大约有 32,294 项符合查询结果（耗时：0.0498秒） [XML]
Select random row from a sqlite table
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What about:
SELECT COUNT(*) AS n FROM foo;
then choose a random number m in [0, n) and
SELECT * FROM foo LIMIT 1 OFFSET m;
You can even save the first number (n) somewhere and only update it when the database count chan...
Difference between open and codecs.open in Python
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what I don't really get is why open sometimes can handle very well the UTF-8 encoded non-latin characters of the unicode set, and sometimes it fails miserabily ...
– cedbeu
Mar 27 '13 at...
Java 256-bit AES Password-Based Encryption
...ode.
It's provides a simple abstraction for encryption and seems to match what's required here,
The "standard" encryption method is 256-bit AES using PKCS #5's PBKDF2 (Password-Based Key Derivation Function #2). This method requires Java 6. The password used to generate the SecretKey should be kep...
CA2202, how to solve this case
...using statement for these objects. And pain yourself a bit when reasoning what will happen if the code throws an exception. Or shut-up the warning with an attribute. Or just ignore the warning since it is silly.
share
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How can I efficiently select a Standard Library container in C++11?
... add/remove things from the front as well as the back, std::deque might be what you need.
It should be noted that, thanks to move semantics, std::vector insertion performance may not be as bad as it used to be. Some implementations implemented a form of move semantic-based item copying (the so-call...
How to refresh Android listview?
...s to expose more info or options within each view of the listView. That's what I needed to do, so gave an up-vote. If the underlying data changes, it's probably a better idea to use notifyDataSetChanged().
– SBerg413
Jun 6 '13 at 14:05
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Rails: How to get the model class name based on the controller class name?
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If your controller and model are in the same namespace, then what you want is
controller_path.classify
controller_path gives you the namespace; controller_name doesn't.
For example, if your controller is
Admin::RolesController
then:
controller_path.classify # "Admin::Role" # CO...
UIPopovercontroller dealloc reached while popover is still visible
...just alloc init it wherever I need, show it and then [used to] release. In what is popovercontroller different?
– Mikayil Abdullayev
Jan 17 '12 at 14:32
17
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How can I get the intersection, union, and subset of arrays in Ruby?
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What if you have x = [1,1,2,4] y = [1,2,2,2] z = [4] How can you get it to give you any intersections between with sets instead of the intersection of all sets? So instead of it giving you [], it gives you [1,2,4]?
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Seedable JavaScript random number generator
...uild helper functions around it (eg. randRange(start, end)).
I'm not sure what RNG you're using, but it's best to know and document it so you're aware of its characteristics and limitations.
Like Starkii said, Mersenne Twister is a good PRNG, but it isn't easy to implement. If you want to do it yo...