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What is the difference between JSF, Servlet and JSP?
...listen to a certain HTTP URL pattern, which is configurable in web.xml, or more recently with Java EE 6, with @WebServlet annotation.
When a Servlet is first requested or during web app startup, the servlet container will create an instance of it and keep it in memory during the web app's lifetime. ...
How to get value from form field in django framework?
...d on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Difference between Bridge pattern and Adapter pattern
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downvoted, could you use a more abstract code listing? the example is too specific and is confusing.
– user9903
Mar 16 '10 at 22:52
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When is std::weak_ptr useful?
...tr when the object pointed is deleted/not pointed by any other pointers anymore?
– user1434698
Aug 19 '12 at 23:16
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Why does using an Underscore character in a LIKE filter give me all the results?
...', 'abcc', 'xabcd' and so on.
The '%' character is used for matching 0 or more number of characters. That means, if you search by columnName LIKE '%abc', it will give you result with having 'abc', 'aabc', 'xyzabc' and so on, but no 'xyzabcd', 'xabcdd' and any other string that does not end with 'ab...
Can't escape the backslash with regex?
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This can become even more convoluted when searching for backslashes along with patterns that require meta characters. Take for example, finding a backslash followed by a digit. Now you'd be staring at the following expression trying to figure out...
jQuery vs document.querySelectorAll
...is not supported in older browsersThis probably won't cause any trouble anymore nowadays. It has a very unintuitive scoping mechanism and some other not so nice features. Also with javascript you have a harder time working with the result sets of these queries, which in many cases you might want to ...
What does Redis do when it runs out of memory?
...gure Redis with a maxmemory parameter, which prevents Redis from using any more memory (the default).
Newer versions of Redis have various policies when maxmemory is reached:
volatile-lru remove a key among the
ones with an expire set, trying to
remove keys not recently used.
volatile-ttl remove ...
multiple definition of template specialization when using different objects
... fully specialize something, it doesn't depend on a template parameter any more -- so unless you make the specialization inline, you need to put it in a .cpp file instead of a .h or you end up violating the one definition rule as David says. Note that when you partially specialize templates, the par...