大约有 30,000 项符合查询结果（耗时：0.0170秒） [XML]
Select where count of one field is greater than one
...
I give an example up on Group By between two table in Sql:
Select cn.name,ct.name,count(ct.id) totalcity
from city ct left join country cn on ct.countryid = cn.id
Group By cn.name,ct.name
Having totalcity > 2
s...
SqlDataAdapter vs SqlDataReader
... minimum amount of code you should have when using a SqlDataReader:
Using cn As New SqlConnection("..."), _
cmd As New SqlCommand("...", cn)
cn.Open()
Using rdr As SqlDataReader = cmd.ExecuteReader()
While rdr.Read()
''# ...
End While
End Using
End Usi...
What is context in _.each(list, iterator, [context])?
... // someOtherArray.
}, someOtherArray);
Working Example: http://jsfiddle.net/a6Rx4/
It uses the number from each member of the Array being iterated to get the item at that index of someOtherArray, which is represented by this since we passed it as the context parameter.
If you do...
一致性hash和solr千万级数据分布式搜索引擎中的应用 - 大数据 & AI - 清泛...
...ched。下面简单介绍下一致性hash的基本原理。最早的版本 http://dl.acm.org/citation.cfm?id=258660。国内网上有很多文章都写的比较好。如： http://blog.csdn.net/x15594/article/details/6270242
准备：1、2、3 三台机器
还有待分配的9个数 1、2、3、4...
Detect Browser Language in PHP
...y dont you keep it simple and clean
<?php
$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
$acceptLang = ['fr', 'it', 'en'];
$lang = in_array($lang, $acceptLang) ? $lang : 'en';
require_once "index_{$lang}.php";
?>
...
Xcode doesn't show the line that causes a crash
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
为AppInventor2开发拓展(Extension) · App Inventor 2 中文网
...下载好的工程源码，关注页面底部公众号（或搜索“fun123cn”关注），回复“源码”即可免费下载。
代码编写
采用自己较为熟悉的java开发环境就行，这里推荐使用VSCode，拓展目录在 appinventor-sources/appinventor/components ，测试代码...
How to create a GUID/UUID in Python
... See the module docs and the RFC for details. [source]
Docs:
Python 2: http://docs.python.org/2/library/uuid.html
Python 3:
https://docs.python.org/3/library/uuid.html
Example (working on 2 and 3):
>>> import uuid
>>> uuid.uuid4()
UUID('bd65600d-8669-4903-8a14-af88203add38')...
Uncatchable ChuckNorrisException
... to throw it. It's easy to create an exception that you can't throw: class cn extends exception{private cn(){}}
– John Dvorak
Dec 18 '12 at 20:55
...
Is it possible to start a shell session in a running container (without ssh)
...fficult to get running.
https://gist.github.com/ubergarm/ed42ebbea293350c30a6
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