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以单例模式实现数据库连接
<?php class Db { static private $_instance; static private $_connectSource; private $_dbConfig = array( 'host' => '127.0.0.1', 'user' => 'root', 'password' => '', 'database' => 'video', ); private function __construct() { } static public function getInstance() { if(!(self::$_instance instanceof self)) { self::$_instance = new self(); } return self::$_instance; } public function connect() { if(!self::$_connectSource) { self::$_connectSource = @mysql_connect($this->_dbConfig['host'], $this->_dbConfig['user'], $this->_dbConfig['password']); if(!self::$_connectSource) { throw new Exception('mysql connect error ' . mysql_error()); //die('mysql connect error' . mysql_error()); } mysql_select_db($this->_dbConfig['database'], self::$_connectSource); mysql_query("set names UTF8", self::$_connectSource); } return self::$_connectSource; } } /*$connect = Db::getInstance()->connect(); $sql = "select * from video"; $result = mysql_query($sql, $connect); echo mysql_num_rows($result); var_dump($result);*/
以单例模式实现数据库连接
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