pyorientdb的学习笔记

pyorientdb的学习笔记：

pyorient 是用 socket(tcp) 连接 OrientDB Server.

其中使用了 select 做高并发

https://github.com/mogui/pyorient/blob/master/pyorient/orient.py

    def write(self, buff):
        # This is a trick to detect server disconnection
        # or broken line issues because of
        """:see: https://docs.python.org/2/howto/sockets.html#when-sockets-die """

        try:
            _, ready_to_write, in_error = select.select(
                [], [self._socket], [self._socket], 1)
        except select.error as e:
            self.connected = False
            self._socket.close()
            raise e

        if not in_error and ready_to_write:
            self._socket.sendall(buff)
            return len(buff)
        else:
            self.connected = False
            self._socket.close()
            raise PyOrientConnectionException("Socket error", [])

    # DATABASE COMMANDS

    def gremlin(self, *args):
        return self.get_message("CommandMessage") \
            .prepare(( QUERY_GREMLIN, ) + args).send().fetch_response()

    def command(self, *args):
        return self.get_message("CommandMessage") \
            .prepare(( QUERY_CMD, ) + args).send().fetch_response()

    def batch(self, *args):
        return self.get_message("CommandMessage") \
            .prepare(( QUERY_SCRIPT, ) + args).send().fetch_response()

    def query(self, *args):
        return self.get_message("CommandMessage") \
            .prepare(( QUERY_SYNC, ) + args).send().fetch_response()

    def query_async(self, *args):
        return self.get_message("CommandMessage") \
            .prepare(( QUERY_ASYNC, ) + args).send().fetch_response()

    def db_create(self, name, type=DB_TYPE_DOCUMENT, storage=STORAGE_TYPE_PLOCAL):
        '''Creates a database in the remote OrientDB server instance.
        :param name: the name of the database to create. Example: "MyDatabase".
        :param type: the type of the database to create. Can be either document or graph. [default: DB_TYPE_DOCUMENT]
        :param storage:  specifies the storage type of the database to create. It can be one of the supported types [default: STORAGE_TYPE_PLOCAL]:
            - STORAGE_TYPE_PLOCAL - persistent database
            - STORAGE_TYPE_MEMORY - volatile database
        :return: None
        Usage::
            >>> from pyorient import OrientDB
            >>> client = OrientDB("localhost", 2424)
            >>> client.connect('root', 'root')
            >>> client.db_create('test')
        '''
        self.get_message("DbCreateMessage") \
            .prepare((name, type, storage)).send().fetch_response()
        return None

http://orientdb.com/docs/last/PyOrient.html

https://github.com/mogui/pyorient

简介:

自己...