问题修改

src/main/resources/mapper/MaterialClassMapper.xml

@@ -9,8 +9,7 @@
             a.storage_location_code,
             b.storage_location_name as storageLocationName,
             c.name as wllbName,
-            a.id,
-            c.code as wllbCode
+            a.id
        from tld_material_class a
        left join tld_storage_location b on a.storage_location_code = b.storage_location_code
        left join tld_material c on a.wllb_code = c.tld_id