大约有 45,000 项符合查询结果（耗时：0.0589秒） [XML]
mongodb count num of distinct values per field/key
...
MongoDB has a distinct command which returns an array of distinct values for a field; you can check the length of the array for a count.
There is a shell db.collection.distinct() helper as well:
> db.countries.distinct('country');
[ "Spain", "Engl...
Best practices for copying files with Maven
I have config files and various documents that I want to copy from the dev environment to the dev-server directory using Maven2. Strangely, Maven does not seem strong at this task.
...
Assign width to half available screen width declaratively
...s it possible to assign a widget width to half the available screen width, and do it using declarative xml?
5 Answers
...
SVG gradient using CSS
...
So I created that gradient in a separate file, and used fill this way: fill: url(../js/gradient.svg#MyGradient);. Is this the right way?
– Hrishikesh Choudhari
Dec 27 '12 at 10:00
...
Best way of invoking getter by reflection
...will always have a getter method. I know that I can use setAccesible(true) and get its value (when there is no PermissionManager), though I prefer to invoke its getter method.
...
Android Fragment lifecycle over orientation changes
...created automatically
}
Be warned though: problems will occur if you try and access Activity Views from inside the Fragment as the lifecycles will subtly change. (Getting Views from a parent Activity from a Fragment isn't easy).
...
Convert JSON String to JSON Object c#
... answered Apr 4 '14 at 18:42
AndreiAndrei
52.1k99 gold badges8080 silver badges101101 bronze badges
...
How do you use bcrypt for hashing passwords in PHP?
...pt works internally. And there are a TON of answers about that. Here are a selection that I've written, that I won't copy/paste here, but link to:
Fundamental Difference Between Hashing And Encryption Algorithms - Explaining the terminology and some basic information about them.
About reversing ha...
How to disable an Android button?
I have created a layout that contains two buttons, Next and Previous. In between the buttons I'm generating some dynamic views. So when I first launch the application I want to disable the "Previous" button since there wont be any previous views. I also want to disable the "Next" button when there a...
How do I initialize a TypeScript object with a JSON object
...hots at this to show a few different ways. They are by no means "complete" and as a disclaimer, I don't think it's a good idea to do it like this. Also the code isn't too clean since I just typed it together rather quickly.
Also as a note: Of course deserializable classes need to have default const...