Hibernate学习（六）---【一对多双项】

package com.zzn.hibernate.oneToMany;

public class Student {
    private int id;
    private String name;
    private Classes classes;

    public Classes getClasses() {
        return classes;
    }
    public void setClasses(Classes classes) {
        this.classes = classes;
    }
    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;
    }
}

package com.zzn.hibernate.oneToMany;

import java.util.Set;

public class Classes {
    private int id;
    private String name;
    private Set students;

    public Set getStudents() {
        return students;
    }
    public void setStudents(Set students) {
        this.students = students;
    }
    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;
    }


}

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC

"-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

</id>

<many-to-one name="classes" column="classesid" cascade="all"/>

</class>

</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.zzn.hibernate.oneToMany">
    <class name="Classes" table="CLASSES">
        <id name="id" column="id">
            <generator class="native" />
        </id>
        <property name="name" />
        
        <set name="students" cascade="all" inverse="true">
            
            <key column="classesid"/>
            <one-to-many class="Student"/>
        </set>
    </class>
</hibernate-mapping>

TEST

    public void OneToManySaveN() {
        Session session = null;
        Transaction tx = null;
        try {
            session = HibernateUtils.getSession();
            tx = session.beginTransaction();

            Classes classes = new Classes();
            classes.setName("俄罗斯");

            Student student = new Student();
            student.setName("列宁");
            student.setClasses(classes);
            session.save(student);

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (session != null) {
                if (session.isOpen()) {
                    tx.commit();
                    session.close();
                }
            }
        }
    }

    public void OneToManyLoadN() {
        Session session = null;
        Transaction tx = null;
        try {
            session = HibernateUtils.getSession();
            tx = session.beginTransaction();

            Student    student = (Student)session.load(Student.class, 6);
            System.out.println(student.getName());
            System.out.println(student.getClasses().getName());

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (session != null) {
                if (session.isOpen()) {
                    tx.commit();
                    session.close();
                }
            }
        }
    }

posted on 2009-11-01 16:30 生命的绽放阅读(326) 评论(0) 编辑收藏所属分类: Hibernate

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