HIbernate | 简单对象嵌套实践

src/entity/Course.java

public class Course {
    private Integer courseNo;
    private String courseName;
    public Integer getCourseNo() {
        return courseNo;
    }
    public void setCourseNo(Integer courseNo) {
        this.courseNo = courseNo;
    }
    public String getCourseName() {
        return courseName;
    }
    public void setCourseName(String courseName) {
        this.courseName = courseName;
    }

    
}

src/entity/Student.java

public class Student {
    private Integer id;
    private String studentNo;
    private String name;
    private Course course;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getStudentNo() {
        return studentNo;
    }
    public void setStudentNo(String studentNo) {
        this.studentNo = studentNo;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Course getCourse() {
        return course;
    }
    public void setCourse(Course course) {
        this.course = course;
    }

    
}

src/entity/Student.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="entity">
    <class name="Student" table="student_table">
        <id name="id" type="java.lang.Integer">
            <generator class="identity"/>
        </id>
        <property name="studentNo" />
        <property name="name" />
        
        <many-to-one name="course" cascade="all" class="Course" column="course_no" />
        
    </class>

</hibernate-mapping>

src/entity/Course.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="entity">
    <class name="Course" table="course_table">
        <id name="courseNo" column="course_no">
            <generator class="identity"/>
        </id>
        <property name="courseName" />
    </class>    
    
</hibernate-mapping>

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/test</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>   
        <property name="hibernate.c3p0.max_size">20</property>
        <property name="hibernate.c3p0.min_size">1</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hbm2ddl.auto">update</property>
        <property name="hibernate.format_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">update</property>  
        <mapping resource="entity/Student.hbm.xml"/>
        <mapping resource="entity/Course.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

测试类

        Session session = hibernateUtil.currentSession();
        Transaction tx = session.beginTransaction();
        Student student = new Student();
        Course course = new Course();
        course.setCourseName("蛋疼的软件测试");
        student.setName("wade");
        student.setStudentNo("87937128379821");
        student.setCourse(course);
        
        session.persist(student);
        tx.commit();
        hibernateUtil.closeSession();