update

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

@@ -867,7 +867,7 @@
         WHERE su.id_ IS NOT NULL
     </select>
 
-	<update id="batchUpdateStudentNumMinusOne">
+	<update id="batchUpdateStudentNumMinusOne" parameterType="java.util.List">
 		update class_group set student_num_ = (student_num_ - 1),update_time_ = now() where id_ IN
       <foreach collection="classGroupIds" item="classGroupId" open="(" close=")" separator=",">
           #{classGroupId}