关于mybatis:map

假如，咱们的实体类，或者数据库中的表，字段或者参数过多，咱们该当应用Map！

User addUser(Map<String,Object> map);

<!--对象的属性，能够间接取出来传递map的key--><insert id="addUser" parameterType="map">      insert into mybatis.user(id,name,pwd) values (#{userId},#{userName},#{password});</insert>

测试

@Testpublic void addUser(){   SqlSession sqlSession = MybatisUtils.getSqlSession();   UserDao mapper = sqlSession.getMapper(UserDao.class);      Map<String,Object> map = new HashMap<String,Object>();      map.put("userId",5);   map.put("password","123789");      mapper.addUser(map);      sqlSession.close();}

map传递参数，间接在sql中取出map中的key即可！
对象传递参数，间接在sql中取对象的属性即可！
只有一个根本类型参数的状况下，能够间接在sql中取到！

List<User> getUserLike(String value);

<select id="getUserLike" resultType="com.jialidun.pojo.User">    select * from mybatis.user where name like "%" #{value} "%"/select>

@Testpublic void getUserLike(){    SqlSession sqlSession = MybatisUtils.getSqlSession();   UserDao mapper = sqlSession.getMapper(UserDao.class);      List<User> userList = mapper.getUserLike("孙");      for(User user:userList){        System.out.println(user);   }      sqlSession.close();}