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SQLAlchemy: What's the difference between flush() and commit()?
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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, any uncommitted changes within are lost).
The sess...
Android - Activity vs FragmentActivity? [duplicate]
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As we know, mostly we have a BaseActivity in our project, and all the other activities will extend it.But when comes to FragmentActivity, we can't do it. So I don't use FragmentActivity even in the case of tab.
– Allen Vork
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Comparing Haskell's Snap and Yesod web frameworks
...ll.
Snap does have sessions and authentication, interfaces to several databases, and nice form handling (here and here) using digestive-functors that includes prepackaged support for arbitrarily nested dynamically sizable lists. These are just some of the growing ecosystem of pluggable snaplets. ...
Should CSS always preceed Javascript?
... before CSS will have a performance penalty on 15% of users globally; YMMV based on your site's specific audience. (And remember that number is shrinking.)
On mobile browsers, it's a little harder to get definitive numbers simply due to how heterogeneous the mobile browser and OS landscape is. Si...
Do I need a Global.asax.cs file at all if I'm using an OWIN Startup.cs class and move all configurat
... those looking for the complete steps: If you are looking to create a OWIN based, IIS hosted web API, these steps should get you there:
File -> New -> Project
In the dialogue, Installed -> templates -> Other Project types -> Visual Studio Solutions -> Blank Solution targeting .NE...
Which HTML Parser is the best? [closed]
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I suggest Validator.nu's parser, based on the HTML5 parsing algorithm. It is the parser used in Mozilla from 2010-05-03
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git + LaTeX workflow
...itive\n";
else
dire=$(dirname $PWD/$1);
based=$(git rev-parse --show-toplevel);
git show HEAD~$2:$(echo $dire| sed 's!'$(echo $based)'/!!')/$1 > $1_diff.tmp;
latexdiff $1 $1_diff.tmp > $1_diff.tex;
pdflatex $1_diff.te...
How do I make a list of data frames?
...Splitting a data frame into a list of data frames
This is super-easy, the base function split() does it for you. You can split by a column (or columns) of the data, or by anything else you want
mt_list = split(mtcars, f = mtcars$cyl)
# This gives a list of three data frames, one for each value of ...
What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters?
...its encoding and even its data type, making it unusable with any non-TCHAR based API. Since its purpose is migration to wchar_t, which we've seen above isn't a good idea, there is no value whatsoever in using TCHAR.
1. Characters which are representable in wchar_t strings but which are not suppo...
Laravel - Route::resource vs Route::controller
...ler something like this (actions = methods)
class UsersController extends BaseController {
public function index() {}
public function show($id) {}
public function store() {}
}
You can also choose what actions are included or excluded like this:
Route::resource('users', 'UsersCont...