Spring4整合Hibernate5详细步骤

Spring与Hiberante整合

通过hibernate的学习，我们知道，hibernate主要在hibernate.cfg.xml配置文件中

接下来我们看一下hibernate的一个配置文件

hibernate配置文件

hibernate.cfg.xml

  
    
    com.mysql.jdbc.Driver
    
    jdbc:mysql://localhost/hibernate_test
    
    root
    
    cheng
    
    20
    
    1
    
    5000
    
    100
    3000
    2
    true
    
    org.hibernate.dialect.MySQL5InnoDBDialect
    
    update
    
    true
    
    true
    
    false
    
    
    
  

配置文件的作用

hibernate.cfg.xml文件的主要作用就是配置了一个session-factory

1. 在session-factory中主要通过property配置一些数据库的连接信息，我们知道，spring通常会将这种数据库连接用dataSource来表示，这样一来，hibernate.cfg.xml文件中的所有跟数据库连接的都可以干掉了，直接用spring的dataSource，而dataSource也可以用c3p0、dbcp等。
2. 在session-factory中通过property除了配置一些数据库的连接信息之外，还有一些hibernate的配置，比如方言、自动创建表机制、格式化sql等，这些信息也需要配置起来。
3. 还有最关键的一个持久化类所在路径的配置

当不采用spring整合的时候，我们使用hibernate时主要是用hibernate从sessionFactory中去的session，然后用session来操作持久化对象，而sessionFactory来自于配置文件。像下面这样：

  StandardServiceRegistry registry = null;
  SessionFactory sessionFactory = null;
  Session session = null;
  Transaction transaction = null;
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

  @Before
  public void init() {

    registry = new StandardServiceRegistryBuilder()
        .configure() // configures settings from hibernate.cfg.xml
        .build();
    sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory();
    session = sessionFactory.openSession();
    //开始事务
    transaction = session.getTransaction();
    transaction.begin();
  }

  @Test
  public void testSaveUser() {
    User user = new User();
    user.setUsername("张学友");
    user.setPassword("jacky");
    user.setRegistDate(sdf.format(new Date()));
    File file = new File("D:"+File.separator+"ubuntu.png");
    String fileName = file.getName();
    String prefix=fileName.substring(fileName.lastIndexOf(".")+1);
    System.out.println(prefix);
    InputStream input = null;
    try {
      input = new FileInputStream(file);

    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }

    Blob image = null;
    try {
      image = Hibernate.getLobCreator(session).createBlob(input,input.available());
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    user.setUserPic(image);
    session.save(user);
  }

  @After 
  public void destroy(){
    transaction.commit();
    session.close();
    sessionFactory.close();
    StandardServiceRegistryBuilder.destroy( registry );
  }

Spring对hibernate的整合就是将上述三点通过spring配置起来，而hibernate最关键的sessionFactroy就是spring的一个bean

这些理解了整合就简单了，

SessionFactoryBean

spring的sessionFactroy像下面这样配置：

  

  
    
    
      
        
        com.wechat.entity.po
      
    
    
      
        ${hibernate.hbm2ddl.auto}
        ${hibernate.dialect}
        ${hibernate.show_sql}
        ${hibernate.format_sql}
        false
      
    
  

通过bean的配置可以看出该bean就是hibernate的sessionFactroy

因为它指向了org.springframework.orm.hibernate5.LocalSessionFactoryBean

在这个bean中主要配置了上面说的三点：

1. 数据源dataSource
2. hibernate的配置，包括方言，输出sql等
3. 持久化类的位置，通过包进行扫描

下面给出数据源dataSource的配置

dataSource

还有数据库的连接信息

jdbc.properties

#-----------------------------------------------------
# 数据库配置
#-----------------------------------------------------
#服务器地址
host=127.0.0.1
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://${host}:3306/hibernate_test
jdbc.username=root
jdbc.password=cheng

#-----------------------------------------------------
# 适用于c3p0的配置
#-----------------------------------------------------
#-----------------------------------------------------
# c3p0反空闲设置，防止8小时失效问题28800
#-----------------------------------------------------
#idleConnectionTestPeriod要小于MySQL的wait_timeout
jdbc.c3p0.testConnectionOnCheckout=false
jdbc.c3p0.testConnectionOnCheckin=true
jdbc.c3p0.idleConnectionTestPeriod=3600
#-----------------------------------------------------
# c3p0连接池配置
#-----------------------------------------------------
#initialPoolSize, minPoolSize, maxPoolSize define the number of Connections that will be pooled.
#Please ensure that minPoolSize <= maxPoolSize.
#Unreasonable values of initialPoolSize will be ignored, and minPoolSize will be used instead.
jdbc.c3p0.initialPoolSize=10
jdbc.c3p0.minPoolSize=10
jdbc.c3p0.maxPoolSize=100
#maxIdleTime defines how many seconds a Connection should be permitted to go unused before being culled from the pool.
jdbc.c3p0.maxIdleTime=3600
#-----------------------------------------------------
# hibernate连接池配置
#-----------------------------------------------------
hibernate.connection.driverClass=com.mysql.jdbc.Driver
hibernate.connection.url=jdbc:mysql://${host}:3306/${dbName}
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.show_sql=true
hibernate.format_sql=true
hibernate.hbm2ddl.auto=update

配置完这些还有spring强大的事务管理

好了，这些配置好之后就可以使用在spring中配置的sessionFactroy了

UserDao

package com.wechat.dao;

import java.util.List;

import com.wechat.entity.po.User;

public interface UserDao {
  // 得到所有用户
  public List getAllUser();

  // 检测用户名是否存在
  public boolean isExists(String username);

}

实现类

package com.wechat.dao.impl;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.wechat.dao.UserDao;
import com.wechat.entity.po.User;
@Repository
public class UserDaoImpl implements UserDao {
  //注入sessionFactory
  @Autowired
  private SessionFactory sessionFactory;

  @SuppressWarnings("unchecked")
  @Override
  public List getAllUser() {
    List userList = new ArrayList();
    String hsql="from User";
    Session session = sessionFactory.getCurrentSession();
    Query query = session.createQuery(hsql);
    userList = query.list();
    return userList;
  }

  @Override
  public boolean isExists(String username) {
    Query query = sessionFactory.openSession()
        .createQuery("from User u where u.username = :username").setParameter("username", username);
    System.out.println(query.list().size());
    return query.list().size()>0?true:false;
  }

}

UserService

package com.wechat.service.user;

import java.util.List;

import com.wechat.entity.po.User;

public interface UserService {
  public List getAllUser();
  public boolean isExists(String username);

}

实现类

package com.wechat.service.user.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import com.wechat.dao.UserDao;
import com.wechat.entity.po.User;
import com.wechat.service.user.UserService;
@Service
public class UserServiceImpl implements UserService {
  @Autowired
  private UserDao userDao;
  @Override
  public List getAllUser() {
    return userDao.getAllUser();
  }
  @Override
  @Cacheable(cacheNames="isExists", key="#username")
  public boolean isExists(String username) {
    return userDao.isExists(username);
  }

}

因为事务管理是配置在service层，所以用service来测试

测试

package com.wechat.dao;

import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.wechat.entity.po.User;
import com.wechat.service.user.UserService;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:spring/spring-core.xml" })
public class UserServiceTest {
  @Autowired
  private UserService userService;

  @Test
  public void test() {
    List userList = userService.getAllUser();
    for(User user:userList){
      System.out.println(user.getUsername());
    }

  }

}

输入结果

Hibernate: 
  select
    user0_.userid as userid1_2_,
    user0_.password as password2_2_,
    user0_.registDate as registDa3_2_,
    user0_.userPic as userPic4_2_,
    user0_.username as username5_2_ 
  from
    user_info user0_
程高伟
张学友

数据库表

好了Spring整合hibernate就写到这里。

项目地址：https://github.com/peer44/testwechat

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。