## BC BREAK: Changes in the `Doctrine\DBAL\Connection` API
- The following methods have been removed as leaking internal implementation details: `::getHost()`, `::getPort()`, `::getUsername()`, `::getPassword()`.
- The `::getDatabase()` method can now return null which means that no database is currently selected.
## BC BREAK: Changes in `Doctrine\DBAL\Driver\SQLSrv\LastInsertId`
- The class stores the last inserted ID as a nullable string, not an integer, which is reflected in the method signatures.
## BC BREAK: Changes in the `Doctrine\DBAL\Schema` API
- Method `Doctrine\DBAL\Schema\AbstractSchemaManager::_getPortableViewDefinition()` no longer optionally returns false. It will always return a `Doctrine\DBAL\Schema\View` instance.