org.neo4j.graphdb.Node.getGraphDatabase()方法的使用及代码示例

x33g5p2x  于2022-01-24 转载在 其他  
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本文整理了Java中org.neo4j.graphdb.Node.getGraphDatabase()方法的一些代码示例，展示了Node.getGraphDatabase()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Node.getGraphDatabase()方法的具体详情如下：
包路径：org.neo4j.graphdb.Node
类名称：Node
方法名：getGraphDatabase

Node.getGraphDatabase介绍

暂无

代码示例

代码示例来源：origin: neo4j/neo4j

  1. private void resolveMonitor( Node node )
  2. {
  3.   if ( dataMonitor == null )
  4.   {
  5.     GraphDatabaseService service = node.getGraphDatabase();
  6.     if ( service instanceof GraphDatabaseFacade )
  7.     {
  8.       Monitors monitors = ((GraphDatabaseFacade) service).getDependencyResolver().resolveDependency( Monitors.class );
  9.       dataMonitor = monitors.newMonitor( DataMonitor.class );
  10.     }
  11.   }
  12. }

代码示例来源：origin: neo4j/neo4j

  1. private Relationship createRelationship( Node node )
  2. {
  3.   try ( Transaction tx = node.getGraphDatabase().beginTx() )
  4.   {
  5.     Relationship rel = node.createRelationshipTo( node, MyRelTypes.TEST );
  6.     tx.success();
  7.     return rel;
  8.   }
  9. }

代码示例来源：origin: neo4j/neo4j

  1. @PluginTarget( Node.class )
  2. public Node getThisNodeOrById( @Source Node start, @Parameter( name = "id", optional = true ) Long id )
  3. {
  4.   optional = id;
  5.   if ( id == null )
  6.   {
  7.     return start;
  8.   }
  9.   try ( Transaction tx = start.getGraphDatabase().beginTx() )
  10.   {
  11.     Node node = start.getGraphDatabase().getNodeById( id );
  12.     tx.success();
  13.     return node;
  14.   }
  15. }

代码示例来源：origin: neo4j/neo4j

  1. public static void destroy( Map<String, Node> nodes )
  2. {
  3.   if ( nodes.isEmpty() )
  4.   {
  5.     return;
  6.   }
  7.   GraphDatabaseService db = nodes.values().iterator().next().getGraphDatabase();
  8.   try ( Transaction tx = db.beginTx() )
  9.   {
  10.     for ( Node node : db.getAllNodes() )
  11.     {
  12.       for ( Relationship rel : node.getRelationships() )
  13.       {
  14.         rel.delete();
  15.       }
  16.       node.delete();
  17.     }
  18.     tx.success();
  19.   }
  20. }

代码示例来源：origin: neo4j/neo4j

  1. void setProperty( String nodeName, String propertyName, Object propertyValue )
  2. {
  3.   Node i = this.getNode( nodeName );
  4.   GraphDatabaseService db = i.getGraphDatabase();
  5.   try ( Transaction tx = db.beginTx() )
  6.   {
  7.     i.setProperty( propertyName, propertyValue );
  8.     tx.success();
  9.   }
  10. }

代码示例来源：origin: neo4j/neo4j

  1. @PluginTarget( Node.class )
  2. public Node getThisNodeOrById( @Source Node start, @Parameter( name = "id", optional = true ) Long id )
  3. {
  4.   optional = id;
  5.   if ( id == null )
  6.   {
  7.     return start;
  8.   }
  9.   return start.getGraphDatabase()
  10.       .getNodeById( id );
  11. }

代码示例来源：origin: neo4j/neo4j

  1. @PluginTarget( Node.class )
  2. public Iterable<Relationship> getRelationshipsBetween( @Source final Node start,
  3.     @Parameter( name = "other" ) final Node end )
  4. {
  5.   List<Relationship> result = new ArrayList<>();
  6.   try ( Transaction tx = start.getGraphDatabase().beginTx() )
  7.   {
  8.     for ( Relationship relationship : start.getRelationships() )
  9.     {
  10.       if ( relationship.getOtherNode( start ).equals( end ) )
  11.       {
  12.         result.add( relationship );
  13.       }
  14.     }
  15.     tx.success();
  16.   }
  17.   return result;
  18. }

代码示例来源：origin: neo4j/neo4j

  1. @PluginTarget( Node.class )
  2. public Iterable<Relationship> createRelationships( @Source Node start,
  3.     @Parameter( name = "type" ) RelationshipType type, @Parameter( name = "nodes" ) Iterable<Node> nodes )
  4. {
  5.   List<Relationship> result = new ArrayList<>();
  6.   try ( Transaction tx = start.getGraphDatabase().beginTx() )
  7.   {
  8.     for ( Node end : nodes )
  9.     {
  10.       result.add( start.createRelationshipTo( end, type ) );
  11.     }
  12.     tx.success();
  13.   }
  14.   return result;
  15. }

代码示例来源：origin: neo4j/neo4j

  1. @Name( GET_CONNECTED_NODES )
  2. @PluginTarget( Node.class )
  3. public Iterable<Node> getAllConnectedNodes( @Source Node start )
  4. {
  5.   ArrayList<Node> nodes = new ArrayList<>();
  6.   try ( Transaction tx = start.getGraphDatabase().beginTx() )
  7.   {
  8.     for ( Relationship rel : start.getRelationships() )
  9.     {
  10.       nodes.add( rel.getOtherNode( start ) );
  11.     }
  12.     tx.success();
  13.   }
  14.   return nodes;
  15. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2. protected Traverser instantiateTraverser( Node start, Node end )
  3. {
  4.   GraphDatabaseService db = start.getGraphDatabase();
  5.   TraversalDescription sideBase = db.traversalDescription().breadthFirst().uniqueness( NODE_PATH );
  6.   return db.bidirectionalTraversalDescription().mirroredSides( sideBase.expand( expander ) )
  7.     .sideSelector( LEVEL_STOP_DESCENT_ON_RESULT, maxDepth )
  8.     .collisionEvaluator( toDepth( maxDepth ) )
  9.     .traverse( start, end );
  10. }

代码示例来源：origin: neo4j/neo4j

  1. @PluginTarget( Node.class )
  2. public Iterable<Relationship> createRelationships( @Source Node start,
  3.     @Parameter( name = "type" ) RelationshipType type, @Parameter( name = "nodes" ) Iterable<Node> nodes )
  4. {
  5.   List<Relationship> result = new ArrayList<>();
  6.   try ( Transaction tx = start.getGraphDatabase().beginTx() )
  7.   {
  8.     for ( Node end : nodes )
  9.     {
  10.       result.add( start.createRelationshipTo( end, type ) );
  11.     }
  12.     tx.success();
  13.   }
  14.   return result;
  15. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2. void extraData( MappingSerializer serializer )
  3. {
  4.   if ( !isDeleted() )
  5.   {
  6.     MappingWriter writer = serializer.writer;
  7.     MappingWriter properties = writer.newMapping( RepresentationType.PROPERTIES, "data" );
  8.     new PropertiesRepresentation( node ).serialize( properties );
  9.     if ( writer.isInteractive() )
  10.     {
  11.       serializer.putList( "relationship_types", ListRepresentation.relationshipTypes(
  12.           node.getGraphDatabase().getAllRelationshipTypes() ) );
  13.     }
  14.     properties.done();
  15.   }
  16. }

代码示例来源：origin: neo4j/neo4j

  1. private static Function<Node,StartRelationship> incoming( String type )
  2. {
  3.   return node ->
  4.   {
  5.     GraphDatabaseService db = node.getGraphDatabase();
  6.     RelationshipType relType = withName( type );
  7.     return new StartRelationship(
  8.         db.createNode().createRelationshipTo( node, relType ).getId(),
  9.         Direction.INCOMING,
  10.         relType );
  11.   };
  12. }

代码示例来源：origin: neo4j/neo4j

  1. private static Function<Node,StartRelationship> outgoing( String type )
  2. {
  3.   return node ->
  4.   {
  5.     GraphDatabaseService db = node.getGraphDatabase();
  6.     RelationshipType relType = withName( type );
  7.     return new StartRelationship(
  8.         node.createRelationshipTo( db.createNode(), relType ).getId(),
  9.         Direction.OUTGOING,
  10.         relType );
  11.   };
  12. }

代码示例来源：origin: neo4j/neo4j

  1. private Relationship getFirstRelationshipFromRomeoNode()
  2. {
  3.   Node romeo = getNode( "Romeo" );
  4.   try ( Transaction transaction = romeo.getGraphDatabase().beginTx() )
  5.   {
  6.     ResourceIterable<Relationship> relationships = (ResourceIterable<Relationship>) romeo.getRelationships();
  7.     try ( ResourceIterator<Relationship> iterator = relationships.iterator() )
  8.     {
  9.       return iterator.next();
  10.     }
  11.   }
  12. }

代码示例来源：origin: neo4j/neo4j

  1. @PluginTarget( Node.class )
  2.   public Path pathToReference( @Source Node me )
  3.   {
  4.     PathFinder<Path> finder = GraphAlgoFactory.shortestPath( PathExpanders.allTypesAndDirections(), 6 );
  5.     return finder.findSinglePath( me.getGraphDatabase()
  6.         .createNode(), me );
  7.   }
  8. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   protected Traverser instantiateTraverser( Node start, Node end )
  3.   {
  4.     // Bidirectional traversal
  5.     GraphDatabaseService db = start.getGraphDatabase();
  6.     TraversalDescription base = db.traversalDescription().depthFirst().uniqueness( uniqueness() );
  7.     return db.bidirectionalTraversalDescription()
  8.         .startSide( base.expand( expander ).evaluator( toDepth( maxDepth / 2 ) ) )
  9.         .endSide( base.expand( expander.reverse() ).evaluator( toDepth( maxDepth - maxDepth / 2 ) ) )
  10.         .traverse( start, end );
  11.   }
  12. }

代码示例来源：origin: neo4j/neo4j

  1. private ResourceIterable<WeightedPath> findPaths( Node start, Node end, boolean multiplePaths )
  2. {
  3.   PathInterest interest;
  4.   if ( multiplePaths )
  5.   {
  6.     interest = stopAfterLowestWeight ? PathInterestFactory.allShortest() : PathInterestFactory.all();
  7.   }
  8.   else
  9.   {
  10.     interest = PathInterestFactory.single();
  11.   }
  12.   GraphDatabaseService db = start.getGraphDatabase();
  13.   TraversalDescription traversalDescription = db.traversalDescription().uniqueness( Uniqueness.NONE )
  14.       .expand( expander, initialState );
  15.   lastTraverser = traversalDescription.order(
  16.       new SelectorFactory( end, interest ) )
  17.       .evaluator( includeWhereEndNodeIs( end ) )
  18.       .traverse( start );
  19.   return Iterators.asResourceIterable(
  20.       new WeightedPathIterator( lastTraverser.iterator(), costEvaluator, stopAfterLowestWeight ) );
  21. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. @Graph( "I know you" )
  3. public void get_Relationship_by_ID() throws JsonParseException
  4. {
  5.   Node node = data.get().get( "I" );
  6.   Relationship relationship;
  7.   try ( Transaction transaction = node.getGraphDatabase().beginTx() )
  8.   {
  9.     relationship = node.getSingleRelationship(
  10.         RelationshipType.withName( "know" ),
  11.         Direction.OUTGOING );
  12.   }
  13.   String response = gen().expectedStatus(
  14.       com.sun.jersey.api.client.ClientResponse.Status.OK.getStatusCode() ).get(
  15.       getRelationshipUri( relationship ) ).entity();
  16.   assertTrue( JsonHelper.jsonToMap( response ).containsKey( "start" ) );
  17. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   protected Traverser instantiateTraverser( Node start, Node end )
  3.   {
  4.     GraphDatabaseService db = start.getGraphDatabase();
  5.     TraversalDescription side =
  6.         db.traversalDescription().breadthFirst().uniqueness( uniqueness ).order(
  7.             ( startSource, expander ) -> new LiteDepthFirstSelector( startSource, startThreshold, expander ) );
  8.     return db.bidirectionalTraversalDescription().startSide( side.expand( expander ).evaluator( toDepth( onDepth / 2 ) ) )
  9.         .endSide( side.expand( expander.reverse() ).evaluator( toDepth( onDepth - onDepth / 2 ) ) )
  10.         .collisionEvaluator( atDepth( onDepth ) )
  11.         // TODO Level side selector will make the traversal return wrong result, why?
  12.         //                .sideSelector( SideSelectorPolicies.LEVEL, onDepth )
  13.         .traverse( start, end );
  14.   }
  15. }

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