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Fixed #34409 -- Doc'd limitation of dictfetchall() and namedtuplefetchall() examples.

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Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>
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Jesper Olsson 2023-03-22 19:20:58 +01:00 committed by GitHub
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1 changed files with 11 additions and 2 deletions
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docs/topics/db/sql.txt
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@ -323,7 +323,10 @@ small performance and memory cost, you can return results as a ``dict`` by
using something like this:: using something like this::
def dictfetchall(cursor): def dictfetchall(cursor):
"Return all rows from a cursor as a dict" """
Return all rows from a cursor as a dict.
Assume the column names are unique.
"""
columns = [col[0] for col in cursor.description] columns = [col[0] for col in cursor.description]
return [dict(zip(columns, row)) for row in cursor.fetchall()] return [dict(zip(columns, row)) for row in cursor.fetchall()]
@ -336,11 +339,17 @@ immutable and accessible by field names or indices, which might be useful::
def namedtuplefetchall(cursor): def namedtuplefetchall(cursor):
"Return all rows from a cursor as a namedtuple" """
Return all rows from a cursor as a namedtuple.
Assume the column names are unique.
"""
desc = cursor.description desc = cursor.description
nt_result = namedtuple("Result", [col[0] for col in desc]) nt_result = namedtuple("Result", [col[0] for col in desc])
return [nt_result(*row) for row in cursor.fetchall()] return [nt_result(*row) for row in cursor.fetchall()]
The ``dictfetchall()`` and ``namedtuplefetchall()`` examples assume unique
column names, since a cursor cannot distinguish columns from different tables.
Here is an example of the difference between the three: Here is an example of the difference between the three:
.. code-block:: pycon .. code-block:: pycon