We've never used the "CREATE LINK..." stuff, but it does seem curious that it doesn't support many-to-one since obviously the underlying data model supports it effortlessly.
re: using edges, we've done several projects with the graph model, I generally like it better but of course it's not necessarily a great fit for every use-case, take a look at orient's comparison here: https://github.com/orientechnologies/orientdb/wiki/Choosing-between-Graph-or-Document-API On Tuesday, January 6, 2015 7:55:28 PM UTC-7, spareshade wrote: > > Thanks Luca ... > must say orientdb is just awesome !!! > > the example is the People / Address where People can work/live at the same > Address; so the Address Id is unique for each address, while multiple > People hold the same Address Id. > What I want is for People to link to Address @rid (via Address Id that a > person is referencing), are you saying that this is not possible via CREATE > LINK? > > It works fine using Keith's approach, ie. setting the address' @rid link > in person's record. > > I'm aware that perhaps edges might be a better solution, but we're still > just testing things out :) ... > > > > On Wednesday, January 7, 2015 5:29:00 AM UTC+11, Lvc@ wrote: >> >> The CREATE LINK command want unique key, but the value " >> 2831b7f5-28ba-457d-b871-21be494f509c" is in more than 1 record in >> database, so it can't create the LINK. >> >> Lvc@ >> >> >> On 6 January 2015 at 18:38, Keith Freeman <8fo...@gmail.com> wrote: >> >>> This works for me: >>> import com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx; >>> import com.orientechnologies.orient.core.record.impl.ODocument; >>> >>> public class O2DocumentHW >>> { >>> public static void main(String[] args) >>> { >>> long start = System.currentTimeMillis(); >>> >>> try (ODatabaseDocumentTx db = new >>> ODatabaseDocumentTx("remote:localhost/testdb")) >>> { >>> db.open("admin", "admin"); >>> db.begin(); >>> >>> try >>> { >>> ODocument target = new ODocument("doc").field("name", >>> "target"); >>> >>> ODocument src1 = new ODocument("doc").field("name", >>> "src1").field("shoots", target); >>> ODocument src2 = new ODocument("doc").field("name", >>> "src2").field("shoots", target); >>> ODocument src3 = new ODocument("doc").field("name", >>> "src3").field("shoots", target); >>> >>> target.save(); >>> src1.save(); >>> src2.save(); >>> src3.save(); >>> db.commit(); >>> } >>> catch (Exception ex) >>> { >>> try >>> { >>> db.rollback(); >>> } >>> catch (Exception ex1) >>> { >>> System.err.println("rollback exception! " + ex); >>> } >>> >>> System.err.println("commit exception! " + ex); >>> ex.printStackTrace(System.err); >>> } >>> finally >>> { >>> db.close(); >>> } >>> >>> System.out.println("done in " + (System.currentTimeMillis() >>> - start) + "ms"); >>> } >>> catch (Exception ex) >>> { >>> System.err.println("open exception! " + ex); >>> ex.printStackTrace(System.err); >>> } >>> } >>> } >>> >>> >>> Then the query shows many-to-one: >>> >>> >>> <https://lh5.googleusercontent.com/-qd7ZAb3zmoY/VKwdc9TRgeI/AAAAAAAACdc/aa6OQehdNqE/s1600/Screenshot%2Bfrom%2B2015-01-06%2B10%3A37%3A26.png> >>> >>> >>> On Tuesday, January 6, 2015 12:41:31 AM UTC-7, spareshade wrote: >>>> >>>> Hello all >>>> >>>> I am getting and error when trying to establish many to one links >>>> >>>> com.orientechnologies.orient.core.exception.OCommandExecutionException: >>>> Cannot create link because multiple records was found in class >>>> 'LinkingClass' with value '2831b7f5-28ba-457d-b871-21be494f509c' in >>>> field 'linkingToClassId' >>>> >>>> so I assume this is not possible. >>>> >>>> Any thoughts would be welcome :) >>>> >>> -- >>> >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "OrientDB" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to orient-databa...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- --- You received this message because you are subscribed to the Google Groups "OrientDB" group. To unsubscribe from this group and stop receiving emails from it, send an email to orient-database+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
