diff --git a/inc/Db.php b/inc/Db.php
index 15cdbcb..9a51219 100644
--- a/inc/Db.php
+++ b/inc/Db.php
@@ -270,7 +270,7 @@ class Db extends PhpObject
 		return $asResult;
 	}
 
-	private function getMaxIncrementedValue($sTable)
+	public function getMaxIncrementedValue($sTable)
 	{
 		return $this->selectValue($sTable, "MAX(".$this->getId($sTable).")");
 	}
@@ -293,7 +293,7 @@ class Db extends PhpObject
 		return $sTableName.".".$sColumnName;
 	}
 
-	private function isId($sColumnName, $sTableName='')
+	public function isId($sColumnName, $sTableName='')
 	{
 		$asTables = ($sTableName=='')?$this->getTables():array($sTableName);
 		$asTableIds = array_map(array('self', 'getId'), $asTables);