大约有 45,000 项符合查询结果（耗时：0.0708秒） [XML]
How do servlets work? Instantiation, sessions, shared variables and multithreading
...afety
That said, your major concern is possibly thread safety. You should now know that servlets and filters are shared among all requests. That's the nice thing about Java, it's multithreaded and different threads (read: HTTP requests) can make use of the same instance. It would otherwise be too e...
What is the difference between the Data Mapper, Table Data Gateway (Gateway), Data Access Object (DA
...ulate the database logic for a specific entity so the calling code has no knowledge of the underlying persistence layer. From my brief research all of them typically implement your standard CRUD methods and abstract away the database-specific details.
...
How to pull request a wiki page on GitHub?
...i repo
push your changes to GitHub
Once you are ready to let the author know you have changes, do the following:
open an issue on OREPO
provide a direct link to your wiki's git repo for ease of merging:
i.e. [FREPO].wiki.git
Merging Changes
As the owner of OREPO, you have now received a messa...
java.sql.SQLException: - ORA-01000: maximum open cursors exceeded
...e theory behind cursors and how JDBC should be used. If you don't need to know the background, you can skip this and go straight to 'Eliminating Leaks'.
What is a cursor?
A cursor is a resource on the database that holds the state of a query, specifically the position where a reader is in a Result...
MySQL order by before group by
...publish', post_type='post', post_author='user A', post_date='2012-12-31')
Now, when you order the results of the grouping by post_date, you get the data you wanted.
SELECT wp_posts.*
FROM wp_posts
WHERE wp_posts.post_status='publish' AND wp_posts.post_type='post'
GROUP BY wp_posts.post_author DESC...
Dependency Inject (DI) “friendly” library
...eed a short-lived object, or to construct the dependency based on a value known only at run-time.
See this for more information.
Compose only at the Last Responsible Moment
Keep objects decoupled until the very end. Normally, you can wait and wire everything up in the application's entry point. T...
How to handle Handler messages when activity/fragment is paused
... /**
* Store the message if we have been paused, otherwise handle it now.
*
* @param msg Message to handle.
*/
@Override
public final synchronized void handleMessage(Message msg) {
if (activity == null) {
final Message msgCopy = new Message();
...
JavaScript unit test tools for TDD
...ll. At the time it still depended on jQuery. A rewrite in 2009 fixed that, now QUnit runs completely standalone.
QUnit's assertion methods follow the CommonJS Unit Testing specification, which was to some degree influenced by QUnit.
Project home: http://qunitjs.com/
Sinon
Another great tool is sino...
Why C# fails to compare two object types with each other but VB doesn't?
I have two objects in C# and don't know if it's Boolean or any other type.
However when I try to compare those C# fails to give the right answer.
I have tried the same code with VB.NET and that did it !
...
Skip List vs. Binary Search Tree
I recently came across the data structure known as a skip list . It seems to have very similar behavior to a binary search tree.
...