new error numbering convention

Config.txt

@@ -0,0 +1,6 @@
+=== GLOBAL CONFIGURATIONS ===
+
+== Error Codes ===
+
+= Database.php =
+10101 - SQL request did not give a result

Database.php

@@ -22,11 +22,18 @@ class Database
             $result = pg_query($this->db, $sql);
         }
         if(!$result) {
-            echo json_encode(array("error"=>1));
+            $error = 10101;
-            exit;
         }
-        $arr = pg_fetch_all($result);
+        if(!$error) {
-        return $arr;
+            $data = pg_fetch_all($result);
+        } else {
+            $data = null;
+        }
+        $this->create_response($data, $error);
+    }
+
+    function create_response($data, $error = null){
+        //TODO
     }
 
 }