#32418: Django f expressions seems to not work with MySQL
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Reporter: HoshiYamazaki | Owner: nobody
Type: Bug | Status: new
Component: Uncategorized | Version: 3.1
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Description changed by HoshiYamazaki:
Old description:
> My code:
> ```python
> duration_expression = ExpressionWrapper(
> datetime.timedelta(minutes=1) * F('duration'),
> output_field=DurationField())
> booking_end = ExpressionWrapper(
> F('booking_dt') + duration_expression,
> output_field=DateTimeField())
> booking_qs.annotate(
> booking_end=booking_end).get(
> Q(Q(booking_dt__lte=first_interval),
> Q(booking_dt__gte=next_interval)) |
> Q(Q(booking_end__lte=first_interval),
> Q(booking_end__gte=next_interval)))duration_expression =
> ExpressionWrapper(
> datetime.timedelta(minutes=1) * F('duration'),
> output_field=DurationField())
> booking_end = ExpressionWrapper(
> F('booking_dt') + duration_expression,
> output_field=DateTimeField())
> booking_qs.annotate(
> booking_end=booking_end).get(
> Q(Q(booking_dt__lte=first_interval),
> Q(booking_dt__gte=next_interval)) |
> Q(Q(booking_end__lte=first_interval),
> Q(booking_end__gte=next_interval)))
> ```
>
> Error I get:
> ```
> (1064, "You have an error in your SQL syntax; check the manual that
> corresponds to your MySQL server version for the right syntax to use near
> '* `carwashes_carwashbooking`.`duration`) MICROSECOND) AS `booking_end`
> FROM `car' at line 1")
> ```
>
> SQL query:
> ```sql
> ('SELECT `carwashes_carwashbooking`.`id`, '
> '`carwashes_carwashbooking`.`carwash_id`, '
> '`carwashes_carwashbooking`.`created_dt`, '
> '`carwashes_carwashbooking`.`booking_dt`, '
> '`carwashes_carwashbooking`.`duration`,
> `carwashes_carwashbooking`.`car_id`, '
> '`carwashes_carwashbooking`.`car_name`,
> `carwashes_carwashbooking`.`plate`, '
> '`carwashes_carwashbooking`.`status`,
> `carwashes_carwashbooking`.`driver_id`, '
> '`carwashes_carwashbooking`.`phone_number`, '
> '`carwashes_carwashbooking`.`service_id`,
> `carwashes_carwashbooking`.`notes`, '
> '(`carwashes_carwashbooking`.`booking_dt` + INTERVAL (INTERVAL 60000000
> '
> 'MICROSECOND * `carwashes_carwashbooking`.`duration`) MICROSECOND) AS '
> '`booking_end` FROM `carwashes_carwashbooking` WHERE '
> '(`carwashes_carwashbooking`.`carwash_id` = %s AND '
> '`carwashes_carwashbooking`.`driver_id` = %s AND '
> '((`carwashes_carwashbooking`.`booking_dt` <= %s AND '
> '`carwashes_carwashbooking`.`booking_dt` >= %s) OR '
> '((`carwashes_carwashbooking`.`booking_dt` + INTERVAL (INTERVAL 60000000
> '
> 'MICROSECOND * `carwashes_carwashbooking`.`duration`) MICROSECOND) <= %s
> AND '
> '(`carwashes_carwashbooking`.`booking_dt` + INTERVAL (INTERVAL 60000000
> '
> 'MICROSECOND * `carwashes_carwashbooking`.`duration`) MICROSECOND) >=
> %s))) '
> 'LIMIT 21')
> ```
>
> Stackoverflow issue: https://stackoverflow.com/questions/66044255/django-
> returns-sql-syntax-error-when-using-expressionwrapper-and-f-expressions
New description:
My code:
{{{
duration_expression = ExpressionWrapper(
datetime.timedelta(minutes=1) * F('duration'),
output_field=DurationField())
booking_end = ExpressionWrapper(
F('booking_dt') + duration_expression,
output_field=DateTimeField())
booking_qs.annotate(
booking_end=booking_end).get(
Q(Q(booking_dt__lte=first_interval),
Q(booking_dt__gte=next_interval)) |
Q(Q(booking_end__lte=first_interval),
Q(booking_end__gte=next_interval)))duration_expression =
ExpressionWrapper(
datetime.timedelta(minutes=1) * F('duration'),
output_field=DurationField())
booking_end = ExpressionWrapper(
F('booking_dt') + duration_expression,
output_field=DateTimeField())
booking_qs.annotate(
booking_end=booking_end).get(
Q(Q(booking_dt__lte=first_interval),
Q(booking_dt__gte=next_interval)) |
Q(Q(booking_end__lte=first_interval),
Q(booking_end__gte=next_interval)))
}}}
Error I get:
{{{
(1064, "You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near
'* `carwashes_carwashbooking`.`duration`) MICROSECOND) AS `booking_end`
FROM `car' at line 1")
}}}
SQL query:
{{{
('SELECT `carwashes_carwashbooking`.`id`, '
'`carwashes_carwashbooking`.`carwash_id`, '
'`carwashes_carwashbooking`.`created_dt`, '
'`carwashes_carwashbooking`.`booking_dt`, '
'`carwashes_carwashbooking`.`duration`,
`carwashes_carwashbooking`.`car_id`, '
'`carwashes_carwashbooking`.`car_name`,
`carwashes_carwashbooking`.`plate`, '
'`carwashes_carwashbooking`.`status`,
`carwashes_carwashbooking`.`driver_id`, '
'`carwashes_carwashbooking`.`phone_number`, '
'`carwashes_carwashbooking`.`service_id`,
`carwashes_carwashbooking`.`notes`, '
'(`carwashes_carwashbooking`.`booking_dt` + INTERVAL (INTERVAL 60000000 '
'MICROSECOND * `carwashes_carwashbooking`.`duration`) MICROSECOND) AS '
'`booking_end` FROM `carwashes_carwashbooking` WHERE '
'(`carwashes_carwashbooking`.`carwash_id` = %s AND '
'`carwashes_carwashbooking`.`driver_id` = %s AND '
'((`carwashes_carwashbooking`.`booking_dt` <= %s AND '
'`carwashes_carwashbooking`.`booking_dt` >= %s) OR '
'((`carwashes_carwashbooking`.`booking_dt` + INTERVAL (INTERVAL 60000000
'
'MICROSECOND * `carwashes_carwashbooking`.`duration`) MICROSECOND) <= %s
AND '
'(`carwashes_carwashbooking`.`booking_dt` + INTERVAL (INTERVAL 60000000 '
'MICROSECOND * `carwashes_carwashbooking`.`duration`) MICROSECOND) >=
%s))) '
'LIMIT 21')
}}}
Stackoverflow issue: https://stackoverflow.com/questions/66044255/django-
returns-sql-syntax-error-when-using-expressionwrapper-and-f-expressions
--
--
Ticket URL: <https://code.djangoproject.com/ticket/32418#comment:1>
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