added DataMapper Example

DataMapper/User.php

@@ -1,5 +1,13 @@
 <?php
 
+namespace DesignPatterns;
+
+/**
+ * DataMapper pattern
+ *
+ * This is our representation of a DataBase record in the memory
+ *
+ */
 class User
 {
 	protected $userId;
@@ -13,39 +21,6 @@ class User
         }
     }
 
-    public function __set($name, $value)
-    {
-        $method = 'set' . $name;
-        if (('mapper' == $name) || !method_exists($this, $method)) {
-            throw new Exception('Invalid Offer property');
-        }
-        $this->$method($value);
-    }
-
-    public function __get($name)
-    {
-        $method = 'get' . $name;
-        if (('mapper' == $name) || !method_exists($this, $method)) {
-            throw new Exception('Invalid Offer property');
-        }
-        return $this->$method();
-    }
-
-    public function setOptions(array $options)
-    {
-        $methods = get_class_methods($this);
-
-        foreach ($options as $key => $value) {
-            $method = 'set' . ucfirst($key);
-
-            if (in_array($method, $methods)) {
-                $this->$method($value);
-
-            }
-        }
-        return $this;
-    }
-
 	public function getUserId() {
 		return $this->userId;
 	}