SQL is a standard language for storing, manipulating and retrieving data in databases. 关系型数据库:RDBMS(Relational Database Mangement System) SQLite3: Rails默认的轻量级数据库,集成于Rails中,在db/development.sqlite3这个档案中. 用途:单机用途.所以在实际部署的时候会换成MySQL等数据库服务器. MySQL: 目前流行的开
一篇看到的讲解得不错的文章 http://blog.csdn.net/clskkk2222/article/details/6735365 这里还有一些例子: Rake Documentation Rails Rake Tutorial Using the Rake Building Language ==================================================================================================
Spring Boot 入门 Spring Boot 简介 > 简化Spring应用开发的一个框架:> 整个Spring技术栈的一个大整合:> J2EE开发的一站式解决方案: 微服务 2014,martin fowler 微服务:架构风格(服务微化) 一个应用应该是一组小型服务:可以通过HTTP的方式进行互通: 单体应用:ALL IN ONE 微服务:每一个功能元素最终都是一个可独立替换和独立升级的软件单元: [详细参照微服务文档](https://martinfowler.com/ar
If you’re just learning Ruby on Rails, you may be confused as to when to generate individual models, resources or scaffolding, and what files are created by each command. Say you want to generate a Test model with a name. You could either generate t
rails2之前创建新项目: rails3以及更高版本创建新项目:rails new webname 创建数据表model:rails g model user name:string sex:string 创建controller:rails g controller user index new create edit update delete 添加字段到user表:rails g migration add_name_and_sex_to_user name:string sex:str
分组查询并统计 SpecialGroup.group(:special_type).count select special_type,count(*) from special_groups group by special_type SpecialGroup.group(:special_type).count(:sno) select special_type,count(sno) from special_groups group by special_type SpecialGroup