fix

zhongzheng-system/src/main/java/com/zhongzheng/modules/order/domain/OrderBusinessConfig.java

@@ -41,5 +41,5 @@ private static final long serialVersionUID=1L;
     /** 班级类型 1基础班 2强化班 3私塾班 */
     private Integer gradeType;
     /** 主图上传*/
-    private Integer mainImg;
+    private String mainImg;
 }