sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away

报错如下：

 

CR.CR_SERVER_GONE_ERROR, "MySQL server has gone away (%r)" % (e,)

sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away

 

 

 

解决办法：

app.config['SQLALCHEMY_POOL_RECYCLE'] = 200 （小于数据库连接）