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python - weakly-referenced object no longer exists? 数据库连接关闭问题

#! python3
import mysql.connector
class A:
    def __init__(self):
        self.dbconfig = {....}
        self.conn = mysql.connector.connect(**self.dbconfig)
        self.cur = self.conn.cursor()
    def __del__(self):
        self.cur.close()
        self.conn.close()

数据库连接也成功了,但是执行完该类后就会报错:

Exception ignored in: <bound method A.__del__ of <__main__.**** object at 0x0000000001151358>>
Traceback (most recent call last):
  File "****.py", line *, in __del__
  File "*****\Python35\lib\site-packages\mysql\connector\cursor.py", line 344, in close
ReferenceError: weakly-referenced object no longer exists

还请知道什么原因的司机解惑!万分感谢!
按stackoverflow上的方案就是我写的这样,但是还是有问题,难道是我的翻译软件有问题?

PHP中文网PHP中文网2818 days ago1445

reply all(2)I'll reply

  • 伊谢尔伦

    伊谢尔伦2017-04-18 10:25:32

    Okay, answer it yourself. I don’t know what caused the error. I’ll answer it later when my level is higher. Temporary solution:

    import mysql.connector
    class A:
        def __init__(self):
            self.dbconfig = {...}
            try:
                self.conn = mysql.connector.connect(**self.dbconfig)
                self.cur = self.conn.cursor()
                print('mysql conn success!')
            except:
                print("mysql conn error!")
    
        def __del__(self):
            #if self.cur:
            #    self.cur.close()
            if self.conn:
                self.conn.close()
    if __name__ == '__main__':
        a = A()

    Supplement:
    It turns out that you cannot close the cursor in __del__()

    reply
    0
  • 怪我咯

    怪我咯2017-04-18 10:25:32

    It may be that your configuration is wrong and you are not connected to mysql
    If this code self.cur = self.conn.cursor() reports an error, it means you are not connected

    reply
    0
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