大约有 10,900 项符合查询结果（耗时：0.0505秒） [XML]
SQLAlchemy: What's the difference between flush() and commit()?
...
A Session object is basically an ongoing transaction of changes to a database (update, insert, delete). These operations aren't persisted to the database until they are committed (if your program aborts for some reason in mid-session transaction, an...
reference assignment is atomic so why is Interlocked.Exchange(ref Object, Object) needed?
...Data ) is refreshed once in a while and I do it by creating another object called newData and fill it's data structures with new data. When it's done I just assign
...
Is null reference possible?
... to a valid object or function.
[Note: in particular, a null reference
cannot exist in a well-defined
program, because the only way to
create such a reference would be to
bind it to the “object” obtained by
dereferencing a null pointer, which
causes undefined behavior. As
describ...
Comparing Haskell's Snap and Yesod web frameworks
... host of projects on hackage. Most (all?) of them are listed in the Yesod category. Some of the notable ones are yesod-core, warp, persistent, and hamlet.
The reality of Haskell web development is that it's much less of an exclusive-or choice than seems to be perceived. In general the projects a...
AngularJS : Where to use promises?
...
Let's set aside AngularJS for a moment and just consider the Facebook API calls. Both the API calls use a callback mechanism to notify the caller when the response from Facebook is available:
facebook.FB.api('/' + item, function (result) {
if (result.error) {
// handle error
} els...
Perl build, unit testing, code coverage: A complete working example
...n there. There's absolutely nothing wrong with pointing to CPAN modules because that's where the full documentation is supposed to reside. I've had trouble finding complete working code examples in many cases, though.
...
Do I need a Global.asax.cs file at all if I'm using an OWIN Startup.cs class and move all configurat
Let's say for example in a brand new ASP.NET MVC 5 application made from the MVC with Individual Accounts template, if I delete the Global.asax.cs class and move it's configuration code to Startup.cs Configuration() method as follow, what are the downsides?
...
Elegant setup of Python logging in Django
...d so far is to initialize logging setup in settings.py - nowhere else. You can either use a configuration file or do it programmatically step-by-step - it just depends on your requirements. The key thing is that I usually add the handlers I want to the root logger, using levels and sometimes logging...
What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters?
...
What is wchar_t?
wchar_t is defined such that any locale's char encoding can be converted to a wchar_t representation where every wchar_t represents exactly one codepoint:
Type wchar_t is a distinct type whose values can represent distinct codes for all members of the larg...
Is it .yaml or .yml?
...d its ilk), while in still others they have definite semantics and in some cases specific limits on length or character content (Windows, etc.).
Since the maintainers have asked that you use ".yaml", that's as close to an "official" ruling as you can get, but the habit of 8.3 is hard to get out of ...