MyBatis 使用注解方式实现一对多

//学生po
public class Student {
     
     //学生id 主键      
     private Long id;
     
     //学生姓名  
     private String name;

　　　//getter and setter ...
 
}

//老师po
public class Teacher {
     
     //老师id 主键      
     private Long id;
     
     //老师姓名  
     private String name;
　　　//getter and setter ...
}

//老师 vo
public class TeacherVO extends Teacher {

    //学生list 因为 教师：学生 = 1 : n
    private List<Student> students;

　　// getter and setter ...

}

//关系表po
public class Relation {

    /* 主键 */
    private Long id;

    /* 学生id */
    private Long sid;

    /* 教师id */
    private Long tid;
    
    // getter and setter ...
}

//关系表 Mapper接口
public interface RelationMapper {
@Select("select id,name from TEACHER")
@Results({@Result(property = "id",column = "id"),
        @Result(property = "name",column = "name"),
        @Result(property = "students",javaType = List.class,column ="id",
                many = @Many(select = "com.example.mapper.RelationMapper.findStudents"))})
List<TeacherVo> findTeacherAndStudents();

@Select("select s.name from RELATION r,STUDENT s where s.id = r.sid and r.tid = #{tid}")
List<Student> findStudents(Long tid);

}

@Select("select id,name from TEACHER")中的id 通过 @Result(property = "students",javaType = List.class,column ="id",传到 many = @Many(select = "com.example.mapper.RelationMapper.findStudents"))})
在 List findStudents(Long tid) 中接到传递过来的id 并赋值给sql语句中 #{tid}
这样就完成了，老师学生通过关系表完成1对多。
在对应的实现类中，实现findTeacherAndStudents()方法即可，控制层同理~

layui对后台传来的的roles集合进行遍历展示职位：
userlimit.html部分代码
{field: 'id', title: '序号', sort: true, fixed: 'left'}
, {field: 'no', title: '工号'}
, {field: 'name', title: '姓名', sort: true}
, {field: 'roles', title: '职位', sort: true, templet:function(info){
    var rlist = info.roles;
    var infos = "";
    for(var i = 0; i < rlist.length; i++){
        infos = infos + " "+rlist[i].info;
    }
    return infos;
    }}