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

Node.getId介绍

[英]Returns the unique id of this node. Ids are garbage collected over time so they are only guaranteed to be unique during a specific time span: if the node is deleted, it's likely that a new node at some point will get the old id. Note: This makes node ids brittle as public APIs.
[中]返回此节点的唯一id。id会随着时间的推移被垃圾收集，因此它们只能在特定的时间跨度内被保证是唯一的：如果节点被删除，很可能新节点在某个时候会获得旧id。注意：这使得节点id作为公共API变得脆弱。

代码示例

代码示例来源：origin: neo4j/neo4j

  1. private long initWithNode( GraphDatabaseService db )
  2. {
  3.   try ( Transaction tx = db.beginTx() )
  4.   {
  5.     Node theNode = db.createNode();
  6.     long id = theNode.getId();
  7.     tx.success();
  8.     return id;
  9.   }
  10. }

代码示例来源：origin: neo4j/neo4j

  1. private long nodeWithNoLabel( GraphDatabaseService graphDb, Object value )
  2. {
  3.   Node node = graphDb.createNode();
  4.   node.setProperty( "prop", value );
  5.   return node.getId();
  6. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2.   public void testFromSimpleGraph()
  3.   {
  4.     final Node n0 = gdb.createNode();
  6.     final Node n1 = gdb.createNode();
  7.     n1.setProperty( "name", "Node1" );
  8.     final Relationship relationship = n0.createRelationshipTo( n1, RelationshipType.withName( "REL" ) );
  9.     relationship.setProperty( "related", true );
  10.     final SubGraph graph = DatabaseSubGraph.from( gdb );
  11.     assertEquals( "create (_" + n0.getId() + ")" + lineSeparator() +
  12.         "create (_" + n1.getId() + " {`name`:\"Node1\"})" + lineSeparator() +
  13.         "create (_" + n0.getId() + ")-[:`REL` {`related`:true}]->(_" + n1.getId() + ")" +
  14.           lineSeparator() + ";" + lineSeparator(), doExportGraph( graph ) );
  15.   }
  16. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2.   public void shouldReuseExcessBatchIdsWhichWerentUsedBeforeClose() throws Exception
  3.   {
  4.     // given
  5.     Node firstNode;
  6.     try ( Transaction tx = db.beginTx() )
  7.     {
  8.       firstNode = db.createNode();
  9.       tx.success();
  10.     }
  12.     // when
  13.     db.restartDatabase();
  15.     Node secondNode;
  16.     try ( Transaction tx = db.beginTx() )
  17.     {
  18.       secondNode = db.createNode();
  19.       tx.success();
  20.     }
  22.     // then
  23.     assertEquals( firstNode.getId() + 1, secondNode.getId() );
  24.   }
  25. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldIterateThroughNodesInReverse()
  3. {
  4.   // given
  5.   Path path = new PathProxy( proxySPI, new long[] {1, 2, 3}, new long[] {100, 200}, new int[] {0, ~0} );
  6.   Iterator<Node> iterator = path.reverseNodes().iterator();
  7.   Node node;
  8.   // then
  9.   assertTrue( iterator.hasNext() );
  10.   assertThat( node = iterator.next(), instanceOf( Node.class ) );
  11.   assertEquals( 3, node.getId() );
  12.   assertTrue( iterator.hasNext() );
  13.   assertThat( node = iterator.next(), instanceOf( Node.class ) );
  14.   assertEquals( 2, node.getId() );
  15.   assertTrue( iterator.hasNext() );
  16.   assertThat( node = iterator.next(), instanceOf( Node.class ) );
  17.   assertEquals( 1, node.getId() );
  18.   assertFalse( iterator.hasNext() );
  19. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void mixingBeansApiWithKernelAPI() throws Exception
  3. {
  4.   // 1: Start your transactions through the Beans API
  5.   Transaction transaction = db.beginTx();
  6.   // 2: Get a hold of a KernelAPI transaction this way:
  7.   KernelTransaction ktx = statementContextSupplier.getKernelTransactionBoundToThisThread( true );
  8.   // 3: Now you can interact through both the statement context and the kernel API to manipulate the
  9.   //    same transaction.
  10.   Node node = db.createNode();
  11.   int labelId = ktx.tokenWrite().labelGetOrCreateForName( "labello" );
  12.   ktx.dataWrite().nodeAddLabel( node.getId(), labelId );
  13.   // 4: Commit through the beans API
  14.   transaction.success();
  15.   transaction.close();
  16. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void populatingConstraintMustAcceptDatasetThatGetsUpdatedWithUniqueEntries() throws Exception
  3. {
  4.   // Given
  5.   givenUniqueDataset();
  6.   // When
  7.   Future<?> createConstraintTransaction = applyChangesToPopulatingUpdater(
  8.       d.getId(), a.getId(), setProperty( d, "d1" ) );
  9.   // Then observe that our constraint was created successfully:
  10.   createConstraintTransaction.get();
  11.   // Future.get() will throw an ExecutionException, if the Runnable threw an exception.
  12. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldCreateNode() throws Exception
  3. {
  4.   long node;
  5.   try ( Transaction tx = beginTransaction() )
  6.   {
  7.     node = tx.dataWrite().nodeCreate();
  8.     tx.success();
  9.   }
  10.   try ( org.neo4j.graphdb.Transaction ignore = graphDb.beginTx() )
  11.   {
  12.     assertEquals( node, graphDb.getNodeById( node ).getId() );
  13.   }
  14. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldIncludeNodesCreatedInSameTxInIndexSeek()
  3. {
  4.   // GIVEN
  5.   createNodes( db, LABEL, nonMatching[0], nonMatching[1] );
  6.   MutableLongSet expected = createNodes( db, LABEL, values );
  7.   // WHEN
  8.   MutableLongSet found = new LongHashSet();
  9.   try ( Transaction tx = db.beginTx() )
  10.   {
  11.     expected.add( createNode( db, propertyMap( keys, values ), LABEL ).getId() );
  12.     createNode( db, propertyMap( keys, nonMatching[2] ), LABEL );
  13.     collectNodes( found, indexSeek.findNodes( keys, values, db ) );
  14.   }
  15.   // THEN
  16.   assertThat( found, equalTo( expected ) );
  17. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void indexHitsFromQueryingRemovedDoesNotReturnNegativeCount()
  3. {
  4.   Index<Node> index = nodeIndex( LuceneIndexImplementation.EXACT_CONFIG );
  5.   Node theNode = graphDb.createNode();
  6.   index.remove( theNode );
  7.   try ( IndexHits<Node> hits = index.query( "someRandomKey", theNode.getId() ) )
  8.   {
  9.     assertTrue( hits.size() >= 0 );
  10.   }
  11. }

代码示例来源：origin: neo4j/neo4j

  1. private void assertReadNode( String propValue, long expectedNodeId )
  2.   {
  3.     try ( Transaction tx = db.beginTx() )
  4.     {
  5.       Node node = db.findNode( LABEL_ONE, propKey, propValue );
  6.       assertNotNull( node );
  7.       assertEquals( "node id", expectedNodeId, node.getId() );
  8.       tx.success();
  9.     }
  10.   }
  11. }

代码示例来源：origin: neo4j/neo4j

  1. private void verifyIds( EmbeddedProxySPI actions, long relationshipId, long nodeId1, int typeId, long nodeId2 )
  2. {
  3.   RelationshipProxy proxy = new RelationshipProxy( actions, relationshipId, nodeId1, typeId, nodeId2 );
  4.   assertEquals( relationshipId, proxy.getId() );
  5.   // our mock above is known to return RelationshipTypeToken
  6.   assertEquals( nodeId1, proxy.getStartNode().getId() );
  7.   assertEquals( nodeId1, proxy.getStartNodeId() );
  8.   assertEquals( nodeId2, proxy.getEndNode().getId() );
  9.   assertEquals( nodeId2, proxy.getEndNodeId() );
  10.   assertEquals( nodeId2, proxy.getOtherNode( nodeWithId( nodeId1 ) ).getId() );
  11.   assertEquals( nodeId2, proxy.getOtherNodeId( nodeId1 ) );
  12.   assertEquals( nodeId1, proxy.getOtherNode( nodeWithId( nodeId2 ) ).getId() );
  13.   assertEquals( nodeId1, proxy.getOtherNodeId( nodeId2 ) );
  14. }

代码示例来源：origin: neo4j/neo4j

  1. private long createNode( Map<String, Object> properties, Label... labels )
  2. {
  3.   try ( org.neo4j.graphdb.Transaction tx = db.beginTx() )
  4.   {
  5.     Node node = db.createNode( labels );
  6.     for ( Map.Entry<String,Object> property : properties.entrySet() )
  7.     {
  8.       node.setProperty( property.getKey(), property.getValue() );
  9.     }
  10.     tx.success();
  11.     return node.getId();
  12.   }
  13. }

代码示例来源：origin: neo4j/neo4j

  1. public MutableLongSet createNodes( GraphDatabaseService db, Label label, Object[]... propertyValueTuples )
  2. {
  3.   MutableLongSet expected = new LongHashSet();
  4.   try ( Transaction tx = db.beginTx() )
  5.   {
  6.     for ( Object[] valueTuple : propertyValueTuples )
  7.     {
  8.       expected.add( createNode( db, propertyMap( keys, valueTuple ), label ).getId() );
  9.     }
  10.     tx.success();
  11.   }
  12.   return expected;
  13. }

代码示例来源：origin: neo4j/neo4j

  1. private long createNode()
  2. {
  3.   long node;
  4.   try ( org.neo4j.graphdb.Transaction ctx = graphDb.beginTx() )
  5.   {
  6.     node = graphDb.createNode().getId();
  7.     ctx.success();
  8.   }
  9.   return node;
  10. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void testFromSimpleCypherResult()
  3. {
  4.   Node n = gdb.createNode();
  5.   final ExecutionResult result = result( "node", n );
  6.   final SubGraph graph = CypherResultSubGraph.from( result, gdb, false );
  7.   assertEquals( "create (_" + n.getId() + ")" + lineSeparator() + ";" + lineSeparator(), doExportGraph( graph ) );
  8. }

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 shouldIterateThroughNodes()
  3. {
  4.   // given
  5.   Path path = new PathProxy( proxySPI, new long[] {1, 2, 3}, new long[] {100, 200}, new int[] {0, ~0} );
  6.   Iterator<Node> iterator = path.nodes().iterator();
  7.   Node node;
  8.   // then
  9.   assertTrue( iterator.hasNext() );
  10.   assertThat( node = iterator.next(), instanceOf( Node.class ) );
  11.   assertEquals( 1, node.getId() );
  12.   assertTrue( iterator.hasNext() );
  13.   assertThat( node = iterator.next(), instanceOf( Node.class ) );
  14.   assertEquals( 2, node.getId() );
  15.   assertTrue( iterator.hasNext() );
  16.   assertThat( node = iterator.next(), instanceOf( Node.class ) );
  17.   assertEquals( 3, node.getId() );
  18.   assertFalse( iterator.hasNext() );
  19. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void queryResultsMustIncludeNodesAddedInThisTransaction()
  3. {
  4.   db = createDatabase();
  5.   try ( Transaction tx = db.beginTx() )
  6.   {
  7.     createSimpleNodesIndex();
  8.     tx.success();
  9.   }
  10.   awaitIndexesOnline();
  11.   try ( Transaction tx = db.beginTx() )
  12.   {
  13.     Node node = db.createNode( LABEL );
  14.     node.setProperty( PROP, "value" );
  15.     assertQueryFindsIds( db, true, "nodes", "value", newSetWith( node.getId() ) );
  16.     tx.success();
  17.   }
  18. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void canAcquireReadLock()
  3. {
  4.   // when
  5.   placeboTx.acquireReadLock( resource );
  6.   // then
  7.   verify( locks ).acquireSharedNodeLock( resource.getId() );
  8. }

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