Проверка 09.02.2025

venv/Lib/site-packages/sqlalchemy/dialects/mysql/asyncmy.py

@@ -1,5 +1,5 @@
 # dialects/mysql/asyncmy.py
-# Copyright (C) 2005-2024 the SQLAlchemy authors and contributors <see AUTHORS
+# Copyright (C) 2005-2025 the SQLAlchemy authors and contributors <see AUTHORS
 # file>
 #
 # This module is part of SQLAlchemy and is released under
@@ -21,10 +21,13 @@ This dialect should normally be used only with the
 :func:`_asyncio.create_async_engine` engine creation function::
 
     from sqlalchemy.ext.asyncio import create_async_engine
-    engine = create_async_engine("mysql+asyncmy://user:pass@hostname/dbname?charset=utf8mb4")
 
+    engine = create_async_engine(
+        "mysql+asyncmy://user:pass@hostname/dbname?charset=utf8mb4"
+    )
 
 """  # noqa
+from collections import deque
 from contextlib import asynccontextmanager
 
 from .pymysql import MySQLDialect_pymysql
@@ -56,7 +59,7 @@ class AsyncAdapt_asyncmy_cursor:
         cursor = self._connection.cursor()
 
         self._cursor = self.await_(cursor.__aenter__())
-        self._rows = []
+        self._rows = deque()
 
     @property
     def description(self):
@@ -86,7 +89,7 @@ class AsyncAdapt_asyncmy_cursor:
         # exhausting rows, which we already have done for sync cursor.
         # another option would be to emulate aiosqlite dialect and assign
         # cursor only if we are doing server side cursor operation.
-        self._rows[:] = []
+        self._rows.clear()
 
     def execute(self, operation, parameters=None):
         return self.await_(self._execute_async(operation, parameters))
@@ -108,7 +111,7 @@ class AsyncAdapt_asyncmy_cursor:
                 # of that here since our default result is not async.
                 # we could just as easily grab "_rows" here and be done with it
                 # but this is safer.
-                self._rows = list(await self._cursor.fetchall())
+                self._rows = deque(await self._cursor.fetchall())
             return result
 
     async def _executemany_async(self, operation, seq_of_parameters):
@@ -120,11 +123,11 @@ class AsyncAdapt_asyncmy_cursor:
 
     def __iter__(self):
         while self._rows:
-            yield self._rows.pop(0)
+            yield self._rows.popleft()
 
     def fetchone(self):
         if self._rows:
-            return self._rows.pop(0)
+            return self._rows.popleft()
         else:
             return None
 
@@ -132,13 +135,12 @@ class AsyncAdapt_asyncmy_cursor:
         if size is None:
             size = self.arraysize
 
-        retval = self._rows[0:size]
-        self._rows[:] = self._rows[size:]
-        return retval
+        rr = self._rows
+        return [rr.popleft() for _ in range(min(size, len(rr)))]
 
     def fetchall(self):
-        retval = self._rows[:]
-        self._rows[:] = []
+        retval = list(self._rows)
+        self._rows.clear()
         return retval