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Fastest way to determine if an integer's square root is an integer
...st way to determine if a long value is a perfect square (i.e. its square root is another integer):
35 Answers
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浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术
...变为1 1000 0000 这样才能转化为
-128输出，不然1000 0000 如何输出？这当然是我的一种推断，具体怎么实现还得问CPU的设计者了。。。。
再看一个例子：
char a=-129;
printf("%d",a) ; 会输入多少？？ 结果为127 ，为...
How to avoid “Permission denied” when using pip with virtualenv
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Solution:
If you created the virtualenv as root, run the following command:
sudo chown -R your_username:your_username path/to/virtuaelenv/
This will probably fix your problem.
Cheers
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What scalability problems have you encountered using a NoSQL data store? [closed]
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I've switched a small subproject from MySQL to CouchDB, to be able to handle the load. The result was amazing.
About 2 years ago, we've released a self written software on http://www.ubuntuusers.de/ (which is probably the biggest German Linux community website)....
Delete with Join in MySQL
...ect_id = posts.project_id AND projects.client_id = :client_id;
BTW, with mysql using joins is almost always a way faster than subqueries...
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How to change MySQL column definition?
I have a mySQL table called test:
3 Answers
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MFC CListCtrl使用方法详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
... Programmatically
http://support.microsoft.com/kb/131284/en-us
19. 如何在CListView中使用CListCtrl的派生类
http://www.codeguru.com/cpp/controls/listview/introduction/article.php/c919/
20. listctrl的subitem添加图标
m_list.SetExtendedStyle(LVS_EX_SUBITEMIMAGES);
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Creation timestamp and last update timestamp with Hibernate and MySQL
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I would do this using a MySQL trigger so that even if the full entity is not saved or is modified by any external application or manual query, it'll still update these fields.
– Webnet
Jul 25 '13 at 12:09
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mysql create user if not exists
I have a query to check mysql users list for create new user.
2 Answers
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Why is it bad style to `rescue Exception => e` in Ruby?
... You can also ADAPTER_ERRORS = [::ActiveRecord::StatementInvalid, PGError, Mysql::Error, Mysql2::Error, ::ActiveRecord::JDBCError, SQLite3::Exception] and then rescue *ADAPTER_ERRORS => e
– j_mcnally
Feb 27 '14 at 2:19
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