Mark non-interface OCI8 driver methods internal

UPGRADE.md

@@ -1,5 +1,12 @@
 # Upgrade to 2.11
 
+## Non-interface driver methods have been marked internal
+
+The non-interface methods of driver-level classes have been marked internal:
+
+- `OCI8Connection::getExecuteMode()`
+- `OCI8Statement::convertPositionalToNamedPlaceholders()`
+
 ## Inconsistently and ambiguously named driver-level classes are deprecated
 
 The following classes under the `Driver` namespace have been deprecated in favor of their consistently named counterparts:

lib/Doctrine/DBAL/Driver/OCI8/OCI8Connection.php

@@ -176,6 +176,8 @@ public function lastInsertId($name = null)
     /**
      * Returns the current execution mode.
      *
+     * @internal
+     *
      * @return int
      */
     public function getExecuteMode()

lib/Doctrine/DBAL/Driver/OCI8/OCI8Statement.php

@@ -133,6 +133,8 @@ public function __construct($dbh, $query, OCI8Connection $conn)
      * Question marks inside literal strings are therefore handled correctly by this method.
      * This comes at a cost, the whole sql statement has to be looped over.
      *
+     * @internal
+     *
      * @param string $statement The SQL statement to convert.
      *
      * @return mixed[] [0] => the statement value (string), [1] => the paramMap value (array).