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gh-95273: Improve sqlite3 class descriptions #95379

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Jul 29, 2022
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gh-95273: Improve sqlite3 class descriptions #95379

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gh-95273: Improve sqlite3 class descriptions
erlend-aasland Jul 28, 2022
7407e05
Address review
erlend-aasland Jul 29, 2022
dd332be
Update Doc/library/sqlite3.rst
Jul 29, 2022
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Update Doc/library/sqlite3.rst
Jul 29, 2022
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42 changes: 34 additions & 8 deletions Doc/library/sqlite3.rst
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Expand Up @@ -413,6 +413,16 @@ Connection Objects

.. class:: Connection

Each open SQLite database is represented by a ``Connection`` object,
which is created using :func:`sqlite3.connect`.
Their main purpose is creating :class:`Cursor` objects,
and :ref:`sqlite3-controlling-transactions`.

.. seealso::

* :ref:`sqlite3-connection-shortcuts`
* :ref:`sqlite3-connection-context-manager`

An SQLite database connection has the following attributes and methods:

.. attribute:: isolation_level
Expand Down Expand Up @@ -957,6 +967,22 @@ Connection Objects
Cursor Objects
--------------

A ``Cursor`` object represents a `database cursor`_
which is used to execute SQL statements,
and manage the context of a fetch operation.
Cursors are created with :meth:`Connection.cursor`,
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or by using any of the :ref:`connection shortcut methods
<sqlite3-connection-shortcuts>`.

Cursors objects are :term:`iterators <iterator>`,
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meaning that if you :meth:`~Cursor.execute` a ``SELECT`` query,
you can simply iterate over the cursor to fetch the resulting rows::

for row in cur.execute("select * from data"):
print(row)

.. _database cursor: https://en.wikipedia.org/wiki/Cursor_(databases)

.. class:: Cursor

A :class:`Cursor` instance has the following attributes and methods.
Expand Down Expand Up @@ -1113,13 +1139,11 @@ Row Objects

A :class:`Row` instance serves as a highly optimized
:attr:`~Connection.row_factory` for :class:`Connection` objects.
It tries to mimic a tuple in most of its features.
It tries to mimic a :class:`tuple` in most of its features,
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and supports iteration, :func:`repr`, equality testing, :func:`len`,
and :term:`mapping` access by column name and index.

It supports mapping access by column name and index, iteration,
representation, equality testing and :func:`len`.

If two :class:`Row` objects have exactly the same columns and their
members are equal, they compare equal.
Two row objects compare equal if have equal columns and equal members.

.. method:: keys

Expand Down Expand Up @@ -1618,8 +1642,10 @@ Using :mod:`sqlite3` efficiently
--------------------------------


Using shortcut methods
^^^^^^^^^^^^^^^^^^^^^^
.. _sqlite3-connection-shortcuts:

Using connection shortcut methods
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Using the nonstandard :meth:`execute`, :meth:`executemany` and
:meth:`executescript` methods of the :class:`Connection` object, your code can
Expand Down