public function getTables($dbName = '')
{
$sql = !empty($dbName) ? 'SHOW TABLES FROM ' . $dbName : 'SHOW TABLES ';
$result = $this->query($sql);
$info = array();
if ($result) {
foreach ($result as $key => $val) {
$info[$key] = current($val);
}
}
return $info;
}