Spring-12-spring整合Mybatis

12. 整合Mybatis

步骤：

1. 导入相关jar包
   • junit
   • mybatis
   • mysql数据库
   • spring相关的
   • aop织入
   • mybatis-spring【新知识点】

    
        junit
        junit
        4.12
    
    
        mysql
        mysql-connector-java
        5.1.47
    
    
        org.mybatis
        mybatis
        3.5.2
    
    
        org.springframework
        spring-webmvc
        5.1.9.RELEASE
    
    
    
    
        org.springframework
        spring-jdbc
        5.1.9.RELEASE
    
    
        org.aspectj
        aspectjweaver
        1.8.13
    
    
    
        org.mybatis
        mybatis-spring
        2.0.2
    
    

    org.projectlombok
    lombok
    1.16.10
    provided

 

2. 编写配置文件

3. 测试

12.1 回忆Mybatis

1. 编写实体类

@Data
public class User {
    private int id;
    private String name;
    private String pwd;
}

2. 编写核心配置类

db.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=UTF-8
username=huba
password=123456

3. 编写接口

public interface UserMapper {
    public List selectUser();
}

4. 编写mapper.xml

    
        select * from mybatis.user;
    

5. 测试

@Test
public void test1() throws IOException {
    String resource="mybatis-config.xml";
    InputStream inputStream = Resources.getResourceAsStream(resource);
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    SqlSession sqlSession = sqlSessionFactory.openSession();

    UserMapper mapper = sqlSession.getMapper(UserMapper.class);
    List userList = mapper.selectUser();

    for (User user : userList) {
        System.out.println(user);
    }
}

解决资源过滤问题：（pom.xml）

    
        
            src/main/java
            
                **/*.properties
                **/*.xml
            
            false
        
        
            src/main/resources
            
                **/*.properties
                **/*.xml
            
            false
        
    

12.2 Mybatis-Spring

整合方式一：SqlSessionTemplate

1. 编写数据源配置

2. sqlSessionFactory

3. sqlSessionTemplate

4. 需要给接口加实现类

   public class UserMapperImpl implements UserMapper{
   
       //以前，所有的操作都使用sqlSession来执行；现在，由sqlSessionTemplate执行
       private SqlSessionTemplate sqlSession;
   
       public void setSqlSession(SqlSessionTemplate sqlSession) {
           this.sqlSession = sqlSession;
       }
   
       public List selectUser() {
           UserMapper mapper = sqlSession.getMapper(UserMapper.class);
           return mapper.selectUser();
   
       }
   }
   

5. 将实现类注入到spring中

6. 测试使用即可

   @Test
   public void test2(){
       ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
       UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
       List users = userMapper.selectUser();
       for (User user : users) {
           System.out.println(user);
       }
   }
   

整合方式二： SqlSessionDaoSupport

SqlSessionDaoSupport是一个抽象的支持类，可以调用getSqlSession()得到一个SqlSessionTemplate。

实现类（继承DaoSupport）：

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper{
    public List selectUser() {
        /*SqlSession sqlSession = getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.selectUser();*/
        return getSqlSession().getMapper(UserMapper.class).selectUser();
    }
}

配置bean（只需要注入sqlSessionFactory）：