/**
* 连接PDO
* @param string $dbConfig
* @return boolean
*/
public function __construct($dbConfig = '')
{
if (!class_exists("PDO")) {
self::throw_exception('不支持PDO，请先开启');
}
// 如果没有传递参数，使用默认配置连接
if (!is_array($dbConfig)) {
$dbConfig = array('hostname' => DB_HOST, 'username' => DB_USER, 'password' => DB_PWD, 'database' => DB_NAME, 'hostport' => DB_PORT, 'dbms' => DB_TYPE, 'dsn' => DB_TYPE . ":host=" . DB_HOST . ";dbname=" . DB_NAME);
}
if (empty($dbConfig['hostname'])) {
self::throw_exception('没有定义数据库配置，请先定义');
}
self::$config = $dbConfig;
if (empty(self::$config['params'])) {
self::$config['params'] = array();
}
if (!isset(self::$link)) {
$configs = self::$config;
if (self::$pconnect) {
//开启长连接，添加到配置数组中
$configs['params'][constant("PDO::ATTR_PERSISTENT")] = true;
}
try {
self::$link = new PDO($configs['dsn'], $configs['username'], $configs['password'], $configs['params']);
} catch (PDOException $e) {
self::throw_exception($e->getMessage());
}
if (!self::$link) {
self::throw_exception('PDO连接错误');
return false;
}
self::$link->exec('SET NAMES ' . DB_CHARSET);
self::$dbVersion = self::$link->getAttribute(constant("PDO::ATTR_SERVER_VERSION"));
self::$connected = true;
unset($configs);
}
}