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Code Issues 32 Releases Wiki Activity

Fixed #27587 -- Adding examples of QuerySet.query.__str__() to docs.

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This commit is contained in:
Josiah White 2022-10-20 11:42:10 -07:00
parent d62563cbb1
commit c32a7651a2
2 changed files with 20 additions and 1 deletions
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8
docs/intro/tutorial02.txt
View File

@ -473,8 +473,14 @@ Save these changes and start a new Python interactive shell by running
>>> from polls.models import Choice, Question
# Make sure our __str__() addition worked.
>>> Question.objects.all()
>>> q = Question.objects.all()
>>> q
<QuerySet [<Question: What's up?>]>
# Print the SQL used to query the database
>>> from pprint import pprint
>>> pprint(str(q.query))
('SELECT "polls_question"."id", "polls_question"."question_text", '
'"polls_question"."pub_date" FROM "polls_question"')
# Django provides a rich database lookup API that's entirely driven by
# keyword arguments.

13
docs/topics/db/queries.txt
View File

@ -336,6 +336,19 @@ objects from the database. However, that's far from all there is; see the
:ref:`QuerySet API Reference <queryset-api>` for a complete list of all the
various :class:`~django.db.models.query.QuerySet` methods.
Printing the ``QuerySet`` SQL
--------------------------
When debugging a query, it may be useful to see the SQL generated by a
queryset. You may do this by converting the ``query`` attribute to a string.
>>> q = Entry.objects.all()
>>> str(q.query)
This prints the SQL that is used to query the database. From there, you may
looks for unexpected clauses, etc.
.. _limiting-querysets:
Limiting ``QuerySet``\s