Provide option to set character_set on drupalConnectionCallback

src/Controller/DrupacleController.php

@@ -37,13 +37,13 @@ class DrupacleController extends ControllerBase {
   /**
    * {@inheritdoc}
    */
-  public function drupalConnectionCallback(DrupacleConnectionInterface $drupacle_connection) {
+  public function drupalConnectionCallback(DrupacleConnectionInterface $drupacle_connection, $character_set = 'utf8') {
     $connectionId = $drupacle_connection->get('id');
     $db_username = $drupacle_connection->get('username');
     $db_password = $drupacle_connection->get('password');
     $getHost = $drupacle_connection->getHostWithPortAndService();
 
-    $oracleDB = oci_connect($db_username, $db_password, $getHost);
+    $oracleDB = oci_connect($db_username, $db_password, $getHost, $character_set);
     if ($oracleDB) {
       $response[$connectionId] = $oracleDB;
     }