php如何执行非缓冲查询API

<?php$mysqli = new mysqli("localhost", "my_user", "my_password", "world");$uresult = $mysqli->query("SELECT Name FROM City", MYSQLI_USE_RESULT);if ($uresult) {  while ($row = $uresult->fetch_assoc()) {    echo $row['Name'] . PHP_EOL;  }}$uresult->close();?>

<?php$pdo = new PDO("mysql:host=localhost;dbname=world", 'my_user', 'my_pass');$pdo->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false);$uresult = $pdo->query("SELECT Name FROM City");if ($uresult) {  while ($row = $uresult->fetch(PDO::FETCH_ASSOC)) {    echo $row['Name'] . PHP_EOL;  }}?>

<?php$conn = mysql_connect("localhost", "my_user", "my_pass");$db  = mysql_select_db("world");$uresult = mysql_unbuffered_query("SELECT Name FROM City");if ($uresult) {  while ($row = mysql_fetch_assoc($uresult)) {    echo $row['Name'] . PHP_EOL;  }}?>