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mysql实现split分割字符串（length, SUBSTRING_INDEX, substring） - 爬虫/...
...符串，从pos起直到结束
以下通过一个例子查看效果：
SELECT SUBSTRING_INDEX(contentid, '-', 1) first, substring(contentid, 2+length(SUBSTRING_INDEX(contentid, '-', 1))) second, contentid FROM `table_xxx`复制代码
Linq 多字段排序，二次排序 - .NET(C#) - 清泛IT论坛，有思想、有深度
Linq：ordered = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );
类似SQL：select * from t1 order by f1 desc ,f2 asc
这种写法里 OrderBy、ThenBy 是升序的，OrderByDescending、ThenByDescending 是降序的。
Discuz轻松生成sitemaps.xml网站地图 - 更多技术 - 清泛网 - 专注C/C++及内核技术
....sitemaps.org/schemas/sitemap/0.9/sitemap.xsd\">\n";
$querys = DB::query("SELECT a.tid FROM ".DB::table('forum_thread')." a inner join ".DB::table('forum_forum')." b on a.fid=b.fid ORDER BY a.tid DESC LIMIT 0,10000");
while($threadfid = DB::fetch($querys))
{
$turl=$web_root.'thread-'.$threadfid[...
Iterate two Lists or Arrays with one ForEach statement in C#
...Zip method msdn.microsoft.com/en-us/library/dd267698.aspx and return resultSelector(first, second) instead of a KVP.
– Martín Coll
Jun 12 '13 at 19:17
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“Auto Layout still required after executing -layoutSubviews” with UITableViewCell subclass
...Hope)
+ (void)load
{
Method existing = class_getInstanceMethod(self, @selector(layoutSubviews));
Method new = class_getInstanceMethod(self, @selector(_autolayout_replacementLayoutSubviews));
method_exchangeImplementations(existing, new);
}
- (void)_autolayout_replacementLayoutSubviews...
UITextField text change event
...ntrol.
In Objective-C:
[textField addTarget:self
action:@selector(textFieldDidChange:)
forControlEvents:UIControlEventEditingChanged];
In Swift:
textField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
Then in the textFieldDidChange method...
Open firewall port on CentOS 7
...
When making changes to the firewall settings in Permanent mode, your
selection will only take effect when you reload the firewall or the
system restarts.
You can reload the firewall settings with: firewall-cmd --reload.
...
Transposing a 2D-array in JavaScript
...
Why would this option be better than the selected answer?
– Alex Lenail
Jul 31 '18 at 15:46
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How to get current user, and how to use User class in MVC5?
...{
uid = context.Users.Where(x => x.UserName == userName).Select(x=>x.Id).FirstOrDefault();
return uid;
}
return uid;
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How to recursively delete an entire directory with PowerShell 2.0?
... it useful to see what I'm about to delete by running
Get-Tree some_dir | select fullname
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