大约有 40,700 项符合查询结果（耗时：0.0421秒） [XML]
Which is faster/best? SELECT * or SELECT column1, colum2, column3, etc
I've heard that SELECT * is generally bad practice to use when writing SQL commands because it is more efficient to SELECT columns you specifically need.
...
Calling a Java method with no name
...
This:
static {
System.out.print("x ");
}
is a static initialization block, and is called when the class is loaded. You can have as many of them in your class as you want, and they will be executed in order of the...
What is a higher kinded type in Scala?
...
Let me make up for starting some of this confusion by pitching in with some disambiguation. I like to use the analogy to the value level to explain this, as people tend to be more familiar with it.
A type constructor is a type that you can apply to type argumen...
Why would adding a method add an ambiguous call, if it wouldn't be involved in the ambiguity
I have this class
5 Answers
5
...
Is there a use-case for singletons with database access in PHP?
...ns to choose not to use static classes, but they are pretty big ones.
One is that you will find that very often something that you are absolutely sure that you'll never have more than one instance of, you eventually have a second. You may end up with a second monitor, a second database, a second s...
how to use javascript Object.defineProperty
... longer, but it may save you much more time than I have spent on writing this:
Property is an OOP feature designed for clean separation of client code. For example, in some e-shop you might have objects like this:
function Product(name,price) {
this.name = name;
this.price = price;
this.disc...
Regex Match all characters between two strings
Example:
"This is just\na simple sentence".
14 Answers
14
...
GetHashCode Guidelines in C#
...
The answer is mostly, it is a valid guideline, but perhaps not a valid rule. It also doesn't tell the whole story.
The point being made is that for mutable types, you cannot base the hash code on the mutable data because two equal obje...
Best practice to call ConfigureAwait for all server-side code
...our functions are asynchronous - so they return Task<SomeObject> - is it considered best practice that any time you await functions that you call ConfigureAwait(false) ?
...
How to use onSavedInstanceState example please
...comes down to saving a state. So I know that onSaveInstanceState(Bundle) is called when the activity is about to be destroyed. But how do you store your information in it and bring it back to its original state in onCreate(Bundle savedInstanceState) ? I don't understand how this bundle will resto...