使用Python 2.7.9,我正在尝试分解MySQL连接和光标的开口和关闭
代码是
class MySQLCursor:
def __init__(self, commit=False):
self.commit = commit
def __enter__(self):
self.conn = MySQLdb.connect(host=_MYMYSQLHOST,
user=_MYMYSQLUSER,
passwd=_MYMYSQLPASSWD,
db=_MYMYSQLDB)
self.cursor = self.conn.cursor()
return self.cursor
def __exit__(self, exc_type, exc_val, exc_tb):
if self.commit:
self.conn.commit()
self.cursor.close()
self.conn.close()
return
使用它为
with MySQLCursor as cursor:
cursor.execute("SELECT VERSION()")
row = cursor.fetchone()
print "server version:", row[0]
我收到错误消息
AttributeError: __exit__
这是一个MySQL问题还是上下文管理器问题?
只是做 with MySQLCursor() as cursor:
-带有语句的实例需要具有__enter__
和__exit__
方法的类实例,而不是类本身。