getDatabaseReadAdapter() public method

public getDatabaseReadAdapter ( ) : Varien_Db_Adapter_Interface
return Varien_Db_Adapter_Interface
 /**
  * @return array
  */
 public function getAllValues()
 {
     $read = $this->_magento->getDatabaseReadAdapter();
     $query = $read->select()->from($this->_table_name, array('scope', 'scope_id', 'path', 'value'));
     return $read->fetchAll($query);
 }