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What does rake db:test:prepare actually do?
...he rails tutorial videos and I can't figure out what the db:test:prepare command actually does. Can someone provide an explanation?
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How to make Java honor the DNS Caching Timeout?
...cache.negative.ttl = 0
But pay attention to the security warnings in the comments surrounding those properties. Only do this if you are reasonably confident that you are not susceptible to DNS spoofing attacks.
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How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
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(Updated - Thanks to the people who commented)
Modern Versions of PostgreSQL
Suppose you have a table named test1, to which you want to add an auto-incrementing, primary-key id (surrogate) column. The following command should be sufficient in recent versions ...
tmux: How to join two tmux windows into one, as panes?
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This will move the 2nd window as a pane to the 1st window. The opposite command is break-pane
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In a git merge conflict, what are the BACKUP, BASE, LOCAL, and REMOTE files that are generated?
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Git performs a three-way merge, finding the common ancestor (aka "merge base") of the two branches you are merging. When you invoke git mergetool on a conflict, it will produce these files suitable for feeding into a typical 3-way merge tool. Thus:
foo.LOCAL: the "...
NoSQL - MongoDB vs CouchDB [closed]
I am a complete noob when it comes to the NoSQL movement. I have heard lots about MongoDB and CouchDB. I know there are differences between the two. Which do you recommend learning as a first step into the NoSQL world?
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C++常用排序算法汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
...一次找出一个比首位小的值，交换
*
* https://www.tsingfun.com
************************************/
#include<stdio.h>
#include<stdlib.h>
/*
第一种形式的选择排序
选择排序后的顺序为从小到大
*/
void Select_Sort1(int *arr,int len)
{
int i,j;
for(i=0;...
Change Oracle port from port 8080
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From Start | Run open a command window.
Assuming your environmental variables are set correctly start with the following:
C:\>sqlplus /nolog
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Aug 26 10:40:44 2008
Copyright (c) 1982, 2005, Oracle. ...
TargetedPatchingOptOut: “Performance critical to inline across NGen image boundaries”?
... own. You can find more information about that here: https://stackoverflow.com/a/14982340/631802
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