Calculate difference between two datetimes in MySQL

Calculate difference between two datetimes in MySQL

I am storing the last login time in MySQL in, datetime-type filed. When users logs in, I want to get the difference between the last login time and the current time (which I get using NOW()).How can I calculate it? 1:USE TIMESTAMPDIFF My

Where is my .vimrc file?

Where is my .vimrc file?

I have been using Vim, and I would really like to save my settings. The problem I am having is that I cannot find my .vimrc file, and it is not in the standard /home/user/.vimrc location. How might I find this file? 1:You need to create

Use of eval in Python?

Use of eval in Python?

There is an eval() function in Python I stumbled upon while playing around. I cannot think of a case when this function is needed, except maybe as syntactic sugar. Can anyone give an example? 1:eval and exec are handy quick-and-dirty way

Authorize attribute in ASP.NET MVC

Authorize attribute in ASP.NET MVC

I am having a hard time to understand real use of [Authorize] attribute in ASP.NET MVC. As per the concept goes, if we decorate a controller method with [Authorize] attribute, only authenticated users are allowed to access the controllers.

convert htaccess to nginx [closed]

convert htaccess to nginx [closed]

I'm having no luck converting htaccess rules to nginx rewrite. I've checked out the NginxRewriteModule documentation and have a few done, but the more complicate ones I'm at a loss for. Here's what I'm looking at:RewriteRule ^$

How can I Remove .DS_Store files from a Git repository?

How can I Remove .DS_Store files from a Git repository?

How can I remove those annoying Mac OS X .DS_Store files from a Git repository? 1:Remove existing files from the repository:find . -name .DS_Store -print0 | xargs -0 git rm -f --ignore-unmatchAdd the line.DS_Storeto the file .gitignore,

Accessing FXML controller class

Accessing FXML controller class

I would like to communicate with a FXML controller class at any time, to update information on the screen from the main application or other stages.Is this possible? I havent found any way to do it.Static functions could be a way, but the

Should I always return IEnumerable instead of IList?

Should I always return IEnumerable instead of IList?

When I'm writing my DAL or other code that returns a set of items, should I always make my return statement:public IEnumerable GetRecentItems()or public IList GetRecentItems()Currently, in my code I have been trying to use IEnumerable as mu

Firebase and indexing/search

Firebase and indexing/search

I am considering using Firebase for an application that should people to use full-text search over a collection of a few thousand objects. I like the idea of delivering a client-only application (not having to worry about hosting the data),

php check file extension in upload form

php check file extension in upload form

I check file extension for upload or not uploaded. my i.e methods worked but now i need to understand, my methods (pathinfo) is true ? another better and faster way ?! Thanks$filename = $_FILES['video_file']['name'];$ext = pathinfo($filena

No secret option provided to Rack::Session::Cookie warning?

No secret option provided to Rack::Session::Cookie warning?

I am running Rails 3.2.3, Ruby 1.9 under Fedora 17. I get this warning, when I run rails s, and how do I fix? SECURITY WARNING: No secret option provided to Rack::Session::Cookie. This poses a security threat. It is strongly recommend

How to check if Location Services are enabled?

How to check if Location Services are enabled?

I'm developing an app on Android OS. I don't know how to check if Location Services are enabled or not.I need a method that returns "true" if they are enabled and "false" if not (so in the last case I can show a dialog to enable them). 1

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al

I just discovered a logical bug in my code which was causing all sorts of problems. I was inadvertently doing a bitwise AND instead of a logical AND.I changed the code from:r = mlab.csv2rec(datafile, delimiter=',', names=COL_HEADERS)mask =

Auto detect mobile browser (via user-agent?) [closed]

Auto detect mobile browser (via user-agent?) [closed]

How can I detect if a user is viewing my web site from a mobile web browser so that I can then auto detect and display the appropriate version of my web site? 1:Yes, reading the User-Agent header will do the trick. There are some lists o