def get_col(cls, db_conn_uri=None):
"""
链接数据库
"""
db = Mongo.get_instance(db_conn_uri) if db_conn_uri else Mongo.get_db()
return db[cls._col_name]
def _get_col(cls, db_conn_uri=None):
"""
链接数据库
:param db_conn_uri: 链接配置
:return: 链接句柄
"""
db = Mongo.get_instance(db_conn_uri) if db_conn_uri else Mongo.get_db()
return db[cls.__col_name]