diff --git a/LI b/LI
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+package com.qsd.orange.service;
+
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.qsd.orange.po.SysAnnouncement;
+
+public interface AnnouncementService {
+
+    //查询全部公告
+    IPage<SysAnnouncement> all(Integer page, Integer limit);
+    //新增一条公告
+    int add(SysAnnouncement announcement, String username);
+    //更新一条公告
+    int update(SysAnnouncement announcement);
+
+}