本文整理了Java中org.neo4j.internal.kernel.api.Write.relationshipDelete()方法的一些代码示例，展示了Write.relationshipDelete()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。Write.relationshipDelete()方法的具体详情如下：
包路径：org.neo4j.internal.kernel.api.Write
类名称：Write
方法名：relationshipDelete

Write.relationshipDelete介绍

[英]Delete a relationship
[中]删除关系

代码示例

代码示例来源：origin: neo4j/neo4j

@Override
public void delete()
{
  KernelTransaction transaction = spi.kernelTransaction();
  try
  {
    boolean deleted = transaction.dataWrite().relationshipDelete( id );
    if ( !deleted )
    {
      throw new NotFoundException( "Unable to delete relationship[" +
                     getId() + "] since it is already deleted." );
    }
  }
  catch ( InvalidTransactionTypeKernelException e )
  {
    throw new ConstraintViolationException( e.getMessage(), e );
  }
  catch ( AutoIndexingKernelException e )
  {
    throw new IllegalStateException( "Auto indexing encountered a failure while deleting the relationship: "
                     + e.getMessage(), e );
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldNotDeleteRelationshipThatDoesNotExist() throws Exception
{
  long relationship = 0;
  try ( Transaction tx = beginTransaction() )
  {
    assertFalse( tx.dataWrite().relationshipDelete( relationship ) );
    tx.failure();
  }
  try ( Transaction tx = beginTransaction() )
  {
    assertFalse( tx.dataWrite().relationshipDelete( relationship ) );
    tx.success();
  }
  // should not crash
}

代码示例来源：origin: neo4j/neo4j

throw new IllegalStateException( "Oh ye be cursed, foul checkstyle!" );
tx.dataWrite().relationshipDelete( head.id );
expectedCounts.put( kv.getKey(), rs.size() + 1 );

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldNotAllowModifyingPropertiesOnDeletedRelationship() throws Exception
{
  // given
  Transaction transaction = newTransaction( AnonymousContext.writeToken() );
  int prop1 = transaction.tokenWrite().propertyKeyGetOrCreateForName( "prop1" );
  int type = transaction.tokenWrite().relationshipTypeGetOrCreateForName( "RELATED" );
  long startNodeId = transaction.dataWrite().nodeCreate();
  long endNodeId = transaction.dataWrite().nodeCreate();
  long rel = transaction.dataWrite().relationshipCreate( startNodeId, type, endNodeId );
  transaction.dataWrite().relationshipSetProperty( rel, prop1, Values.stringValue( "As" ) );
  transaction.dataWrite().relationshipDelete( rel );
  // When
  try
  {
    transaction.dataWrite().relationshipRemoveProperty( rel, prop1 );
    fail( "Should have failed." );
  }
  catch ( EntityNotFoundException e )
  {
    assertThat( e.getMessage(), equalTo( "Unable to load RELATIONSHIP with id " + rel + "." ) );
  }
  commit();
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldNotCountRemovedRelationships() throws Exception
{
  int relationshipId;
  long relationship;
  try ( Transaction tx = beginTransaction() )
  {
    Write write = tx.dataWrite();
    relationshipId = tx.tokenWrite().relationshipTypeGetOrCreateForName( "R" );
    relationship = write.relationshipCreate( write.nodeCreate(), relationshipId, write.nodeCreate() );
    tx.success();
  }
  try ( Transaction tx = beginTransaction() )
  {
    Write write = tx.dataWrite();
    write.relationshipDelete( relationship );
    long countsTxState = tx.dataRead().countsForRelationship( -1, relationshipId, -1 );
    long countsNoTxState = tx.dataRead().countsForRelationshipWithoutTxState( -1, relationshipId, -1 );
    assertEquals( 0, countsTxState );
    assertEquals( 1, countsNoTxState );
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldDetectRelationshipDeletedInTransaction() throws Exception
{
  // GIVEN
  long node;
  int relType;
  long deletedInTx, unaffected, addedInTx, addedAndRemovedInTx;
  try ( Transaction tx = beginTransaction() )
  {
    node = tx.dataWrite().nodeCreate();
    relType = tx.tokenWrite().relationshipTypeCreateForName( "REL_TYPE" );
    deletedInTx = tx.dataWrite().relationshipCreate(node, relType, node);
    unaffected = tx.dataWrite().relationshipCreate(node, relType, node);
    tx.success();
  }
  try ( Transaction tx = beginTransaction() )
  {
    // WHEN
    addedInTx = tx.dataWrite().relationshipCreate(node, relType, node);
    addedAndRemovedInTx = tx.dataWrite().relationshipCreate(node, relType, node);
    tx.dataWrite().relationshipDelete( deletedInTx );
    tx.dataWrite().relationshipDelete( addedAndRemovedInTx );
    // THEN
    assertFalse( tx.dataRead().relationshipDeletedInTransaction( addedInTx ) );
    assertFalse( tx.dataRead().relationshipDeletedInTransaction( unaffected ) );
    assertTrue( tx.dataRead().relationshipDeletedInTransaction( addedAndRemovedInTx ) );
    assertTrue( tx.dataRead().relationshipDeletedInTransaction( deletedInTx ) );
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldDeleteRelationship() throws Exception
{
  long n1, r;
  try ( org.neo4j.graphdb.Transaction tx = graphDb.beginTx() )
  {
    Node node1 = graphDb.createNode();
    Node node2 = graphDb.createNode();
    n1 = node1.getId();
    r = node1.createRelationshipTo( node2, RelationshipType.withName( "R" ) ).getId();
    tx.success();
  }
  try ( Transaction tx = beginTransaction() )
  {
    assertTrue( "should delete relationship", tx.dataWrite().relationshipDelete( r ) );
    tx.success();
  }
  try ( org.neo4j.graphdb.Transaction ignore = graphDb.beginTx() )
  {
    assertEquals( 0, graphDb.getNodeById( n1 ).getDegree() );
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldDeleteRelationshipAddedInTransaction() throws Exception
{
  long n1, n2;
  try ( org.neo4j.graphdb.Transaction tx = graphDb.beginTx() )
  {
    n1 = graphDb.createNode().getId();
    n2 = graphDb.createNode().getId();
    tx.success();
  }
  try ( Transaction tx = beginTransaction() )
  {
    int label = tx.token().relationshipTypeGetOrCreateForName( "R" );
    long r = tx.dataWrite().relationshipCreate( n1, label, n2 );
    assertTrue( tx.dataWrite().relationshipDelete( r ) );
    tx.success();
  }
  try ( org.neo4j.graphdb.Transaction ignore = graphDb.beginTx() )
  {
    assertEquals( 0, graphDb.getNodeById( n1 ).getDegree() );
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldNotScanRelationshipWhichWasDeletedInTransaction() throws Exception
{
  final int nRelationshipsInStore = 5 + 1 + 5;
  int type;
  long n1, n2, r;
  try ( Transaction tx = beginTransaction() )
  {
    n1 = tx.dataWrite().nodeCreate();
    n2 = tx.dataWrite().nodeCreate();
    type = tx.tokenWrite().relationshipTypeGetOrCreateForName( "R" );
    relateNTimes( 5, type, n1, n2, tx );
    r = tx.dataWrite().relationshipCreate( n1, type, n2 );
    relateNTimes( 5, type, n1, n2, tx );
    tx.success();
  }
  try ( Transaction tx = beginTransaction() )
  {
    assertTrue( "should delete relationship", tx.dataWrite().relationshipDelete( r ) );
    try ( RelationshipScanCursor relationship = tx.cursors().allocateRelationshipScanCursor() )
    {
      tx.dataRead().allRelationshipsScan( relationship );
      assertCountRelationships( relationship, nRelationshipsInStore - 1, n1, type, n2 );
    }
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldNotSeeRelationshipDeletedInTransaction() throws Exception
{
  long n1, n2, r;
  try ( Transaction tx = beginTransaction() )
  {
    n1 = tx.dataWrite().nodeCreate();
    n2 = tx.dataWrite().nodeCreate();
    int label = tx.tokenWrite().relationshipTypeGetOrCreateForName( "R" );
    r = tx.dataWrite().relationshipCreate( n1, label, n2 );
    tx.success();
  }
  try ( Transaction tx = beginTransaction() )
  {
    tx.dataWrite().relationshipDelete( r );
    try ( NodeCursor node = tx.cursors().allocateNodeCursor();
       RelationshipTraversalCursor relationship = tx.cursors().allocateRelationshipTraversalCursor() )
    {
      tx.dataRead().singleNode( n1, node );
      assertTrue( "should access node", node.next() );
      node.allRelationships( relationship );
      assertFalse( "should not find relationship", relationship.next() );
    }
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldNotSeeSingleRelationshipWhichWasDeletedInTransaction() throws Exception
{
  int label;
  long n1, n2, r;
  try ( Transaction tx = beginTransaction() )
  {
    n1 = tx.dataWrite().nodeCreate();
    n2 = tx.dataWrite().nodeCreate();
    label = tx.tokenWrite().relationshipTypeGetOrCreateForName( "R" );
    long decoyNode = tx.dataWrite().nodeCreate();
    tx.dataWrite().relationshipCreate( n2, label, decoyNode ); // to have >1 relationship in the db
    r = tx.dataWrite().relationshipCreate( n1, label, n2 );
    tx.success();
  }
  try ( Transaction tx = beginTransaction() )
  {
    assertTrue( "should delete relationship", tx.dataWrite().relationshipDelete( r ) );
    try ( RelationshipScanCursor relationship = tx.cursors().allocateRelationshipScanCursor() )
    {
      tx.dataRead().singleRelationship( r, relationship );
      assertFalse( "should not find relationship", relationship.next() );
    }
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

transaction.dataWrite().relationshipDelete( fromRefToOther1 );
long endNode = transaction.dataWrite().nodeCreate();
long localTxRel = transaction.dataWrite().relationshipCreate(  refNode, relType1, endNode );

代码示例来源：origin: org.neo4j/neo4j-kernel

@Override
public void delete()
{
  KernelTransaction transaction = spi.kernelTransaction();
  try
  {
    boolean deleted = transaction.dataWrite().relationshipDelete( id );
    if ( !deleted )
    {
      throw new NotFoundException( "Unable to delete relationship[" +
                     getId() + "] since it is already deleted." );
    }
  }
  catch ( InvalidTransactionTypeKernelException e )
  {
    throw new ConstraintViolationException( e.getMessage(), e );
  }
  catch ( AutoIndexingKernelException e )
  {
    throw new IllegalStateException( "Auto indexing encountered a failure while deleting the relationship: "
                     + e.getMessage(), e );
  }
}