In this example we add the function to read a list of records in our LabelService
class. This function will read all Label
persistent object from database. You can see the other functions such as saveLabel
, getLabel
and deleteLabel
in the related example section of this example.
package org.kodejava.hibernate.service;
import org.hibernate.Session;
import org.kodejava.hibernate.SessionFactoryHelper;
import org.kodejava.hibernate.model.Label;
import java.util.List;
public class LabelService {
public List<Label> getLabels() {
Session session =
SessionFactoryHelper.getSessionFactory().getCurrentSession();
session.beginTransaction();
// We read labels record from database using a simple Hibernate
// query, Hibernate Query Language (HQL).
List<Label> labels = session.createQuery("from Label", Label.class)
.list();
session.getTransaction().commit();
return labels;
}
public void saveLabel(Label label) {
// To save an object we first get a session by calling
// getCurrentSession() method from the SessionFactoryHelper class.
// Next we create a new transaction, save the Label object and
// commit it to database,
Session session = SessionFactoryHelper.getSessionFactory()
.getCurrentSession();
session.beginTransaction();
session.save(label);
session.getTransaction().commit();
}
}
package org.kodejava.hibernate;
import org.kodejava.hibernate.model.Label;
import org.kodejava.hibernate.service.LabelService;
import java.util.Date;
import java.util.List;
public class ListDemo {
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, modified by and modified date information.
Label newLabel = new Label();
newLabel.setName("PolyGram");
newLabel.setCreated(new Date());
// Call the LabelManager saveLabel method.
service.saveLabel(newLabel);
List<Label> labels = service.getLabels();
for (Label label : labels) {
System.out.println("Label = " + label);
}
}
}
Maven Dependencies
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.6.9.Final</version>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<version>8.0.33</version>
</dependency>
</dependencies>
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