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SSL Error When installing rubygems, Unable to pull data from 'https://rubygems.org/
...ing to do the Michael Hartl tutorial. When I attempt to install rails 3.2.14 in my gemset, I get the following issue:
24 A...
Print new output on same line [duplicate]
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187
From help(print):
Help on built-in function print in module builtins:
print(...)
print(v...
C++中智能指针的设计和使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...。每次创建类的新对象时，初始化指针并将引用计数置为1；当对象作为另一对象的副本而创建时，拷贝构造函数拷贝指针并增加与之相应的引用计数；对一个对象进行赋值时，赋值操作符减少左操作数所指对象的引用计数（如...
快速理解 高频对冲套利自动交易（程式化交易） - 更多技术 - 清泛网 - 专注...
...、程序化交易等等的误解与混乱，特开贴探讨。破题篇：1、何谓：高频？T+0制度下，反反复复做同样一件...有感于，目前中国期货界，对于量化投资、程序化交易等等的误解与混乱，特开贴探讨。
破题篇：
1、何谓：高频...
Initialising an array of fixed size in python [duplicate]
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11 Answers
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How to update the value stored in Dictionary in C#?
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edited Nov 28 '12 at 11:12
IT ppl
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Circular gradient in android
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edited Mar 26 at 15:04
Viktor Yakunin
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a...
Redis消息通知系统的实现 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...xtends Redis
{
const POSITION_FIRST = 0;
const POSITION_LAST = -1;
public function zPop($zset)
{
return $this->zsetPop($zset, self::POSITION_FIRST);
}
public function zRevPop($zset)
{
return $this->zsetPop($zset, self::POSITION_LAST);
}
...
Drop unused factor levels in a subsetted data frame
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14 Answers
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On Duplicate Key Update same as insert
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Alternatively, you can use:
INSERT INTO table (id,a,b,c,d,e,f,g)
VALUES (1,2,3,4,5,6,7,8)
ON DUPLICATE KEY
UPDATE a=a, b=b, c=c, d=d, e=e, f=f, g=g;
To get the id from LAST_INSERT_ID; you need to specify the backend app you're using for the same.
For LuaSQL, a conn:getlastautoid() fetches ...