fix: 水质达标统计优化

backend/src/main/java/com/yfd/platform/qgc_export/service/impl/QgcExportServiceImpl.java

@@ -1413,10 +1413,28 @@ public class QgcExportServiceImpl implements IQgcExportService {
         String timestamp = String.valueOf(System.currentTimeMillis());
 
         // 预查询测站信息（年维度无关，一次查询即可）
+        // 先查所有电站名称（不限 STTP），用于占位电站显示名称
+        Map<String, String> allStationNames = new LinkedHashMap<>();
+        if (!stationCodes.isEmpty()) {
+            List<StationInfo> allStations = yearStatMapper.selectList(
+                    new LambdaQueryWrapper<StationInfo>()
+                            .and(w -> w.in(StationInfo::getRstcd, stationCodes)
+                                       .or()
+                                       .in(StationInfo::getStcd, stationCodes))
+            );
+            for (StationInfo s : allStations) {
+                String key = s.getRstcd() != null ? s.getRstcd() : s.getStcd();
+                // 取第一个非空名称：ENNM > STNM > key
+                String name = s.getEnnm() != null ? s.getEnnm() : s.getStnm();
+                allStationNames.putIfAbsent(key, name != null ? name : key);
+            }
+        }
+
         List<StationInfo> wqStations = null;
         List<StationInfo> engStations = null;
         if (hasWq && !stationCodes.isEmpty()) {
-            wqStations = yearStatMapper.selectList(
+            // 查询 V_MS_STBPRP_T 中 MWAY=2（自动站）的 WQ 测站
+            List<StationInfo> dbWqStations = yearStatMapper.selectList(
                     new LambdaQueryWrapper<StationInfo>()
                             .eq(StationInfo::getSttp, "WQ")
                             .eq(StationInfo::getMway, 2)
@@ -1424,6 +1442,27 @@ public class QgcExportServiceImpl implements IQgcExportService {
                                     .or()
                                     .in(StationInfo::getStcd, stationCodes))
             );
+            // 按前端传的 stationCodes 顺序构建完整列表（无数据的电站也显示空行）
+            Map<String, StationInfo> rstcdMap = new LinkedHashMap<>();
+            for (StationInfo s : dbWqStations) {
+                String key = s.getRstcd() != null ? s.getRstcd() : s.getStcd();
+                rstcdMap.putIfAbsent(key, s);
+            }
+            wqStations = new ArrayList<>();
+            for (String code : stationCodes) {
+                StationInfo found = rstcdMap.get(code);
+                if (found != null) {
+                    wqStations.add(found);
+                } else {
+                    // 无 WQ 自动站数据的电站，从名称映射中取名称
+                    String name = allStationNames.getOrDefault(code, code);
+                    StationInfo placeholder = new StationInfo();
+                    placeholder.setRstcd(code);
+                    placeholder.setStcd(code);
+                    placeholder.setEnnm(name);
+                    wqStations.add(placeholder);
+                }
+            }
             if (!wqStations.isEmpty()) {
                 wqStations = sortStationsByOrder(wqStations);
             }