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Shun 发表于 2021-10-23 15:11:51

简单的手工hibernate程序示例

本文讲述了简单的手工hibernate程序示例。分享给大家供大家参考。具体如下：
今天学习了下hibernate，写了个小的手工程序，总结下，
首先创建数据库表：
create table increment_testr(id bigint not null, name char(10), primary key(id));
eclipse下，新建工程。
新建数据库表的映射，这里使用手工方式完成：
IncrementTester.java


public class IncrementTester {
private Long id;
private String name;
public IncrementTester(){}
public IncrementTester(String name){
    this.name = name;
}
public Long getId(){
    return this.id;
}
private void setId(Long id){
    this.id = id;
}
public String getName(){
    return this.name;
}
public void setName(String name){
    this.name = name;
}
}
对应编写映射xml文件
IncrementTester.hbm.xml
PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"https://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
private
实现具体功能的类BussinessService

import java.lang.reflect.*;
import org.hibernate.*;
import org.hibernate.cfg.*;
import java.io.*;
import java.sql.*;
import java.util.*;
public class BussinessService {
public static SessionFactory sessionFactory;
static{
    try{
      Configuration config = new Configuration().configure();
      sessionFactory = config.buildSessionFactory();
    }catch(Exception e){
      e.printStackTrace();
    }
}
public void findAllObjects(String className){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try{
      tx = session.beginTransaction();
      List objects = session.createQuery("from "+className).list();
      for(Iterator it = objects.iterator();it.hasNext();){
      Long id = new Long(0);
      IncrementTester xx = (IncrementTester)it.next();
      id=xx.getId();
      System.out.println("ID of "+className+":"+id+" name: "+xx.getName());
      }
      tx.commit();
    }catch(Exception e){
      e.printStackTrace();
    }finally{
      session.close();
    }
}
public void saveObject(Object object){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try{
      tx = session.beginTransaction();
      session.save(object);
      tx.commit();
    }catch(Exception e){
      e.printStackTrace();
      if(tx != null){
      tx.rollback();
      }
    }finally{
      session.close();
    }
}
public void deleteAllObject(String className){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try{
      tx = session.beginTransaction();
      Query query=session.createQuery("delete from "+className);
      query.executeUpdate();
      tx.commit();
    }catch(Exception e){
      e.printStackTrace();
      if(tx!=null){
      tx.rollback();
      }
    }finally{
      session.close();
    }
}
}

实现主函数：


public class test {
/**
   * @param args
   */
public static void main(String[] args) {
    // TODO Auto-generated method stub
    String name="IncrementTester";
    BussinessService aa = new BussinessService();
    aa.deleteAllObject(name);
    Object o1 = null;
    try {
      o1 = Class.forName(name).newInstance();
      ((IncrementTester)o1).setName("caijie");
      aa.saveObject(o1);
      o1 = Class.forName(name).newInstance();
      ((IncrementTester)o1).setName("gufeng");
      aa.saveObject(o1);
    } catch (Exception e) {
      e.printStackTrace();
    }
    aa.findAllObjects(name);
}
}
hibernate配置文件：hibernate.cfg.xml

PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"https://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
org.hibernate.dialect.MySQLDialect
com.mysql.jdbc.Driver
jdbc:mysql://localhost:3306/test
root
root
true
增加相应的库，运行后成功得到结果：


Hibernate: delete from INCREMENT_TESTR
Hibernate: select max(ID) from INCREMENT_TESTR
Hibernate: insert into INCREMENT_TESTR (NAME, ID) values (?, ?)
Hibernate: insert into INCREMENT_TESTR (NAME, ID) values (?, ?)
Hibernate: select incrementt0_.ID as ID0_, incrementt0_.NAME as NAME0_ from INCREMENT_TESTR incrementt0_
ID of IncrementTester:1 name: caijie
ID of IncrementTester:2 name: gufeng
希望本文所述对大家的JSP程序设计有所帮助。

https://www.uoften.com/program/jsp/20180413/47845.html

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