thread_pool use PooledDB InvalidConnection

[QscvGYU]

def __getattr__(self, name):
    """Proxy all members of the class."""
    if self._con:
        return getattr(self._con, name)
    else:
        raise InvalidConnection

name = 'commit'

[Cito]

Looks like you commit on a shared or dedicated connection that has been closed.

Please send a complete reproducible test case, explain what you expect and what happened instead.