Well, you can set the reference node to anything, so you could do graph.delete(); newRoot = neo4j.createNode(); neo4j.setReferenceNode(newRoot);
Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Mar 2, 2011 at 12:10 PM, Craig Taverner <[email protected]> wrote: > Is this not because blueprints does not respect the neo4j reference node, > and so deletes it (really clears the graph). Is there a way to create the > reference node again? Perhaps as simple as db.createNode(), and the first > will be node 0? > > On Wed, Mar 2, 2011 at 12:08 PM, Peter Neubauer < > [email protected]> wrote: > >> Mmh, >> have you committed the transaction after your clear, and How are you >> trying to create the Relationship? It seems you are trying to use Node >> 0 for it, which you have deleted before? In that case, you need to add >> a new node and use that as the starting point for your relationship? >> >> Cheers, >> >> /peter neubauer >> >> GTalk: neubauer.peter >> Skype peter.neubauer >> Phone +46 704 106975 >> LinkedIn http://www.linkedin.com/in/neubauer >> Twitter http://twitter.com/peterneubauer >> >> http://www.neo4j.org - Your high performance graph database. >> http://startupbootcamp.org/ - Öresund - Innovation happens HERE. >> http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. >> >> >> >> On Wed, Mar 2, 2011 at 11:44 AM, Alfredas Chmieliauskas >> <[email protected]> wrote: >> > Dear all, >> > >> > a crazy primitive question. How do I clear a graph (without doing rm -f) >> ? >> > If I delete all the nodes and relationships or use blueprints >> > graph.clear() I get a weird error later when adding new nodes: >> > >> > Caused by: java.lang.IllegalStateException: First node[0] is deleted >> > and cannot be used to create a relationship >> > at >> org.neo4j.kernel.impl.nioneo.xa.WriteTransaction.relationshipCreate(WriteTransaction.java:1475) >> > at >> org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaConnection$RelationshipEventConsumerImpl.createRelationship(NeoStoreXaConnection.java:257) >> > at >> org.neo4j.kernel.impl.nioneo.xa.NioNeoDbPersistenceSource$NioNeoDbResourceConnection.relationshipCreate(NioNeoDbPersistenceSource.java:371) >> > at >> org.neo4j.kernel.impl.persistence.PersistenceManager.relationshipCreate(PersistenceManager.java:154) >> > at >> org.neo4j.kernel.impl.core.NodeManager.createRelationship(NodeManager.java:310) >> > at >> org.neo4j.kernel.impl.core.NodeImpl.createRelationshipTo(NodeImpl.java:388) >> > at >> org.neo4j.kernel.impl.core.NodeProxy.createRelationshipTo(NodeProxy.java:187) >> > at >> org.neo4j.util.GraphDatabaseUtil.getOrCreateSingleOtherNode(GraphDatabaseUtil.java:137) >> > at >> org.neo4j.util.GraphDatabaseUtil.getOrCreateSubReferenceNode(GraphDatabaseUtil.java:167) >> > at >> org.neo4j.util.GraphDatabaseUtil.getOrCreateSubReferenceNode(GraphDatabaseUtil.java:150) >> > at >> org.springframework.data.graph.neo4j.support.GraphDatabaseContext.getOrCreateSubReferenceNode(GraphDatabaseContext.java:275) >> > at >> org.springframework.data.graph.neo4j.support.SubReferenceNodeTypeStrategy.obtainSubreferenceNode(SubReferenceNodeTypeStrategy.java:167) >> > at >> org.springframework.data.graph.neo4j.support.SubReferenceNodeTypeStrategy.postEntityCreation(SubReferenceNodeTypeStrategy.java:66) >> > at >> org.springframework.data.graph.neo4j.support.GraphDatabaseContext.postEntityCreation(GraphDatabaseContext.java:219) >> > at >> org.springframework.data.graph.neo4j.fieldaccess.NodeEntityStateAccessors.createAndAssignState(NodeEntityStateAccessors.java:54) >> > at >> org.springframework.data.graph.neo4j.fieldaccess.DetachableEntityStateAccessors.createAndAssignState(DetachableEntityStateAccessors.java:113) >> > at >> org.springframework.data.graph.neo4j.support.node.Neo4jNodeBacking.ajc$before$org_springframework_data_graph_neo4j_support_node_Neo4jNodeBacking$1$74591ff9(Neo4jNodeBacking.aj:84) >> > >> > Also I'm using Spring Data Graph to create new nodes and relations. >> > >> > Any ideas? >> > >> > Alfredas >> > _______________________________________________ >> > Neo4j mailing list >> > [email protected] >> > https://lists.neo4j.org/mailman/listinfo/user >> > >> _______________________________________________ >> Neo4j mailing list >> [email protected] >> https://lists.neo4j.org/mailman/listinfo/user >> > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
