/**
*
* Set the currently selected database instance, will be used
* for subsequent operations of this helper class, until
* another one is selected
*
* @param string $name name of database instance to select
* @throws CliExceptionDefault
*/
public static function selectDb($name = 'default')
{
if (empty($name) || empty(self::$_instances[$name])) {
throw new Sh404sefExceptionDefault('Trying to select a database that has not been set: ' . $name);
}
self::$_selected = $name;
}