哪位有HIBERNATE一对多,多对一的例子啊有的话发一个啦

public class Group {
   
    private int id;
   
    private String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

public class User {
   
    private int id;
   
    private String name;
   
    private Group group;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Group getGroup() {
        return group;
    }

    public void setGroup(Group group) {
        this.group = group;
    }
   
}
两个实体类！

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.
<hibernate-mapping>
    <class name="Group" table="t_group">
        <id name="id">
            <generator class="native"/>
        </id>
        <property name="name"/>
    </class>
</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.
<hibernate-mapping>
    <class name="User" table="t_user">
        <id name="id">
            <generator class="native"/>
        </id>
        <property name="name"/>
        <!--
        <many-to-one name="group" column="groupid" cascade="all"/>
         -->
         <many-to-one name="group" column="groupid"/>
    </class>
</hibernate-mapping>

配置文件！

上面是多对一的列子