Mybatis一对多标签Collection的使用和接收多参数的用法

CurriculumDao.xml 部分如下：

   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

1. collection中的property对应实体类CurriculumEntity的属性

private List classes;

2. column用于接收参数

    2.1. 接收一个参数，示例：collection标签中的column="id"

    2.2. 接收多参数，示例：collection标签中的 column="{curriculumId = curriculumId, teacherId = teacherId}"

    CurriculumDao.xml 中方法示例：

   select
      cu.*, cu.id as curriculumId,
      t.`name` as teacherName, t.id as teacherId
   from lr_database_curriculum cu
      left join lr_database_curriculum_class dcc on dcc.curriculum_id = cu.id
      left join lr_database_teacher t on dcc.teacher_id = t.id
   
      
         cu.name like concat('%',#{key},'%')
      
      
         and t.id = #{userId}
      
      
         and cu.id = #{curriculumId}
      
   
   group by cu.id
 
上述红色部分相对应，绿色部分对应collection标签中select属性中CurriculumClassDao中的getClassesById方法的参数，如下：
      resultMap="cn.longrace.wisdom.modules.dataBase.dao.ClassDao.classMap"    parameterType="cn.longrace.wisdom.modules.dataBase.entity.CurriculumClassEntity">
   select
   cl.* , count(lds.id) as studentNums, cc.teacher_id as teacherId
   from lr_database_class cl
   left join lr_database_curriculum_class cc on cl.id = cc.class_id
   left join lr_database_student lds on lds.class_id = cl.id
   where cc.curriculum_id = #{curriculumId}
   
      and cc.teacher_id = #{teacherId}
   
   group by cl.id