Hibernate Annotation version of Hello world instance
- 2020-05-07 19:35:02
- OfStack
This article illustrates the implementation of Hello world version Annotation of Hibernate. Share with you for your reference, as follows:
Packages to be introduced: hibernate-commons-annotations-4.0.4.Final.jar
Since I'm using hibernate-release-4.3.5.Final, it's already in the required directory.
bean:
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="teacher")
public class Teacher {
private int id;
private String name;
private String title;
@Id
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Column(name="name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Column(name="title")
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
The corresponding hibernate.cfg.xml file:
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="connection.username"></property>
<property name="connection.password"></property>
<!-- JDBC connection pool (use the built-in) -->
<!--
<property name="connection.pool_size">1</property>
-->
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<!--
<property name="hbm2ddl.auto">update</property>
-->
<mapping resource="com/hibernate/model/Student.hbm.xml"/>
<mapping class="com.hibernate.model.Teacher"/>
</session-factory>
</hibernate-configuration>
The test class:
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import com.huxing.hibernate.model.Student;
import com.huxing.hibernate.model.Teacher;
public class StudentTest {
public static void main(String[] args) {
Student a = new Student();
a.setId(123);
a.setAge(32);
a.setName("hello hibernate!");
Teacher tea = new Teacher();
tea.setId(4);
tea.setName("mysql");
tea.setTitle("high");
Configuration cfg = new AnnotationConfiguration();
SessionFactory cf = cfg.configure().buildSessionFactory();
Session session = cf.openSession();
session.beginTransaction();
session.save(tea);
session.getTransaction().commit();
session.close();
cf.close();
}
}
Note: the code omits the package path.
Other aspects:
1. Annotations can be added to attributes or to get methods.
2. The difference between annotated mapping and xml configuration xml! One is resource, one is class.
I hope this article is helpful for you to design Hibernate framework program.