PHP与数据库连接的方式有哪些？

1.最简单的方式

<?php$con = mysql_connect("localhost","root","");if (!$con) { die('Could not connect: ' . mysql_error()); }mysql_close($con);?>

2.面向对象mysqli（详细教程）

<?php$mysqli = new mysqli('localhost','root','','volunteer');if (mysqli_connect_errno()){ die('Unable to connect!'). mysqli_connect_error();}?>

3.pdo连接mysql（详细教程）

<?php $db = new PDO('mysql:host=localhost;dbname=test', 'root', '');try { foreach ($db->query('select * from user') as $row){ print_r($row); } $db = null; //关闭数据库} catch (PDOException $e) { echo $e->getMessage();}?>

4.ADODB连接mysql（详细教程）

<?phprequire_once './adodb5/adodb.inc.php';$conn = &ADONewConnection('mysql');$conn->connect('localhost','root','','test');$conn->Execute("set names utf8");$res = $conn->Execute("select * from user");if (!$res){ echo $conn->ErrorMsg();}else{ var_dump($res);}?>

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