大约有 47,000 项符合查询结果（耗时：0.0478秒） [XML]
Reload django object from database
...
As of Django 1.8 refreshing objects is built in. Link to docs.
def test_update_result(self):
obj = MyModel.objects.create(val=1)
MyModel.objects.filter(pk=obj.pk).update(val=F('val') + 1)
# At this point obj.val is still 1, b...
How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
...mented)
Modern Versions of PostgreSQL
Suppose you have a table named test1, to which you want to add an auto-incrementing, primary-key id (surrogate) column. The following command should be sufficient in recent versions of PostgreSQL:
ALTER TABLE test1 ADD COLUMN id SERIAL PRIMARY KEY;
Older...
Python's os.makedirs doesn't understand “~” in my path
...
281
You need to expand the tilde manually:
my_dir = os.path.expanduser('~/some_dir')
...
Nested rows with bootstrap grid system?
I want 1 larger image with 4 smaller images in a 2x2 format like this:
2 Answers
2
...
Android icon vs logo
...
119
The ActionBar will use the android:logo attribute of your manifest, if
one is provided. T...
What is the role of src and dist folders?
...
1 Answer
1
Active
...
Rails Model find where not equal
...
|
edited May 23 '17 at 12:10
Community♦
111 silver badge
answered Sep 12 '11 at 17:54
...
How to change webservice url endpoint?
...
174
IMO, the provider is telling you to change the service endpoint (i.e. where to reach the web s...
How to center a label text in WPF?
...
213
use the HorizontalContentAlignment property.
Sample
<Label HorizontalContentAlignment="Ce...
How can I access an object property named as a variable in php?
...
|
edited Apr 15 '19 at 14:45
answered Aug 18 '10 at 19:28
...