添加公共统计接口

client-api/src/main/java/org/jiayunet/pojo/dto/recruitAnnouncement/RecruitAnnouncementStatisticsDto.java

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+package org.jiayunet.pojo.dto.recruitAnnouncement;
+
+import lombok.Data;
+
+/**
+ * 招聘公告统计返回
+ *
+ * @author zk
+ */
+@Data
+public class RecruitAnnouncementStatisticsDto {
+
+    /** 今日新增公告数 */
+    private Long dayCount;
+
+    /** 本月新增公告数 */
+    private Long monthCount;
+
+    /** 累计公告数 */
+    private Long totalCount;
+}

manager/src/main/java/org/jiayunet/pojo/vo/RecruitAnnouncementStatisticsVo.java

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+package org.jiayunet.pojo.vo;
+
+import lombok.Data;
+
+/**
+ * 招聘公告统计VO（SQL查询结果）
+ *
+ * @author zk
+ */
+@Data
+public class RecruitAnnouncementStatisticsVo {
+
+    /** 今日新增公告数 */
+    private Long dayCount;
+
+    /** 本月新增公告数 */
+    private Long monthCount;
+
+    /** 累计公告数 */
+    private Long totalCount;
+}

manager/src/main/resources/mapper/RecruitAnnouncementMapper.xml

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+<?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="org.jiayunet.mapper.RecruitAnnouncementMapper">
+
+    <resultMap id="RecruitAnnouncementStatisticsVoMap" type="org.jiayunet.pojo.vo.RecruitAnnouncementStatisticsVo">
+        <result column="day_count" property="dayCount"/>
+        <result column="month_count" property="monthCount"/>
+        <result column="total_count" property="totalCount"/>
+    </resultMap>
+
+    <!-- 查询最后更新时间：按id倒序取第一条的创建时间 -->
+    <select id="selectLastCreateTime" resultType="java.time.Instant">
+        SELECT create_time
+        FROM bg_recruit_announcement
+        ORDER BY id DESC
+        LIMIT 1
+    </select>
+
+    <!-- 统计公告数量：一次扫描算出日/月/累计三个计数，保证三个数字来自同一快照 -->
+    <select id="selectStatistics" resultMap="RecruitAnnouncementStatisticsVoMap">
+        SELECT
+            IFNULL(SUM(create_time <![CDATA[>=]]> #{dayStart}), 0)   AS day_count,
+            IFNULL(SUM(create_time <![CDATA[>=]]> #{monthStart}), 0) AS month_count,
+            COUNT(*)                                                AS total_count
+        FROM bg_recruit_announcement
+    </select>
+
+</mapper>