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ORM: Object-relational mapping
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Abhilash M A
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ORM: Object-relational mapping
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
9.
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 :)
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