What are common issues when formulating SQL queries for a booking system in PHP?

Issue: One common issue when formulating SQL queries for a booking system in PHP is not properly handling user input, which can lead to SQL injection attacks. To prevent this, always use prepared statements or parameterized queries to sanitize user input before including it in the SQL query. 

// Example of using prepared statements to prevent SQL injection

// Assuming $conn is the database connection object

// User input
$user_id = $_POST['user_id'];

// Prepare the SQL statement
$stmt = $conn->prepare("SELECT * FROM bookings WHERE user_id = ?");
$stmt->bind_param("i", $user_id);

// Execute the statement
$stmt->execute();

// Get the result
$result = $stmt->get_result();

// Process the result
while ($row = $result->fetch_assoc()) {
    // Handle each row
}

// Close the statement and connection
$stmt->close();
$conn->close();

Keywords

SQL queries booking system PHP database errors query optimization

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