5.6.4 映射集合属性:数组属性

我们先将数据库test里的表删除：

然后新建一个工程，并且编写代码：

Person.java :

public class Person {
	
	private int id;
	private String name;
	private int age;
	private String[] schools;
	
	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 int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
	//数组类型
	public String[] getSchools() {
		return schools;
	}
	public void setSchools(String[] schools) {
		this.schools = schools;
	}
	
	
}

Person.hbm.xml :

<?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="db.domain">
    <class name="Person" table="persons">
    
        <id name="id" type="integer">
            <generator class="native"></generator>
        </id>
        <property name="name" type="string">
            <column name="name"></column>
        </property>
        <property name="age" type="integer">
            <column name="age"></column>
        </property>

        <array name="schools" table="schools">             <!--用array元素-->
            <key column="person_id" not-null="true"/>
            <list-index column="schools_list_order"/>
            <element type="string" column="school_name"/>
        </array>
        
    </class>
</hibernate-mapping>

Test.java :

public class Test {

	public static void main(String[] args) {

		Person p1=new Person();
		p1.setName("tom");
		p1.setAge(20);
		p1.setSchools(new String[]{"小学","初中"});
		
		Person p2=new Person();
		p2.setName("jack");
		p2.setAge(23);
		p2.setSchools(new String[]{"小学","初中","高中"});
		
		Session session=HibernateSessionFactory.getSession();
		Transaction txt=session.beginTransaction();
		session.save(p1);
		session.save(p2);
		txt.commit();
		HibernateSessionFactory.closeSession();
	}

}

运行Test.java ，查看数据库：

对于数组属性，应该使用<array.../>元素完成映射，而<array.../>元素的子元素、属性和<list.../>元素的用法完全一样。