大约有 40,000 项符合查询结果（耗时：0.0548秒） [XML]
What is the most efficient/elegant way to parse a flat table into a tree?
...
Now that MySQL 8.0 supports recursive queries, we can say that all popular SQL databases support recursive queries in standard syntax.
WITH RECURSIVE MyTree AS (
SELECT * FROM MyTable WHERE ParentId IS NULL
UNION ALL
SELECT m.* FROM MyTABLE AS m JOIN MyTree AS t ON m.ParentI...
How to reuse an ostringstream?
...rst use, you'll need to add something to the buffer first w/ MSVC.
struct Foo {
std::ostringstream d_str;
Foo() {
d_str << std::ends; // Add this
}
void StrFunc(const char *);
template<class T>
inline void StrIt(const T &value) {
d_str.clea...
How does __proto__ differ from constructor.prototype?
...
I've been trying to wrap my head around this recently and finally came up with this "map" that I think sheds full light over the matter
http://i.stack.imgur.com/KFzI3.png
I know I'm not the first one making this up but it was more interesting figuring it out that finding it :-). An...
Get all object attributes in Python? [duplicate]
Is there a way to get all attributes/methods/fields/etc. of an object in Python?
4 Answers
...
How to get only the last part of a path in Python?
...
I initially thought rstrip('/') would be simpler but then quickly realised I'd have to use rstrip(os.path.sep), so obviously the use of normpath is justified.
– Erik Kaplun
Jun 29 '14 at 13:44
...
Solving “Who owns the Zebra” programmatically?
...ution in Python based on constraint-programming:
from constraint import AllDifferentConstraint, InSetConstraint, Problem
# variables
colors = "blue red green white yellow".split()
nationalities = "Norwegian German Dane Swede English".split()
pets = "birds dog cats horse zebra".sp...
Chrome Dev Tools - Modify javascript and reload
...olution. Any code you add is not available in the console. E.g. adding var foo = 'bar' in a script does not expose foo to the console.
– AgmLauncher
Jun 27 '16 at 15:18
...
Shell one liner to prepend to a file
...t it sorta worked but weird things could happen, or it just didn't work at all, so it was furiously downvoted for a time. Such fun.
The solution exploits the exact implementation of file descriptors on your system and, because implementation varies significantly between nixes, it's success is enti...
Android: How to enable/disable option menu item on button click?
...
Anyway, the documentation covers all the things.
Changing menu items at runtime
Once the activity is created, the
onCreateOptionsMenu() method is called
only once, as described above. The
system keeps and re-uses the Menu you
define in this meth...
How do you append to a file in Python?
...n C++. If you forget close(), it might take a while before the file is actually closed. It is easier that you might think to forget it when the code has multiple exit points, exceptions and so on.
– Petter
Jun 13 '13 at 17:37
...