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How to implement a unique index on two columns in rails
...t different syntax for specifying the columns.
– François Beausoleil
Nov 8 '10 at 13:30
14
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Virtualbox “port forward” from Guest to Host [closed]
...twork communication Host -> Guest
Connect to the Guest and find out the ip address:
ifconfig
example of result (ip address is 10.0.2.15):
eth0 Link encap:Ethernet HWaddr 08:00:27:AE:36:99
inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0
Go to Vbox instance window ->...
CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...网络(CDN)是一种新型的网络构建方式，它是为能在传统的IP网发布宽带丰富媒体而特别优化的网络覆盖层；而从广义的角度，CDN代表了一种基于质量与秩序的网络服务模式。简单地说，内容发布网络(CDN)是一个经策略性部署的整体...
How to get visitor's location (i.e. country) using geolocation? [duplicate]
...need to locate the user if you only need their country. You can look their IP address up in any IP-to-location service (like maxmind, ipregistry or ip2location). This will be accurate most of the time.
If you really need to get their location, you can get their lat/lng with that method, then query ...
PHP how to get local IP of system
I need to get local IP of computer like 192.*....
Is this possible with PHP?
16 Answers
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TCP: can two different sockets share a port?
...n is uniquely identified by the combination of client-side and server-side IP/Port pairs. Multiple connections on the same server can share the same server-side IP/Port pair as long as they are associated with different client-side IP/Port pairs, and the server would be able to handle as many clien...
Supabase扩展能实现实时推送吗？源码级Realtime能力分析 - App应用开发 - ...
...有使用 @UsesLibraries 注解引入任何外部网络库
5. 对整个 AI2 组件源码 grep WebSocket 关键字，结果为零——整个 AI2 生态没有 WebSocket 实现
结论：当前 Supabase 扩展完全不支持 Realtime 功能。
三、Supabase Realtime 的底层协议
Supabas...
Run/install/debug Android applications over Wi-Fi?
...9.
Connect the device via USB and make sure debugging is working;
adb tcpip 5555. This makes the device to start listening for connections on port 5555;
Look up the device IP address with adb shell netcfg or adb shell ifconfig with 6.0 and higher;
You can disconnect the USB now;
adb connect <DE...
App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
...ub
MIT App Inventor 官方文档采用 CC BY-SA 4.0 授权。本文档由 ai2claw 整理，仅供学习参考。
Usage of forceLayout(), requestLayout() and invalidate()
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To better understand answers provided by François BOURLIEUX and Dalvik I suggest you take a look at this awesome view lifecycle diagram by Arpit Mathur:
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