hibernate由关系导出到数据库

最新推荐文章于 2022-01-05 15:34:36 发布

shangtongwei

最新推荐文章于 2022-01-05 15:34:36 发布

阅读量509

点赞数

CC 4.0 BY-SA版权

分类专栏： j2ee 文章标签： hibernate class string generator session myeclipse

本文链接：https://blog.youkuaiyun.com/shangtongwei/article/details/5307761

j2ee 专栏收录该内容

47 篇文章

订阅专栏

本文介绍了一对多关系中使用Hibernate进行数据库映射的方法，包括Classes与Student类的设计及XML配置，演示了如何通过Hibernate创建对应的数据库表。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

package com.hp.shangtongwei.hibernate;

import java.util.Set;

public class Classes {

private int id;

private String name;

private Set students;

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 Set getStudents() {
return students;
}

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

}

package com.hp.shangtongwei.hibernate;

public class Student {

private int id;

private String name;

private Classes classes;

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 Classes getClasses() {
return classes;
}

public void setClasses(Classes classes) {
this.classes = classes;
}
}

<?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 package="com.hp.shangtongwei.hibernate">
<class name="Classes" table="t_classes">
  <id name="id">
   <generator class="native"/>
  </id>
  <property name="name"/>
  <set name="students" inverse="true" cascade="all">
   <key column="classesid"/>
   <one-to-many class="Student"/>
  </set>
</class>
</hibernate-mapping>

<?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.hp.shangtongwei.hibernate.Student" table="t_student">
  <id name="id">
   <generator class="native"/>
  </id>
  <property name="name"/>
  <many-to-one name="classes" column="classesid"/>
</class>
</hibernate-mapping>

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_one2many_1</property>
  <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
  <property name="hibernate.connection.username">root</property>
  <property name="hibernate.connection.password">root</property>
  <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
  <property name="hibernate.show_sql">true</property>

  <mapping resource="com/hp/shangtongwei/hibernate/Classes.hbm.xml"/>
  <mapping resource="com/hp/shangtongwei/hibernate/Student.hbm.xml"/>
    </session-factory>

</hibernate-configuration>

package com.hp.shangtongwei.hibernate;

import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class ExportDB {

public static void main(String[] args) {

  //读取hibernate.cfg.xml文件
  Configuration cfg = new Configuration().configure();

  SchemaExport export = new SchemaExport(cfg);

  export.create(true, true);
}
}

package com.hp.shangtongwei.hibernate;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtils {

private static SessionFactory factory;

static {
  try {
   Configuration cfg = new Configuration().configure();
   factory = cfg.buildSessionFactory();
  }catch(Exception e) {
   e.printStackTrace();
  }
}

public static SessionFactory getSessionFactory() {
  return factory;
}

public static Session getSession() {
  return factory.openSession();
}

public static void closeSession(Session session) {
  if (session != null) {
   if (session.isOpen()) {
    session.close();
   }
  }
}
}