org.hibernate.ogm.datastore.neo4j.dialect.impl

Class Neo4jAssociationQueries

java.lang.Object

org.hibernate.ogm.datastore.neo4j.dialect.impl.Neo4jAssociationQueries

public class Neo4jAssociationQueries
extends Object

Container for the queries related to one association family in Neo4j. Unfortunately, we cannot use the same queries for all associations, as Neo4j does not allow to parameterize on node labels which would be required, as the association table is stored as a label.

Author:

Davide D'Alto

Constructor Summary

Constructors

Constructor and Description
Neo4jAssociationQueries(EntityKeyMetadata ownerEntityKeyMetadata, AssociationKeyMetadata associationKeyMetadata)

Method Summary

Modifier and Type	Method and Description
protected static void	appendEntityNode(String alias, EntityKeyMetadata entityKeyMetadata, StringBuilder queryBuilder)
protected static void	appendLabel(EntityKeyMetadata entityKeyMetadata, StringBuilder queryBuilder)
protected static void	appendMatchOwnerEntityNode(StringBuilder queryBuilder, EntityKeyMetadata ownerEntityKeyMetadata)
protected static void	appendProperties(EntityKeyMetadata entityKeyMetadata, StringBuilder queryBuilder)
protected static void	appendProperties(StringBuilder queryBuilder, String[] columnNames, int offset)
protected static void	appendRelationshipType(StringBuilder queryBuilder, String relationshipType)
org.neo4j.graphdb.Relationship	createRelationshipForEmbeddedAssociation(org.neo4j.graphdb.GraphDatabaseService executionEngine, AssociationKey associationKey, EntityKey embeddedKey) Give an embedded association, creates all the nodes and relationships required to represent it.
org.neo4j.graphdb.Relationship	findRelationship(org.neo4j.graphdb.GraphDatabaseService executionEngine, AssociationKey associationKey, RowKey rowKey) Returns the relationship corresponding to the AssociationKey and RowKey.
protected Map<String,Object>	params(Object[] columnValues)
protected Map<String,Object>	params(Object[] columnValues, int offset)
void	removeAssociation(org.neo4j.graphdb.GraphDatabaseService executionEngine, AssociationKey associationKey) Removes the relationship(s) representing the given association.
void	removeAssociationRow(org.neo4j.graphdb.GraphDatabaseService executionEngine, AssociationKey associationKey, RowKey rowKey) Remove an association row
protected <T> T	singleResult(org.neo4j.graphdb.Result result)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Neo4jAssociationQueries

public Neo4jAssociationQueries(EntityKeyMetadata ownerEntityKeyMetadata,
                               AssociationKeyMetadata associationKeyMetadata)

Method Detail

removeAssociation

public void removeAssociation(org.neo4j.graphdb.GraphDatabaseService executionEngine,
                              AssociationKey associationKey)

Removes the relationship(s) representing the given association. If the association refers to an embedded entity (collection), the referenced entities are removed as well.

Parameters:

executionEngine - the GraphDatabaseService used to run the query

associationKey - represents the association

findRelationship

public org.neo4j.graphdb.Relationship findRelationship(org.neo4j.graphdb.GraphDatabaseService executionEngine,
                                                       AssociationKey associationKey,
                                                       RowKey rowKey)

Returns the relationship corresponding to the AssociationKey and RowKey.

Parameters:

executionEngine - the GraphDatabaseService used to run the query

associationKey - represents the association

rowKey - represents a row in an association

Returns:

the corresponding relationship

removeAssociationRow

public void removeAssociationRow(org.neo4j.graphdb.GraphDatabaseService executionEngine,
                                 AssociationKey associationKey,
                                 RowKey rowKey)

Remove an association row

Parameters:

executionEngine - the GraphDatabaseService used to run the query

associationKey - represents the association

rowKey - represents a row in an association

createRelationshipForEmbeddedAssociation

public org.neo4j.graphdb.Relationship createRelationshipForEmbeddedAssociation(org.neo4j.graphdb.GraphDatabaseService executionEngine,
                                                                               AssociationKey associationKey,
                                                                               EntityKey embeddedKey)

Give an embedded association, creates all the nodes and relationships required to represent it. It assumes that the entity node containing the association already exists in the db.

Parameters:

executionEngine - the GraphDatabaseService to run the query

associationKey - the AssociationKey identifying the association

embeddedKey - the EntityKey identifying the embedded component

Returns:

the created Relationship that represents the association

appendLabel

protected static void appendLabel(EntityKeyMetadata entityKeyMetadata,
                                  StringBuilder queryBuilder)

appendProperties

protected static void appendProperties(EntityKeyMetadata entityKeyMetadata,
                                       StringBuilder queryBuilder)

appendProperties

protected static void appendProperties(StringBuilder queryBuilder,
                                       String[] columnNames,
                                       int offset)

params

protected Map<String,Object> params(Object[] columnValues)

params

protected Map<String,Object> params(Object[] columnValues,
                                    int offset)

appendMatchOwnerEntityNode

protected static void appendMatchOwnerEntityNode(StringBuilder queryBuilder,
                                                 EntityKeyMetadata ownerEntityKeyMetadata)

appendEntityNode

protected static void appendEntityNode(String alias,
                                       EntityKeyMetadata entityKeyMetadata,
                                       StringBuilder queryBuilder)

appendRelationshipType

protected static void appendRelationshipType(StringBuilder queryBuilder,
                                             String relationshipType)

singleResult

protected <T> T singleResult(org.neo4j.graphdb.Result result)