休眠中的连接问题
我需要使用 hibernate 将我的 song 类与数据库连接起来。但是,hibernate 并没有连接和执行查询。我使用了几种方法和 hibernate 的几个依赖项,但它仍然没有执行。
Song.java
package com.projects.demohibernate;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity(name="Song")
public class Song {
@Id
@Column(name = "id")
private int id;
@Column(name = "Songname")
private String Songname;
@Column(name = "Artist")
private String Artist;
public Song(int id, String songname, String artist) {
this.id = id;
Songname = songname;
Artist = artist;
}
public void setId(int id) {
this.id = id;
}
public void setSongname(String songname) {
Songname = songname;
}
public void setArtist(String artist) {
Artist = artist;
}
}
我的主文件 Source.java
package com.projects.demohibernate;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Source {
public static void main(String[] args) {
Configuration configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
configuration.addAnnotatedClass(Song.class);
SessionFactory sessionFactory = configuration.buildSessionFactory();
try (Session session = sessionFactory.openSession()) {
Song song1 = new Song();
song1.setId(1);
song1.setSongname("Cameo");
song1.setArtist("James Cameo");
System.out.println("Song saved");
session.beginTransaction();
session.save(song1);
session.getTransaction().commit();
sessionFactory.close();
}
}
}
我的配置文件
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/Song</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
<!-- DB schema will be updated if needed -->
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.show_sql">true</property>
name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
</session-factory>
</hibernate-configuration>
我需要在 Hibernate 的帮助下将我的 Song 类与我的 MySql 数据库连接起来。