what is the right way connect a database manly.

[imfht]

What happened

my code is like:

class User(db.Entity):
    id = PrimaryKey(int, auto=True)
   name = Optional(str)
db.bind("pymysql","")
db.generate_mapping()
@db_session
def long_time_task():
     # long long task

if __name__==__main__:
    while True:
        long_time_task()

when long time task run first time. everything is ok.
when it run into third time. pony raise an exception

ony.orm.dbapiprovider.OperationalError: (2013, 'Lost connection to MySQL server during query')

what do I want

I want to catch the exception and reconnect the database. I read the document but only found a discount() method(no connect method.).

Someone help me?
Thanks