添加公共统计接口

manager/src/main/java/org/jiayunet/mapper/RecruitAnnouncementMapper.java

@@ -1,13 +1,32 @@
 package org.jiayunet.mapper;
 
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
 import org.jiayunet.pojo.po.RecruitAnnouncement;
+import org.jiayunet.pojo.vo.RecruitAnnouncementStatisticsVo;
+
+import java.time.Instant;
 
 /**
- * 招聘公告Mapper
+ * 招聘公告主表Mapper
  *
  * @author zk
  */
 @Mapper
 public interface RecruitAnnouncementMapper extends CommonMapper<RecruitAnnouncement> {
+
+    /**
+     * 查询最后更新时间
+     * <p>按id倒序取第一条的创建时间</p>
+     */
+    Instant selectLastCreateTime();
+
+    /**
+     * 统计公告数量（日/月/累计）
+     * <p>一次扫描算三个计数，保证三个数字来自同一快照；无数据时计数为0</p>
+     *
+     * @param dayStart   今日开始时间
+     * @param monthStart 本月开始时间
+     */
+    RecruitAnnouncementStatisticsVo selectStatistics(@Param("dayStart") Instant dayStart, @Param("monthStart") Instant monthStart);
 }