diff --git a/electrmangnetic/src/main/resources/sqlmapper/EdFileInfoMapper.xml b/electrmangnetic/src/main/resources/sqlmapper/EdFileInfoMapper.xml
index 88632fe..b1aadb0 100644
--- a/electrmangnetic/src/main/resources/sqlmapper/EdFileInfoMapper.xml
+++ b/electrmangnetic/src/main/resources/sqlmapper/EdFileInfoMapper.xml
@@ -26,7 +26,7 @@
     <select id="maxPrjId" resultType="java.lang.String">
         select max(id)
         from ed_file_info
-        where len(prj_dir) = 6
+        where length(id) = 6
     </select>
 
     <select id="queryFileList" resultMap="FileInfoResultMap" >