feat: 完善仪表盘公告区块内容

continew-admin-system/src/main/resources/mapper/AnnouncementMapper.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
+<mapper namespace="top.charles7c.cnadmin.system.mapper.AnnouncementMapper">
+
+    <select id="selectDashboardList"
+            resultType="top.charles7c.cnadmin.system.model.vo.AnnouncementDashboardVO">
+        SELECT
+            `id`, `title`, `type`
+        FROM `sys_announcement`
+        WHERE (`effective_time` IS NULL OR NOW() > `effective_time`)
+          AND (`terminate_time` IS NULL OR `terminate_time` > NOW())
+        ORDER BY `sort` ASC, `effective_time` DESC
+        LIMIT 5
+    </select>
+</mapper>