Mark Connection::getParams() internal

UPGRADE.md

 # Upgrade to 2.11
 
+## `Connection::getParams()` has been marked internal
+
+Consumers of the Connection class should not rely on connection parameters stored in the connection object. If needed, they should be obtained from a different source, e.g. application configuration.
+
 ## Deprecated `Doctrine\DBAL\Driver::getDatabase()`
 
 - The usage of `Doctrine\DBAL\Driver::getDatabase()` is deprecated. Please use `Doctrine\DBAL\Connection::getDatabase()` instead.

lib/Doctrine/DBAL/Connection.php

@@ -225,6 +225,8 @@ class Connection implements DriverConnection
     /**
      * Gets the parameters used during instantiation.
      *
+     * @internal
+     *
      * @return mixed[]
      */
     public function getParams()
@@ -1199,7 +1201,7 @@ class Connection implements DriverConnection
             throw CacheException::noResultDriverConfigured();
         }
 
-        $connectionParams = $this->getParams();
+        $connectionParams = $this->params;
         unset($connectionParams['platform']);
 
         [$cacheKey, $realKey] = $qcp->generateCacheKeys($query, $params, $types, $connectionParams);

lib/Doctrine/DBAL/Id/TableGenerator.php

@@ -4,6 +4,7 @@ namespace Doctrine\DBAL\Id;
 
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\DBALException;
+use Doctrine\DBAL\Driver;
 use Doctrine\DBAL\DriverManager;
 use Doctrine\DBAL\LockMode;
 use Throwable;
@@ -69,12 +70,16 @@ class TableGenerator
      */
     public function __construct(Connection $conn, $generatorTableName = 'sequences')
     {
-        $params = $conn->getParams();
-        if ($params['driver'] === 'pdo_sqlite') {
+        if ($conn->getDriver() instanceof Driver\PDOSqlite\Driver) {
             throw new DBALException('Cannot use TableGenerator with SQLite.');
         }
 
-        $this->conn               = DriverManager::getConnection($params, $conn->getConfiguration(), $conn->getEventManager());
+        $this->conn = DriverManager::getConnection(
+            $conn->getParams(),
+            $conn->getConfiguration(),
+            $conn->getEventManager()
+        );
+
         $this->generatorTableName = $generatorTableName;
     }