在rails中活动记录和ORM的区别是什么?

Is there any difference between Actice Record and ORM? some of the documentations says both are same. is that true?

Actice记录和ORM有什么区别吗?有些文件说两者都是一样的。这是真的吗?

3 个解决方案

#1

Object Relational Mapping (ORM) is the technique of accessing a relational database using an object-oriented programming language. Object Relational Mapping is a way to manage database data by "mapping" database tables to classes and instances of classes to rows in those tables.

对象关系映射(Object Relational Mapping, ORM)是一种使用面向对象编程语言访问关系数据库的技术。对象关系映射是一种通过将数据库表“映射”到类并将类实例映射到这些表中的行来管理数据库数据的方法。

Active Record is just one of such ORMs, others include:

活动记录只是这样的ORMs之一，其他包括:

Sequel
续集
DataMapper
DataMapper
Squeel
Squeel
Ruby Object Mapper etc.
Ruby对象映射器等。

阅读更多这里https://github.com/learn - co - students/active -记录-力学- crud v - 000 # orm-vs-active-record

#2

Object Relational Mapping (ORM):

对象关系映射(ORM):

simplify the use of databases in applications.

简化应用程序中数据库的使用。

Use objects to hold database records

使用对象保存数据库记录

One class for each table in the database
数据库中的每个表都有一个类
Objects of the class correspond to rows in the table
类的对象对应于表中的行
Attributes of an object correspond to columns from the row

对象的属性对应于行中的列
- Manage the movement of information between objects and the back-end database.
- 管理对象和后端数据库之间的信息移动。
- Manage relationships between tables (joins), turn into linked data structures.
- 管理表(连接)之间的关系，将其转换为链接数据结构。

ActiveRecord Basics

ActiveRecord基础知识

Model: A Rails class corresponding to a database table ActiveRecord:

模型:与数据库表ActiveRecord对应的Rails类:

Base class for models in Rails
Rails中的模型的基类。
Implements Object Relational Mapping
实现了对象关系映射

Example Table

例表

<table>
  <tbody>
    <tr>
      <th> id </th>
      <th>name</th>
      <th>birth</th>
      <th>gpa</th>
      <th>grade</th>
    </tr>
  </tbody>
  <tbody>
    <tr>
      <td> 1 </td>
      <td> Anderson </td>
      <td> 1987-10-22 </td>
      <td>  3.9 </td>
      <td>  2009  </td>
    </tr>
     <tr>
      <td> 2 </td>
      <td> Jones </td>
      <td> 1990-04-16</td>
      <td> 2.4 </td>
      <td>  2012   </td>
    </tr>
 </tbody>
  
  </table>

Create a class for this table (app/models/student.rb):

为该表创建一个类(app/models/student.rb):

class Student < ActiveRecord::Base
end

Or, just use the script/generate program:

或者，使用脚本/生成程序:

ruby script/generate model student

ActiveRecord examines the database schema for this table and makes appropriate attributes and methods available in the class automatically
ActiveRecord检查此表的数据库模式，并自动在类中提供适当的属性和方法

For more information Click Here.

更多信息请点击这里。

#3

I figured it was a pretty simple question, so I' gonna stick to a simple response :

我觉得这是一个非常简单的问题，所以我将坚持一个简单的回答:

ActiveRecord is an ORM for the ruby language.
ActiveRecord是ruby语言的ORM。
Not all ORMs are in ruby, for example Django ORM is in python
并非所有ORM都在ruby中，例如Django ORM在python中
There is other ruby ORMs than ActiveRecord : https://www.ruby-toolbox.com/categories/orm
除了ActiveRecord还有其他ruby orm: https://www.ruby-toolbox.com/classies/orm

=> ActiveRecord ⊂ ruby ORMs ⊂ ORMs

= > ActiveRecord⊂ruby orm⊂orm

#1