| | |
|---|
| | | :linenos: |
|---|
| | | :language: py |
|---|
| | | |
|---|
| | | ``scoped_session`` and ``sessionmaker`` are standard SQLAlchemy helpers. |
|---|
| | | ``scoped_session`` allows us to access our database connection globally. |
|---|
| | | ``sessionmaker`` creates a database session object. We pass to |
|---|
| | | ``sessionmaker`` the ``extension=ZopeTransactionExtension()`` extension |
|---|
| | | option in order to allow the system to automatically manage datbase |
|---|
| | | transactions. With ``ZopeTransactionExtension`` activated, our application |
|---|
| | | will automatically issue a transaction commit after every request unless an |
|---|
| | | exception is raised, in which case the transaction will be aborted. |
|---|
| | | |
|---|
| | | We also need to create a declarative ``Base`` object to use as a |
|---|
| | | base class for our model: |
|---|
| | | |
|---|
