org.neo4j.graphdb.Relationship.delete()方法的使用及代码示例

x33g5p2x  于2022-01-28 转载在 其他  
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本文整理了Java中org.neo4j.graphdb.Relationship.delete方法的一些代码示例，展示了Relationship.delete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。Relationship.delete方法的具体详情如下：
包路径：org.neo4j.graphdb.Relationship
类名称：Relationship
方法名：delete

Relationship.delete介绍

[英]Deletes this relationship. Invoking any methods on this relationship after delete() has returned is invalid and will lead to NotFoundException being thrown.
[中]删除此关系。在delete()返回后调用此关系上的任何方法无效，并将导致引发NotFoundException。

代码示例

代码示例来源：origin: neo4j/neo4j

private void deleteAlistairAndStefanNodes()
{
  try ( Transaction tx = graphDb.beginTx() )
  {
    aKnowsS.delete();
    sKnowsA.delete();
    alistair.delete();
    stefan.delete();
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void canCreateRelationshipBetweenTwoNodesWithLoopsThenDeleteOneOfTheNodesAndItsRelationships()
{
  Node source = getGraphDb().createNode();
  Node target = getGraphDb().createNode();
  source.createRelationshipTo( source, TEST );
  target.createRelationshipTo( target, TEST );
  source.createRelationshipTo( target, TEST );
  newTransaction();
  for ( Relationship rel : target.getRelationships() )
  {
    rel.delete();
  }
  target.delete();
}

代码示例来源：origin: neo4j/neo4j

@Test( expected = NotFoundException.class )
public void deletionOfAlreadyDeletedRelationshipShouldThrow()
{
  // Given
  GraphDatabaseService db = getGraphDb();
  // transaction is opened by test
  Node node1 = db.createNode();
  Node node2 = db.createNode();
  Relationship relationship = node1.createRelationshipTo( node2, TEST );
  commit();
  try ( Transaction tx = db.beginTx() )
  {
    relationship.delete();
    tx.success();
  }
  // When
  try ( Transaction tx = db.beginTx() )
  {
    relationship.delete();
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldAdvertiseRelationshipTypesThatCurrentlyExistInTheDatabase() throws Throwable
{
  try ( Transaction tx = db.beginTx() )
  {
    db.getRelationshipById( relId ).delete();
    tx.success();
  }
  Database database = new WrappedDatabase( db );
  DatabaseMetadataService service = new DatabaseMetadataService( database );
  try ( Transaction tx = db.beginTx() )
  {
    Response response = service.getRelationshipTypes( false );
    assertEquals( 200, response.getStatus() );
    List<Map<String,Object>> jsonList = JsonHelper.jsonToList( response.getEntity()
        .toString() );
    assertEquals( 3, jsonList.size() );
  }
  database.stop();
}

代码示例来源：origin: neo4j/neo4j

@Test
public void canDeleteNodeAfterDeletingItsRelationshipsIfThoseRelationshipsIncludeLoops()
{
  Node node = getGraphDb().createNode();
  txCreateLoop( node );
  txCreateRel( node );
  txCreateLoop( node );
  for ( Relationship rel : node.getRelationships() )
  {
    rel.delete();
  }
  node.delete();
  commit();
}

代码示例来源：origin: neo4j/neo4j

d = graphDb.createNode();
a.createRelationshipTo( a, withName( "ALPHA" ) );
a.createRelationshipTo( b, withName( "BETA" ) );
a.createRelationshipTo( c, withName( "GAMMA" ) );
a.createRelationshipTo( d, withName( "DELTA" ) );
dead.delete();
node.delete();

代码示例来源：origin: neo4j/neo4j

private void testGetRelationshipTypes( Node node, Set<String> expectedTypes )
{
  assertExpectedRelationshipTypes( expectedTypes, node, false );
  node.createRelationshipTo( getGraphDb().createNode(), RelType.TYPE1 );
  expectedTypes.add( RelType.TYPE1.name() );
  assertExpectedRelationshipTypes( expectedTypes, node, false );
  node.createRelationshipTo( getGraphDb().createNode(), RelType.TYPE1 );
  assertExpectedRelationshipTypes( expectedTypes, node, true );
  Relationship rel = node.createRelationshipTo( getGraphDb().createNode(), RelType.TYPE2 );
  expectedTypes.add( RelType.TYPE2.name() );
  assertExpectedRelationshipTypes( expectedTypes, node, false );
  rel.delete();
  expectedTypes.remove( RelType.TYPE2.name() );
  assertExpectedRelationshipTypes( expectedTypes, node, true );
  node.createRelationshipTo( getGraphDb().createNode(), RelType.TYPE2 );
  node.createRelationshipTo( getGraphDb().createNode(), RelType.TYPE2 );
  expectedTypes.add( RelType.TYPE2.name() );
  node.createRelationshipTo( getGraphDb().createNode(), MyRelTypes.TEST );
  expectedTypes.add( MyRelTypes.TEST.name() );
  assertExpectedRelationshipTypes( expectedTypes, node, true );
  for ( Relationship r : node.getRelationships( RelType.TYPE1 ) )
  {
    assertExpectedRelationshipTypes( expectedTypes, node, false );
    r.delete();
  }
  expectedTypes.remove( RelType.TYPE1.name() );
  assertExpectedRelationshipTypes( expectedTypes, node, true );
}

代码示例来源：origin: neo4j/neo4j

@Test
public void testDeletedRelationship()
{
  Node node1 = getGraphDb().createNode();
  Node node2 = getGraphDb().createNode();
  Relationship relationship = node1.createRelationshipTo( node2, TEST );
  relationship.delete();
  try
  {
    relationship.setProperty( "key1", 1 );
    fail( "Adding property to deleted rel should throw exception." );
  }
  catch ( Exception e )
  { // good
  }
  node1.delete();
  node2.delete();
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldAllowToStringOnCreatedRelationshipInAfterCommit()
    relationship = startNode.createRelationshipTo( endNode, type );
    tx.success();
  try ( Transaction tx = dbRule.beginTx() )
    relationship.delete();
    tx.success();

代码示例来源：origin: neo4j/neo4j

@Test
  public void shouldAdvertiseRelationshipTypesThatCurrentlyInUseInTheDatabase() throws Throwable
  {
    try ( Transaction tx = db.beginTx() )
    {
      db.getRelationshipById( relId ).delete();
      tx.success();
    }

    Database database = new WrappedDatabase( db );
    DatabaseMetadataService service = new DatabaseMetadataService( database );

    try ( Transaction tx = db.beginTx() )
    {
      Response response = service.getRelationshipTypes( true );

      assertEquals( 200, response.getStatus() );
      List<Map<String,Object>> jsonList = JsonHelper.jsonToList( response.getEntity()
          .toString() );
      assertEquals( 2, jsonList.size() );
    }
    database.stop();
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void createBatchNodeAndRelationshipsDeleteAllInEmbedded() throws Exception
{
  /*
   *    ()--[REL_TYPE1]-->(node)--[BATCH_TEST]->()
   */
  BatchInserter inserter = newBatchInserter();
  long nodeId = inserter.createNode( null );
  inserter.createRelationship( nodeId, inserter.createNode( null ),
      RelTypes.BATCH_TEST, null );
  inserter.createRelationship( inserter.createNode( null ), nodeId,
      RelTypes.REL_TYPE1, null );
  // Delete node and all its relationships
  GraphDatabaseService db = switchToEmbeddedGraphDatabaseService( inserter );
  try ( Transaction tx = db.beginTx() )
  {
    Node node = db.getNodeById( nodeId );
    for ( Relationship relationship : node.getRelationships() )
    {
      relationship.delete();
    }
    node.delete();
    tx.success();
  }
  db.shutdown();
}

代码示例来源：origin: neo4j/neo4j

private static void delete( Node node )
{
  for ( Relationship rel : node.getRelationships() )
  {
    rel.delete();
  }
  node.delete();
}

代码示例来源：origin: neo4j/neo4j

for ( int i = 0; i < initialSize; i++ )
  me.createRelationshipTo( getGraphDb().createNode(), RelType.INITIAL );
      me.createRelationshipTo( otherNode, spec.type );
      otherNode.createRelationshipTo( me, spec.type );
  if ( !otherNode.equals( me ) )
    otherNode.delete();
  rel.delete();
me.delete();

代码示例来源：origin: neo4j/neo4j

d = graphDb.createNode(), e = graphDb.createNode(), f = graphDb.createNode();
  a.createRelationshipTo( b, withName( "CIRCLE" ) );
  b.createRelationshipTo( c, withName( "CIRCLE" ) );
  one = c.createRelationshipTo( d, withName( "CIRCLE" ) ).getId();
  d.createRelationshipTo( e, withName( "CIRCLE" ) );
  e.createRelationshipTo( f, withName( "CIRCLE" ) );
try ( Transaction tx = graphDb.beginTx() )
  deleted.delete();
  for ( Relationship relationship : graphDb.getAllRelationships() )

代码示例来源：origin: neo4j/neo4j

@Test
public void testMultipleDeleteRelationship()
{
  Node node1 = getGraphDb().createNode();
  Node node2 = getGraphDb().createNode();
  Relationship rel = node1.createRelationshipTo( node2, MyRelTypes.TEST );
  rel.delete();
  node1.delete();
  node2.delete();
  try
  {
    rel.delete();
    Transaction tx = getTransaction();
    tx.success();
    tx.close();
    fail( "Should not validate" );
  }
  catch ( Exception e )
  {
    // ok
  }
}

代码示例来源：origin: neo4j/neo4j

@Test( expected = NotFoundException.class )
public void deletionOfSameRelationshipTwiceInOneTransactionShouldNotRollbackIt()
  Relationship relationship = node1.createRelationshipTo( node2, TEST );
  commit();
    relationship.delete();
    try
      relationship.delete();

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldLetDetectedDeadlocksDuringCommitBeThrownInTheirOriginalForm() throws Exception
  r2.delete();
  t1Tx.success();
  try

代码示例来源：origin: neo4j/neo4j

@Test
public void testDeleteReferenceNodeOrLastNodeIsOk()
{
  Transaction tx = getTransaction();
  for ( int i = 0; i < 10; i++ )
  {
    getGraphDb().createNode();
  }
  // long numNodesPre = getNodeManager().getNumberOfIdsInUse( Node.class
  // );
  // empty the DB instance
  for ( Node node : getGraphDb().getAllNodes() )
  {
    for ( Relationship rel : node.getRelationships() )
    {
      rel.delete();
    }
    node.delete();
  }
  tx.success();
  tx.close();
  tx = getGraphDb().beginTx();
  assertFalse( getGraphDb().getAllNodes().iterator().hasNext() );
  // TODO: this should be valid, fails right now!
  // assertEquals( 0, numNodesPost );
  tx.success();
  tx.close();
}

代码示例来源：origin: neo4j/neo4j

public void clear()
{
  for ( Node node : nodes.values() )
  {
    for ( Relationship relationship : node.getRelationships() )
    {
      relationship.delete();
    }
    node.delete();
  }
  nodes.clear();
  nodeNames.clear();
  edges.clear();
}

代码示例来源：origin: neo4j/neo4j

.createRelationshipTo( random.among( nodes ), randomRelationshipType() );
  if ( random.nextBoolean() )
    relationship.delete();
  node.delete();
  nodes.remove( node );
} );

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