fix: 调整最新数据的显示

http_server.go

@@ -17,6 +17,7 @@ func StartHTTPServer(address string) error {
 	http.HandleFunc("/", handleIndex)
 
 	http.HandleFunc("/api/data", handleGetData)
+	http.HandleFunc("/api/latest", handleGetLatest)
 	http.HandleFunc("/api/sensors", handleGetSensors)
 	http.HandleFunc("/api/clients", handleGetClients)
 	http.HandleFunc("/api/trigger-query", handleTriggerQuery)
@@ -112,11 +113,18 @@ func handleGetData(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
+	// 特殊处理获取最新数据的请求
+	if limit == 1 && sensorIDStr == "" {
+		log.Printf("检测到获取最新数据请求 (limit=1)")
+	}
+
 	var data []SensorData
 	if sensorIDStr == "all" || sensorIDStr == "" {
 		data, err = GetAllSensorData(limit, startDate, endDate)
+		log.Printf("查询所有传感器数据，limit=%d, 结果数量=%d", limit, len(data))
 	} else {
 		data, err = GetSensorData(sensorID, limit, startDate, endDate)
+		log.Printf("查询传感器%d数据，limit=%d, 结果数量=%d", sensorID, limit, len(data))
 	}
 
 	if err != nil {
@@ -125,6 +133,13 @@ func handleGetData(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// 输出最新数据的详细信息（当limit=1时）
+	if limit == 1 && len(data) > 0 {
+		latest := data[0]
+		log.Printf("返回最新数据: ID=%d, SensorID=%d, X=%.3f, Y=%.3f, Z=%.3f, Temperature=%.1f, Timestamp=%s",
+			latest.ID, latest.SensorID, latest.X, latest.Y, latest.Z, latest.Temperature, latest.Timestamp.Format("2006-01-02 15:04:05"))
+	}
+
 	if noLimit {
 		log.Printf("成功获取到所有数据记录（%d条）", len(data))
 	} else {
@@ -192,3 +207,40 @@ func handleTriggerQuery(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "编码JSON失败："+err.Error(), http.StatusInternalServerError)
 	}
 }
+
+// 处理获取最新传感器数据的API
+func handleGetLatest(w http.ResponseWriter, r *http.Request) {
+	log.Printf("接收到获取最新数据请求")
+
+	w.Header().Set("Content-Type", "application/json")
+
+	// 获取最新的一条数据
+	data, err := GetAllSensorData(1, time.Time{}, time.Time{})
+	if err != nil {
+		log.Printf("错误: 获取最新数据失败: %v", err)
+		http.Error(w, "获取最新数据失败："+err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	log.Printf("查询最新数据结果数量: %d", len(data))
+
+	if len(data) == 0 {
+		log.Printf("数据库中没有任何数据")
+		// 返回空数组而不是错误
+		if err := json.NewEncoder(w).Encode([]SensorData{}); err != nil {
+			log.Printf("错误: 编码空数据JSON失败: %v", err)
+			http.Error(w, "编码JSON失败："+err.Error(), http.StatusInternalServerError)
+		}
+		return
+	}
+
+	// 输出最新数据的详细信息
+	latest := data[0]
+	log.Printf("返回最新数据: ID=%d, SensorID=%d, X=%.3f, Y=%.3f, Z=%.3f, Temperature=%.1f, Timestamp=%s",
+		latest.ID, latest.SensorID, latest.X, latest.Y, latest.Z, latest.Temperature, latest.Timestamp.Format("2006-01-02 15:04:05"))
+
+	if err := json.NewEncoder(w).Encode(data); err != nil {
+		log.Printf("错误: 编码最新数据JSON失败: %v", err)
+		http.Error(w, "编码JSON失败："+err.Error(), http.StatusInternalServerError)
+	}
+}

templates/index.html

@@ -760,38 +760,85 @@
 
         // 获取最新传感器数据
         function fetchLatestData() {
-            fetch('/api/data?limit=1')
+            console.log('正在获取最新传感器数据...');
-                .then(response => response.json())
+            fetch('/api/latest')
+                .then(response => {
+                    console.log('获取最新数据响应状态:', response.status);
+                    if (!response.ok) {
+                        throw new Error(`HTTP错误: ${response.status}`);
+                    }
+                    return response.json();
+                })
                 .then(data => {
+                    console.log('获取到的最新数据:', data);
                     if (data && data.length > 0) {
                         const latest = data[0];
                         updateLatestDataDisplay(latest);
+                        console.log('最新数据显示更新完成');
+                    } else {
+                        console.log('数据库中没有数据');
+                        updateLatestDataDisplayEmpty();
                     }
                 })
                 .catch(error => {
                     console.error('获取最新数据失败:', error);
+                    updateLatestDataDisplayError(error.message);
                 });
         }
 
         // 更新最新数据显示
         function updateLatestDataDisplay(data) {
-            const date = new Date(data.timestamp);
+            try {
-            date.setHours(date.getHours() - 8);
+                const date = new Date(data.timestamp);
-            
+                date.setHours(date.getHours() - 8);
-            const formattedDate = 
+                
-                date.getFullYear() + '/' + 
+                const formattedDate = 
-                (date.getMonth() + 1).toString().padStart(2, '0') + '/' + 
+                    date.getFullYear() + '/' + 
-                date.getDate().toString().padStart(2, '0') + ' ' + 
+                    (date.getMonth() + 1).toString().padStart(2, '0') + '/' + 
-                date.getHours().toString().padStart(2, '0') + ':' + 
+                    date.getDate().toString().padStart(2, '0') + ' ' + 
-                date.getMinutes().toString().padStart(2, '0') + ':' + 
+                    date.getHours().toString().padStart(2, '0') + ':' + 
-                date.getSeconds().toString().padStart(2, '0');
+                    date.getMinutes().toString().padStart(2, '0') + ':' + 
+                    date.getSeconds().toString().padStart(2, '0');
 
-            document.getElementById('latest-time').textContent = `(${formattedDate})`;
+                document.getElementById('latest-time').textContent = `(${formattedDate})`;
-            document.getElementById('latest-sensor-id').textContent = data.sensor_id;
+                document.getElementById('latest-sensor-id').textContent = data.sensor_id;
-            document.getElementById('latest-x').textContent = data.x.toFixed(3);
+                document.getElementById('latest-x').textContent = data.x.toFixed(3);
-            document.getElementById('latest-y').textContent = data.y.toFixed(3);
+                document.getElementById('latest-y').textContent = data.y.toFixed(3);
-            document.getElementById('latest-z').textContent = data.z.toFixed(3);
+                document.getElementById('latest-z').textContent = data.z.toFixed(3);
-            document.getElementById('latest-temperature').textContent = data.temperature.toFixed(1);
+                document.getElementById('latest-temperature').textContent = data.temperature.toFixed(1);
+                
+                console.log('最新数据显示更新成功:', {
+                    sensor_id: data.sensor_id,
+                    time: formattedDate,
+                    x: data.x,
+                    y: data.y,
+                    z: data.z,
+                    temperature: data.temperature
+                });
+            } catch (error) {
+                console.error('更新最新数据显示时发生错误:', error);
+                updateLatestDataDisplayError('数据格式错误');
+            }
+        }
+
+        // 显示空数据状态
+        function updateLatestDataDisplayEmpty() {
+            document.getElementById('latest-time').textContent = '(暂无数据)';
+            document.getElementById('latest-sensor-id').textContent = '--';
+            document.getElementById('latest-x').textContent = '--';
+            document.getElementById('latest-y').textContent = '--';
+            document.getElementById('latest-z').textContent = '--';
+            document.getElementById('latest-temperature').textContent = '--';
+        }
+
+        // 显示错误状态
+        function updateLatestDataDisplayError(errorMsg) {
+            document.getElementById('latest-time').textContent = `(错误: ${errorMsg})`;
+            document.getElementById('latest-sensor-id').textContent = '--';
+            document.getElementById('latest-x').textContent = '--';
+            document.getElementById('latest-y').textContent = '--';
+            document.getElementById('latest-z').textContent = '--';
+            document.getElementById('latest-temperature').textContent = '--';
         }
 
         // 查询最新数据（触发设备查询）