每秒从mysql读取单个数据

Question

我正在从读取数据，并希望每秒更新一次数据。

<h1><?php
                $conn = new mysqli('localhost','q88','88888888','db');
                if ($conn->connect_error) {die("Connection failed: " . $conn->connect_error);
                }$sql = "SELECT text FROM datatable where name= 'Air Cooler'";
                $result = $conn->query($sql);if ($result->num_rows > 0) {while($row = $result->fetch_assoc()) {
                echo $row["text"];}} else {echo "0 results";}
                $conn->close();
                ?></h1>