1、添加教务老师字段

2、布置作业

mec-biz/src/main/resources/config/mybatis/CoursesGroupMapper.xml

@@ -35,7 +35,7 @@
 	</select>
 
 	<select id="lockGroup" resultMap="CoursesGroup" >
-		SELECT * FROM courses_group WHERE id_ = #{groupId}
+		SELECT * FROM courses_group WHERE id_ = #{groupId} FOR UPDATE
 	</select>
 	
 	<!-- 全查询 -->