- Added identifier escaping to match differents PDO drivers

src/Adapter/AdapterInterface.php

@@ -5,7 +5,13 @@ namespace Ulmus\Adapter;
 use Ulmus\Common\PdoObject;
 
 interface AdapterInterface {
+    public const IDENTIFIER_FIELD = 1;
+    public const IDENTIFIER_TABLE = 2;
+    public const IDENTIFIER_DATABASE = 3;
+    public const IDENTIFIER_SCHEMA = 4;
+    
     public function connect() : PdoObject;
     public function buildDataSourceName() : string;
     public function setup(array $configuration) : void;
+    public function escapeIdentifier(string $segment, int $type) : string;
 }