PHP MySQL Use The ORDER BY Clause

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PHP MySQL Use The ORDER BY Clause

The ORDER BY clause is used to sort the result-set in ascending or descending order.

SELECT column_name(s) FROM table_name ORDER BY column_name(s) ASC|DESC

Example (MySQLi Object-oriented)

    •       
                        <?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = new mysqli($servername, $username, $password, 
$dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT id, firstname, lastname FROM MyGuests ORDER BY
 lastname";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
    echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " 
    " . $row["lastname"]. "
    ";
    }
} else {
    echo "0 results";
}
$conn->close();
?>

    Example (MySQLi Procedural)

    ` 
    •       
                        <?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

$sql = "SELECT id, firstname, lastname FROM MyGuests
 ORDER BY lastname";
$result = mysqli_query($conn, $sql);

if (mysqli_num_rows($result) > 0) {
    // output data of each row
    while($row = mysqli_fetch_assoc($result)) {
    echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. "
     " . $row["lastname"]. "
    ";
    }
} else {
    echo "0 results";
}

mysqli_close($conn);
?>

    Example (PDO)

    ` 
    •       
                        <?php
echo "<table style='border: solid 1px black;'>";
echo "<tr><th>Id</th><th>Firstname</th
<th>Lastname</th></tr>";

class TableRows extends RecursiveIteratorIterator {
    function __construct($it) {
    parent::__construct($it, self::LEAVES_ONLY);
    }

    function current() {
    return "<td style='width:150px;border:1px solid black;'>"
     . parent::current(). "</td>";
    }

    function beginChildren() {
    echo "<tr>";
    }

    function endChildren() {
    echo "</tr>" . "\n";
    }
}

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname",
     $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $stmt = $conn->prepare("SELECT id, firstname, lastname FROM 
    MyGuests ORDER BY lastname");
    $stmt->execute();

    // set the resulting array to associative
    $result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
    foreach(new TableRows(new RecursiveArrayIterator
    ($stmt->fetchAll())) as $k=>$v) {
    echo $v;
    }
} catch(PDOException $e) {
    echo "Error: " . $e->getMessage();
}
$conn = null;
echo "</table>";
?>

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