Update new xml query classes with xe 1.5

with improved query argument support and update and delete queries

git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0-DB@8378 201d5d3c-b55e-5fd7-737f-ddc643e51545

classes/db/queryparts/expression/UpdateExpression.class.php

@@ -0,0 +1,34 @@
+<?php 
+	/**
+	 * @class UpdateExpression
+	 * @author Arnia Software
+	 * @brief 
+	 *
+	 */
+
+	class UpdateExpression extends Expression {
+		var $value;
+		
+		function UpdateExpression($column_name, $value){
+			parent::Expression($column_name);
+			$this->value = $value;
+		}
+		
+		function getExpression(){
+			return "$this->column_name = $this->value";
+		}
+		
+		function getValue(){
+			// TODO Escape value according to column type instead of variable type
+			if(!is_numeric($this->value)) return "'".$this->value."'";
+			return $this->value;
+		}
+		
+		function show(){
+			if(!$this->value) return false;
+			return true;
+		}
+	}
+
+
+?>