Hibernate Many to One tutorial and example Annotation based


Many to One Unidirectional Association Mapping Annotation


@ManyToOne(cascade = CascadeType.ALL)


Code

Student.java

package com.candidjava.hibernate;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name = "STUDENT")
public class Student {

	private long studentId;
	private String studentName;
	private Address studentAddress;

	public Student() {
	}

	public Student(String studentName, Address studentAddress) {
		this.studentName = studentName;
		this.studentAddress = studentAddress;
	}

	@Id
	@GeneratedValue
	@Column(name = "STUDENT_ID")
	public long getStudentId() {
		return this.studentId;
	}

	public void setStudentId(long studentId) {
		this.studentId = studentId;
	}

	@Column(name = "STUDENT_NAME", nullable = false, length = 100)
	public String getStudentName() {
		return this.studentName;
	}

	public void setStudentName(String studentName) {
		this.studentName = studentName;
	}

	@ManyToOne(cascade = CascadeType.ALL)
	public Address getStudentAddress() {
		return this.studentAddress;
	}

	public void setStudentAddress(Address studentAddress) {
		this.studentAddress = studentAddress;
	}

}


Address.java

package com.candidjava.hibernate;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "ADDRESS")
public class Address {

	private long addressId;
	private String street;
	private String city;
	private String state;
	private String zipcode;

	public Address() {
	}

	public Address(String street, String city, String state, String zipcode) {
		this.street = street;
		this.city = city;
		this.state = state;
		this.zipcode = zipcode;
	}

	@Id
	@GeneratedValue
	@Column(name = "ADDRESS_ID")
	public long getAddressId() {
		return this.addressId;
	}

	public void setAddressId(long addressId) {
		this.addressId = addressId;
	}

	@Column(name = "ADDRESS_STREET", nullable = false, length = 250)
	public String getStreet() {
		return this.street;
	}

	public void setStreet(String street) {
		this.street = street;
	}

	@Column(name = "ADDRESS_CITY", nullable = false, length = 50)
	public String getCity() {
		return this.city;
	}

	public void setCity(String city) {
		this.city = city;
	}

	@Column(name = "ADDRESS_STATE", nullable = false, length = 50)
	public String getState() {
		return this.state;
	}

	public void setState(String state) {
		this.state = state;
	}

	@Column(name = "ADDRESS_ZIPCODE", nullable = false, length = 10)
	public String getZipcode() {
		return this.zipcode;
	}

	public void setZipcode(String zipcode) {
		this.zipcode = zipcode;
	}

}


save or inserting record into many to one annotation mapping

	public void insertStudent(Student bk) {
		try {
			Session s = getSession();
			Transaction transaction = s.beginTransaction();
			s.save(bk);
			// s.save(b);
			transaction.commit();

		} catch (HibernateException e) {
			e.printStackTrace();
		}

	}

Get or fetch record from many to one annotation mapping

       public Student getStudent(long id) {
		Student ls = new Student();
		try {
			Session s = getSession();
			ls = (Student) s.load(Student.class, id);
			// System.out.println(ls.size());
		} catch (HibernateException e) {
			System.out.println(e.getMessage());
		}
		return ls;
	}

Download

Many to one annotation example war

Many to one annotation example zip





Comments


©candidjava.com