refactor(oa): 优化项目列表查询逻辑

- 添加空列表检查避免空指针异常
- 使用流式收集项目ID用于后续范围查询
- 分别对工艺卡和送货单进行分组统计
- 通过Map结构提高查询效率避免重复数据库访问
- 保留原有VO转换及数据组装逻辑
- 确保只统计未删除的数据记录
- 提升接口性能减少不必要的循环查询

ruoyi-oa/src/main/java/com/ruoyi/oa/service/impl/OaProcessCardServiceImpl.java

@@ -191,25 +191,46 @@ public class OaProcessCardServiceImpl implements IOaProcessCardService {
     public List<SysOaProjectVo> queryProjectList() {
         // 拿到项目名字projectName projectNum projectCode
         List<SysOaProject> sysOaProjects = sysOaProjectMapper.selectList();
-        // 现在已经有了projectId然后需要看到工艺还是发货哪个地方绑定了这个projectId
+        if (sysOaProjects == null || sysOaProjects.isEmpty()) {
+            return Collections.emptyList();
+        }
+
+        // 收集项目ID，后续仅在这些ID范围内分组统计
+        List<Long> projectIds = sysOaProjects.stream()
+                .map(SysOaProject::getProjectId)
+                .collect(Collectors.toList());
+
+        // 1) 分组统计工艺卡数量（未删除）
+        QueryWrapper<OaProcessCard> pcQw = Wrappers.query();
+        pcQw.select("project_id AS projectId", "COUNT(1) AS cnt");
+        pcQw.in(!projectIds.isEmpty(), "project_id", projectIds);
+        pcQw.eq("del_flag", 0);
+        pcQw.groupBy("project_id");
+        Map<Long, Long> processCardCountMap = baseMapper.selectMaps(pcQw).stream()
+                .collect(Collectors.toMap(
+                        m -> ((Number) m.get("projectId")).longValue(),
+                        m -> ((Number) m.get("cnt")).longValue()
+                ));
+
+        // 2) 分组统计送货单数量（未删除）
+        QueryWrapper<OaDeliveryOrder> doQw = Wrappers.query();
+        doQw.select("project_id AS projectId", "COUNT(1) AS cnt");
+        doQw.in(!projectIds.isEmpty(), "project_id", projectIds);
+        doQw.eq("del_flag", 0);
+        doQw.groupBy("project_id");
+        Map<Long, Long> deliveryOrderCountMap = oaDeliveryOrderMapper.selectMaps(doQw).stream()
+                .collect(Collectors.toMap(
+                        m -> ((Number) m.get("projectId")).longValue(),
+                        m -> ((Number) m.get("cnt")).longValue()
+                ));
+
+        // 3) 组装返回
         List<SysOaProjectVo> sysOaProjectVos = sysOaProjects.stream()
-                .map(sysOaProject -> {
-                    SysOaProjectVo vo = BeanUtil.toBean(sysOaProject, SysOaProjectVo.class);
-                    Long projectId = sysOaProject.getProjectId();
-                    // 统计工艺卡数量（未删除）
-                    Long processCardCount = baseMapper.selectCount(
-                            Wrappers.<OaProcessCard>lambdaQuery()
-                                    .eq(OaProcessCard::getProjectId, projectId)
-                                    .eq(OaProcessCard::getDelFlag, 0)
-                    );
-                    vo.setProcessCardCount(processCardCount);
-                    // 统计送货单数量（未删除）
-                    Long deliveryOrderCount = oaDeliveryOrderMapper.selectCount(
-                            Wrappers.<OaDeliveryOrder>lambdaQuery()
-                                    .eq(OaDeliveryOrder::getProjectId, projectId)
-                                    .eq(OaDeliveryOrder::getDelFlag, 0)
-                    );
-                    vo.setDeliveryOrderCount(deliveryOrderCount);
+                .map(p -> {
+                    SysOaProjectVo vo = BeanUtil.toBean(p, SysOaProjectVo.class);
+                    Long pid = p.getProjectId();
+                    vo.setProcessCardCount(processCardCountMap.getOrDefault(pid, 0L));
+                    vo.setDeliveryOrderCount(deliveryOrderCountMap.getOrDefault(pid, 0L));
                     return vo;
                 })
                 .collect(Collectors.toList());