【MyBatis框架】mybatis和spring整合

Posted on by hackdl

spring和mybatis整合

1.整合思路

需要spring通过单例方式管理SqlSessionFactory。

spring和mybatis整合生成代理对象，使用SqlSessionFactory创建SqlSession。（spring和mybatis整合自动完成）

持久层的mapper都需要由spring进行管理。

2.整合环境

创建一个新的java工程（接近实际开发的工程结构）

jar包：

mybatis3.2.7的jar包

spring3.2.0的jar包

mybatis和spring的整合包：早期ibatis和spring整合是由spring官方提供，mybatis和spring整合由mybatis提供。jar包名mybatis-spring-1.2.2.jar

下面加入MyBatis与Spring整合的全部jar包

如图

工程结构：

如图

3.sqlSessionFactory

在applicationContext.xml配置sqlSessionFactory和数据源

sqlSessionFactory在mybatis和spring的整合包下。


  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
    http://www.springframework.org/schema/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.2.xsd 
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">


  
  


  
      destroy-method="close">

4.原始dao开发（和spring整合后）

4.1User.xml


PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

在SqlMapconfig.xml中加载User.xml

4.2dao(实现类继承SqlSessionDaoSupport)

dao接口实现类需要注入SqlSessoinFactory，通过spring进行注入。

这里spring声明配置方式，配置dao的bean：

让UserDaoImpl实现类继承SqlSessionDaoSupport

4.3配置dao

首先创建UserDao接口和UserDaoImpl接口实现

UserDao.java:

package cn.edu.hpu.ssm.dao;

import cn.edu.hpu.ssm.po.User;

//用户管理的Dao接口
public interface UserDao{
  
  //根据Id查询用户信息
  public User findUserById(int id) throws Exception;
}

UserDaoImpl.java:

package cn.edu.hpu.ssm.dao;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import cn.edu.hpu.ssm.po.User;

public class UserDaoImpl implements UserDao{


  //需要向dao实现类中注入SqlSessionFactory工厂
  //这里我们暂时没用spring，我们通过构造方法注入
  private SqlSessionFactory sqlSessionFactory;
  public UserDaoImpl(SqlSessionFactory sqlSessionFactory){
    this.sqlSessionFactory=sqlSessionFactory;
  }


  public User findUserById(int id) throws Exception {
    SqlSession sqlSession=sqlSessionFactory.openSession();
    
    User user=sqlSession.selectOne("test.findUserById",id);
    
    //释放资源
    sqlSession.close();
    return user;
  }
}

在applicationContext.xml中配置dao。


  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
    http://www.springframework.org/schema/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.2.xsd 
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">


  
  


  
      destroy-method="close">

让UserDaoImpl去继承SqlSessionDaoSupport类，在SqlSessionDaoSupport类中提供了set和getsqlSessionFactory的方法。

package cn.edu.hpu.ssm.dao;

import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;


import cn.edu.hpu.ssm.po.User;


public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao{


  public User findUserById(int id) throws Exception {
    //继承SqlSessionDaoSupport类，通过this.getSqlSession()得到sqlSession
    SqlSession sqlSession=this.getSqlSession();
    
    User user=sqlSession.selectOne("test.findUserById",id);
    
    return user;
  }
}

4.4测试程序

package cn.edu.hpu.ssm.test;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


import cn.edu.hpu.ssm.dao.UserDao;
import cn.edu.hpu.ssm.po.User;


public class UserDaoImplTest {
  
  private ApplicationContext applicationContext;
  
  //注解Before是在执行本类所有测试方法之前先调用这个方法
  @Before
  public void setup() throws Exception{
    applicationContext=new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");
    
  }
  
  @Test
  public void testFindUserById() throws Exception{
    UserDao userDao=(UserDao)applicationContext.getBean("userDao");
    
    //调用UserDao的方法
    User user=userDao.findUserById(1);
    //输出用户信息
    System.out.println(user.getId()+":"+user.getUsername());
  }
  
}

测试结果和输出日志:

DEBUG [main] - Creating a new SqlSession
DEBUG [main] - SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@8dcd5d] was not registered for synchronization because synchronization is not active
DEBUG [main] - Fetching JDBC Connection from DataSource
DEBUG [main] - JDBC Connection [jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8, UserName=root@localhost, MySQL-AB JDBC Driver] will not be managed by Spring
DEBUG [main] - ==> Preparing: SELECT * FROM USER WHERE id=? 
DEBUG [main] - ==> Parameters: 1(Integer)
DEBUG [main] - DEBUG [main] - Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@8dcd5d]
DEBUG [main] - Returning JDBC Connection to DataSource
1:张明明

5.mapper代理开发

5.1mapper.xml和mapper.java

UserMapper.xml:


PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

UserMapper.java:

package cn.edu.hpu.ssm.mapper;

import cn.edu.hpu.ssm.po.User;

//用户管理的Dao接口
public interface UserMapper {
  
  //根据Id查询用户信息
  public User findUserById(int id) throws Exception;
}

5.2通过MapperFactoryBean创建代理对象

此方法问题：

需要针对每个mapper进行配置，麻烦。所以要通过MapperScannerConfigurer进行mapper扫描。

5.3通过MapperScannerConfigurer进行mapper扫描（建议使用）

sqlMapperConfig.xml中的mapper扫描就可以不要了

5.4测试代码

package cn.edu.hpu.ssm.test;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


import cn.edu.hpu.ssm.mapper.UserMapper;
import cn.edu.hpu.ssm.po.User;


public class UserMapperTest {


private ApplicationContext applicationContext;
  
  //注解Before是在执行本类所有测试方法之前先调用这个方法
  @Before
  public void setup() throws Exception{
    applicationContext=new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");
    
  }
  
  @Test
  public void testFindUserById() throws Exception {
    UserMapper userMapper=(UserMapper)applicationContext.getBean("userMapper");
    User user=userMapper.findUserById(1);
    System.out.println(user.getId()+":"+user.getUsername());
    
  }


}

测试结果及输出日志：

DEBUG [main] - Returning cached instance of singleton bean 'userMapper'
DEBUG [main] - Creating a new SqlSession
DEBUG [main] - SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@13b5a3a] was not registered for synchronization because synchronization is not active
DEBUG [main] - Fetching JDBC Connection from DataSource
DEBUG [main] - JDBC Connection [jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8, UserName=root@localhost, MySQL-AB JDBC Driver] will not be managed by Spring
DEBUG [main] - ==>  Preparing: SELECT * FROM USER WHERE id=? 
DEBUG [main] - ==> Parameters: 1(Integer)
DEBUG [main] - DEBUG [main] - Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@13b5a3a]
DEBUG [main] - Returning JDBC Connection to DataSource
1:张明明

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