添加sn参数

src/main/java/com/lm/lib/controller/ShowDataController.java

@@ -70,7 +70,7 @@ public class ShowDataController {
     private Map<String, Object> getSnList(String fid, String sid) {
         String sql = "select qrcode from py_battery where f_id=" + fid;
         if (null != sid) {
-            sql.concat(" and s_id=" + sid);
+            sql = sql.concat(" and s_id=" + sid);
         }
         List<Map<String, Object>> snData = moyuJdbcTemplate.queryForList(sql);
         List<String> snList = new ArrayList();