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

public static Function<Node,Node> addLabel( Label label )
{
  return node ->
  {
    node.addLabel( label );
    return node;
  };
}

代码示例来源：origin: neo4j/neo4j

@Override
  public void accept( Transaction transaction )
  {
    node.addLabel( label );
  }
};

代码示例来源：origin: neo4j/neo4j

public NodeRepresentation createNode( Map<String,Object> properties, Label... labels )
    throws PropertyValueException
{
  Node node = graphDb.createNode();
  propertySetter.setProperties( node, properties );
  if ( labels != null )
  {
    for ( Label label : labels )
    {
      node.addLabel( label );
    }
  }
  return new NodeRepresentation( node );
}

代码示例来源：origin: neo4j/neo4j

private void addLabels( Node node, Label... labels )
{
  try ( Transaction tx = dbRule.beginTx() )
  {
    for ( Label label : labels )
    {
      node.addLabel( label );
    }
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

private void addLabelToUnLabeledNode( Node unLabeledNode )
{
  try ( Transaction tx = db.beginTx() )
  {
    unLabeledNode.addLabel( LABEL );
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

private void addLabel( Node node, Label label )
{
  try ( Transaction tx = db.beginTx() )
  {
    node.addLabel( label );
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

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

代码示例来源：origin: neo4j/neo4j

public void add( Node node, String label )
{
  node.addLabel( label( label ) );
  put( added, node, label );
}

代码示例来源：origin: neo4j/neo4j

private void modifyLabelsOnExistingNode( List<Pair<Long,Label[]>> existingNodes )
{
  int targetIndex = random.nextInt( existingNodes.size() );
  Pair<Long,Label[]> existingPair = existingNodes.get( targetIndex );
  long nodeId = existingPair.first();
  Node node = db.getNodeById( nodeId );
  node.getLabels().forEach( node::removeLabel );
  Label[] newLabels = randomLabels();
  for ( Label label : newLabels )
  {
    node.addLabel( label );
  }
  existingNodes.remove( targetIndex );
  existingNodes.add( Pair.of( nodeId, newLabels ) );
}

代码示例来源：origin: neo4j/neo4j

private void modifyLabelsOnExistingNode( List<Pair<Long,Label[]>> existingNodes )
{
  int targetIndex = random.nextInt( existingNodes.size() );
  Pair<Long,Label[]> existingPair = existingNodes.get( targetIndex );
  long nodeId = existingPair.first();
  Node node = db.getNodeById( nodeId );
  node.getLabels().forEach( node::removeLabel );
  Label[] newLabels = randomLabels();
  for ( Label label : newLabels )
  {
    node.addLabel( label );
  }
  existingNodes.remove( targetIndex );
  existingNodes.add( Pair.of( nodeId, newLabels ) );
}

代码示例来源：origin: neo4j/neo4j

@Test
public void testSingleNodeLabels()
{
  Node n = gdb.createNode();
  n.addLabel( Label.label( "Foo" ) );
  n.addLabel( Label.label( "Bar" ) );
  final ExecutionResult result = result( "node", n );
  final SubGraph graph = CypherResultSubGraph.from( result, gdb, false );
  assertEquals( "create (_" + n.getId() + ":`Foo`:`Bar`)" + lineSeparator() + ";" + lineSeparator(),
      doExportGraph( graph ) );
}

代码示例来源：origin: neo4j/neo4j

private void addLabels( long nodeId, int startLabelIndex, int count )
{
  try ( Transaction tx = dbRule.beginTx() )
  {
    Node node = dbRule.getNodeById( nodeId );
    int endLabelIndex = startLabelIndex + count;
    for ( int i = startLabelIndex; i < endLabelIndex; i++ )
    {
      node.addLabel( labelWithIndex( i ) );
    }
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void addConcurrentlySameLabelToANode() throws Throwable
{
  final long nodeId = initWithNode( db );
  Thread t1 = newThreadForNodeAction( nodeId, node -> node.addLabel( Label.label( "A" ) ) );
  Thread t2 = newThreadForNodeAction( nodeId, node -> node.addLabel( Label.label( "A" ) ) );
  startAndWait( t1, t2 );
  db.shutdown();
  assertDatabaseConsistent();
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldNotWarnOnSmallLabelScansWithLoadCVS()
{
  try ( Transaction tx = db().beginTx() )
  {
    db().createNode().addLabel( label( "A" ) );
    tx.success();
  }
  Stream.of( "CYPHER 3.1", "CYPHER 3.5" ).forEach( version ->
  {
    shouldNotNotifyInStream( version, "EXPLAIN LOAD CSV FROM 'file:///ignore/ignore.csv' AS line MATCH (a:A) RETURN *" );
    shouldNotNotifyInStream( version, "EXPLAIN LOAD CSV FROM 'file:///ignore/ignore.csv' AS line MERGE (a:A) RETURN *" );
  } );
}

代码示例来源：origin: neo4j/neo4j

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

代码示例来源：origin: neo4j/neo4j

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

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldWarnOnMisspelledLabel()
{
  try ( Transaction tx = db().beginTx() )
  {
    db().createNode().addLabel( label( "Person" ) );
    tx.success();
  }
  Stream.of( "CYPHER 2.3", "CYPHER 3.1", "CYPHER 3.5" ).forEach( version ->
  {
    assertNotifications(version + "EXPLAIN MATCH (n:Preson) RETURN *", containsItem( unknownLabelWarning ) );
    shouldNotNotifyInStream( version, "EXPLAIN MATCH (n:Person) RETURN *" );
  });
}

代码示例来源：origin: neo4j/neo4j

public void addLabelToNode( long node, String labelName )
{
  try ( Transaction tx = database.getGraph().beginTransaction( implicit, AnonymousContext.writeToken() ) )
  {
    database.getGraph().getNodeById( node ).addLabel( label( labelName ) );
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldNotNotifyOnDynamicPropertyLookupWithLabelHavingNoIndex()
{
  Stream.of( "CYPHER 2.3", "CYPHER 3.1", "CYPHER 3.5" ).forEach( version ->
  {
    db().execute( "CREATE INDEX ON :Person(name)" );
    db().execute( "Call db.awaitIndexes()" );
    try ( Transaction tx = db().beginTx() )
    {
      db().createNode().addLabel( label( "Foo" ) );
      tx.success();
    }
    shouldNotNotifyInStream( version, "EXPLAIN MATCH (n:Foo) WHERE n['key-' + n.name] = 'value' RETURN n" );
  } );
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldWarnOnMisspelledRelationship()
{
  try ( Transaction tx = db().beginTx() )
  {
    db().createNode().addLabel( label( "Person" ) );
    tx.success();
  }
  Stream.of( "CYPHER 2.3", "CYPHER 3.1", "CYPHER 3.5" ).forEach( version ->
  {
    db().execute( "CREATE (n)-[r:R]->(m)");
    assertNotifications(version + "EXPLAIN MATCH ()-[r:r]->() RETURN *", containsItem( unknownRelationshipWarning ) );
    shouldNotNotifyInStream( version, "EXPLAIN MATCH ()-[r:R]->() RETURN *" );
  });
}

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