Upon successfully connecting to the database, this function returns a connection object, which is required in the subsequent database read and write operations.
如果成功地连接到数据库，这个函数会返回一个连接对象，后续的数据库读写操作需要使用这个对象。
2
If you want to do it as a function of buckets and, so you have a big pipe connecting two buckets that are just offset from each other.
如果你想把它作为桶函数，你有一个大水管连接两个桶，它们此消彼长。
3
From there it's just a matter of connecting the log QPushButton's clicked signal to the new function.