MyBatis02-解决多个参数处理及传参方式

按照原始思路：

//用number和name查询
    public User SelectUser02(int number, String name);

        select * from stu where number=#{number} and name=#{name}
     
@Test
    public void Test02() throws IOException {
        String resource = "Mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        UserInterface mapper = sqlSession.getMapper(UserInterface.class);
        System.out.println(mapper.SelectUser02(103, "罗振声"));

    }
 
结果：报以下错误
 
 解决方式：使用@Param注解
 
public User SelectUser02(@Param("number") int number, @Param("name") String name);
 
2.传参方式 
（1）map集合 
编写接口用HashMap接收参数
 
public User SelectUser03(HashMap map);
 
编写SQL
 

        select * from stu where number=#{number} and name=#{name}
    

测试类

    @Test
    public void Test03() throws IOException {
        String resource = "Mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        UserInterface mapper = sqlSession.getMapper(UserInterface.class);
        HashMap map = new HashMap<>();
        map.put("number",101);
        map.put("name","罗振声");
        System.out.println(mapper.SelectUser03(map));

可以用普通传参，看具体需要什么就给什么，也可以用实体类传参（直接给个对象），如果某个需求经常用模型里没有的参数也可以考虑用DTO传参