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Can a foreign key be NULL and/or duplicate?
...do is allow nulls on the field that has the FK. The null value is separate from the idea of it being an FK.
Whether it is unique or not unique relates to whether the table has a one-one or a one-many relationship to the parent table. Now if you have a one-one relationship, it is possible that you...
Conditionally ignoring tests in JUnit 4
...auses the test to be ignored.
Edit: To compare with the @RunIf annotation from junit-ext, their sample code would look like this:
@Test
public void calculateTotalSalary() {
assumeThat(Database.connect(), is(notNull()));
//test code below.
}
Not to mention that it is much easier to captur...
Temporarily put away uncommitted changes in Subversion (a la “git-stash”)
...
When I've got uncommitted changes from one task in my working copy and I need to switch to another task, I do one of two things:
Check out a new working copy for the second task.
or
Start a branch:
workingcopy$ svn copy CURRENT_URL_OF_WORKING_COPY SOME_BR...
jQuery get textarea text
... the only clean solution that doesn't involve either parsing out the input from the output ( foolish to try -- what if the user types over some "output" ), or trying to build up a string from keystroke events ( foolish to try -- what about backspaces, etc? ).
– Nick Perkins
...
Is there any use for unique_ptr with array?
...ically sized array, so std::array is out. And some people get their arrays from other code that is known to return an array; and that code isn't going to be rewritten to return a vector or something.
By allowing unique_ptr<T[]>, you service those needs.
In short, you use unique_ptr<T[]>...
xUnit.net: Global setup + teardown?
...lity is only called once. For this version, you don't extends a base class from your test class but implement the IClassFixture<T> interface where T refers to your fixture class:
using Xunit;
public class TestsFixture : IDisposable
{
public TestsFixture ()
{
// Do "global" in...
How to add and get Header values in WebApi
I need to create a POST method in WebApi so I can send data from application to WebApi method. I'm not able to get header value.
...
Change all files and folders permissions of a directory to 644/755
How would I change all files to 644 and all folders to 755 using chmod from the linux command prompt? (Terminal)
8 Answ...
SVN 405 Method Not Allowed
...an issue with this and my solution ended up removing the folder completely from my local copy as well as the server copy. I can do updates and commits without problems on any other file or folder, but if I try to create a folder with the same name, add, and commit, it gives me the following error:
...
What is the difference between the OAuth Authorization Code and Implicit workflows? When to use each
...o provide client secret this time to token url to get token as json object from authorization server. It is used in case you have application server that can handle this and store user token with his/her profile on his own system, and mostly used for common mobile applications.
so it is depends on...