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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2016 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Db\Sql;
interface ExpressionInterface
{
const TYPE_IDENTIFIER = 'identifier';
const TYPE_VALUE = 'value';
const TYPE_LITERAL = 'literal';
const TYPE_SELECT = 'select';
/**
* @abstract
*
* @return array of array|string should return an array in the format:
*
* array (
* // a sprintf formatted string
* string $specification,
*
* // the values for the above sprintf formatted string
* array $values,
*
* // an array of equal length of the $values array, with either TYPE_IDENTIFIER or TYPE_VALUE for each value
* array $types,
* )
*
*/
public function getExpressionData();
}