diff --git a/stubs/hdbcli/hdbcli/dbapi.pyi b/stubs/hdbcli/hdbcli/dbapi.pyi
index 758b7d4d2..c236a8880 100644
--- a/stubs/hdbcli/hdbcli/dbapi.pyi
+++ b/stubs/hdbcli/hdbcli/dbapi.pyi
@@ -4,13 +4,13 @@ from collections.abc import Sequence
 from datetime import date, datetime, time
 from types import TracebackType
 from typing import Any, overload
-from typing_extensions import Literal, TypeAlias
+from typing_extensions import Literal, Self, TypeAlias
 
 from .resultrow import ResultRow
 
 apilevel: str
 threadsafety: int
-paramstyle: tuple[str, ...]
+paramstyle: tuple[str, ...]  # hdbcli defines it as a tuple which does not follow PEP 249
 connect = Connection
 
 class Connection:
@@ -47,7 +47,7 @@ class LOB:
     def read(self, size: int = ..., position: int = ...) -> str | bytes: ...
     def write(self, object: str | bytes) -> int: ...
 
-_Parameters: TypeAlias = Sequence[tuple[Any, ...]]
+_Parameters: TypeAlias = Sequence[tuple[Any, ...]] | None
 
 class Cursor:
     description: tuple[tuple[Any, ...], ...]
@@ -55,17 +55,17 @@ class Cursor:
     statementhash: str | None
     connection: Connection
     arraysize: int
-    refreshts: Incomplete
+    refreshts: int | None
     maxage: int
     def __init__(self, *args: Any, **kwargs: Any) -> None: ...
-    def __enter__(self) -> Incomplete: ...
+    def __enter__(self) -> Self: ...
     def __exit__(self, typ: type[BaseException] | None, val: BaseException | None, tb: TracebackType | None) -> None: ...
     def callproc(self, procname: str, parameters: tuple[Any, ...] = ..., overview: bool = ...) -> tuple[Any, ...]: ...
     def close(self) -> None: ...
     def description_ext(self) -> Sequence[tuple[Any, ...]]: ...
-    def execute(self, operation: str, parameters: tuple[Any, ...]) -> bool: ...
-    def executemany(self, operation: str, parameters: _Parameters) -> Any: ...
-    def executemanyprepared(self, parameters: _Parameters) -> Any: ...
+    def execute(self, operation: str, parameters: tuple[Any, ...] | None = ...) -> bool: ...
+    def executemany(self, operation: str, parameters: _Parameters = ...) -> Any: ...
+    def executemanyprepared(self, parameters: _Parameters = ...) -> Any: ...
     def executeprepared(self, parameters: _Parameters = ...) -> Any: ...
     def fetchone(self, uselob: bool = ...) -> ResultRow | None: ...
     def fetchall(self) -> list[ResultRow]: ...
diff --git a/stubs/hdbcli/hdbcli/resultrow.pyi b/stubs/hdbcli/hdbcli/resultrow.pyi
index cf0ee12ec..8c3da3881 100644
--- a/stubs/hdbcli/hdbcli/resultrow.pyi
+++ b/stubs/hdbcli/hdbcli/resultrow.pyi
@@ -1,6 +1,15 @@
-from typing import Any
+from collections.abc import Iterator, Sequence
+from typing import Any, overload
 
 class ResultRow:
     def __init__(self, *args: Any, **kwargs: Any) -> None: ...
     column_names: tuple[str, ...]
     column_values: tuple[Any, ...]
+
+    def __len__(self) -> int: ...
+    @overload
+    def __getitem__(self, index: int) -> Any: ...
+    @overload
+    def __getitem__(self, index: slice) -> Sequence[Any]: ...
+    def __iter__(self) -> Iterator[Any]: ...
+    # __next__, __delitem__, __setitem__ are technically defined but lead always to an error