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Hibernate One To Many Annotation Example

Hibernate » on Aug 30, 2011 { 10 Comments } By Sivateja

Let us see an example on one to many annotations mapping…

Files required..

  • Customers.java
  • Vendor.java
  • ForOurLogic.java
  • hibernate.cfg.xml

Customers.java

package str;

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

@Entity
@Table(name = "Customers")
public class Customers{

	@Id
	@Column(name = "custid")
	private int customerId;

	@Column(name = "custName", length=10)
	private String customerName;

	public int getCustomerId() {
		return customerId;
	}

	public void setCustomerId(int customerId) {
		this.customerId = customerId;
	}

	public String getCustomerName() {
		return customerName;
	}

	public void setCustomerName(String customerName) {
		this.customerName = customerName;
	}

}

Vendor.java

package str;

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name = "Vendor")

public class Vendor{

	@Id
	@Column(name = "vid")
	private int vendorId;

	@Column(name = "vname", length=10)
	private String vendorName;

	@OneToMany(fetch=FetchType.LAZY, targetEntity=Customers.class, cascade=CascadeType.ALL)
	@JoinColumn(name = "venid", referencedColumnName="vid")

	private Set children;

	public int getVendorId() {
		return vendorId;
	}

	public void setVendorId(int vendorId) {
		this.vendorId = vendorId;
	}

	public String getVendorName() {
		return vendorName;
	}

	public void setVendorName(String vendorName) {
		this.vendorName = vendorName;
	}

	public Set getChildren() {
		return children;
	}

	public void setChildren(Set children) {
		this.children = children;
	}	

}

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver
</property>
<property name="connection.url">jdbc:oracle:thin:@www.java4s.com:1521:XE</property>
<property name="connection.username">system</property>
<property name="connection.password">admin</property>

<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>

<mapping></mapping>
<mapping></mapping>
</session-factory>
</hibernate-configuration>

ForOurLogic.java

package str;

import java.util.HashSet;
import java.util.Set;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

public class ForOurLogic { 

	public static void main(String[] args)
	{

		Configuration cfg = new Configuration();
		cfg.configure("hibernate.cfg.xml"); 

		SessionFactory factory = new AnnotationConfiguration().configure().buildSessionFactory();
		Session session = factory.openSession();		

	      Vendor v=new Vendor();
	      v.setVendorId(100);
	      v.setVendorName("java4s");

	      Customers c1=new Customers();
	      c1.setCustomerId(500);
	      c1.setCustomerName("customer1");

	      Customers c2=new Customers();
	      c2.setCustomerId(501);
	      c2.setCustomerName("customer2");

	      Set s=new HashSet();
	      s.add(c1);
	      s.add(c2);

	      v.setChildren(s);

	      Transaction tx=session.beginTransaction();
	           session.save(v);
	      tx.commit();

		session.close();
		System.out.println("One to Many Annotatios Done...!!!!!!");
		factory.close();
	}

}

Output

 

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Comments

10 Responses to “Hibernate One To Many Annotation Example”
  1. raju says:

    Hi Admin,

    Your code is executing perfectly,But i think is not right way.B’coz if the operation faild to insert values into chaild table then the insertion of parent table also should be rollback.But with this code i can’t get such outcome.(If i am wrong please correct me.)

    Thaks & Regords
    raju.

  2. Configuration cfg = new Configuration();
    cfg.configure(“hibernate.cfg.xml”);

    this is not required.
    Pls correct it..

  3. sasi says:

    Configuration cfg = new Configuration();
    cfg.configure(“hibernate.cfg.xml”);

    SessionFactory factory = new AnnotationConfiguration().configure().buildSessionFactory();
    Session session = factory.openSession();

    so we have to write Configuration and AnnotationConfiguration??

  4. Mohan says:

    Configuration cfg = new Configuration();
    cfg.configure(“hibernate.cfg.xml”);

    The above code not required.

    • shantanu Surve says:

      Configuration cfg=new Configuration();
      cfg.configure("hibernate.cfg.xml");
      this code works good in hibernate version 4. But will not work till hibernate version 3. For that we
      need AnnotationConfiguration class i.e.
      Configuration cfg=new AnnotationConfiguration();
      cfg.configure("hibernate.cfg.xml");

      this code is required. AnnotationConfiguration this class is deprecated from version 4. So for compatibility for both the version he has wrote both the codes.

  5. Ashoka says:

    hii…..!

    u r just providing example….and not providing any explanation regarding @OneToMany annnotation and its attributes….!

  6. radheshyam says:

    perfect…add for retrieval also..!!!!!!!

  7. aman says:

    Exception in thread "main" org.hibernate.MappingException: <mapping> element in configuration specifies no attributes
    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1326)
    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1285)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1267)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1234)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1162)
    at com.str.ForOurLogic.main(ForOurLogic.java:18)

  8. sundar says:

    Where will i get require jar file to run the code

  9. arun singh says:

    Great help

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