/**
* 获得静态对象实例
*
* @return self
*/
public static function instance($offset = null)
{
$dkey = empty($offset) ? 'default' : $offset;
$key = 'database:' . $dkey;
$oo = '__objects';
if (!empty($GLOBALS[$oo][$key]) && is_object($GLOBALS[$oo][$key])) {
return $GLOBALS[$oo][$key];
}
$policy = Kohana::$config->load('zpdo')->{$dkey};
foreach (array('dsn', 'username', 'password', 'boost', 'options') as $k) {
$policy[$k] = array_key_exists($k, $policy) ? $policy[$k] : null;
}
try {
$object = new Zpdo_Natural($policy);
} catch (Exception $e) {
if (is_null($object) && $dkey != 'default') {
return Zpdo::instance();
}
throw $e;
}
//循环执行boost中的SQL语句
if (0 < count($policy['boost'])) {
foreach ($policy['boost'] as $v) {
$object->exec($v);
}
}
//END boost
$GLOBALS[$oo][$key] = $object;
return $GLOBALS[$oo][$key];
}
/**
* 获得 数据库 对象
* @return object
*/
public function getDatabase($dbname = null)
{
if (!is_object($this->_db)) {
$this->_db = Zpdo::instance($dbname);
}
return $this->_db;
}
