大约有 17,000 项符合查询结果（耗时：0.0309秒） [XML]
Flask-SQLalchemy update a row's information
...itself. Then, db.session.commit().
For example:
admin = User.query.filter_by(username='admin').first()
admin.email = 'my_new_email@example.com'
db.session.commit()
user = User.query.get(5)
user.name = 'New Name'
db.session.commit()
Flask-SQLAlchemy is based on SQLAlchemy, so be sure to check ou...
Django: Get model from string?
...
As of Django 3.0, it's AppConfig.get_model(model_name, require_ready=True)
As of Django 1.9 the method is django.apps.AppConfig.get_model(model_name).
-- danihp
As of Django 1.7 the django.db.models.loading is deprecated (to be removed in 1.9) in favor of t...
Rename multiple files by replacing a particular pattern in the filenames using a shell script [dupli
...a pattern. For example following command will prepend string MyVacation2011_ to all the files with jpg extension.
rename 's/^/MyVacation2011_/g' *.jpg
or
rename <pattern> <replacement> <file-list>
sha...
Open URL in same window and in same tab
...eed to use the name attribute:
window.open("https://www.youraddress.com","_self")
Edit: Url should be prepended with protocol. Without it tries to open relative url. Tested in Chrome 59, Firefox 54 and IE 11.
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How to write iOS app purely in C
...or parameters passed in remain the same whether or not
// you are using VA_ARGS. This is actually the basis of the objective-c
// runtime (objc_msgSend), so we are probably fine here, this would be
// the last thing I would expect to break.
extern int UIApplicationMain(int, ...);
// Entry point ...
Converting a Java collection into a Scala collection
... but you can also avoid using jcl.Buffer:
Set(javaApi.query(...).toArray: _*)
Note that scala.collection.immutable.Set is made available by default thanks to Predef.scala.
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How to replace multiple strings in a file using PowerShell
... PowerShell to continue parsing the expression on the next line:
$original_file = 'path\filename.abc'
$destination_file = 'path\filename.abc.new'
(Get-Content $original_file) | Foreach-Object {
$_ -replace 'something1', 'something1aa' `
-replace 'something2', 'something2bb' `
-re...
Stripping everything but alphanumeric chars from a string in Python
...ng.printable (part of the built-in string module). The use of compiled '[\W_]+' and pattern.sub('', str) was found to be fastest.
$ python -m timeit -s \
"import string" \
"''.join(ch for ch in string.printable if ch.isalnum())"
10000 loops, best of 3: 57.6 usec per loop
$ python -m tim...
Is there a command to refresh environment variables from the command prompt in Windows?
...
:SetFromReg
"%WinDir%\System32\Reg" QUERY "%~1" /v "%~2" > "%TEMP%\_envset.tmp" 2>NUL
for /f "usebackq skip=2 tokens=2,*" %%A IN ("%TEMP%\_envset.tmp") do (
echo/set %~3=%%B
)
goto :EOF
:: Get a list of environment variables from registry
:GetRegEnv
"%WinDir%\Syst...
Rails: around_* callbacks
...classes/ActiveRecord/Callbacks.html , but don't understand when the around_* callbacks are triggered in relation to before_* and after_* .
...