Folder reorganize 1

trends/live/realtime_data.php

@@ -0,0 +1,91 @@
+<?php
+header('Content-Type: application/json');
+header('Cache-Control: no-cache, must-revalidate');
+
+$servername = "192.168.0.13\\SQLEXPRESS";
+$username   = "opce";
+$password   = "opcelasuca";
+$dbname     = "history";
+
+try {
+    $pdo = new PDO(
+        "sqlsrv:Server=$servername;Database=$dbname",
+        $username,
+        $password,
+        [
+            PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
+            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
+        ]
+    );
+
+    // Get parameters
+    $tagName = $_GET['tag'] ?? '';
+    $lastTimestamp = $_GET['last_timestamp'] ?? null;
+    $limit = min((int)($_GET['limit'] ?? 500), 7200); // Max 10000 points
+    
+    $startTime = $_GET['start_time'] ?? null;
+    $endTime   = $_GET['end_time'] ?? null;
+    
+    if (empty($tagName)) {
+        throw new Exception('Tag name required');
+    }
+    
+    // Build query to get latest data from archive
+    $sql = "SELECT a.TimeStamp, a.Value, a.ID 
+            FROM dbo.archive a
+            LEFT JOIN dbo.id_names n ON a.ID = n.idnumber 
+            WHERE n.name = :tag_name";
+    
+    $params = [':tag_name' => $tagName];
+    
+    if ($startTime && $endTime) {
+        $sql .= " AND a.TimeStamp BETWEEN :start_time AND :end_time";
+        $params[':start_time'] = $startTime;
+        $params[':end_time']   = $endTime;
+    } elseif ($lastTimestamp) {
+        $sql .= " AND a.TimeStamp > :last_timestamp";
+        $params[':last_timestamp'] = $lastTimestamp;
+    }
+    
+    $sql .= " ORDER BY a.TimeStamp DESC OFFSET 0 ROWS FETCH NEXT :limit ROWS ONLY";
+    
+    $stmt = $pdo->prepare($sql);
+    
+    foreach ($params as $key => $value) {
+        $stmt->bindValue($key, $value);
+    }
+    $stmt->bindValue(':limit', $limit, PDO::PARAM_INT);
+    
+    $stmt->execute();
+    $results = $stmt->fetchAll();
+    
+    // Reverse to get chronological order
+    $results = array_reverse($results);
+    
+    // Format data for Chart.js
+    $data = [];
+    foreach ($results as $row) {
+        $data[] = [
+            'x'         => $row['TimeStamp'],
+            'y'         => (float)$row['Value'],
+            'timestamp' => $row['TimeStamp']
+        ];
+    }
+    
+    $response = [
+        'success'          => true,
+        'data'             => $data,
+        'count'            => count($data),
+        'latest_timestamp' => !empty($data) ? end($data)['timestamp'] : null,
+        'tag'              => $tagName
+    ];
+    
+} catch (Exception $e) {
+    $response = [
+        'success' => false,
+        'error'   => $e->getMessage()
+    ];
+}
+
+echo json_encode($response);
+?>