What potential issues can arise when trying to use AJAX to retrieve data from a MySQL database in PHP?

One potential issue when using AJAX to retrieve data from a MySQL database in PHP is the lack of proper error handling. If there are errors in the SQL query or database connection, the AJAX request may fail without providing any useful feedback to the user. To solve this, you can implement error handling in your PHP code to catch and handle any errors that occur during the database query. 

// Connect to MySQL database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Perform SQL query
$sql = "SELECT * FROM table";
$result = $conn->query($sql);

if ($result === false) {
    die("Error executing query: " . $conn->error);
}

// Process and return data
$data = array();
while ($row = $result->fetch_assoc()) {
    $data[] = $row;
}

echo json_encode($data);

// Close database connection
$conn->close();

Keywords

AJAX MySQL database PHP asynchronous requests data retrieval

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