Tobias, sounds like an issue in Trac regarding the String node-sorting utility. you or me?
/peter GTalk: neubauer.peter Skype peter.neubauer ICQ 18762544 Phone +46704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - New Energy for Data - the Graph Database. http://www.ops4j.org - New Energy for OSS Communities - Open Participation Software. http://www.qi4j.org - New Energy for Java - Domain Driven Development. On Wed, Aug 13, 2008 at 9:37 AM, Tobias Ivarsson <[EMAIL PROTECTED]> wrote: > On Wed, Aug 13, 2008 at 8:51 AM, Nils Kaiser <[EMAIL PROTECTED]> wrote: > >> Comments inline. >> >> Johan Svensson schrieb: >> >> A part I am struggeling with in the design of the app, is that the UI >> >> should support viewing of very large collections, for example all email >> >> messages in "work" collection. These will have to be sortable by >> >> different fields, in case of a mail message even sorting by the name of >> >> the contact (which needs to follow a relationship). I don't really know >> >> how to use Neo4j (or another persistence mechanism, or another layer on >> >> top of Neo4j) to implement such functionality. >> >> >> >> >> > >> > This can either be solved by reading in the full collection (using a >> > traverser) then sort it or keep the items sorted in the node space >> > (using linked lists like Timeline utility in index-util component). >> > >> Are there some examples of this somewhere? Or maybe something I might >> use to leverage the task? >> >> With a relational DB, I wouldn't have to care as the sorting could be >> made by the database. I could then use a cursor to implement some kind >> of lazy loading in my UI. > > > Yeah, and it does it in the same way, either you define that you want the DB > to store a sorted index, or it does the sorting by reading all data and sort > it when you request it. And defining that you want something to be sorted in > Neo is by using the index-utils to define sorted datastructures. Using for > example the timeline is as simple as: > > import org.neo4j.util.timeline.TimelineIndex; > import org.neo4j.util.timeline.Timeline; > > ... > > NeoService neo = ... > Node timelineStartNode = ... > TimelineIndex timeline = new Timeline("Timeline name", timeline, neo); > ... > timeline.addNode(someNode, getSortKeyFromNode(someNode)); > ... > > private long getSortKeyFromNode(Node node) { > .... > } > > For information on how to include index-util in your project, see this > previous thread: > http://lists.neo4j.org/pipermail/user/2008-August/000666.html > > >> I guess the solution to sort the objects as a >> linked list has the disadvantage not to be able to sort on multiple fields. > > > Well, the same object could be contained in more than one list... > >> >> >> Would lucene help here? >> _______________________________________________ >> Neo mailing list >> User@lists.neo4j.org >> https://lists.neo4j.org/mailman/listinfo/user >> > > > A note to my fellow Neo developers: > It could be a good idea to create some sorted structure that keeps nodes > sorted based on a String, since this is quite a common use case. > > -- > Tobias Ivarsson <[EMAIL PROTECTED]> > Hacker, Neo Technology > www.neotechnology.com > Cellphone: +46 706 534857 > _______________________________________________ > Neo mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
