This document discusses object relational mapping (ORM) tools. It defines ORM as providing mapping between objects and database tables, generating and running SQL queries, and avoiding SQL injections. It lists common ORM tools for various programming languages including Hibernate and JPA for Java. The document explains that JPA is the ORM standard for Java, and Hibernate is a popular Java ORM framework. It provides examples of JPA annotations used for mapping objects to database tables, including @Entity, @Id, @Column, @Table, and annotations for mapping relationships like @OneToOne, @OneToMany, and @ManyToOne.

1. Internet Programming II
Yildiz Technical University 2015
Object Relational Mapping
Ömer Taşkın

2. OUTLINE
•What is ORM?
•Most known ORM Tools
•JPA & Hibernate
IP II - ORM 2

3. What is ORM?
IP II - ORM 3
•Provides to mapping Objects to DB tables and vice versa
•Generates and runs SQL queries
•Avoids SQL Injections

4. ORM Tools
IP II - ORM 4
• .net - nHibernate
• .net – Ado.net Entity Framework
• Java – Hibernate
• Java – EclipseLink
• Java – TopLink
• PHP – Doctrine
• Python – Django
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5. Jpa & Hibernate
IP II - ORM 5
•JPA is orm standard of Java
•Hibernate is one of most used Java Orm framework
•allows writing hql queries like SQL
•has Criteria API

6. Jpa & Hibernate
IP II - ORM 6
@Entity annotation declares a class as an entity.
@Table annotation is used to declare tablename and schema
@Id annotation lets you define which property is the identifier (PRIMARY KEY) of
your entity
@Column annotation declares field name
@Table(name = “customer”)
@Id
@Column(“CUSTOMER_ID”)
private Integer customerId;

7. Jpa & Hibernate - Join
IP II - ORM 7
@OneToOne annotation is used for 1-1 mapping
@OneToMany annotation is used for 1-n mapping
@ManyToOne annotation is used for n-1 mapping
@ManyToMany annotation is used for n-n mapping
@JoinColumn annotation declares which column would be join field
@ManyToOne
@JoinField(“MEMBER_ID”)
private Member member;

8. Jpa & Hibernate – Fully mapped example
IP II - ORM 8
@Entity
@Table
public class Customer {
@Id
@GeneratedValue
@Column(name = “CUSTOMER_ID”)
private Integer customerId;
@Column(name = “CUSTOMER_NAME”)
private String customerName;
// getter & setters
}