1  from typing import Any, Dict, Iterable, List, Optional
 2  
 3  DEFAULT_DB_ALIAS: str
 4  DJANGO_VERSION_PICKLE_KEY: str
 5  
 6  class Error(Exception): ...
 7  class InterfaceError(Error): ...
 8  class DatabaseError(Error): ...
 9  class DataError(DatabaseError): ...
10  class OperationalError(DatabaseError): ...
11  class IntegrityError(DatabaseError): ...
12  class InternalError(DatabaseError): ...
13  class ProgrammingError(DatabaseError): ...
14  class NotSupportedError(DatabaseError): ...
15  
16  def load_backend(backend_name: str) -> Any: ...
17  
18  class ConnectionDoesNotExist(Exception): ...
19  
20  class ConnectionHandler:
21      databases: Dict[str, Dict[str, Optional[Any]]]
22      def __init__(self, databases: Dict[str, Dict[str, Optional[Any]]] = ...) -> None: ...
23      def ensure_defaults(self, alias: str) -> None: ...
24      def prepare_test_settings(self, alias: str) -> None: ...
25      def __getitem__(self, alias: str) -> Any: ...
26      def __setitem__(self, key: Any, value: Any) -> None: ...
27      def __delitem__(self, key: Any) -> None: ...
28      def __iter__(self): ...
29      def all(self) -> List[Any]: ...
30      def close_all(self) -> None: ...
31  
32  class ConnectionRouter:
33      def __init__(self, routers: Optional[Iterable[Any]] = ...) -> None: ...
34      @property
35      def routers(self) -> List[Any]: ...