what is the actual reason that MySQL is disconnecting, is it actually being
restarted while the operation proceeds ? running a long query shouldn't
cause the connection to die off unless something goes wrong with the operation.
On Apr 1, 2013, at 10:04 PM, algotr8...@gmail.com wrote:
> I am using the sqlalchemy package in python. I have an operation that takes
> some time to execute after I perform an autoload on an existing table. This
> causes the following error when I attempt to use the connection:
>
> sqlalchemy.exc.OperationalError: (OperationalError) (2006, 'MySQL server has
> gone away')
>
> I have a simple utility function that performs an insert many:
>
> def insert_data(data_2_insert, table_name):
> engine = create_engine('mysql://blah:blah123@localhost/dbname')
> # Metadata is a Table catalog.
> metadata = MetaData()
> table = Table(table_name, metadata, autoload=True, autoload_with=engine)
> for c in mytable.c:
> print c
> column_names = tuple(c.name for c in mytable.c)
> final_data = [dict(zip(column_names, x)) for x in data_2_insert]
> ins = mytable.insert()
> conn = engine.connect()
> conn.execute(ins, final_data)
> conn.close()
>
> It is the following line that times long time to execute since
> 'data_2_insert' has 677,161 rows.
>
> final_data = [dict(zip(column_names, x)) for x in data_2_insert]
>
> I came across the following post below which refers to a similar problem,
> however I am not sure how to implement the connection management suggested as
> I am quite a newbie.
>
> http://stackoverflow.com/questions/3033234/handle-mysql-restart-in-sqlalchemy
>
> Note for SQLAlchemy 0.7 - PoolListener is deprecated, but The same solution
> can be implemented using the new event system. – robots.jpg
>
> Here is the link to the new event system described by one of the users:
>
> http://docs.sqlalchemy.org/en/latest/core/pooling.html#disconnect-handling-pessimistic
>
> If someone can please show me a couple of pointers on how I could go about
> integrating the suggestions into the way I use sqlalchemy I would be very
> appreciative. Thank you.
>
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