28）PHP，数据库连接类

PHP代码展示：

 <?php
 //类名，也习惯上（推荐）使用跟文件名相似的名字
 //定义一个类，该类可以连接mysql数据库
 //并连接后返回资源（或失败就终止）
 class mysqlDB{
     public $host;
     public $port;
     public $username;
     public $password;
     public $charset;
     public $dbname;

     //连接结果（资源）
     static $link;

     //构造函数
     public function __construct($config){
         //初始化数据
         $this->host = isset($config['host']) ? $config['host'] : 'localhost';
         $this->port = isset($config['port']) ? $config['port'] : '';
         $this->username = isset($config['username']) ? $config['username'] : 'root';
         $this->password = isset($config['password']) ? $config['password'] : '';
         $this->charset = isset($config['charset']) ? $config['charset'] : 'utf8';
         $this->dbname = isset($config['dbname']) ? $config['dbname'] : '';

         //连接数据库
         self::$link = $this->connect();
         //设定连接编码
         $this->setCharset($this->charset);
         //选定数据库
         $this->selectDb($this->dbname);
     }
     //这里进行连接
     public function connect(){
         $link = mysql_connect("$this->host:$this->port", "$this->username","$this->password") or die("连接数据库失败！");
         return $link;
     }
     public function setCharset($charset){
         mysql_set_charset($charset, self::$link);
     }
     public function selectDb($dbname){
         mysql_select_db($dbname, self::$link)
     }
 }

 //先设想：
 $config = array(
     'host'=>'localhost',
     'port'=>'',
     'username'=>'root',
     'password'=>'',
     'charset'=>'utf8',
     'dbname'=>'php34',
     );
 $link = new mysqlDB( $config );
 $result = $link->query("delete from tab1 where id=1");

大概就是这个样子，我没有试，不过思路就是这个。