How do I delete persistent object in Hibernate?

By Wayan in Hibernate 0 Comment

Continuing the previous example How do I get object from database in Hibernate?, we now add the delete function in our LabelService class.

package org.kodejava.hibernate.service;

import org.hibernate.Session;
import org.kodejava.hibernate.SessionFactoryHelper;
import org.kodejava.hibernate.model.Label;

public class LabelService {
    public Label getLabel(Long id) {
        Session session =
                SessionFactoryHelper.getSessionFactory().getCurrentSession();
        session.beginTransaction();

        // We get back Label object from database by calling the Session
        // object get() method and passing the object type and the object
        // id to be read.
        Label label = session.get(Label.class, id);
        session.getTransaction().commit();

        return label;
    }

    public void deleteLabel(Long id) {
        // Load the object to be deleted
        Label label = getLabel(id);

        // We get the current session and delete the Label object from 
        // database.
        Session session =
                SessionFactoryHelper.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        session.delete(label);
        session.getTransaction().commit();
    }
}

package org.kodejava.hibernate;

import org.kodejava.hibernate.model.Label;
import org.kodejava.hibernate.service.LabelService;

import java.util.Date;

public class DeleteDemo {
    public static void main(String[] args) {
        LabelService service = new LabelService();

        // Creates a Label object we are going to store in the database.
        // We set the name and created date information.
        Label label = new Label();
        label.setName("Sony Music");
        label.setCreated(new Date());

        // Call the LabelManager saveLabel method.
        service.saveLabel(label);

        // Read the object back from database.
        label = service.getLabel(label.getId());
        System.out.println("Label = " + label);

        service.deleteLabel(label.getId());
    }
}

Maven Dependencies

<dependencies>
    <!-- https://search.maven.org/remotecontent?filepath=org/hibernate/hibernate-core/5.6.9.Final/hibernate-core-5.6.9.Final.jar -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>5.6.9.Final</version>
    </dependency>
    <!-- https://search.maven.org/remotecontent?filepath=mysql/mysql-connector-java/8.0.30/mysql-connector-java-8.0.30.jar -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.30</version>
    </dependency>
</dependencies>

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