refactor(archive-service): 重构员工会话存档统计逻辑，优化查询性能

1. 新增StaffMapper分页查询与计数方法，替换原MyBatis-Plus分页写法
2. 新增批量统计方法，合并多轮单员工查询为批量SQL查询
3. 重构员工列表查询逻辑，减少数据库交互次数
4. 拆分基础VO转换与统计填充方法，优化代码结构

backend/archive-service/src/main/java/com/artedu/archive/mapper/ArchiveMessageMapper.java

@@ -106,6 +106,21 @@ public interface ArchiveMessageMapper extends BaseMapper<ArchiveMessage> {
     @Select("SELECT DISTINCT from_user FROM archive_messages WHERE corp_id = #{corpId} AND from_role = 'INTERNAL'")
     List<String> selectStaffIdsWithArchive(@Param("corpId") String corpId);
 
+    @Select("<script>" +
+            "SELECT from_user AS staff_id, COUNT(*) AS msg_count, " +
+            "SUM(CASE WHEN msgtime &gt;= UNIX_TIMESTAMP(CURDATE()) * 1000 " +
+            "         AND msgtime &lt; UNIX_TIMESTAMP(DATE_ADD(CURDATE(), INTERVAL 1 DAY)) * 1000 THEN 1 ELSE 0 END) AS today_msg_count, " +
+            "MAX(msgtime) AS last_msg_time " +
+            "FROM archive_messages " +
+            "WHERE corp_id = #{corpId} AND from_user IN " +
+            "<foreach collection='staffIds' item='id' open='(' separator=',' close=')'>" +
+            "#{id}" +
+            "</foreach> " +
+            "GROUP BY from_user" +
+            "</script>")
+    List<Map<String, Object>> selectStaffArchiveStats(@Param("corpId") String corpId,
+                                                      @Param("staffIds") List<String> staffIds);
+
     /**
      * 查询尚未上传到 COS 的媒体消息
      */

backend/archive-service/src/main/java/com/artedu/archive/mapper/CustomerMapper.java

@@ -6,6 +6,9 @@ import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Param;
 import org.apache.ibatis.annotations.Select;
 
+import java.util.List;
+import java.util.Map;
+
 /**
  * 客户数据访问层
  */
@@ -14,4 +17,17 @@ public interface CustomerMapper extends BaseMapper<Customer> {
 
     @Select("SELECT * FROM customers WHERE customer_id = #{customerId} AND corp_id = #{corpId} LIMIT 1")
     Customer selectByCustomerId(@Param("customerId") String customerId, @Param("corpId") String corpId);
+
+    @Select("<script>" +
+            "SELECT s.staff_id, COUNT(*) AS customer_count " +
+            "FROM customers c " +
+            "JOIN (" +
+            " <foreach collection='staffIds' item='id' separator=' UNION ALL '>" +
+            " SELECT #{id} AS staff_id" +
+            " </foreach>" +
+            ") s ON c.corp_id = #{corpId} AND JSON_CONTAINS(c.staff_ids, JSON_QUOTE(s.staff_id)) " +
+            "GROUP BY s.staff_id" +
+            "</script>")
+    List<Map<String, Object>> countCustomersByStaffIds(@Param("corpId") String corpId,
+                                                       @Param("staffIds") List<String> staffIds);
 }

backend/archive-service/src/main/java/com/artedu/archive/mapper/StaffMapper.java

@@ -6,9 +6,43 @@ import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Param;
 import org.apache.ibatis.annotations.Select;
 
+import java.util.List;
+
 @Mapper
 public interface StaffMapper extends BaseMapper<Staff> {
 
     @Select("SELECT * FROM staffs WHERE staff_id = #{staffId} AND corp_id = #{corpId} LIMIT 1")
     Staff selectByStaffId(@Param("staffId") String staffId, @Param("corpId") String corpId);
+
+    @Select("<script>" +
+            "SELECT s.* FROM staffs s " +
+            "WHERE s.corp_id = #{corpId} " +
+            "<if test='keyword != null and keyword != \"\"'>" +
+            " AND (s.staff_id LIKE CONCAT('%', #{keyword}, '%') OR s.name LIKE CONCAT('%', #{keyword}, '%')) " +
+            "</if>" +
+            "<if test='hasArchive'>" +
+            " AND EXISTS (SELECT 1 FROM archive_messages m WHERE m.corp_id = s.corp_id AND m.from_user = s.staff_id LIMIT 1) " +
+            "</if>" +
+            "ORDER BY s.created_at DESC " +
+            "LIMIT #{offset}, #{size}" +
+            "</script>")
+    List<Staff> selectStaffPage(@Param("corpId") String corpId,
+                                @Param("keyword") String keyword,
+                                @Param("hasArchive") boolean hasArchive,
+                                @Param("offset") int offset,
+                                @Param("size") int size);
+
+    @Select("<script>" +
+            "SELECT COUNT(*) FROM staffs s " +
+            "WHERE s.corp_id = #{corpId} " +
+            "<if test='keyword != null and keyword != \"\"'>" +
+            " AND (s.staff_id LIKE CONCAT('%', #{keyword}, '%') OR s.name LIKE CONCAT('%', #{keyword}, '%')) " +
+            "</if>" +
+            "<if test='hasArchive'>" +
+            " AND EXISTS (SELECT 1 FROM archive_messages m WHERE m.corp_id = s.corp_id AND m.from_user = s.staff_id LIMIT 1) " +
+            "</if>" +
+            "</script>")
+    Long countStaffPage(@Param("corpId") String corpId,
+                        @Param("keyword") String keyword,
+                        @Param("hasArchive") boolean hasArchive);
 }

backend/archive-service/src/main/java/com/artedu/archive/service/ArchiveSessionService.java

@@ -51,24 +51,17 @@ public class ArchiveSessionService {
      * 员工列表
      */
     public PageResult<StaffSessionVO> listStaffs(String keyword, int page, int size, boolean hasArchive) {
-        LambdaQueryWrapper<Staff> wrapper = new LambdaQueryWrapper<>();
+        int offset = (page - 1) * size;
-        wrapper.eq(Staff::getCorpId, corpId);
+        Long total = staffMapper.countStaffPage(corpId, keyword, hasArchive);
-        if (keyword != null && !keyword.isEmpty()) {
+        if (total == null || total == 0) {
-            wrapper.and(w -> w.like(Staff::getStaffId, keyword).or().like(Staff::getName, keyword));
-        }
-        // 只展示有会话存档的员工
-        if (hasArchive) {
-            List<String> archiveStaffIds = archiveMessageMapper.selectStaffIdsWithArchive(corpId);
-            if (archiveStaffIds == null || archiveStaffIds.isEmpty()) {
             return PageResult.of(page, size, 0L, Collections.emptyList());
         }
-            wrapper.in(Staff::getStaffId, archiveStaffIds);
-        }
-        wrapper.orderByDesc(Staff::getCreatedAt);
 
-        Page<Staff> pageResult = staffMapper.selectPage(new Page<>(page, size), wrapper);
+        List<Staff> staffList = staffMapper.selectStaffPage(corpId, keyword, hasArchive, offset, size);
-        List<StaffSessionVO> list = pageResult.getRecords().stream().map(this::convertStaffVO).collect(Collectors.toList());
+        List<StaffSessionVO> list = staffList.stream().map(this::toBaseStaffVO).collect(Collectors.toList());
-        return PageResult.of(page, size, pageResult.getTotal(), list);
+        List<String> staffIds = staffList.stream().map(Staff::getStaffId).collect(Collectors.toList());
+        fillStaffStats(list, staffIds);
+        return PageResult.of(page, size, total, list);
     }
 
     /**
@@ -228,6 +221,12 @@ public class ArchiveSessionService {
     // ============ 私有方法 ============
 
     private StaffSessionVO convertStaffVO(Staff staff) {
+        StaffSessionVO vo = toBaseStaffVO(staff);
+        fillStaffStats(Collections.singletonList(vo), Collections.singletonList(staff.getStaffId()));
+        return vo;
+    }
+
+    private StaffSessionVO toBaseStaffVO(Staff staff) {
         StaffSessionVO vo = new StaffSessionVO();
         vo.setStaffId(staff.getStaffId());
         vo.setName(staff.getName());
@@ -237,24 +236,41 @@ public class ArchiveSessionService {
         vo.setStatus(staff.getStatus());
         vo.setCreatedAt(staff.getCreatedAt());
         vo.setUpdatedAt(staff.getUpdatedAt());
+        return vo;
+    }
 
-        // 查询统计
+    private void fillStaffStats(List<StaffSessionVO> vos, List<String> staffIds) {
+        if (vos == null || vos.isEmpty() || staffIds == null || staffIds.isEmpty()) {
+            return;
+        }
         try {
-            Long msgCount = archiveMessageMapper.selectCount(
+            List<Map<String, Object>> statsList = archiveMessageMapper.selectStaffArchiveStats(corpId, staffIds);
-                    new com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper<ArchiveMessage>()
+            Map<String, Map<String, Object>> statsMap = statsList.stream()
-                            .eq(ArchiveMessage::getCorpId, corpId)
+                    .collect(Collectors.toMap(m -> (String) m.get("staff_id"), m -> m, (a, b) -> a));
-                            .eq(ArchiveMessage::getFromUser, staff.getStaffId())
+
-            );
+            List<Map<String, Object>> custList = customerMapper.countCustomersByStaffIds(corpId, staffIds);
-            vo.setMsgCount(msgCount != null ? msgCount.intValue() : 0);
+            Map<String, Integer> custMap = custList.stream()
-            vo.setTodayMsgCount(archiveMessageMapper.countTodayMsgByStaff(staff.getStaffId(), corpId));
+                    .collect(Collectors.toMap(m -> (String) m.get("staff_id"), m -> ((Number) m.get("customer_count")).intValue(), (a, b) -> a));
-            vo.setCustomerCount(archiveMessageMapper.countCustomersByStaff(staff.getStaffId(), corpId));
+
-            Long lastMsgTime = archiveMessageMapper.selectLastMsgTimeByUser(staff.getStaffId(), corpId);
+            for (StaffSessionVO vo : vos) {
+                Map<String, Object> stats = statsMap.get(vo.getStaffId());
+                if (stats != null) {
+                    vo.setMsgCount(((Number) stats.get("msg_count")).intValue());
+                    vo.setTodayMsgCount(((Number) stats.get("today_msg_count")).intValue());
+                    Long lastMsgTime = stats.get("last_msg_time") instanceof Number ? ((Number) stats.get("last_msg_time")).longValue() : null;
                     vo.setLastMsgTime(lastMsgTime);
                     vo.setLastMsgTimeStr(formatTime(lastMsgTime));
-        } catch (Exception e) {
+                } else {
-            log.debug("查询员工统计失败: {}", e.getMessage());
+                    vo.setMsgCount(0);
+                    vo.setTodayMsgCount(0);
+                    vo.setLastMsgTime(null);
+                    vo.setLastMsgTimeStr(formatTime(null));
+                }
+                vo.setCustomerCount(custMap.getOrDefault(vo.getStaffId(), 0));
+            }
+        } catch (Exception e) {
+            log.warn("查询员工统计失败: {}", e.getMessage(), e);
         }
-        return vo;
     }
 
     private CustomerSessionVO convertCustomerVO(Customer customer) {