php try catch : 捕捉异常,抛出异常：/**

* 构造函数：自动加载连接数据库

* @param $database $key

* @return

*/

private function __construct($database = array(), $key){

try{

$this->server = $database['db_host'];

$this->username = $database['db_user'];

$this->password = $database['db_pwd'];

$this->database_name = $database['db_name'];

$this->database_type = $database['db_type'];

$this->database_port = $database['db_port'];

if($this->database_type == 'mysql'){

$this->pdo = new PDO($this->database_type . ':host=' .

$this->server . ';port=' .

$this->database_port . ';dbname=' .

$this->database_name,

$this->username,

$this->password, array(PDO::ATTR_TIMEOUT => self::TIME_OUT));

}else{

$this->pdo = new PDO ("dblib:host=$this->server:$this->database_port;

dbname=$this->database_name","$this->username","$this->password");

}

$this->pdo->exec('SET NAMES \'' . $this->charset . '\'');

self::$pdo_ref[$key] = &$this->pdo;

}catch(PDOException $e){

echo $e->getMessage();

}

}

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