大约有 10,900 项符合查询结果（耗时：0.0361秒） [XML]
How to check if a table exists in a given schema
...tion schema (information_schema.tables) is incorrect, strictly speaking, because (per documentation):
Only those tables and views are shown that the current user has access
to (by way of being the owner or having some privilege).
The query provided by @kong can return FALSE, but the table ca...
What is the difference between mocking and spying when using Mockito?
What would be a use case for a use of a Mockito spy?
5 Answers
5
...
What is the ultimate postal code and zip regex?
...mon pattern. In some countries they are made up by numbers, in others they can be combinations of numbers an letters, some can contain spaces, others dots, the number of characters can vary from two to at least six...
What you could do (theoretically) is create a seperate regex for every country in...
Using the field of an object as a generic Dictionary key
...ht "return FooID;" as the GetHashCode() if you want that as the match. You can also implement IEquatable<Foo>, but that is optional:
class Foo : IEquatable<Foo> {
public string Name { get; set;}
public int FooID {get; set;}
public override int GetHashCode() {
return...
combinations between two lists?
...having trouble wrapping my head around a algorithm I’m try to make. Basically, I have two lists and want to get all the combinations of the two lists.
...
Why are Perl 5's function prototypes bad?
...end to expect prototypes to provide a mechanism for checking that function calls are correct: that is, that they have the right number and type of arguments. Perl's prototypes are not well-suited for this task. It's the misuse that's bad. Perl's prototypes have a singular and very different purpose:...
Return type of '?:' (ternary conditional operator)
... they have a type and - as it's known in the latest C++ standard - a value category.
A conditional expression can be an lvalue or an rvalue. This is its value category. (This is somewhat of a simplification, in C++11 we have lvalues, xvalues and prvalues.)
In very broad and simple terms, an lvalue r...
Understanding Fragment's setRetainInstance(boolean)
... Fragment's state will be retained across the configuration change. Specifically, "retained" means that the fragment will not be destroyed on configuration changes. That is, the Fragment will be retained even if the configuration change causes the underlying Activity to be destroyed.
Will the fr...
In JavaScript, does it make a difference if I call a function with parentheses?
I noticed a difference when calling a function with empty parentheses, or without any parentheses at all. However, I am not passing any arguments to the function so I wondered, what would be the difference between:
...
Re-raise exception with a different type and message, preserving existing information
... and want to have a unified exception hierarchy for the exceptions that it can raise (e.g. inheriting from a FooError abstract class for all the foo module's specific exceptions). This allows users of the module to catch those particular exceptions and handle them distinctly, if needed. But many...