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| author | Mike Bayer <mike_mp@zzzcomputing.com> | 2020-09-25 22:31:16 -0400 |
|---|---|---|
| committer | Mike Bayer <mike_mp@zzzcomputing.com> | 2020-10-31 13:44:53 -0400 |
| commit | 654b462d668a2ced4e87077b9babb2590acbf983 (patch) | |
| tree | 8b6023480423e990c9bbca7c280cb1cb58e012fc /doc/build/orm/loading_objects.rst | |
| parent | 841eb216644202567ebddfc0badc51a3a35e98c3 (diff) | |
| download | sqlalchemy-review/mike_bayer/tutorial20.tar.gz | |
tutorial 2.0 WIPreview/mike_bayer/tutorial20
Add SelectBase.exists() method as it seems strange this is
not available already. The Exists construct itself does
not provide full SELECT-building capabilities so it makes
sense this should be used more like a scalar_subquery.
Make sure stream_results is getting set up when yield_per
is used, for 2.0 style statements as well. this was
hardcoded inside of Query.yield_per() and is now moved
to take place within QueryContext.
Change-Id: Icafcd4fd9b708772343d56edf40995c9e8f835d6
Diffstat (limited to 'doc/build/orm/loading_objects.rst')
| -rw-r--r-- | doc/build/orm/loading_objects.rst | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/doc/build/orm/loading_objects.rst b/doc/build/orm/loading_objects.rst index b26b32087..3075ea9f4 100644 --- a/doc/build/orm/loading_objects.rst +++ b/doc/build/orm/loading_objects.rst @@ -1,14 +1,26 @@ -=============== -Loading Objects -=============== +=============================== +Querying Data, Loading Objects +=============================== -Notes and features regarding the general loading of mapped objects. +The following sections refer to techniques for emitting SELECT statements within +an ORM context. This involves primarily statements that return instances of +ORM mapped objects, but also involves calling forms that deliver individual +column or groups of columns as well. -For an in-depth introduction to querying with the SQLAlchemy ORM, please see the :ref:`ormtutorial_toplevel`. +For an introduction to querying with the SQLAlchemy ORM, one of the +following tutorials shoud be consulted: + +* :doc:`/tutorial/index` - for :term:`2.0 style` usage + +* :doc:`/orm/tutorial` - for :term:`1.x style` usage. + +As SQLAlchemy 1.4 represents a transition from 1.x to 2.0 style, the below +sections are currently mixed as far as which style they are using. .. toctree:: :maxdepth: 3 + queryguide loading_columns loading_relationships inheritance_loading |