修复菜单为“目录”,perms字段保存为NULL编辑角色权限问题

ruoyi-system/src/main/resources/mapper/system/SysMenuMapper.xml

@@ -23,7 +23,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	</resultMap>
 	
 	<sql id="selectMenuVo">
-        select menu_id, menu_name, parent_id, order_num, url, menu_type, visible, perms, icon, create_by, create_time 
+        select menu_id, menu_name, parent_id, order_num, url, menu_type, visible, ifnull(perms,'') as perms, icon, create_by, create_time 
 		from sys_menu
     </sql>
     
@@ -58,7 +58,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	</select>
 	
 	<select id="selectMenuTree" parameterType="Long" resultType="String">
-		select concat(m.menu_id, m.perms) as perms
+		select concat(m.menu_id, ifnull(m.perms,'')) as perms
 		from sys_menu m
 			left join sys_role_menu rm on m.menu_id = rm.menu_id
 		where rm.role_id = #{roleId}