convert fetchColumn result to string

Author: sarven

lib/Doctrine/DBAL/Driver/PDOSqlsrv/PDOSqlsrvConnection.php

@@ -92,7 +92,7 @@ public function lastInsertId($name = null)
         $stmt = $this->prepare('SELECT CONVERT(VARCHAR(MAX), current_value) FROM sys.sequences WHERE name = ?');
         $stmt->execute([$name]);
 
-        return $stmt->fetchColumn();
+        return (string) $stmt->fetchColumn();
     }
 
     /**

lib/Doctrine/DBAL/Driver/SQLSrv/SQLSrvConnection.php

@@ -149,7 +149,7 @@ public function lastInsertId($name = null)
 
         $stmt = $this->query('SELECT @@IDENTITY');
 
-        return $stmt->fetchColumn();
+        return (string) $stmt->fetchColumn();
     }
 
     /**