大约有 45,000 项符合查询结果（耗时：0.0665秒） [XML]
Equation for testing if a point is inside a circle
If you have a circle with center (center_x, center_y) and radius radius , how do you test if a given point with coordinates (x, y) is inside the circle?
...
Solutions for INSERT OR UPDATE on SQL Server
...ford & @Esteban show general idea but error-prone.
To avoid deadlocks and PK violations you can use something like this:
begin tran
if exists (select * from table with (updlock,serializable) where key = @key)
begin
update table set ...
where key = @key
end
else
begin
insert into tab...
What does do?
...
October 2015 Update
This answer was posted several years ago and now the question really should be should you even consider using the X-UA-Compatible tag on your site? with the changes Microsoft has made to its browsers (more on those below).
Depending upon what Microsoft browsers you...
Passing variables in remote ssh command
I want to be able to run a command from my machine using ssh and pass through the environment variable $BUILD_NUMBER
7 Ans...
private[this] vs private
...t very rich Java background I learnt to close everything (make it private) and open (provide accessors) if necessary. Scala introduces even more strict access modifier. Should I always use it by default? Or should I use it only in some specific cases where I need to explicitly restrict changing fiel...
How do I create a list of random numbers without duplicates?
I tried using random.randint(0, 100) , but some numbers were the same. Is there a method/module to create a list unique random numbers?
...
Google Tag Manager 入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...击在Versions -> Overview页面的右上角，Create Version，选择Save and Preview，这时会进入调试模式，在弹出的对话框里，点击：jiyang.me链接。
在默认的首页下方，会提示当前页面加载的tag脚本与名称。
确认没有问题后，我们回到最...
How to tell PowerShell to wait for each command to end before starting the next?
...cript to just open a bunch of applications. The first is a virtual machine and the others are development applications. I want the virtual machine to finish booting before the rest of the applications are opened.
...
Int to Char in C#
... Before doing so, it checks to ensure "value" is in the range 0 to 0xffff, and throws an OverflowException if it is not. The extra method call, value/boundary checks, and OverflowException may be useful, but if not, the performance will be better if you just use "(char)value".
...
How can I get the current date and time in the terminal and set a custom command in the terminal for
...
The command is date
To customise the output there are a myriad of options available, see date --help for a list.
For example, date '+%A %W %Y %X' gives Tuesday 34 2013 08:04:22 which is the name of the day of the week, the week num...