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Diffstat (limited to 'doc/build')
| -rw-r--r-- | doc/build/content/datamapping.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/build/content/datamapping.txt b/doc/build/content/datamapping.txt index 6308c8d7b..37afa0fd5 100644 --- a/doc/build/content/datamapping.txt +++ b/doc/build/content/datamapping.txt @@ -108,6 +108,12 @@ We're now ready to start talking to the database. The ORM's "handle" to the dat >>> from sqlalchemy.orm import sessionmaker >>> Session = sessionmaker(bind=engine, autoflush=True, transactional=True) +If you don't have an `Engine` yet, but want to define `Session`, define it without `bind`, and set the `bind` parameter later: + + {python} + >>> Session = sessionmaker(autoflush=True, transactional=True) + >>> Session.configure(bind=engine) # once engine is available + This `Session` class will create new `Session` objects which are bound to our database and have some various transactional characteristics. Whenever you need to have a conversation with the database, you instantiate a `Session`: {python} |