Python neo4j.GraphDatabase类代码示例

class MetaInfoCreator( object ):
	def __init__( self, databasePath, datasetDict):

		#increment to existing db
		self.db = GraphDatabase( databasePath )
		self.datasetDict = datasetDict

	def start(self):
		self._createInfoNodes()
		self._finish()

	def _createInfoNodes( self ):
		print "Creating info nodes"
		# do all insertions within one transaction: complete failure or success!
		with self.db.transaction:
			metaVertex = self.db.node() #self.db.reference_node
			print "Meta node created, id %i" %( metaVertex.id )
			index = self.db.node.indexes.create('meta')
			index['meta']['meta'] = metaVertex

			for num, (label, patientFile) in enumerate( self.datasetDict.items() ):
				patientFile = open( patientFile, 'r')
				patientFile.readline() #header

				datasetVertex = self.db.node()
				datasetVertex['datalabel'] = label
				datasetVertex['barcode'] = patientFile.readline().strip("\n")

				metaVertex.relationships.create('DATASET', datasetVertex, label=label)
				patientFile.close()

	def _finish(self):
		self.db.shutdown()
		print "Infonodes created" 

 def test_must_use_valid_url_scheme(self):
     try:
         GraphDatabase.driver("x://xxx")
     except ValueError:
         assert True
     else:
         assert False

def showAllDB():
	db = GraphDatabase(workingdb)

	query = """START n=node(*)
				MATCH (n) - [r] -> (m)
				RETURN n.name, r, m.name"""

	print db.query(query)

	db.shutdown()

def get_rel_info(dbname,relid):        
    from neo4j import GraphDatabase
    from neo4j import OUTGOING, INCOMING, ANY
    db = GraphDatabase(dbname)
    relid = int(relid) #make sure it is an int
    rel = db.relationship[relid]
    print rel
    for key,value in rel.items():
        print "\t"+key,value
    db.shutdown()

def get_node_info(dbname,nodeid):
    from neo4j import GraphDatabase
    from neo4j import OUTGOING, INCOMING, ANY
    db = GraphDatabase(dbname)
    nodeid = int(nodeid) #make sure it is an int
    nd = db.node[nodeid]
    print nd
    for key,value in nd.items():
        print "\t"+key,value
        if "uniqname" in str(key):
            break
    db.shutdown()

def showAllRelations(qname):
	db = GraphDatabase(workingdb)


	query = """START n=node(*)
			   MATCH (n) - [r] -> (m)
			   WHERE HAS(n.name) AND n.name = {name}
			   RETURN n.name, r, m.name"""

	print db.query(query, name=qname)


	db.shutdown()

 def test_create_configured_db(self):
     folder_to_put_db_in = tempfile.mkdtemp()
     try:
         # START SNIPPET: creatingConfiguredDatabase
         from neo4j import GraphDatabase
         
         # Example configuration parameters
         db = GraphDatabase(folder_to_put_db_in, string_block_size=200, array_block_size=240)
         
         db.shutdown()
         # END SNIPPET: creatingConfiguredDatabase
     finally:
        if os.path.exists(folder_to_put_db_in):
           import shutil
           shutil.rmtree(folder_to_put_db_in)

 def test_can_run_simple_statement(self):
     session = GraphDatabase.driver("bolt://localhost").session()
     count = 0
     for record in session.run("RETURN 1 AS n"):
         assert record[0] == 1
         assert record["n"] == 1
         try:
             record["x"]
         except AttributeError:
             assert True
         else:
             assert False
         assert record.n == 1
         try:
             record.x
         except AttributeError:
             assert True
         else:
             assert False
         try:
             record[object()]
         except TypeError:
             assert True
         else:
             assert False
         assert repr(record)
         assert len(record) == 1
         count += 1
     session.close()
     assert count == 1

 def test_create_db(self):
     folder_to_put_db_in = tempfile.mkdtemp()
     try:
         # START SNIPPET: creatingDatabase
         from neo4j import GraphDatabase
         
         # Create db
         db = GraphDatabase(folder_to_put_db_in)
         
         # Always shut down your database
         db.shutdown()
         # END SNIPPET: creatingDatabase
     finally:
        if os.path.exists(folder_to_put_db_in):
           import shutil
           shutil.rmtree(folder_to_put_db_in)

    def __init__(self, options, columns):

        # Calling super constructor
        super(Neo4jForeignDataWrapper, self).__init__(options, columns)

        # Managed server option
        if 'url' not in options:
            log_to_postgres('The Bolt url parameter is required and the default is "bolt://localhost:7687"', WARNING)
        self.url = options.get("url", "bolt://localhost:7687")

        if 'user' not in options:
            log_to_postgres('The user parameter is required  and the default is "neo4j"', ERROR)
        self.user = options.get("user", "neo4j")

        if 'password' not in options:
            log_to_postgres('The password parameter is required for Neo4j', ERROR)
        self.password = options.get("password", "")

        if 'cypher' not in options:
            log_to_postgres('The cypher parameter is required', ERROR)
        self.cypher = options.get("cypher", "MATCH (n) RETURN n LIMIT 100")

        # Setting table columns
        self.columns = columns

        # Create a neo4j driver instance
        self.driver = GraphDatabase.driver( self.url, auth=basic_auth(self.user, self.password))

        self.columns_stat = self.compute_columns_stat()
        self.table_stat = int(options.get("estimated_rows", -1))
        if(self.table_stat < 0):
            self.table_stat = self.compute_table_stat()
        log_to_postgres('Table estimated rows : ' + unicode(self.table_stat), DEBUG)

 def test_fails_on_missing_parameter(self):
     session = GraphDatabase.driver("bolt://localhost").session()
     try:
         session.run("RETURN {x}").consume()
     except CypherError:
         assert True
     else:
         assert False

 def test_fails_on_bad_syntax(self):
     session = GraphDatabase.driver("bolt://localhost").session()
     try:
         session.run("X").consume()
     except CypherError:
         assert True
     else:
         assert False

 def test_can_obtain_summary_info(self):
     with GraphDatabase.driver("bolt://localhost").session() as session:
         result = session.run("CREATE (n) RETURN n")
         summary = result.summarize()
         assert summary.statement == "CREATE (n) RETURN n"
         assert summary.parameters == {}
         assert summary.statement_type == "rw"
         assert summary.statistics.nodes_created == 1

 def test_can_handle_cypher_error(self):
     with GraphDatabase.driver("bolt://localhost").session() as session:
         try:
             session.run("X")
         except CypherError:
             assert True
         else:
             assert False

 def test_can_run_statement_that_returns_multiple_records(self):
     session = GraphDatabase.driver("bolt://localhost").session()
     count = 0
     for record in session.run("unwind(range(1, 10)) AS z RETURN z"):
         assert 1 <= record[0] <= 10
         count += 1
     session.close()
     assert count == 10