Migrations are a way to make database changes or updates, like creating or dropping tables, as well as updating a table with new columns with constraints via generated scripts. We can build these scripts via the command line using knex command line tool.
To learn more about migrations, check out this article on the different types of database migrations!
| 相同的colorschema，vim和gvim的颜色差距还是很大的，因为gvim使用X的颜色，而vim只能使用终端提供的颜色，所以造成了二者的显示差异。 | |
| xterm开启256色 | |
| 现在的终端模拟器早就支持256色了，不过默认可能还是8色的。 | |
| 开启xterm终端，查看xterm终端支持的颜色 | |
| 命令： | |
| $ tput colors | |
| 8 |
| #!/bin/bash | |
| mv /apps/opt/rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/specifications/default/json-1.8.3.gemspec /apps/opt/rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/specifications | |
| gem uninstall json -v '1.8.3' | |
| echo "done!" |
| // 客户端实现 | |
| const net = require('net') | |
| const tls = require('tls') | |
| const localServer = new net.Server() | |
| localServer.on('connection', (socket) => { | |
| socket.pause() | |
| const context = { |
if you got this error while requesting the application via JSON request:
exception ActionController::InvalidAuthenticityToken
backtrace":"[\"/home/uadmin/.rvm/gems/ruby-2.1.7/gems/actionpack-4.2.4/lib/action_controller/metal/request_forgery_protection.rb:181:in `handle_unverified_request'\",
\"/home/uadmin/.rvm/gems/ruby-2.1.7/gems/actionpack-4.2.4/lib/action_controller/metal/request_forgery_protection.rb:209:in `handle_unverified_request'\",
...
| public class HttpManager { | |
| private static final String TAG = "HttpManager"; | |
| private static HttpManager mInstance = null; | |
| private OkHttpClient httpClient; | |
| public static HttpManager getInstance() { | |
| if (mInstance == null) { |
| #!/usr/bin/env bash | |
| # https://docs.docker.com/install/linux/docker-ce/ubuntu/ | |
| sudo apt-get install apt-transport-https ca-certificates curl software-properties-common | |
| curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - | |
| sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable" | |
| sudo apt-get update | |
| sudo apt-get install docker-ce | |
| # https://docs.docker.com/compose/install/ |
| (setq enh-ruby-program "/home/gnufied/.rbenv/versions/1.9.3-p448/bin/ruby") | |
| (autoload 'enh-ruby-mode "enh-ruby-mode" "Major mode for ruby files" t) | |
| (add-to-list 'auto-mode-alist '("\\.rb$" . enh-ruby-mode)) | |
| (add-to-list 'auto-mode-alist '("\\.rake$" . enh-ruby-mode)) | |
| (add-to-list 'auto-mode-alist '("Rakefile$" . enh-ruby-mode)) | |
| (add-to-list 'auto-mode-alist '("\\.gemspec$" . enh-ruby-mode)) | |
| (add-to-list 'auto-mode-alist '("\\.ru$" . enh-ruby-mode)) | |
| (add-to-list 'auto-mode-alist '("Gemfile$" . enh-ruby-mode)) | |
| (add-to-list 'interpreter-mode-alist '("ruby" . enh-ruby-mode)) |
新款的树莓派3B功能之丰富，性能之强悍，让我垂涎。考虑到家里的网件 WNDR3700v2 也服役四年有余了。还是败了一个树莓派3B回来打造成新的路由。
WARNING 本文所有指令均仅供参考，切勿无脑复制粘贴！
〇 安装系统