<?php
/* $Id$ */
namespace Mammut\DB\Sql\Expression;

(defined('MAMMUT') && (basename(__FILE__) != basename($_SERVER['PHP_SELF']))) or die('ACCESS DENIED');

/**
 * Expression which does a boolean expression
 *
 * @author Stefan Daurer <s.daurer@q-spot.org>
 * @package Mammut\DB\Sql
 */
interface iExprBool extends iExpression {
	// boolean expressions
	const EXPR_BETWEEN = 'expr_calculate';
	const EXPR_CALCULATE = 'expr_calculate';
	const EXPR_COMPARE = 'expr_compare';
	const EXPR_IN = 'expr_in';
	const EXPR_NOTIN = 'expr_notin';
	const EXPR_ISNULL = 'expr_isnull';
	const EXPR_ISNOTNULL = 'expr_isnotnull';
	const EXPR_LIKE = 'expr_like';
	const EXPR_NOTLIKE = 'expr_notlike';
	
	// logic operator types
	const OP_EQ = '=';
	const OP_NE = '!=';
	const OP_LT = '<';
	const OP_LTE = '<=';
	const OP_GT = '>';
	const OP_GTE = '>=';
	const OP_AND = 'AND';
	const OP_OR = 'OR';
	const OP_NOT = '!';
}