Method __construct

/**
 * Constructor
 *
 * @param   Adapter         $parent   Parent object
 * @param   DatabaseDriver  $db       Database object
 * @param   array           $options  Configuration Options
 *
 * @since   1.6
 */
public function __construct(Adapter $parent, DatabaseDriver $db, array $options = array())
{
    // Set the properties from the options array that is passed in
    $this->setProperties($options);
    // Set the parent and db in case $options for some reason overrides it.
    $this->parent = $parent;
    // Pull in the global dbo in case something happened to it.
    $this->db = $db ?: Factory::getDbo();
}