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Error renaming a column in MySQL
...ting the error of the answer so you have to Drop foreign key, alter table, and add foreign key (it's better to backup first) and u can alter it by only changing the name in right click on the table - alter table
– Chris Sim
May 9 '14 at 10:06
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Java Enum Methods - return opposite direction enum
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how do you use it, though? and what is this technique called?
– Thufir
Jul 7 '14 at 6:46
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What is a segmentation fault?
What is a segmentation fault? Is it different in C and C++? How are segmentation faults and dangling pointers related?
14 A...
Javascript: Round up to the next multiple of 5
... only rounds up decimals to whole integers.
– Amit Erandole
Sep 23 '13 at 7:07
2
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How to create the most compact mapping n → isprime(n) up to a limit N?
...test, you should probably run a probabilistic test since those are faster, and then follow it up with a deterministic test to make sure the number is prime.
You should know that the math behind the fastest algorithms is not for the faint of heart.
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User Authentication in ASP.NET Web API
...henticated(string role)
{
string[] parts = UTF8Encoding.UTF8.GetString(Convert.FromBase64String(Request.Headers.Authorization.Parameter)).Split(':');
if (parts.Length != 2 || !Membership.ValidateUser(parts[0], parts[1]))
throw new HttpResponseException(Request.CreateErrorResponse(Htt...
Using IQueryable with Linq
...ing data from a table in two ways, one which returns IEnumerable<T>, and one which returns an IQueryable<T>. Say, for example, you have a Products table, and you want to get all of the products whose cost is >$25.
If you do:
IEnumerable<Product> products = myORM.GetProducts(...
Java Map equivalent in C#
...)
{
otherExample["key"] = value + 1;
}
With this method you can fast and exception-less get values (if present).
Resources:
Dictionary-Keys
Try Get Value
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How do I create a custom iOS view class and instantiate multiple copies of it (in IB)?
...Nib];
nibView.frame = self.bounds;
// the autoresizingMask will be converted to constraints, the frame will match the parent view frame
nibView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
// Adding nibView on the top of our view
[self ad...
What are metaclasses in Python?
In Python, what are metaclasses and what do we use them for?
22 Answers
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