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MongoDB仿关系型数据库Group聚合例子 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...系型数据库例子，通过BsonJavaScript脚本实现。相当的SQL：select * from GroupDemo a right join (select userName,max(date) maxdate from GroupDemo group by userName) b on a date=b maxdate
namespace MongoGroupDemo
{
class Program
{
private static string MongoConnStr...
Linq 多字段排序，二次排序 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ed = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );类似SQL：select * from t1 order by f1 d...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，OrderByD...
jQuery Validate Plugin - How to create a simple custom rule?
...ame="' + element.name + '"]:checked').length > 0;
}, "Atleast 1 must be selected");
And you can also override the message of a rule (ie: Atleast 1 must be selected) by using the syntax data-msg-rulename="my new message".
NOTE
If you use the data-rule-rulename method then you will need to mak...
Supabase 拓展：App 接入 Supabase 后端服务（Auth + PostgreSQL + Storage...
...here: WHERE 条件（如 name=eq.张三&age=gte.18）
Query(table,where,select,orderBy,limit,offset)
完整查询。table: 表名, where: WHERE 条件, select: 选择字段, orderBy: 排序（如 created_at.desc）, limit: 限制数量, offset: 偏移量
Insert(table,data)
插入记录。t...
What are the Android SDK build-tools, platform-tools and tools? And which version should be used?
... Behavior > System Settings > Android SDK
Choose the SDK Tools tab.
Select Android SDK Build Tools from the list
Check Show Package Details.
The last item will show the most recent version.
Make sure it is installed and then write that number as the buildToolsVersion in build.gradle (M...
Bash variable scope
...do
var="abc"
echo $var | xsel -i -p # redirect stdin to the X primary selection
done
var=$(xsel -o -p) # redirect back to stdout
echo $var
EDIT:
Here, xsel is a requirement (install it).
Alternatively, you can use xclip:
xclip -i -selection clipboard
instead of
xsel -i -p
...
How to reset or change the MySQL root password?
...qld]
skip-grant-tables
sudo service mysql restart
mysql -u root
use mysql
select * from mysql.user where user = 'root'; - Look at the top to determine whether the password column is called
password or authentication_string
UPDATE mysql.user set *password_field from above* = PASSWORD('your_new_passw...
Linq list of lists to single list
...
You want to use the SelectMany extension method.
var residences = details.SelectMany(d => d.AppForm_Residences).ToList();
share
|
improve ...
JavaScript hashmap equivalent
...nctional solution is simple and fast.
The key function can be as simple as selecting right attributes of the object, e.g., a key, or a set of keys, which are already unique, a combination of keys, which are unique together, or as complex as using some cryptographic hashes like in DojoX encoding, or ...
Tar a directory, but don't store full absolute paths in the archive
...
how about if you also want to select the files to backup based on a wildcard? -C /var/www/site1 *.dat doesn't work :(
– Andy Lorenz
Nov 5 '14 at 10:30
...