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From <Sascha.The...@bosch-si.com>
Subject Several questions regarding the JCR API and Jackrabbit
Date Tue, 03 Apr 2012 08:20:38 GMT
Hi all,


I have a few questions about the JCR API and the internals of Jackrabbit
and I didn`t find an answer neither in the specification nor in the
Jackrabbit wiki:


1)      How do I query for nodes with distinct property values? Imagine
I have couple of nodes with the same property value and I want to query
only for the distinct property values.

2)      How do I get the last version (version name is unknown) in a
version history directly without iterating over ALL versions?

a.       I tried something like: versionHistory.getVersion("1." +
(allVersionsSize - 2)) but that seems to be very ugly and I am asking if
there is no cleaner way to do this?

3)      How do I get the total amount of a QueryResult? Currently I am
casting the QueryResult to QueryResultImpl and retrieve the total amount
from there but that seems to only work for XPath queries. When using
SQL2 queries you get another QueryResult which doesn`t offer the
getTotalSize() method.

4)      When should we completely switch to SQL2 syntax with our
queries? I saw that XPath is deprecated but still highly used in

5)      If I have multiple workspaces within my repository they are
sharing all the same VersionStorage. How do I know to which workspace a
specific version in the version history belongs to? Can I query the
VersionStorage for versions contained in a particular workspace?

a.       If I cannot differentiate the data in the VersionStorage, why
is there one global VersionStorage for all workspaces instead of a
VersionStorage per workspace?

6)      If I am using different datasources for version storage and
workspaces, all connected to different database schemas in the same
database, how is transaction safety guaranteed? Only through XA



Thanks for your support!





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