Group.java代码:
package com.jlee05.one2moneyshuangxiang;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name="T_GROUP")
public class Group {
private int id ;
private String name ;
private Set<User> user = new HashSet<User>() ;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Column(name="name" , length=32)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@OneToMany(mappedBy="group")
@JoinColumn(name="groupId")
public Set<User> getUser() {
return user;
}
public void setUser(Set<User> user) {
this.user = user;
}
}
User.java代码:
package com.jlee05.one2moneyshuangxiang;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
@Entity
@Table(name="T_USER")
public class User {
private int id ;
private String name ;
Group group = new Group() ;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Column(name="name" , length=32)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToOne(cascade={CascadeType.ALL} , fetch=FetchType.LAZY)
@JoinColumn(name="groupId")
public Group getGroup() {
return group;
}
public void setGroup(Group group) {
this.group = group;
}
}
RelationsTest.java代码:
package com.jlee05.one2moneyshuangxiang;
import junit.framework.TestCase;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.junit.Test;
public class RelationsTest extends TestCase {
@Test
public void testShuangXiang() {
SessionFactory sf = new AnnotationConfiguration().configure()
.buildSessionFactory();
Session session = sf.getCurrentSession() ;
session.beginTransaction() ;
session.getTransaction().commit() ;
}
}
hibernate.cfg.xml文件:
<?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>
<!-- 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">root</property>
<property name="connection.password">root</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">100</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.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<!--<property name="hbm2ddl.auto">create</property>-->
<mapping class="com.jlee05.one2moneyshuangxiang.User"/>
<mapping class="com.jlee05.one2moneyshuangxiang.Group"/>
</session-factory>
</hibernate-configuration>
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