我有一个错误
pymysql.err.InternalError: Packet sequence number wrong - got 0 expected 1
在让我的应用程序空闲(0 个对 DB 的请求)几个小时后。我想,数据库模块会创建连接池(确实如此)并在超时后自动重新创建连接,但事实并非如此。
要求 - Python 3.8、FastAPI、数据库[mysql]。
有任何想法吗 ?
主文件
.......
@app.on_event("startup")
async def startup():
await db.connect()
@app.on_event("shutdown")
async def shutdown():
await db.disconnect()
.......
db_config.py
import databases
import sqlalchemy
import os
import logging
from functools import wraps
HOST = 'mysql://user:user_passw@{host}:{port}/sw_database'.format(host=os.environ.get("DB_HOST", "127.0.0.1"),
port=os.environ.get("DB_PORT", "3306"))
db = databases.Database(HOST)
metadata = sqlalchemy.MetaData()
logger = logging.getLogger(__name__)
def perform_transaction(foo):
@wraps(foo)
async def decorate(*args, **kwargs):
async with db.connection() as connection:
async with connection.transaction():
try:
res = await foo(*args, **kwargs)
except Exception as e:
logger.error(e)
return []
return res
return decorate
端点示例
from fastapi import APIRouter
from db_config import db, perform_transaction
router = APIRouter()
@router.get('/devices_list', responses=responses_for_devices_table)
@perform_transaction
async def get_devices_list():
query = devices.select()
return await db.fetch_all(query)