Java Code House

Today I am going to discuss with the first step of JPA - Java Persistence API. JPA helps you in object-relational mapping and reduces a lot of task of coders, otherwise they have to write a lot of JDBC codes. All those things are done automatically by the Persistence provider. Throughout all the topics related to JPA that we will cover will consider EclipseLink as the JPA provider.
    After all necessary setups, the first thing you will have to do is to write a JPA entity. Many IDE like Eclipse can automatically create it, but we will show how to write it and what are the steps. You must have seen the JavaBean style classes. Here our first task is to write a class in that style only. Next we will make some modifications to make it a JPA entity.
We will create a class named Employee. But you must remember that the entity name must match with the name of a table in database (though it can differ, we will only deal with name of table as same as entity).

public class Employee {
 private int id;
 private String name;
 private double salary;
 
 public int getId() { return id; }
 public void setId(int id) { this.id = id; }
 
 public String getName() { return name; }
 public void setName(String name) { this.name = name; }
 
 public double getSalary() { return salary; }
 public void setSalary(double salary) { this.salary = salary;}
}

CREATE TABLE Employee
            (id number primary key,name varchar(30),salary float);