Support NULL values for non-string database fields

class.databaserecord.php

@@ -226,6 +226,16 @@ abstract class CPHPDatabaseRecordClass extends CPHPBaseClass
 		
 		$original_value = $this->uData[$column_name];
 		
+		if($original_value === "" && ($type == "timestamp" || $type == "numeric" || $type == "boolean"))
+		{
+			$variable_name_safe = "s" . $variable_name;
+			$this->$variable_name_safe = null;
+			
+			$variable_name_unsafe = "u" . $variable_name;
+			$this->$variable_name_unsafe = null;
+		}
+		else
+		{
 			switch($type)
 			{
 				case "string":
@@ -297,6 +307,7 @@ abstract class CPHPDatabaseRecordClass extends CPHPBaseClass
 			$variable_name_unsafe = "u" . $variable_name;
 			$this->$variable_name_unsafe = $original_value;
 		}
+	}
 	
 	public function FillDefaults()
 	{