This document discusses Object Relational Mapping (ORM), which maps objects in an application to tables and rows in a relational database. ORM provides benefits like leveraging object-oriented programming skills and abstracting away SQL. Common ORM operations like create, read, update, and delete records are demonstrated. Associations between objects like one-to-one, one-to-many, and many-to-many are covered. Popular ORM frameworks for languages like Ruby on Rails, Java, .NET, PHP, and iOS are listed.

1. Object Relational Mapping
by
Abhilash M A

2. What is ORM?
● Relational Database
● Objects
● Mapping between Objects & Relational
Database

3. Why ORM?
● Leverages existing knowledge and skills
related to OOP
● Level of abstraction
● Saves programmer time

4. CRUD
1. Create
○ User.create(:name => ‘asd’, :email => ‘asd@wer.com’)
2. Read
○ @user = User.find(1)
3. Update
○ @user.name = ‘new name’
○ @user.save
4. Delete
○ @user.delete

5. Associations
1. One to One

6. Associations
1. One to One

7. Associations
2. One to Many

8. Associations
3. Many to Many

10. ORM Frameworks
1. Ruby on Rails
○ ActiveRecord
2. Java
○ Hibernate
3. .NET
○ LINQ
○ Entity Framework
4. PHP
○ CodeIgniter
○ CakePHP
5. iOS
○ CoreData

11. Thank You :)