add 乐保历史数据处理

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

@@ -188,6 +188,8 @@
         WHERE student_id_ = #{studentId}
           AND goods_id_ = #{goodsId}
           AND del_flag_ = 0
+        ORDER BY id_ DESC
+        LIMIT 1
     </select>
 
     <select id="getOldStudentInstrument" resultMap="StudentInstrument">