返回的连接对象的游标对象执行sql语句的时候发生了bug

Describe the bug

To Reproduce

async with GetDBConnectionContext() as conn: async with conn.cursor() as cur: await cur.execute("SELECT * FROM user WHERE username=%s", (username,)) bug发生

Expected behavior

返回的连接对象中的游标对象成功执行sql语句并返回结果

Logs/tracebacks

[2024-05-11 14:11:30.069| ERROR    |MainThread|mysql.login_user|UserControllers.py:57]: 登录用户时发生错
误: 'NoneType' object has no attribute 'send' 
Traceback (most recent call last):
  File "f:\python_play\furina-fastapi-backend\backend\utils\UserControllers.py", line 34, in login_user  
    await cur.execute("SELECT * FROM user WHERE username=%s", (username,))
  File "G:\python3.12.3\Lib\site-packages\aiomysql\cursors.py", line 239, in execute
    await self._query(query)
  File "G:\python3.12.3\Lib\site-packages\aiomysql\cursors.py", line 457, in _query
    await conn.query(q)
  File "G:\python3.12.3\Lib\site-packages\aiomysql\connection.py", line 468, in query
    await self._execute_command(COMMAND.COM_QUERY, sql)
  File "G:\python3.12.3\Lib\site-packages\aiomysql\connection.py", line 724, in _execute_command
    self._write_bytes(prelude + sql[:chunk_size - 1])
  File "G:\python3.12.3\Lib\site-packages\aiomysql\connection.py", line 669, in _write_bytes
    return self._writer.write(data)
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "G:\python3.12.3\Lib\asyncio\streams.py", line 346, in write
    self._transport.write(data)
  File "G:\python3.12.3\Lib\asyncio\proactor_events.py", line 366, in write
    self._loop_writing(data=bytes(data))
  File "G:\python3.12.3\Lib\asyncio\proactor_events.py", line 402, in _loop_writing
    self._write_fut = self._loop._proactor.send(self._sock, data)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'send'

Python Version

$ python --version
3.12.3

aiomysql Version

$ python -m pip show aiomysql
Name: aiomysql
Version: 0.2.0
Summary: MySQL driver for asyncio.
Home-page: https://github.com/aio-libs/aiomysql
Author: Nikolay Novik
Author-email: nickolainovik@gmail.com
License: MIT
Location: G:\python3.12.3\Lib\site-packages
Requires: PyMySQL
Required-by:

PyMySQL Version

$ python -m pip show PyMySQL
Name: PyMySQL
Version: 1.1.0
Summary: Pure Python MySQL Driver
Home-page:
Author:
Author-email: Inada Naoki <songofacandy@gmail.com>, Yutaka Matsubara <yutaka.matsubara@gmail.com>
License: MIT License
Location: G:\python3.12.3\Lib\site-packages
Requires:
Required-by: aiomysql

SQLAlchemy Version

$ python -m pip show sqlalchemy

OS

windows

Database type and version

SELECT VERSION();
8.4.0

Additional context

No response

Code of Conduct

[X] I agree to follow the aio-libs Code of Conduct

aio-libs / aiomysql

返回的连接对象的游标对象执行sql语句的时候发生了bug #985