26" />
<AdditionalInfo>
<Url>https://s3-eu-west-1/2019/may//001063/gvb140/683c82a3-b3f5-49ee-a34e-01859e8e2228.mp3</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>

Answer 1

The XML you've shared is invalid so I've taken the liberty to make it valid in an effort to show you how I might approach this.
I've made the assumption you're looking to update values in a table somewhere in your environment. You can run this example in SSMS.
THIS IS MEANT AS AN EXAMPLE ONLY. DO NOT BLINDLY RUN THIS AGAINST PRODUCTION DATA.
First, I created a mock-up table that holds some page XML data. I assumed that a single XML row could contain multiple page nodes with duplicate location_type values.
DECLARE #Pages TABLE ( page_xml XML );
INSERT INTO #Pages ( page_xml ) VALUES (
'<pages>
<page id="{Page_ID}" name="" type="dat" size="0" sequence="26" originalpagenumber="26" location_type="3" location="">
<content description="" content_format="26" />
<AdditionalInfo>
<Url>https://s3-eu-west-1/2019/may//001063/gvb140/683c82a3-b3f5-49ee-a34e-01859e8e2228.mp3</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>
</page>
<page id="{Page_ID}" name="" type="dat" size="0" sequence="27" originalpagenumber="27" location_type="3" location="">
<content description="" content_format="27" />
<AdditionalInfo>
<Url>https://s3-eu-west-1/2019/may//001063/gvb140/683c82a3-b3f5-49ee-a34e-01859e8e2228.mp3</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>
</page>
<page id="{Page_ID}" name="" type="dat" size="0" sequence="28" originalpagenumber="28" location_type="8" location="">
<content description="" content_format="28" />
<AdditionalInfo>
<Url>https://s3-eu-west-1/2019/may//001063/gvb140/683c82a3-b3f5-49ee-a34e-01859e8e2228.mp3</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>
</page>
</pages>' );
Selecting the current results from #Pages shows the following XML:
<pages>
<page id="{Page_ID}" name="" type="dat" size="0" sequence="26" originalpagenumber="26" location_type="3" location="">
<content description="" content_format="26" />
<AdditionalInfo>
<Url>https://s3-eu-west-1/2019/may//001063/gvb140/683c82a3-b3f5-49ee-a34e-01859e8e2228.mp3</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>
</page>
<page id="{Page_ID}" name="" type="dat" size="0" sequence="27" originalpagenumber="27" location_type="3" location="">
<content description="" content_format="27" />
<AdditionalInfo>
<Url>https://s3-eu-west-1/2019/may//001063/gvb140/683c82a3-b3f5-49ee-a34e-01859e8e2228.mp3</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>
</page>
<page id="{Page_ID}" name="" type="dat" size="0" sequence="28" originalpagenumber="28" location_type="8" location="">
<content description="" content_format="28" />
<AdditionalInfo>
<Url>https://s3-eu-west-1/2019/may//001063/gvb140/683c82a3-b3f5-49ee-a34e-01859e8e2228.mp3</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>
</page>
</pages>
There are two pages with a location_type of 3, and one with a location_type of 8.
Next, I declared a few variables which I then used to modify the XML.
DECLARE #type INT = 3, #url VARCHAR(255) = 'http://www.google.com';
/* Update each Url text for the specified location_type */
WHILE EXISTS ( SELECT * FROM #Pages WHERE page_xml.exist( '//pages/page[#location_type=sql:variable("#type")]/AdditionalInfo/Url[text()!=sql:variable("#url")]' ) = 1 )
UPDATE #Pages
SET
page_xml.modify( '
replace value of (//pages/page[#location_type=sql:variable("#type")]/AdditionalInfo/Url/text()[.!=sql:variable("#url")])[1]
with sql:variable("#url")
' );
After running the update the XML now contains:
<pages>
<page id="{Page_ID}" name="" type="dat" size="0" sequence="26" originalpagenumber="26" location_type="3" location="">
<content description="" content_format="26" />
<AdditionalInfo>
<Url>http://www.google.com</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>
</page>
<page id="{Page_ID}" name="" type="dat" size="0" sequence="27" originalpagenumber="27" location_type="3" location="">
<content description="" content_format="27" />
<AdditionalInfo>
<Url>http://www.google.com</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>
</page>
<page id="{Page_ID}" name="" type="dat" size="0" sequence="28" originalpagenumber="28" location_type="8" location="">
<content description="" content_format="28" />
<AdditionalInfo>
<Url>https://s3-eu-west-1/2019/may//001063/gvb140/683c82a3-b3f5-49ee-a34e-01859e8e2228.mp3</Url>
<Name />
<Encoding>audio</Encoding>
<SecurityType>IBCloud</SecurityType>
</AdditionalInfo>
</page>
</pages>
Using the WHILE EXISTS (... ensures that all Url nodes for the requested location_type are updated. In my example here there are two pages with a value of 3 that are updated, while location_type 8 is left alone.
Basically, what this is doing is updating the Url for any page with the requested location_type to the new #url value.
There are two key pieces here, the first being:
.exist( '//pages/page[#location_type=sql:variable("#type")]/AdditionalInfo/Url[text()!=sql:variable("#url")]' )
Which looks for the requested location_type that doesn't have the new #url value.
And the second:
page_xml.modify( '
replace value of (//pages/page[#location_type=sql:variable("#type")]/AdditionalInfo/Url/text()[.!=sql:variable("#url")])[1]
with sql:variable("#url")
' );
Which modifies (updates) the Url for the location type that has yet to be updated. The two "conditions" allow for a loop (WHILE) that ends when they're no longer met, ensuring that all page nodes for the requested location_type are updated.