Is there a way to execute xquery code, using marklogic java api.. Basically I want to get the size of a given file and in xquery I could just do the following
return xdmp:binary-size(fn:doc($uri)/binary())
Is there an easy way to do this using Java API ? or can we execute random xquery code using java API ?
Yes, you have the ServerEvaluationCall which enables both eval and invoke. However, they require special privileges. Eval is particularly dangerous because it opens up security risks when you send ad-hoc code from the client that might contain an injection attack.
Instead we recommend that you install and use a custom resource extension.
You are probably looking for this: Execute ad-hoc code on the server- with data mapped automatically to/from MarkLogic. https://docs.marklogic.com/guide/java/resourceservices#id_47102
Take it for a test drive - looks like it suits your needs.
You also have the robust resource service extension options: https://docs.marklogic.com/guide/java/resourceservices#id_27702
My absolute favourite is this: https://docs.marklogic.com/guide/java/resourceservices#id_84134 Full module execution on MarkLogic with injected variables - with data mapped automatically to/from MarkLogic
We use this option as follows:
Its a bit more complex in real life(including security and per/post execution auditing), but certainly a pattern that can help you by keeping control over your xQuery/JS code and not allow injection of arbitrary code execution (because you execute only functions for which the connected user has rights to use).
