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Asked: 2026-05-24T21:33:52+00:00

I have a very large xml file which I have stored in a longtext

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I have a very large xml file which I have stored in a longtext field called xml, in a table called imports.

Then I store todays xml string in a user variable called @xml like this.

SELECT xml FROM imports WHERE DATE(updated_at) = DATE(NOW()) INTO @xml;

I can test the user variable and the length of the data is there as expected.

SELECT LENGTH(@xml);

Testing the position of my target xml tag also works as expected.

SELECT LOCATE('sm:ProductCode>', @xml);

However when I try to use the ExtractValue with an XPath query that contains the namespace, I get null. This XPath query is tested and working fine in my XPath exploring software.

SELECT ExtractValue(@xml, '//sm:ProductCode');
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1 Answer

  1. Editorial Team

    It is supported as of 5.1.10:

    Beginning with MySQL 5.1.10, XPath expressions passed as arguments to ExtractValue() and UpdateXML() may contain the colon character (“:”) in element selectors, which enables their use with markup employing XML namespaces notation.

    If your version is older, then there’s nothing you can do, the XPath namespace-uri() function, that you could have used as a workaround, is not supported.

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