Hibernate 多对多删除操作

最新推荐文章于 2021-02-24 01:30:02 发布

最新推荐文章于 2021-02-24 01:30:02 发布 · 69 阅读

文章标签：

#java

本文介绍Hibernate框架中实现多对多关系的配置方法，并通过教师与课程实例展示具体实现细节及注意事项。

Hibernate 多对多删除操作(many-to-many)

Hibernate多对多的例子不少，但仔细一看，大多数都是保存的，删除谈的少，但问题还不少，因此有必须简单测试一下，以下我们来个简单的多对多关系建立

老师Teacher 与课程Course 是一个多对多的关系，Pojo与XMl配置如下。

Pojo

/**
* Course Entity
* see table: tbl_course
*/
package com.leo.domain;

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

/**
* @author superleo
*
*/
public class Course {

private String id;

private String name;

private Set<Teacher> teachers = new HashSet<Teacher>();

public String getId() {
return id;
}

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

public String getName() {
return name;
}

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

public Set<Teacher> getTeachers() {
return teachers;
}

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

}

/**
* Teacher Entity
* see table: tbl_teacher
*/
package com.leo.domain;

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

/**
* @author superleo
*
*/
public class Teacher {

private String id;

private String name;

private Set<Course> courses = new HashSet<Course>();

public String getId() {
return id;
}

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

public String getName() {
return name;
}

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

public Set<Course> getCourses() {
return courses;
}

public void setCourses(Set<Course> courses) {
this.courses = courses;
}

}

Hibernate配置文件：

<?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="com.leo.domain.Course" table="tbl_course"
batch-size="100" dynamic-insert="true" dynamic-update="true">
<id name="id" column="id">
<generator class="uuid" />
</id>
<property name="name" column="name" type="string" />

</class>
</hibernate-mapping>

Xml代码：

<?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="com.leo.domain.Teacher" table="tbl_teacher"
batch-size="100" dynamic-insert="true" dynamic-update="true">
<id name="id" column="id">
<generator class="uuid" />
</id>
<property name="name" column="name" type="string" />

</class>
</hibernate-mapping>