php连接mysql数据库的几种方法

php连接mysql数据库的几种方法

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）

  
  
  
  

   
   
   
   
<?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);
   
   
   
   
}
   
   
   
   
?>