mybaits中每个实体对象都对应一个Mapper文件，因此在mapper中配置相关的增删改查语句

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="mapping.studentMapper">
    <!-- 指定查询SQL, parameterType是传入参数类型，resultType是返回结果-->
    <select id="getStudent" parameterType="int" resultType="dto.student">
        SELECT * FROM student WHERE id=#{id}
    </select>
    
    <!-- 添加 -->
    <insert id="addStudent" parameterType="dto.student">
        INSERT INTO student(name,code) VALUES (#{Name},#{Code})
    </insert>
     
    <!-- 删除 -->
    <delete id="delStudent" parameterType="java.lang.String">
        DELETE FROM student WHERE Code=#{_parameter}
    </delete>
     
    <!-- 修改 -->
    <update id="updateStudent" parameterType="dto.student">
        UPDATE student SET name=#{Name} WHERE Code=#{Code}
    </update>
     
    <!-- 查询全部 -->
    <select id="getList" resultType="dto.student">
        SELECT Id, Name, Code FROM student
    </select>
     
</mapper>

以上包括基本的增删改查和查询集合。其中parameterType是传入的参数类型，resultType是返回的结果类型，注意单个查询和查询所有结果，resultType的值是一样的

操作Mapper文件

@Controller
@RequestMapping("/Home")
public class HomeController {

    @Resource(name="applePhone")
    private IMobilePhone phone;
    
    @RequestMapping(value="index")
    public String Index()
    {
        String msg = phone.PhoneBrand();
        
        System.out.print(msg);
        
          String resource = "/conf.xml";
            //加载mybatis的配置文件
            InputStream inputstream =this.getClass().getResourceAsStream(resource);
           
            SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputstream);
          
            SqlSession session = sessionFactory.openSession();
           
            String statesql= "mapping.studentMapper.getStudent";    //在studentMapper.xml中有命名空间+方法名
            
            Student student= session.selectOne(statesql, 1);
            System.out.println(student.getName());
            
        return "index";
    }

    @RequestMapping(value="AddStudent")
    public String AddStudent()
    {
            String resource = "/conf.xml";
            //加载mybatis的配置文件
            InputStream inputstream =this.getClass().getResourceAsStream(resource);
           
            SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputstream);
          
            SqlSession session = sessionFactory.openSession();
           
            String statesql= "mapping.studentMapper.addStudent";//在studentMapper.xml中有命名空间+方法名
            Student student=new Student();
            student.setName("PG ONE");
            student.setCode("三年二班");
            int result = session.insert(statesql,student);
            session.commit();
            session.close();
            System.out.println(result);
            return "index";
    }
    
    
    @RequestMapping(value="Delstudent")
    public String Delstudent()
    {
            String resource = "/conf.xml";
            //加载mybatis的配置文件
            InputStream inputstream =this.getClass().getResourceAsStream(resource);
           
            SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputstream);
          
            SqlSession session = sessionFactory.openSession();
           
            String statesql= "mapping.studentMapper.delStudent";//在studentMapper.xml中有命名空间+方法名
            
            int result = session.delete(statesql,"00002");
            session.commit();
            session.close();
            System.out.println(result);
            return "index";
    }
    
    @RequestMapping(value="Updatestudent")
    public String Updatestudent()
    {
            String resource = "/conf.xml";
            //加载mybatis的配置文件
            InputStream inputstream =this.getClass().getResourceAsStream(resource);
           
            SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputstream);
          
            SqlSession session = sessionFactory.openSession();
           
            String statesql= "mapping.studentMapper.updateStudent";//在studentMapper.xml中有命名空间+方法名
            
            student student=new student();
            student.setName("GAI");
            student.setCode("00002");
            
            
            int result = session.update(statesql, student);
            session.commit();
            session.close();
            System.out.println(result);
            return "index";
    }
    
    
    @RequestMapping(value="List")
    public String List()
    {
            String resource = "/conf.xml";
            //加载mybatis的配置文件
            InputStream inputstream =this.getClass().getResourceAsStream(resource);
           
            SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputstream);
          
            SqlSession session = sessionFactory.openSession();
           
            String statesql= "mapping.studentMapper.getList";    //在studentMapper.xml中有命名空间+方法名
            
           
            java.util.List<student> listResult= session.selectList(statesql);
            session.commit();
            session.close();
            
            for(dto.student item:listResult)
            {
                   System.out.print(item.getId()+"--"+item.getCode()+"--"+item.getName());
                    System.out.print("--------------");
            }
           
            return "index";
    }
    
    
    
    
}