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<?php
單列模式設(shè)計單列：一個實例
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);*/