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“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...th many rows, I want to skip duplicate entries that would otherwise cause failure. After some research, my options appear to be the use of either:
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Need for predictable random generator
...ndomness in small runs of some games is undesirable -- it does seem too unfair for some use cases.
I wrote a simple Shuffle Bag like implementation in Ruby and did some testing. The implementation did this:
If it still seems fair or we haven't reached a threshold of minimum rolls, it returns a...
Java 反射最佳实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...优雅的使用反射。本文的例子都可以在示例代码中看到并下载，如果喜欢请star，如果觉得有纰漏请提交issue，如果你有更好的点子...概要：最简单优雅的使用反射。
本文的例子都可以在示例代码中看到并下载，如果喜欢请star，...
Difference between add(), replace(), and addToBackStack()
What is the main difference between calling these methods:
9 Answers
9
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How do I view all commits for a specific day?
...rking on a specific day and update my timesheet based on that, but it's a pain in the ass to type in the full date in ISO format so I just do it like this
git log --after=jun9 --before=jun10
and I add --author to only print my commits
git log --since=jun9 --until=jun10 --author=Robert
This pr...
Schema for a multilanguage database
... This option is similar to my option nr 1 but better. It is still hard to maintain and requires creating new tables for new languages, so I'd be reluctant to implement it.
– qbeuek
Nov 27 '08 at 10:22
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Uber5岁了，一次性告诉你它的商业之道 - 资讯 - 清泛网 - 专注C/C++及内核技术
...，与同学合伙创办了Sour网站，这是一个提供流媒体交换下载的服务平台，网友之间可以交换音乐和电影视频。
或许只是偶然，这个网站从一诞生就触犯了美国版权保护法。1999年，Sour被30多家音乐、影视出版巨头联合起诉，索...
ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...有一条物理串口线。这种方法还需要你有两台电脑（一台安装ros，另一台接受调试信息）。
需要一条名为“Null-Modem”的串口线，你可以在电脑公司以低于10美元的价格买到（这个东西。。。反正我是从来没听说过。。）当然，...
Eclipse RCP开发桌面程序 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...终于找到了，原来使用Eclipse进行OpenGL开发，还需要另外下载OpenGL插件，如下图：
这里有OpenGL的类库，还有一个示例，把类库下载下来，解压，放到Eclipse的Plugin目录下，然后在我们的项目中添加依赖项，就可以看到我们需要...
Solving “Who owns the Zebra” programmatically?
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Here's a solution in Python based on constraint-programming:
from constraint import AllDifferentConstraint, InSetConstraint, Problem
# variables
colors = "blue red green white yellow".split()
nationalities = "Norwegian German Dane Swede English".split()
pet...