Update add_record.php

Author: Abhijeetbyte

add_record.php

@@ -1,42 +1,35 @@
 <?php
-try {
-    // Check if required POST fields are set and not empty
-    if (empty($_POST['roll_number']) || empty($_POST['name']) || empty($_POST['date'])) {
-        throw new Exception('All fields are required.');
-    }
-
-    // Connect to the SQLite database
-    $db = new PDO('sqlite:records.db');
-
-    // Set error mode to exceptions
-    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
-
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
     // Sanitize user input
     $roll_number = filter_input(INPUT_POST, 'roll_number', FILTER_SANITIZE_STRING);
     $name = filter_input(INPUT_POST, 'name', FILTER_SANITIZE_STRING);
     $date = filter_input(INPUT_POST, 'date', FILTER_SANITIZE_STRING);
 
-    // Prepare an SQL statement for safe insertion
-    $stmt = $db->prepare("INSERT INTO students (roll_number, name, date) VALUES (:roll_number, :name, :date)");
+    try {
+        // Connect to SQLite database
+        $db = new PDO('sqlite:records.db');
+        $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 
-    // Bind values to the parameters
-    $stmt->bindParam(':roll_number', $roll_number);
-    $stmt->bindParam(':name', $name);
-    $stmt->bindParam(':date', $date);
+        // Check if the record already exists for the given roll_number and date
+        $stmt_check = $db->prepare('SELECT * FROM students WHERE roll_number = :roll_number AND date = :date');
+        $stmt_check->bindParam(':roll_number', $roll_number);
+        $stmt_check->bindParam(':date', $date);
+        $stmt_check->execute();
+        $existing_record = $stmt_check->fetch(PDO::FETCH_ASSOC);
 
-    // Execute the statement and check for success
-    if ($stmt->execute()) {
-        echo "Attendance submitted successfully.";
-    } else {
-        echo "Error submitting attendance.";
+        if ($existing_record) {
+            echo '<p>Attendance already exists for roll number ' . htmlspecialchars($roll_number) . ' on ' . htmlspecialchars($date) . '.</p>';
+        } else {
+            // Record does not exist, insert a new record
+            $stmt_insert = $db->prepare('INSERT INTO students (roll_number, name, date) VALUES (:roll_number, :name, :date)');
+            $stmt_insert->bindParam(':roll_number', $roll_number);
+            $stmt_insert->bindParam(':name', $name);
+            $stmt_insert->bindParam(':date', $date);
+            $stmt_insert->execute();
+            echo '<p>Attendance recorded successfully for roll number ' . htmlspecialchars($roll_number) . ' on ' . htmlspecialchars($date) . '.</p>';
+        }
+    } catch (PDOException $e) {
+        echo '<p>An error occurred: ' . $e->getMessage() . '</p>';
     }
-} catch (Exception $e) {
-    // Log the error message
-    error_log($e->getMessage());
-    echo "An error occurred: " . htmlspecialchars($e->getMessage());
-} catch (PDOException $e) {
-    // Log the error message
-    error_log($e->getMessage());
-    echo "An error occurred while submitting attendance.";
 }
 ?>