Hibernate One To Many Example

Hibernate one to many mapping is one of the mapping technique you should mastering if you want to develop applications using Hibernate as a data persistence. In this tutorial i will give an example of hibernate one to many mapping with practical example of relation between entity Fakultas and entity Jurusan.

#1 Relation Table Hibernate One To Many

From the picture above, it can be inferred that one Fakultas can have many Jurusan

#2 Hibernate One To Many Class Model

Adjusting with the table that we have, we create 2 entity classes which are Fakultas dan Jurusan

class Fakultas

package comboboxterhubung.entity;

import java.util.ArrayList;
import java.util.List;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name="fakultas")
public class Fakultas {
    @Id
    @Column(name="id_fakultas")
    private String idFakultas;
    
    @Column(name="nama_fakultas")
    private String namaFakultas;
    
    @OneToMany(mappedBy = "fakultas")
    private List<Jurusan> jurusans=new ArrayList<Jurusan>();

    public String getIdFakultas() {
        return idFakultas;
    }

    public void setIdFakultas(String idFakultas) {
        this.idFakultas = idFakultas;
    }

    public String getNamaFakultas() {
        return namaFakultas;
    }

    public void setNamaFakultas(String namaFakultas) {
        this.namaFakultas = namaFakultas;
    }

    public List<Jurusan> getJurusans() {
        return jurusans;
    }

    public void setJurusans(List<Jurusan> jurusans) {
        this.jurusans = jurusans;
    }

    @Override
    public String toString() {
        return  namaFakultas;
    }
    
    
}

package comboboxterhubung.entity;

import java.util.ArrayList;

import java.util.List;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.Id;

import javax.persistence.OneToMany;

import javax.persistence.Table;

@Entity

@Table(name="fakultas")

public class Fakultas {

@Id

@Column(name="id_fakultas")

private String idFakultas;

@Column(name="nama_fakultas")

private String namaFakultas;

@OneToMany(mappedBy = "fakultas")

private List<Jurusan> jurusans=new ArrayList<Jurusan>();

public String getIdFakultas() {

return idFakultas;

}

public void setIdFakultas(String idFakultas) {

this.idFakultas = idFakultas;

}

public String getNamaFakultas() {

return namaFakultas;

}

public void setNamaFakultas(String namaFakultas) {

this.namaFakultas = namaFakultas;

}

public List<Jurusan> getJurusans() {

return jurusans;

}

public void setJurusans(List<Jurusan> jurusans) {

this.jurusans = jurusans;

}

@Override

public String toString() {

return namaFakultas;

}

class Jurusan

package comboboxterhubung.entity;

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

@Entity
@Table(name="jurusan")
public class Jurusan {
    @Id
    @Column(name="id_jurusan")
    private String idJurusan;
    
    @Column(name="nama_jurusan")
    private String namaJurusan;
    
    @JoinColumn(name="id_fakultas")
    @ManyToOne
    private Fakultas fakultas;

    public String getIdJurusan() {
        return idJurusan;
    }

    public void setIdJurusan(String idJurusan) {
        this.idJurusan = idJurusan;
    }

    public String getNamaJurusan() {
        return namaJurusan;
    }

    public void setNamaJurusan(String namaJurusan) {
        this.namaJurusan = namaJurusan;
    }

    public Fakultas getFakultas() {
        return fakultas;
    }

    public void setFakultas(Fakultas fakultas) {
        this.fakultas = fakultas;
    }

    @Override
    public String toString() {
        return  namaJurusan;
    }
    
    
}

package comboboxterhubung.entity;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.ManyToOne;

import javax.persistence.Table;

@Entity

@Table(name="jurusan")

public class Jurusan {

@Id

@Column(name="id_jurusan")

private String idJurusan;

@Column(name="nama_jurusan")

private String namaJurusan;

@JoinColumn(name="id_fakultas")

@ManyToOne

private Fakultas fakultas;

public String getIdJurusan() {

return idJurusan;

}

public void setIdJurusan(String idJurusan) {

this.idJurusan = idJurusan;

}

public String getNamaJurusan() {

return namaJurusan;

}

public void setNamaJurusan(String namaJurusan) {

this.namaJurusan = namaJurusan;

}

public Fakultas getFakultas() {

return fakultas;

}

public void setFakultas(Fakultas fakultas) {

this.fakultas = fakultas;

}

@Override

public String toString() {

return namaJurusan;

}

#3 COnfig File Hibernate One To Many

Put Fakultas and Jurusan class in the config file like this.

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="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/comboboxterhubung?zeroDateTimeBehavior=convertToNull</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">root</property>
    <mapping class="comboboxterhubung.entity.Fakultas"/>
    <mapping class="comboboxterhubung.entity.Jurusan"/>
  </session-factory>
</hibernate-configuration>

<?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="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/comboboxterhubung?zeroDateTimeBehavior=convertToNull</property>

</session-factory>

</hibernate-configuration>

#4 Running Hibernate One To Many Application

public static void main(String[] args) throws SQLException {
   Session session=HibernateUtil.getSessionFactory().openSession();
        session.getTransaction().begin();
        
        Fakultas fakultas=new Fakultas();
        fakultas.setIdFakultas("fak-004");
        fakultas.setNamaFakultas("Fakultas Hukum");
        
        Jurusan jurusan=new Jurusan();
        jurusan.setIdJurusan("hukum-001");
        jurusan.setNamaJurusan("Hukum Publik");
        
        jurusan.setFakultas(fakultas);
        fakultas.getJurusans().add(jurusan);
        
        session.save(fakultas);
        session.save(jurusan);
        
        session.getTransaction().commit();
        session.close();
        System.out.println("Done");
}

public static void main(String[] args) throws SQLException {

Session session=HibernateUtil.getSessionFactory().openSession();

session.getTransaction().begin();

Fakultas fakultas=new Fakultas();

fakultas.setIdFakultas("fak-004");

fakultas.setNamaFakultas("Fakultas Hukum");

Jurusan jurusan=new Jurusan();

jurusan.setIdJurusan("hukum-001");

jurusan.setNamaJurusan("Hukum Publik");

jurusan.setFakultas(fakultas);

fakultas.getJurusans().add(jurusan);

session.save(fakultas);

session.save(jurusan);

session.getTransaction().commit();

session.close();

System.out.println("Done");

}

Happy Coding 😀
Jaya Jaya Wijayanti!

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Agung Setiawan

Create Things and Build Stuff

Hibernate One To Many Example – Annotation

#1 Relation Table Hibernate One To Many

#2 Hibernate One To Many Class Model

#3 COnfig File Hibernate One To Many

#4 Running Hibernate One To Many Application

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