org.neo4j.graphdb.Node.createRelationshipTo()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.createRelationshipTo()方法的一些代码示例，展示了Node.createRelationshipTo()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.createRelationshipTo()方法的具体详情如下：
包路径：org.neo4j.graphdb.Node
类名称：Node
方法名：createRelationshipTo

Node.createRelationshipTo介绍

[英]Creates a relationship between this node and another node. The relationship is of type type. It starts at this node and ends at otherNode.

A relationship is equally well traversed in both directions so there's no need to create another relationship in the opposite direction (in regards to traversal or performance).
[中]在该节点和另一个节点之间创建关系。关系的类型为type。它从该节点开始，在otherNode结束。
一个关系在两个方向上都被很好地遍历，因此不需要在相反方向上创建另一个关系（关于遍历或性能）。

代码示例

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   public Relationship create()
  3.   {
  4.     return db.createNode().createRelationshipTo( db.createNode(), type );
  5.   }
  6. };

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   protected Relationship obtainEntityInTransaction( GraphDatabaseService graphDatabaseService )
  3.   {
  4.     return graphDatabaseService
  5.         .createNode()
  6.         .createRelationshipTo( graphDatabaseService.createNode(), withName( "foo" ) );
  7.   }
  8. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   public Long apply( GraphDatabaseService graphDb )
  3.   {
  4.     try ( Transaction tx = graphDb.beginTx() )
  5.     {
  6.       Node node = graphDb.createNode();
  7.       node.createRelationshipTo( graphDb.createNode(), withName( "KNOWS" ) );
  8.       node.createRelationshipTo( graphDb.createNode(), withName( "KNOWS" ) );
  9.       long whatThisThreadSees = countsForRelationship( null, null, null );
  10.       barrier.reached();
  11.       tx.success();
  12.       return whatThisThreadSees;
  13.     }
  14.   }
  15. }, graphDb );

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void testFromRelCypherResult()
  3. {
  4.   Node n = gdb.createNode();
  5.   final Relationship rel = n.createRelationshipTo( n, RelationshipType.withName( "REL" ) );
  6.   final ExecutionResult result = result( "rel", rel );
  7.   final SubGraph graph = CypherResultSubGraph.from( result, gdb, true );
  8.   assertEquals( "create (_0)" + lineSeparator() +
  9.       "create (_0)-[:`REL`]->(_0)" + lineSeparator() + ";" + lineSeparator(), doExportGraph( graph ) );
  10. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldOnlyReturnTypeOnce()
  3. {
  4.   // Given
  5.   Node node;
  6.   try ( Transaction tx = db.beginTx() )
  7.   {
  8.     node = db.createNode();
  9.     node.createRelationshipTo( db.createNode(), RelationshipType.withName( "R" ) );
  10.     node.createRelationshipTo( db.createNode(), RelationshipType.withName( "R" ) );
  11.     node.createRelationshipTo( db.createNode(), RelationshipType.withName( "R" ) );
  12.     tx.success();
  13.   }
  14.   // Then
  15.   try ( Transaction tx = db.beginTx() )
  16.   {
  17.     assertThat( Iterables.asList( node.getRelationshipTypes() ),
  18.         equalTo( singletonList( RelationshipType.withName( "R" ) ) ) );
  19.   }
  20. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void testGetRelationshipTypesOnDenseNode()
  3. {
  4.   Node node = getGraphDb().createNode();
  5.   Node otherNode = getGraphDb().createNode();
  6.   for ( int i = 0; i < 300; i++ )
  7.   {
  8.     node.createRelationshipTo( otherNode, RelType.INITIAL );
  9.   }
  10.   testGetRelationshipTypes( node, new HashSet<>( asList( RelType.INITIAL.name() ) ) );
  11. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   protected Relationship create( Map<String, Object> properties )
  3.   {
  4.     assertEquals( value, properties.get( key ) );
  5.     assertEquals( 1, properties.size() );
  6.     return root.createRelationshipTo( graphDatabase().createNode(), type );
  7.   }
  8. };

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. @Before
  2. public void setup()
  3. {
  4.   db = (GraphDatabaseFacade) new TestGraphDatabaseFactory().newImpermanentDatabase();
  5.   try ( Transaction tx = db.beginTx() )
  6.   {
  7.     Node node = db.createNode();
  8.     node.createRelationshipTo( db.createNode(), withName( "a" ) );
  9.     node.createRelationshipTo( db.createNode(), withName( "b" ) );
  10.     relId = node.createRelationshipTo( db.createNode(), withName( "c" ) ).getId();
  11.     tx.success();
  12.   }
  13. }

代码示例来源：origin: neo4j/neo4j

  1. private Node createSomeData()
  2.   {
  3.     try ( Transaction tx = db.beginTx() )
  4.     {
  5.       Node node = db.createNode();
  6.       node.createRelationshipTo( db.createNode(), MyRelTypes.TEST );
  7.       node.createRelationshipTo( db.createNode(), MyRelTypes.TEST2 );
  8.       tx.success();
  9.       return node;
  10.     }
  11.   }
  12. }

代码示例来源：origin: neo4j/neo4j

  1. private void createRelationshipsBetweenNodes( Node source, Node sink,
  2.                          int numberOfRelationships )
  3.   {
  4.     for ( int i = 0; i < numberOfRelationships; i++ )
  5.     {
  6.       source.createRelationshipTo( sink, RelationshipType.withName( "Type" + (i % 4) ) )
  7.           .setProperty( "" + i, i );
  9.     }
  10.   }
  11. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void should_remove_all_data()
  3. {
  4.   try ( Transaction tx = db.beginTx() )
  5.   {
  6.     RelationshipType relationshipType = RelationshipType.withName( "R" );
  7.     Node n1 = db.createNode();
  8.     Node n2 = db.createNode();
  9.     Node n3 = db.createNode();
  10.     n1.createRelationshipTo(n2, relationshipType);
  11.     n2.createRelationshipTo(n1, relationshipType);
  12.     n3.createRelationshipTo(n1, relationshipType);
  13.     tx.success();
  14.   }
  15.   cleanDatabaseContent( db );
  16.   assertThat( nodeCount(), is( 0L ) );
  17. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldNotGetTheSameRelationshipMoreThanOnceWhenAskingForTheSameTypeMultipleTimes()
  3. {
  4.   // given
  5.   Node node = getGraphDb().createNode();
  6.   node.createRelationshipTo( getGraphDb().createNode(), withName( "FOO" ) );
  7.   // when
  8.   long relationships = Iterables.count( node.getRelationships( withName( "FOO" ), withName( "FOO" ) ) );
  9.   // then
  10.   assertEquals( 1, relationships );
  11. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldPrintCypherEsqueRelationshipToString()
  3. {
  4.   // GIVEN
  5.   Node start;
  6.   Node end;
  7.   RelationshipType type = RelationshipType.withName( "NICE" );
  8.   Relationship relationship;
  9.   try ( Transaction tx = db.beginTx() )
  10.   {
  11.     // GIVEN
  12.     start = db.createNode();
  13.     end = db.createNode();
  14.     relationship = start.createRelationshipTo( end, type );
  15.     tx.success();
  16.     // WHEN
  17.     String toString = relationship.toString();
  18.     // THEN
  19.     assertEquals( "(" + start.getId() + ")-[" + type + "," + relationship.getId() + "]->(" + end.getId() + ")",
  20.         toString );
  21.   }
  22. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void canCreateRelationshipBetweenTwoNodesWithLoopsThenDeleteOneOfTheNodesAndItsRelationships()
  3. {
  4.   Node source = getGraphDb().createNode();
  5.   Node target = getGraphDb().createNode();
  6.   source.createRelationshipTo( source, TEST );
  7.   target.createRelationshipTo( target, TEST );
  8.   source.createRelationshipTo( target, TEST );
  9.   newTransaction();
  10.   for ( Relationship rel : target.getRelationships() )
  11.   {
  12.     rel.delete();
  13.   }
  14.   target.delete();
  15. }

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. private static void generateTransaction( GraphDatabaseAPI database )
  2. {
  3.   try ( Transaction transaction = database.beginTx() )
  4.   {
  5.     Node startNode = database.createNode( Label.label( "startNode" ) );
  6.     startNode.setProperty( "key", "value" );
  7.     Node endNode = database.createNode( Label.label( "endNode" ) );
  8.     endNode.setProperty( "key", "value" );
  9.     startNode.createRelationshipTo( endNode, RelationshipType.withName( "connects" ) );
  10.     transaction.success();
  11.   }
  12. }

代码示例来源：origin: neo4j/neo4j

  1. private void createRelationshipsOnNode( GraphDatabaseService db, Node root, int numberOfRelationships )
  2. {
  3.   for ( int i = 0; i < numberOfRelationships; i++ )
  4.   {
  5.     root.createRelationshipTo( db.createNode(), RelationshipType.withName( "Type" + (i % 4) ) )
  6.         .setProperty( "" + i, i );
  7.   }
  8. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2. public Relationship create( Object... properties )
  3. {
  4.   Relationship rel = graphDb.createNode().createRelationshipTo( graphDb.createNode(), TEST_TYPE );
  5.   setProperties( rel, properties );
  6.   return rel;
  7. }

代码示例来源：origin: neo4j/neo4j

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

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