我有以下内容:
class DBConnection:
def __init__(self, DB_HOST, DB_PORT, DB_USER, DB_PASSWORD, DB_NAME):
self.host = DB_HOST
self.port = DB_PORT
self.name = DB_NAME
self.user = DB_USER
self.password = DB_PASSWORD
self.conn = None
self.cursor = None
def get_conn(self):
if self.conn is None:
self.conn = MySQLdb.connect (host = self.host, port = self.port, db = self.name, user = self.user, passwd = self.password)
return self.conn
def close_conn(self):
if self.conn:
self.conn.close()
return self.conn
这是我尝试重新连接时的样子:
>>> from db_conn import DBConnection
>>> db = DBConnection(DB_HOST, DB_PORT, DB_USER, DB_PASSWORD, DB_NAME)
>>> db.get_conn()
<_mysql.connection open to '127.0.0.1' at 7fbb1b8a2420>
>>> db.close_conn()
>>> db.conn
<_mysql.connection closed at 7fbb1b8a2420>
>>> db.get_conn()
<_mysql.connection closed at 7fbb1b8a2420>
为什么它不允许我重新打开连接?我将如何重新打开它,或者我需要创建一个新实例?