add tupleCursor and type dictCursor

Author: Polandia94

src/snowflake/connector/connection.py

@@ -25,7 +25,7 @@
 from threading import Lock
 from time import strptime
 from types import TracebackType
-from typing import Any, Callable, Generator, Iterable, Iterator, NamedTuple, Sequence
+from typing import Any, Callable, Generator, Iterable, Iterator, NamedTuple, Sequence, TypeVar
 from uuid import UUID
 
 from cryptography.hazmat.backends import default_backend
@@ -115,6 +115,7 @@
 DEFAULT_CLIENT_PREFETCH_THREADS = 4
 MAX_CLIENT_PREFETCH_THREADS = 10
 DEFAULT_BACKOFF_POLICY = exponential_backoff()
+T = TypeVar('T', bound=SnowflakeCursor)
 
 
 def DefaultConverterClass() -> type:
@@ -869,8 +870,8 @@ def rollback(self) -> None:
         self.cursor().execute("ROLLBACK")
 
     def cursor(
-        self, cursor_class: type[SnowflakeCursor] = SnowflakeCursor
-    ) -> SnowflakeCursor:
+        self, cursor_class: type[T] = SnowflakeCursor
+    ) -> T:
         """Creates a cursor object. Each statement will be executed in a new cursor object."""
         logger.debug("cursor")
         if not self.rest:

src/snowflake/connector/cursor.py

@@ -1728,13 +1728,38 @@ def get_result_batches(self) -> list[ResultBatch] | None:
 
 class DictCursor(SnowflakeCursor):
     """Cursor returning results in a dictionary."""
-
     def __init__(self, connection) -> None:
         super().__init__(
             connection,
             use_dict_result=True,
         )
 
+    def fetchone(self) -> dict | None:
+        return super().fetchone()
+    
+    def fetchmany(self, size: int | None = None) -> list[dict]:
+        return super().fetchmany()
+    
+    def fetchall(self) -> list[dict]:
+        return super().fetchall()
+
+class TupleCursor(SnowflakeCursor):
+    """Cursor returning results in a dictionary."""
+
+    def __init__(self, connection) -> None:
+        super().__init__(
+            connection,
+            use_dict_result=False,
+        )
+
+    def fetchone(self) -> tuple | None:
+        return super().fetchone()
+    
+    def fetchmany(self, size: int | None = None) -> list[tuple]:
+        return super().fetchmany()
+    
+    def fetchall(self) -> list[tuple]:
+        return super().fetchall()
 
 def __getattr__(name):
     if name == "NanoarrowUsage":