peewee.InterfaceError: (0, '')

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问题

使用flask搭了一个服务,用到了peewee模块,运行时间长了就报错

peewee.InterfaceError: (0, '')

百度上一搜,发现有自己的文章

peewee: OperationalError: (2006, ‘MySQL server has gone away’)

那个时候,处理的是peewee2版本的问题,如今又在处理peewee3的问题,真是问题多多

解决

查看peewee的issue,看到一个回到,给出两个方案
1、使用flask-peewee 模块
2、使用flask的钩子函数

尝试使用方案2:
request来的时候打开数据库连接,response返回的时候关闭数据库连接

根据文档给出的代码

from flask import Flask
from peewee import *

database = SqliteDatabase('my_app.db')
app = Flask(__name__)

# This hook ensures that a connection is opened to handle any queries
# generated by the request.
@app.before_request
def _db_connect():
    database.connect()

# This hook ensures that the connection is closed when we've finished
# processing the request.
@app.teardown_request
def _db_close(exc):
    if not database.is_closed():
        database.close()

参考:

  1. https://github.com/coleifer/peewee/issues/1546
  2. http://docs.peewee-orm.com/en/latest/peewee/database.html#flask
  3. http://docs.peewee-orm.com/en/latest/peewee/database.html#error-2006-mysql-server-has-gone-away

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