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How to design a database for User Defined Fields?
...r to json. It features a typesave interface to read and write data without casting and with great programming language integration. That's really great. It has the same problem as all of this kind of "documents" in databases. It's hard to query for spcific values and it cannot easily reference data ...
Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
这几天系统地学习了一下Lua这个脚本语言，Lua脚本是一个很轻量级的脚本，也是号称性能最高的脚本，用在很多需要性能的地方，比如：游戏脚本，nginx，wireshark的脚本，当你把他的源码下下来编译后，你会发现解释器居然不到2...
When should I use C++14 automatic return type deduction?
...n expressions they are usually implicit but we can make them explicit with casts". C++11 and C++1y introduce type deduction tools so that you can leave out the type in new places.
Sorry, but you're not going to solve this up front by making general rules. You need to look at particular code, and de...
When to use symbols instead of strings in Ruby?
...Printing the symbols will be slower than printing strings because they are cast to strings.
Having lots of different symbols will increase the overall memory usage of your application since they are never deallocated. And you are never using all strings from your code at the same time.
Use case b...
How to retrieve form values from HTTPPOST, dictionary or?
...e" (name is as you like but keep it consistent) and try to build it up and cast it to MyModel.
[HttpPost]
public ActionResult PostBack(HomeModel variableName){
postBack.HouseNumber; //The value user entered
postBack.StreetAddress; //the default value of NULL.
}
When a controller is expec...
BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
广播和扫描在无线通信中是非常重要的一个技术点。在BLE中，扫描和广播是通信的基础，用户可以直接用扫描和广播进行数据的传输（数据量不大，功耗要求较高的情况下），也可以在广播和扫描的基础上进行连接后点对点通信...
CentOS+Nginx+PHP+MySQL详细配置(图解) - PHP - 清泛IT论坛，有思想、有深度
本帖最后由 zqp2013 于 2015-4-26 14:29 编辑
一、安装MySQL
目前web服务器已经很少有跑静态页面的，如果要跑动态网站那当然就离不开数据库，虽然在以前文章中有写MySQL是怎么安装的，但是感觉好久没...
What is the significance of 1/1/1753 in SQL Server?
...ith the greater range of datetime2
SELECT CONVERT(VARCHAR, DATEADD(DAY,-5,CAST('1752-09-13' AS DATETIME2)),100)
Returns
Sep 8 1752 12:00AM
One final point with the datetime2 data type is that it uses the proleptic Gregorian calendar projected backwards to well before it was actually invented ...
Can I use view pager with views (not with fragments)
...
you dont need to cast to ViewPager at all as you are dealing with the ViewGroup interface
– Dori
Sep 1 '15 at 17:02
...
关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
本帖最后由 天空一直巨响 于 2015-09-20 11:35 编辑
做了好几年的flash的aser，技术一直停留在flash这个狭小的容器内，最近转向php，才慢慢体会到之前充实技术开发前的那段极度渴望去学习新知识的那种动力，可能在大多数的人眼...