大约有 23,000 项符合查询结果（耗时：0.0424秒） [XML]
Right query to get the current number of connections in a PostgreSQL DB
...rsion of the first one would be:
SELECT sum(numbackends) FROM pg_stat_database;
In that case, I would expect that version to be slightly faster than the second one, simply because it has fewer rows to count. But you are not likely going to be able to measure a difference.
Both queries are based ...
ViewParam vs @ManagedProperty(value = “#{param.id}”)
...init}" /> inside the <f:metadata> to do initialization/preloading based on the set values. Since JSF 2.2 you could use <f:viewAction> for that instead.
Allows for nested <f:converter> and <f:validator> for more fine-grained conversion/validation. Even a <h:message> ...
SimpleTest vs PHPunit
...sly).
PHPUnit is actively maintained, stable and works great for every codebase, every scenario and every way you want to write your tests.
(Subjective) PHPUnit provides much nicer code coverage reports than Simpletest
With PHPUnit you also get these reports inside your IDE (Netbeans, Eclipse, ...)
...
Difference between Git and GitHub
...centralised version control systems.
What is GitHub:
"GitHub is a web-based Git repository hosting service, which offers all of the distributed revision control and source code management (SCM) functionality of Git as well as adding its own features."
Github provides access control and severa...
Get all inherited classes of an abstract class [duplicate]
... you'd think.
You need to use Assembly.GetAssembly(typeof(T)) because your base class might be in a different assembly.
You need to use the criteria type.IsClass and !type.IsAbstract because it'll throw an exception if you try to instantiate an interface or abstract class.
I like forcing the enumer...
When to use f:viewAction / preRenderView versus PostConstruct?
... the @PostConstruct annotation? Is the rationale to use one or the other based on the type of scope of the backing bean e.g. If the backing bean is @RequestScoped , then would the choice of using f:viewAction or preRenderView over @PostConstruct to initialize your backing bean prior to rend...
What is a StoryBoard ID and how can i use this?
...board ID is a String field that you can use to create a new ViewController based on that storyboard ViewController. An example use would be from any ViewController:
//Maybe make a button that when clicked calls this method
- (IBAction)buttonPressed:(id)sender
{
MyCustomViewController *vc = [se...
What browsers support HTML5 WebSocket API?
...ywebsockets
websockify
gevent-websocket, gevent-socketio and flask-sockets based on the former
Autobahn
Tornado
In C:
libwebsockets
In Node.js:
Socket.io : Socket.io also has serverside ports for Python, Java, Google GO, Rack
sockjs : sockjs also has serverside ports for Python, Java, Erlang...
How do you get current active/default Environment profile programmatically in Spring?
I need to code different logic based on different current Environment profile. How can you get the current active and default profiles from Spring?
...
Random / noise functions for GLSL
...
Gold Noise
// Gold Noise ©2015 dcerisano@standard3d.com
// - based on the Golden Ratio
// - uniform normalized distribution
// - fastest static noise generator function (also runs at low precision)
float PHI = 1.61803398874989484820459; // Φ = Golden Ratio
float gold_noise(in ve...