php連接mysql數據庫的幾種方法(基礎知識不能忘啊)

1.最簡單的方式

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

2.面向對象mysqli

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

3.pdo連接mysql

<?php 

$db = new PDO('mysql:host=localhost;dbname=test', 'root', '');
try {
    foreach ($db->query('select * from user') as $row){
        print_r($row);
    }
    $db = null;  //關閉數據庫
} catch (PDOException $e) {
    echo $e->getMessage();
}
?>

4.ADODB連接mysql

<?php
require_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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