III

src/Driver/Database/mysqli/Connection.php

@@ -220,4 +220,11 @@ protected function driverTransactionManager(): TransactionManagerInterface {
     return new TransactionManager($this);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function startTransaction($name = '') {
+    return $this->transactionManager()->push($name);
+  }
+
 }

src/Driver/Database/mysqli/TransactionManager.php

@@ -9,11 +9,6 @@
 
 /**
  * MySqli implementation of TransactionManagerInterface.
- *
- * MySQL will automatically commit transactions when tables are altered or
- * created (DDL transactions are not supported). However, pdo_mysql tracks
- * whether a client connection is still active and we can prevent triggering
- * exceptions.
  */
 class TransactionManager extends TransactionManagerBase {
 
@@ -24,6 +19,13 @@ protected function beginClientTransaction(): bool {
     return $this->connection->getClientConnection()->begin_transaction();
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function addClientSavepoint(string $name): bool {
+    return $this->connection->getClientConnection()->savepoint($name);
+  }
+
   /**
    * {@inheritdoc}
    */