【原创】Hibernate的manytomany例子..

最新推荐文章于 2020-06-10 15:17:11 发布

Kipen

最新推荐文章于 2020-06-10 15:17:11 发布

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分类专栏： Hibernate 文章标签： hibernate myeclipse integer constructor string class

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index.jsp

MyTest.java

public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  Student stu1=new Student();
  stu1.setStuname("stu1");
  Student stu2=new Student();
  stu2.setStuname("stu2");
  Teacher tea1=new Teacher();
  tea1.setTeaname("tea1");
  Teacher tea2=new Teacher();
  tea2.setTeaname("tea2");
  stu1.getTeachers().add(tea1);
  stu1.getTeachers().add(tea2);
  stu2.getTeachers().add(tea1);
  stu2.getTeachers().add(tea2);
  StuDAO studao=new StuDAO();
  studao.save(stu1);
  studao.save(stu2);
}

Student.java

package org.rockie;

import java.util.HashSet;
import java.util.Set;

/**
* Student generated by MyEclipse - Hibernate Tools
*/

public class Student implements java.io.Serializable {

// Fields

     private Integer stuid;
     private String stuname;
     private Set teachers=new HashSet();

// Constructors

public Set getTeachers() {
return teachers;
}

public void setTeachers(Set teachers) {
this.teachers = teachers;
}

/** default constructor */
public Student() {
}

    /** full constructor */
    public Student(String stuname) {
        this.stuname = stuname;
    }

// Property accessors

    public Integer getStuid() {
        return this.stuid;
    }

    public void setStuid(Integer stuid) {
        this.stuid = stuid;
    }

    public String getStuname() {
        return this.stuname;
    }

    public void setStuname(String stuname) {
        this.stuname = stuname;
    }

}

Teacher.java

package org.rockie;

import java.util.HashSet;
import java.util.Set;

/**
* Teacher generated by MyEclipse - Hibernate Tools
*/

public class Teacher implements java.io.Serializable {

// Fields

     private Integer teaid;
     private String teaname;
     private Set students=new HashSet();

// Constructors

public Set getStudents() {
return students;
}

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

/** default constructor */
public Teacher() {
}

    /** full constructor */
    public Teacher(String teaname) {
        this.teaname = teaname;
    }

// Property accessors

    public Integer getTeaid() {
        return this.teaid;
    }

    public void setTeaid(Integer teaid) {
        this.teaid = teaid;
    }

    public String getTeaname() {
        return this.teaname;
    }

    public void setTeaname(String teaname) {
        this.teaname = teaname;
    }

}

StuDAO.java

package org.rockie;

import org.hibernate.Session;
import org.hibernate.Transaction;

public class StuDAO {
public void save(Student stu)
{
  Session session=HibernateSessionFactory.getSession();
  Transaction tx=session.beginTransaction();
   session.save(stu);
  tx.commit();
}

}

Student.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>
    <class name="org.rockie.Student" table="student" catalog="test">
        <id name="stuid" type="java.lang.Integer">
            <column name="stuid" />
            <generator class="native" />
        </id>
        <property name="stuname" type="java.lang.String">
            <column name="stuname" length="50" />
        </property>
        <set name="teachers" table="stu_tea_table" cascade="save-update" inverse="false">
        <key column="stuid"></key>
        <many-to-many class="org.rockie.Teacher" column="teaid"></many-to-many>
        </set>
    </class>
</hibernate-mapping>

Teacher.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>
    <class name="org.rockie.Teacher" table="teacher" catalog="test">
        <id name="teaid" type="java.lang.Integer">
            <column name="teaid" />
            <generator class="native" />
        </id>
        <property name="teaname" type="java.lang.String">
            <column name="teaname" length="50" />
        </property>
        <set name="students" table="stu_tea_table" inverse="true">
        <key column="teaid"></key>
        <many-to-many class="org.rockie.Student" column="stuid"></many-to-many>
        </set>
    </class>
</hibernate-mapping>