def db(self, name='_system', username='******', password='', verify=False):
"""Connect to an ArangoDB database and return the database API wrapper.
:param name: Database name.
:type name: str | unicode
:param username: Username for basic authentication.
:type username: str | unicode
:param password: Password for basic authentication.
:type password: str | unicode
:param verify: Verify the connection by sending a test request.
:type verify: bool
:return: Standard database API wrapper.
:rtype: arango.database.StandardDatabase
:raise arango.exceptions.ServerConnectionError: If **verify** was set
to True and the connection fails.
"""
connection = Connection(hosts=self._hosts,
host_resolver=self._host_resolver,
sessions=self._sessions,
db_name=name,
username=username,
password=password,
http_client=self._http,
serializer=self._serializer,
deserializer=self._deserializer)
if verify:
try:
connection.ping()
except ServerConnectionError as err:
raise err
except Exception as err:
raise ServerConnectionError('bad connection: {}'.format(err))
return StandardDatabase(connection)
