'init DB Client
:return:'

def __initDbClient(self):

    __type = None
    if ('SSDB' == self.config.db_type):
        __type = 'SsdbClient'
    elif ('REDIS' == self.config.db_type):
        __type = 'RedisClient'
    else:
        pass
    assert __type, 'type    error,    Not    support    DB    type:    {}'.format(self.config.db_type)
    self.client = getattr(__import__(__type), __type)(name=self.config.db_name, host=self.config.db_host, port=self.config.db_port)
