hibernate关联映射-多对一

package sa.fs121.domain;

public class Department {

  private int id;
  private String name;

  public int getId() { 织梦内容管理系统
    return id;
  }

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

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

}

package sa.fs121.domain;

public class Employee {
  private int id;
  private String name;
  private Department depart;

  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 Department getDepart() {
    return depart;
  }

  public void setDepart(Department depart) {
    this.depart = depart;
  }

}

<hibernate-mapping package="sa.fs121.domain"> 织梦内容管理系统

  <class name="Employee">
    <id name="id">
      <generator class="native" />
    </id>

    <property name="name" />
    <!--    
    表示员工的depart属性,对应depart表中的id值,参考depart中id值表示的整个对象;

copyright dedecms

    通过反射,hibernate可以找到depart对应的department类,
    然后通过depart这个对象的id值,找到department表中的参考外键,
    缺省情况下,hibernate外键参考的对象,就是department表中的主键id.
    即:depart参考的,就是department这个表中的主键,也可以手工指定参考对象:
    使用:property-ref="xxxx",进行声明
     -->
    <many-to-one name="depart" column="depart_id" />
  </class>

</hibernate-mapping> 织梦内容管理系统

  内容来自dedecms

<hibernate-mapping package="sa.fs121.domain">
  <class name="Department">
    <id name="id">
      <generator class="native" />

    </id>

    <property name="name" unique="true" />
  </class>
</hibernate-mapping> 本文来自织梦

  本文来自织梦

static Department add() {
    Session s = null;
    Transaction tx = null;

    try {
      Department depart = new Department();
      depart.setName("department1");

      Employee employee = new Employee();
      employee.setName("user1");

copyright dedecms

      employee.setDepart(depart);

      s = HibernateUtils.getSession();
      tx = s.beginTransaction();
      s.save(depart);
      s.save(employee);

      tx.commit();

      return depart;
    } catch (HibernateException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } finally {
      if (s != null) {
        s.close();
      }
    } copyright dedecms
    
    return null;
  }