/**
* @return PDOStatement
*/
public function execute($sql, $params = NULL, $flag = true)
{
if (DEBUG) {
CxBug::sql($sql, $params);
}
$db = $this->prepare($sql);
$result = is_null($params) ? $db->execute() : $db->execute($params);
if (false !== $result) {
return $db;
}
if (DEBUG) {
$result = $db->errorInfo();
if (empty($result)) {
$result = 'sql execute error!';
} else {
$result = $result[2];
}
throw new Exception($result);
}
}
private static function _clear()
{
self::$sql = null;
self::$log = null;
self::$start = null;
self::$time = null;
self::$server = null;
self::$exception = null;
self::$session = null;
//self::$show;
//self::$key;
}