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Posted to commits@cayenne.apache.org by "Andrus Adamchik (Jira)" <ji...@apache.org> on 2026/05/30 23:06:00 UTC

[jira] [Closed] (CAY-2955) Get rid of QueryEngine abstraction

     [ https://issues.apache.org/jira/browse/CAY-2955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrus Adamchik closed CAY-2955.
--------------------------------
    Resolution: Fixed

> Get rid of QueryEngine abstraction
> ----------------------------------
>
>                 Key: CAY-2955
>                 URL: https://issues.apache.org/jira/browse/CAY-2955
>             Project: Cayenne
>          Issue Type: Task
>            Reporter: Andrus Adamchik
>            Assignee: Andrus Adamchik
>            Priority: Minor
>             Fix For: 5.0-M2
>
>
> QueryEngine interface is not that useful. Cayenne is all about relational databases, and the original abstraction allowed to replace DataNode with a non-JDBC backend (like LDAP or NoSQL). We really don't care about this anymore (and I am not aware of anyone actually doing it). So let's unwind it:
> * DataDomain wasn't a true QueryEngine, so drop its implementation and deprecate "performQueries()"
> * Replace uses of QueryEngine with DataNode. 
> * remove QueryEngine
> Upgrade notes: If somebody really implemented a custom QueryEngine, they can try subclassing DataNode and overriding "performQueries()". It won't be as pretty, but such an extension is still possible.
>  
>  



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