大约有 6,887 项符合查询结果（耗时：0.0212秒） [XML]
Use '=' or LIKE to compare strings in SQL?
...s used for equality test (as defined by the COLLATION in use).
= can use indexes while LIKE queries usually require testing every single record in the result set to filter it out (unless you are using full text search) so = has better performance.
...
Cannot issue data manipulation statements with executeQuery()
...) returns a ResultSet. I'm not as familiar with Java/MySQL, but to create indexes you probably want a executeUpdate().
share
|
improve this answer
|
follow
|
...
Count number of objects in list [closed]
...list <- vector(mode="list")
Let's put some stuff in it - 3 components/indexes/tags (whatever you want to call it) each with differing amounts of elements:
> mylist <- list(record1=c(1:10),record2=c(1:5),record3=c(1:2))
If you are interested in just the number of components in a list us...
【phpcms v9】PC站和手机站 全静态手机移动站方法 - 更多技术 - 清泛网 - ...
...t type=”text/javascript”>uaredirect(“http://m.aiguoxin.net/{$catdir}/index.html”);</script>
{else}
<script type=”text/javascript”>uaredirect(“http://m.aiguoxin.net/{$catdir}_{$page}.html”);</script>
{/if}
其它页面参照此法。如果不想做手机访问PC站自动跳转到...
javax.faces.application.ViewExpiredException: View could not be restored
...and session is destroyed. What should I do to redirect user to for example index.xhtml or login.xhtml and save him from seeing that error page/message?
...
Is std::vector so much slower than plain arrays?
...Vector completed in 5.567 seconds
Idea #4 - Use iterator instead of loop index
How about using a vector<Pixel>::iterator instead of a loop index?
for (std::vector<Pixel>::iterator j = pixels.begin(); j != pixels.end(); ++j)
{
j->r = 255;
j->g = 0;
j->b = 0;
}
R...
Run Java Code Online [closed]
...
http://ideone.com/ideone/Index/submit/
you can run your java code
share
|
improve this answer
|
follow
|
...
Ruby : How to write a gem? [closed]
...pdate the ChangeLog.rdoc file, run rake spec and rake rerdoc, open up html/index.html and double-check for any typos.
rake release
(Optional) submit a link and explanation of your new awesome gem to http://rubyflow.com
Sit back and bask in the glory of your first Gem. :)
...
Any good boolean expression simplifiers out there? [closed]
... For a quick online tool this is really helpful: tma.main.jp/logic/index_en.html
– Lenar Hoyt
Apr 6 '17 at 0:33
add a comment
|
...
jQuery parent of a parent
...ncestors that match the selector
and the :eq(1) says find the oneth (zero-indexed, so the second) element in the list
share
|
improve this answer
|
follow
|
...