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

Node.addLabel介绍

[英]Adds a Label to this node. If this node doesn't already have this label it will be added. If it already has the label, nothing will happen.
[中]将标签添加到此节点。如果此节点尚未具有此标签，则将添加它。如果它已经有了标签，什么也不会发生。

代码示例

代码示例来源：origin: neo4j/neo4j

  1. public static Function<Node,Node> addLabel( Label label )
  2. {
  3.   return node ->
  4.   {
  5.     node.addLabel( label );
  6.     return node;
  7.   };
  8. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   public void accept( Transaction transaction )
  3.   {
  4.     node.addLabel( label );
  5.   }
  6. };

代码示例来源：origin: neo4j/neo4j

  1. public NodeRepresentation createNode( Map<String,Object> properties, Label... labels )
  2.     throws PropertyValueException
  3. {
  4.   Node node = graphDb.createNode();
  5.   propertySetter.setProperties( node, properties );
  6.   if ( labels != null )
  7.   {
  8.     for ( Label label : labels )
  9.     {
  10.       node.addLabel( label );
  11.     }
  12.   }
  13.   return new NodeRepresentation( node );
  14. }

代码示例来源：origin: neo4j/neo4j

  1. private void addLabels( Node node, Label... labels )
  2. {
  3.   try ( Transaction tx = dbRule.beginTx() )
  4.   {
  5.     for ( Label label : labels )
  6.     {
  7.       node.addLabel( label );
  8.     }
  9.     tx.success();
  10.   }
  11. }

代码示例来源：origin: neo4j/neo4j

  1. private void addLabelToUnLabeledNode( Node unLabeledNode )
  2. {
  3.   try ( Transaction tx = db.beginTx() )
  4.   {
  5.     unLabeledNode.addLabel( LABEL );
  6.     tx.success();
  7.   }
  8. }

代码示例来源：origin: neo4j/neo4j

  1. private void addLabel( Node node, Label label )
  2. {
  3.   try ( Transaction tx = db.beginTx() )
  4.   {
  5.     node.addLabel( label );
  6.     tx.success();
  7.   }
  8. }

代码示例来源：origin: neo4j/neo4j

  1. private void addLabelToExistingNode( List<Pair<Long,Label[]>> nodesInStore )
  2. {
  3.   int targetIndex = random.nextInt( nodesInStore.size() );
  4.   Pair<Long,Label[]> existingNode = nodesInStore.get( targetIndex );
  5.   Node node = db.getNodeById( existingNode.first() );
  6.   node.addLabel( EXTRA_LABEL );
  7. }

代码示例来源：origin: neo4j/neo4j

  1. public void add( Node node, String label )
  2. {
  3.   node.addLabel( label( label ) );
  4.   put( added, node, label );
  5. }

代码示例来源：origin: neo4j/neo4j

  1. private void modifyLabelsOnExistingNode( List<Pair<Long,Label[]>> existingNodes )
  2. {
  3.   int targetIndex = random.nextInt( existingNodes.size() );
  4.   Pair<Long,Label[]> existingPair = existingNodes.get( targetIndex );
  5.   long nodeId = existingPair.first();
  6.   Node node = db.getNodeById( nodeId );
  7.   node.getLabels().forEach( node::removeLabel );
  8.   Label[] newLabels = randomLabels();
  9.   for ( Label label : newLabels )
  10.   {
  11.     node.addLabel( label );
  12.   }
  13.   existingNodes.remove( targetIndex );
  14.   existingNodes.add( Pair.of( nodeId, newLabels ) );
  15. }

代码示例来源：origin: neo4j/neo4j

  1. private void modifyLabelsOnExistingNode( List<Pair<Long,Label[]>> existingNodes )
  2. {
  3.   int targetIndex = random.nextInt( existingNodes.size() );
  4.   Pair<Long,Label[]> existingPair = existingNodes.get( targetIndex );
  5.   long nodeId = existingPair.first();
  6.   Node node = db.getNodeById( nodeId );
  7.   node.getLabels().forEach( node::removeLabel );
  8.   Label[] newLabels = randomLabels();
  9.   for ( Label label : newLabels )
  10.   {
  11.     node.addLabel( label );
  12.   }
  13.   existingNodes.remove( targetIndex );
  14.   existingNodes.add( Pair.of( nodeId, newLabels ) );
  15. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void testSingleNodeLabels()
  3. {
  4.   Node n = gdb.createNode();
  5.   n.addLabel( Label.label( "Foo" ) );
  6.   n.addLabel( Label.label( "Bar" ) );
  7.   final ExecutionResult result = result( "node", n );
  8.   final SubGraph graph = CypherResultSubGraph.from( result, gdb, false );
  9.   assertEquals( "create (_" + n.getId() + ":`Foo`:`Bar`)" + lineSeparator() + ";" + lineSeparator(),
  10.       doExportGraph( graph ) );
  11. }

代码示例来源：origin: neo4j/neo4j

  1. private void addLabels( long nodeId, int startLabelIndex, int count )
  2. {
  3.   try ( Transaction tx = dbRule.beginTx() )
  4.   {
  5.     Node node = dbRule.getNodeById( nodeId );
  6.     int endLabelIndex = startLabelIndex + count;
  7.     for ( int i = startLabelIndex; i < endLabelIndex; i++ )
  8.     {
  9.       node.addLabel( labelWithIndex( i ) );
  10.     }
  11.     tx.success();
  12.   }
  13. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void addConcurrentlySameLabelToANode() throws Throwable
  3. {
  4.   final long nodeId = initWithNode( db );
  5.   Thread t1 = newThreadForNodeAction( nodeId, node -> node.addLabel( Label.label( "A" ) ) );
  6.   Thread t2 = newThreadForNodeAction( nodeId, node -> node.addLabel( Label.label( "A" ) ) );
  7.   startAndWait( t1, t2 );
  8.   db.shutdown();
  9.   assertDatabaseConsistent();
  10. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldNotWarnOnSmallLabelScansWithLoadCVS()
  3. {
  4.   try ( Transaction tx = db().beginTx() )
  5.   {
  6.     db().createNode().addLabel( label( "A" ) );
  7.     tx.success();
  8.   }
  9.   Stream.of( "CYPHER 3.1", "CYPHER 3.5" ).forEach( version ->
  10.   {
  11.     shouldNotNotifyInStream( version, "EXPLAIN LOAD CSV FROM 'file:///ignore/ignore.csv' AS line MATCH (a:A) RETURN *" );
  12.     shouldNotNotifyInStream( version, "EXPLAIN LOAD CSV FROM 'file:///ignore/ignore.csv' AS line MERGE (a:A) RETURN *" );
  13.   } );
  14. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldWarnOnLargeLabelScansWithLoadCVSMatch()
  3. {
  4.   for ( int i = 0; i < 11; i++ )
  5.   {
  6.     try ( Transaction tx = db().beginTx() )
  7.     {
  8.       db().createNode().addLabel( label( "A" ) );
  9.       tx.success();
  10.     }
  11.   }
  12.   Stream.of( "CYPHER 3.1", "CYPHER 3.5" ).forEach(
  13.       version -> assertNotifications( version + "EXPLAIN LOAD CSV FROM 'file:///ignore/ignore.csv' AS line MATCH (a:A) RETURN *",
  14.           containsNoItem( largeLabelCSVWarning ) ) );
  15. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldWarnOnLargeLabelScansWithLoadCVSMerge()
  3. {
  4.   for ( int i = 0; i < 11; i++ )
  5.   {
  6.     try ( Transaction tx = db().beginTx() )
  7.     {
  8.       db().createNode().addLabel( label( "A" ) );
  9.       tx.success();
  10.     }
  11.   }
  12.   Stream.of( "CYPHER 3.1", "CYPHER 3.5" ).forEach(
  13.       version -> assertNotifications( version + "EXPLAIN LOAD CSV FROM 'file:///ignore/ignore.csv' AS line MERGE (a:A) RETURN *",
  14.           containsNoItem( largeLabelCSVWarning ) ) );
  15. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldWarnOnMisspelledLabel()
  3. {
  4.   try ( Transaction tx = db().beginTx() )
  5.   {
  6.     db().createNode().addLabel( label( "Person" ) );
  7.     tx.success();
  8.   }
  9.   Stream.of( "CYPHER 2.3", "CYPHER 3.1", "CYPHER 3.5" ).forEach( version ->
  10.   {
  11.     assertNotifications(version + "EXPLAIN MATCH (n:Preson) RETURN *", containsItem( unknownLabelWarning ) );
  12.     shouldNotNotifyInStream( version, "EXPLAIN MATCH (n:Person) RETURN *" );
  13.   });
  14. }

代码示例来源：origin: neo4j/neo4j

  1. public void addLabelToNode( long node, String labelName )
  2. {
  3.   try ( Transaction tx = database.getGraph().beginTransaction( implicit, AnonymousContext.writeToken() ) )
  4.   {
  5.     database.getGraph().getNodeById( node ).addLabel( label( labelName ) );
  6.     tx.success();
  7.   }
  8. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldNotNotifyOnDynamicPropertyLookupWithLabelHavingNoIndex()
  3. {
  4.   Stream.of( "CYPHER 2.3", "CYPHER 3.1", "CYPHER 3.5" ).forEach( version ->
  5.   {
  6.     db().execute( "CREATE INDEX ON :Person(name)" );
  7.     db().execute( "Call db.awaitIndexes()" );
  8.     try ( Transaction tx = db().beginTx() )
  9.     {
  10.       db().createNode().addLabel( label( "Foo" ) );
  11.       tx.success();
  12.     }
  13.     shouldNotNotifyInStream( version, "EXPLAIN MATCH (n:Foo) WHERE n['key-' + n.name] = 'value' RETURN n" );
  14.   } );
  15. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldWarnOnMisspelledRelationship()
  3. {
  4.   try ( Transaction tx = db().beginTx() )
  5.   {
  6.     db().createNode().addLabel( label( "Person" ) );
  7.     tx.success();
  8.   }
  9.   Stream.of( "CYPHER 2.3", "CYPHER 3.1", "CYPHER 3.5" ).forEach( version ->
  10.   {
  11.     db().execute( "CREATE (n)-[r:R]->(m)");
  12.     assertNotifications(version + "EXPLAIN MATCH ()-[r:r]->() RETURN *", containsItem( unknownRelationshipWarning ) );
  13.     shouldNotNotifyInStream( version, "EXPLAIN MATCH ()-[r:R]->() RETURN *" );
  14.   });
  15. }

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