Hibernate一对多单向关系

1.   数据库schema

Teachers表:

create table TEACHERS

(

  ID          NUMBER(10) not null,

  TEACHERNAME VARCHAR2(15)

)

alter table TEACHERS

  add constraint DERE primary key (ID)

 

Students表：

create table STUDENTS

(

  ID          NUMBER(10) not null,

  STUDENTNAME VARCHAR2(15),

  TEACHER_ID  NUMBER(10)

)

alter table STUDENTS

  add constraint RERE primary key (ID)

alter table STUDENTS

  add constraint FFF foreign key (TEACHER_ID)

  references TEACHERS (ID);

 

2.   Teacher.java和Student.java

Teacher.java

package mypack;

 

public class Teacher {

  //教师id

  private Long id;

 

  //教师名称

  private String teacherName;

 

  /**

   * 缺省构造函数

   */

  public Teacher() {

  }

 

  /**

   * 得到教师id

   * @return Long    教师id

   */

  public Long getId() {

    return id;

  }

 

  /**

   * 设置教师id

   * @param id Long    教师id

   */

  public void setId(Long id) {

    this.id = id;

  }

 

  /**

   * 得到教师名称

   * @return String    教师名称

   */

  public String getTeacherName() {

    return teacherName;

  }

  

  /**

   * 设置教师名称

   * @param teacherName String    教师名称

   */

  public void setTeacherName(String teacherName) {

    this.teacherName = teacherName;

  }

 

  /**

   * 构造函数

   * @param teacherName String

   */

  public Teacher(String teacherName) {

    this.teacherName = teacherName;

  }

}

 

Student.java

package mypack;

 

public class Student {

  //学生id

  private Long id;

 

  //学生名称

  private String studentName;

 

  //教师类

  private Teacher teacher;

 

  /**

   * 缺省构造函数

   */

  public Student() {

  }

 

  /**

   * 得到学生id

   * @return Long    学生id

   */

  public Long getId() {

    return id;

  }

 

  /**

   * 设置学生id

   * @param id Long    学生id

   */

  public void setId(Long id) {

    this.id = id;

  }

 

  /**

   * 得到学生名称

   * @return String    学生名称

   */

  public String getStudentName() {

    return studentName;

  }

 

  /**

   * 设置学生名称

   * @param studentName String    学生名称

   */

  public void setStudentName(String studentName) {

    this.studentName = studentName;

  }

 

  /**

   * 得到教师对象

   * @return Teacher    教师对象

   */

  public Teacher getTeacher() {

    return teacher;

  }

 

  /**

   * 设置教师对象

   * @param teacher Teacher    教师对象

   */

  public void setTeacher(Teacher teacher) {

    this.teacher = teacher;

  }

 

  /**

   * 构造函数

   * @param string String

   * @param teacher Teacher

   */

  public Student(String studentName, Teacher teacher) {

    this.studentName = studentName;

    this.teacher = teacher;

  }

}

 

3.   hibernate.properties

## Oracle

 

hibernate.dialect net.sf.hibernate.dialect.Oracle9Dialect

hibernate.dialect net.sf.hibernate.dialect.OracleDialect

hibernate.connection.driver_class oracle.jdbc.driver.OracleDriver

hibernate.connection.username jbcm

hibernate.connection.password jbcm

hibernate.connection.url jdbc:oracle:thin:@localhost:1521:wsy

 

4.   Teacher.hbm.xml和Student.hbm.xml

Teacher.hbm.xml

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping

PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping >

 

  <class name="mypack.Teacher" table="teachers" >

    <id name="id" type="long" column="ID">

      <generator class="increment"/>

    </id>

 

    <property name="teacherName" type="string" >

        <column name="teacherName" length="15" />

    </property>

 

  </class>

 

</hibernate-mapping>

 

Student.hbm.xml

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping

PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping >

 

  <class name="mypack.Student" table="students" >

    <id name="id" type="long" column="ID">

      <generator class="increment"/>

    </id>

 

    <property name="studentName" type="string" >

        <column name="studentName" length="15" />

    </property>

 

   <many-to-one

        name="teacher"

        column="teacher_id"

        class="mypack.Teacher"

        cascade="save-update"

       />

 

  </class>

 

</hibernate-mapping>

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