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

Node.removeLabel介绍

[英]Removes a Label from this node. If this node doesn't have this label, nothing will happen.
[中]从此节点删除标签。如果此节点没有此标签，则不会发生任何事情。

代码示例

代码示例来源：origin: neo4j/neo4j

  1. public void removeLabelFromNode( long nodeId, String labelName ) throws NodeNotFoundException
  2. {
  3.   node( nodeId ).removeLabel( label( labelName ) );
  4. }

代码示例来源：origin: neo4j/neo4j

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

代码示例来源：origin: neo4j/neo4j

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

代码示例来源：origin: neo4j/neo4j

  1. public void remove( Node node, String label )
  2. {
  3.   node.removeLabel( label( label ) );
  4.   put( removed, node, label );
  5. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldHandleUpdateRemovalOfLabelConcurrentlyWithIndexDrop() throws Throwable
  3. {
  4.   shouldHandleIndexDropConcurrentlyWithOperation( nodeId -> db.getNodeById( nodeId ).removeLabel( LABEL ) );
  5. }

代码示例来源：origin: neo4j/neo4j

  1. public void setLabelsOnNode( long nodeId, Collection<String> labels ) throws NodeNotFoundException,
  2.     BadInputException
  3. {
  4.   Node node = node( nodeId );
  5.   try
  6.   {
  7.     // Remove current labels
  8.     for ( Label label : node.getLabels() )
  9.     {
  10.       node.removeLabel( label );
  11.     }
  12.     // Add new labels
  13.     for ( String labelName : labels )
  14.     {
  15.       node.addLabel( label( labelName ) );
  16.     }
  17.   }
  18.   catch ( org.neo4j.graphdb.ConstraintViolationException e )
  19.   {
  20.     throw new BadInputException( "Unable to add label, see nested exception.", e );
  21.   }
  22. }

代码示例来源：origin: neo4j/neo4j

  1. private void removeLabelFromExistingNode( List<Pair<Long,Label[]>> nodesInStore )
  2. {
  3.   Pair<Long,Label[]> existingNode;
  4.   Node node;
  5.   do
  6.   {
  7.     int targetIndex = random.nextInt( nodesInStore.size() );
  8.     existingNode = nodesInStore.get( targetIndex );
  9.     node = db.getNodeById( existingNode.first() );
  10.   }
  11.   while ( existingNode.other().length == 0 );
  12.   node.removeLabel( existingNode.other()[0] );
  13. }

代码示例来源：origin: neo4j/neo4j

  1. private void removeLabels( 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.removeLabel( labelWithIndex( i ) );
  10.     }
  11.     tx.success();
  12.   }
  13. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   void perform( Graph graph, ExpectedTransactionData expectations )
  3.   {
  4.     Node node = graph.randomNode();
  5.     if ( node != null )
  6.     {
  7.       Label label = graph.randomLabel();
  8.       if ( node.hasLabel( label ) )
  9.       {
  10.         node.removeLabel( label );
  11.         expectations.removedLabel( node, label );
  12.         debug( node + " " + label );
  13.       }
  14.     }
  15.   }
  16. },

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void removingCommittedLabel()
  3. {
  4.   // Given
  5.   GraphDatabaseService graphDatabase = dbRule.getGraphDatabaseAPI();
  6.   Label label = Labels.MY_LABEL;
  7.   Node myNode = createNode( graphDatabase, label );
  8.   // When
  9.   try ( Transaction tx = graphDatabase.beginTx() )
  10.   {
  11.     myNode.removeLabel( label );
  12.     tx.success();
  13.   }
  14.   // Then
  15.   assertThat( myNode, not( inTx( graphDatabase, hasLabel( label ) ) ) );
  16. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void removingNonExistentLabel()
  3. {
  4.   // Given
  5.   GraphDatabaseService beansAPI = dbRule.getGraphDatabaseAPI();
  6.   Label label = Labels.MY_LABEL;
  7.   // When
  8.   Node myNode;
  9.   try ( Transaction tx = beansAPI.beginTx() )
  10.   {
  11.     myNode = beansAPI.createNode();
  12.     myNode.removeLabel( label );
  13.     tx.success();
  14.   }
  15.   // THEN
  16.   assertThat( myNode, not( inTx( beansAPI, hasLabel( label ) ) ) );
  17. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void removingExistingLabelFromUnlabeledNode()
  3. {
  4.   // Given
  5.   GraphDatabaseService beansAPI = dbRule.getGraphDatabaseAPI();
  6.   Label label = Labels.MY_LABEL;
  7.   createNode( beansAPI, label );
  8.   Node myNode = createNode( beansAPI );
  9.   // When
  10.   try ( Transaction tx = beansAPI.beginTx() )
  11.   {
  12.     myNode.removeLabel( label );
  13.     tx.success();
  14.   }
  15.   // THEN
  16.   assertThat( myNode, not( inTx( beansAPI, hasLabel( label ) ) ) );
  17. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void removingLabelDoesNotBreakPreviouslyCreatedLabelsIterator()
  3. {
  4.   // GIVEN
  5.   GraphDatabaseService db = dbRule.getGraphDatabaseAPI();
  6.   Label label1 = label( "A" );
  7.   Label label2 = label( "B" );
  8.   try ( Transaction tx = db.beginTx() )
  9.   {
  10.     Node node = db.createNode( label1, label2 );
  11.     for ( Label next : node.getLabels() )
  12.     {
  13.       node.removeLabel( next );
  14.     }
  15.     tx.success();
  16.   }
  17. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void removingUncommittedLabel()
  3. {
  4.   // Given
  5.   GraphDatabaseService beansAPI = dbRule.getGraphDatabaseAPI();
  6.   Label label = Labels.MY_LABEL;
  7.   // When
  8.   Node myNode;
  9.   try ( Transaction tx = beansAPI.beginTx() )
  10.   {
  11.     myNode = beansAPI.createNode();
  12.     myNode.addLabel( label );
  13.     myNode.removeLabel( label );
  14.     // THEN
  15.     assertFalse( myNode.hasLabel( label ) );
  16.     tx.success();
  17.   }
  18. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldIdentifyTransactionWithNetZeroChangesAsReadOnly()
  3. {
  4.   // GIVEN a transaction that has seen some changes, where all those changes result in a net 0 change set
  5.   // a good way of producing such state is to add a label to an existing node, and then remove it.
  6.   GraphDatabaseAPI db = dbr.getGraphDatabaseAPI();
  7.   TransactionIdStore txIdStore = db.getDependencyResolver().resolveDependency( TransactionIdStore.class );
  8.   long startTxId = txIdStore.getLastCommittedTransactionId();
  9.   Node node = createEmptyNode( db );
  10.   try ( Transaction tx = db.beginTx() )
  11.   {
  12.     node.addLabel( TestLabels.LABEL_ONE );
  13.     node.removeLabel( TestLabels.LABEL_ONE );
  14.     tx.success();
  15.   } // WHEN closing that transaction
  16.   // THEN it should not have been committed
  17.   assertEquals( "Expected last txId to be what it started at + 2 (1 for the empty node, and one for the label)",
  18.       startTxId + 2, txIdStore.getLastCommittedTransactionId() );
  19. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void queryResultsMustNotIncludeNodesWithRemovedIndexedLabels()
  3. {
  4.   db = createDatabase();
  5.   try ( Transaction tx = db.beginTx() )
  6.   {
  7.     createSimpleNodesIndex();
  8.     tx.success();
  9.   }
  10.   long nodeId;
  11.   try ( Transaction tx = db.beginTx() )
  12.   {
  13.     Node node = db.createNode( LABEL );
  14.     node.setProperty( PROP, "value" );
  15.     nodeId = node.getId();
  16.     tx.success();
  17.   }
  18.   try ( Transaction tx = db.beginTx() )
  19.   {
  20.     db.getNodeById( nodeId ).removeLabel( LABEL );
  21.     assertQueryFindsIds( db, true, "nodes", "nodes" );
  22.     tx.success();
  23.   }
  24. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldDetectNoChangesInCommitsAlsoForTheIndexes()
  3. {
  4.   // GIVEN a transaction that has seen some changes, where all those changes result in a net 0 change set
  5.   // a good way of producing such state is to add a label to an existing node, and then remove it.
  6.   GraphDatabaseAPI db = dbr.getGraphDatabaseAPI();
  7.   TransactionIdStore txIdStore = db.getDependencyResolver().resolveDependency( TransactionIdStore.class );
  8.   long startTxId = txIdStore.getLastCommittedTransactionId();
  9.   Node node = createEmptyNode( db );
  10.   Index<Node> index = createNodeIndex( db );
  11.   try ( Transaction tx = db.beginTx() )
  12.   {
  13.     node.addLabel( TestLabels.LABEL_ONE );
  14.     node.removeLabel( TestLabels.LABEL_ONE );
  15.     index.add( node, "key", "value" );
  16.     index.remove( node, "key", "value" );
  17.     tx.success();
  18.   } // WHEN closing that transaction
  19.   // THEN it should not have been committed
  20.   assertEquals( "Expected last txId to be what it started at + 3 " +
  21.          "(1 for the empty node, 1 for index, and one for the label)",
  22.       startTxId + 3, txIdStore.getLastCommittedTransactionId() );
  23. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void getNodesWithLabelsWithTxAddsAndRemoves()
  3. {
  4.   // GIVEN
  5.   GraphDatabaseService beansAPI = dbRule.getGraphDatabaseAPI();
  6.   Node node1 = createNode( beansAPI, Labels.MY_LABEL, Labels.MY_OTHER_LABEL );
  7.   Node node2 = createNode( beansAPI, Labels.MY_LABEL, Labels.MY_OTHER_LABEL );
  8.   // WHEN
  9.   Node node3;
  10.   Set<Node> nodesWithMyLabel;
  11.   Set<Node> nodesWithMyOtherLabel;
  12.   try ( Transaction tx = beansAPI.beginTx() )
  13.   {
  14.     node3 = beansAPI.createNode( Labels.MY_LABEL );
  15.     node2.removeLabel( Labels.MY_LABEL );
  16.     // extracted here to be asserted below
  17.     nodesWithMyLabel = asSet( beansAPI.findNodes( Labels.MY_LABEL ) );
  18.     nodesWithMyOtherLabel = asSet( beansAPI.findNodes( Labels.MY_OTHER_LABEL ) );
  19.     tx.success();
  20.   }
  21.   // THEN
  22.   assertEquals( asSet( node1, node3 ), nodesWithMyLabel );
  23.   assertEquals( asSet( node1, node2 ), nodesWithMyOtherLabel );
  24. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldUpdateRelationshipWithLabelCountsWhenRemovingLabelAndDeletingRelationship()
  3. {
  4.   // given
  5.   Node foo;
  6.   try ( Transaction tx = db.beginTx() )
  7.   {
  8.     foo = db.createNode( label( "Foo" ) );
  9.     Node bar = db.createNode( label( "Bar" ) );
  10.     foo.createRelationshipTo( bar, withName( "BAZ" ) );
  11.     tx.success();
  12.   }
  13.   long before = numberOfRelationshipsMatching( label( "Foo" ), withName( "BAZ" ), null );
  14.   // when
  15.   try ( Transaction tx = db.beginTx() )
  16.   {
  17.     for ( Relationship relationship : foo.getRelationships() )
  18.     {
  19.       relationship.delete();
  20.     }
  21.     foo.removeLabel( label("Foo"));
  22.     tx.success();
  23.   }
  24.   long after = numberOfRelationshipsMatching( label( "Foo" ), withName( "BAZ" ), null );
  25.   // then
  26.   assertEquals( before - 1, after );
  27. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldMaintainCountsOnLabelRemove()
  3. {
  4.   // given
  5.   Node foo;
  6.   Node bar;
  7.   try ( Transaction tx = db.beginTx() )
  8.   {
  9.     foo = db.createNode( label( "Foo" ) );
  10.     bar = db.createNode( label( "Bar" ) );
  11.     foo.createRelationshipTo( bar, withName( "KNOWS" ) );
  12.     tx.success();
  13.   }
  14.   // when
  15.   try ( Transaction tx = db.beginTx() )
  16.   {
  17.     foo.removeLabel( label( "Foo" ) );
  18.     tx.success();
  19.   }
  20.   // then
  21.   numberOfRelationshipsMatching( label( "Foo" ), withName( "KNOWS" ), null ).shouldBe( 0 );
  22.   numberOfRelationshipsMatching( null, withName( "KNOWS" ), label( "Foo" ) ).shouldBe( 0 );
  23.   numberOfRelationshipsMatching( null, withName( "KNOWS" ), label( "Bar" ) ).shouldBe( 1 );
  24.   numberOfRelationshipsMatching( label( "Bar" ), withName( "KNOWS" ), null ).shouldBe( 0 );
  25. }

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