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From Michael Dürig (Commented) (JIRA) <j...@apache.org>
Subject [jira] [Commented] (OAK-34) Define query API
Date Tue, 03 Apr 2012 11:16:24 GMT

    [ https://issues.apache.org/jira/browse/OAK-34?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245134#comment-13245134

Michael Dürig commented on OAK-34:

* Currently the query needs to be parsed twice. Once in QueryEngine.getBindVariableNames()
and a second time in QueryEngine.executeQuery(). Why not change this into QueryEngine.prepare()
and QueryEngine.execute()? The prepare() method would return a pre-parsed query and provide
means to bind the free variables. The execute() method would simple execute such a query.
If we factor the pre-parsed query into an interface, we would at the same time get extensibility:
clients could build queries for their own languages and pass them directly to the execute()
method without going through prepare().

* Naming: Result and ResultRow should have more specific names. I propose QueryResult which
has an inner interface called Row. 

* Result.getRows() should probably return an Iterable instead of an Iterator. 

* Maybe Result.getRows() should allow for specifying offset and limit. 

> Define query API
> ----------------
>                 Key: OAK-34
>                 URL: https://issues.apache.org/jira/browse/OAK-34
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: core
>            Reporter: Michael Dürig
>              Labels: query
> Define a oak-core API for handling queries. How do we handle name space mappings, value
bindings, limit, offset, access rights. See OAK-28

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