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aiomysql.py

# dialects/mysql/aiomysql.py
# Copyright (C) 2005-2025 the SQLAlchemy authors and contributors <see AUTHORS
# file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: https://www.opensource.org/licenses/mit-license.php
# mypy: ignore-errors

r"""
.. dialect:: mysql+aiomysql
    :name: aiomysql
    :dbapi: aiomysql
    :connectstring: mysql+aiomysql://user:password@host:port/dbname[?key=value&key=value...]
    :url: https://github.com/aio-libs/aiomysql

The aiomysql dialect is SQLAlchemy's second Python asyncio dialect.

Using a special asyncio mediation layer, the aiomysql dialect is usable
as the backend for the :ref:`SQLAlchemy asyncio <asyncio_toplevel>`
extension package.

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+aiomysql://user:pass@hostname/dbname?charset=utf8mb4"
    )

"""  # noqa
from collections import deque

from .pymysql import MySQLDialect_pymysql
from ... import pool
from ... import util
from ...engine import AdaptedConnection
from ...util.concurrency import asyncio
from ...util.concurrency import await_fallback
from ...util.concurrency import await_only

class AsyncAdapt_aiomysql_cursor:
    # TODO: base on connectors/asyncio.py
    # see #10415
    server_side = False
    __slots__ = (
        "_adapt_connection",
        "_connection",
        "await_",
        "_cursor",
        "_rows",
    )

def __init__(self, adapt_connection):
        self._adapt_connection = adapt_connection
        self._connection = adapt_connection._connection
        self.await_ = adapt_connection.await_

cursor = self._connection.cursor(adapt_connection.dbapi.Cursor)

# see https://github.com/aio-libs/aiomysql/issues/543
        self._cursor = self.await_(cursor.__aenter__())
        self._rows = deque()

@property
    def description(self):
        return self._cursor.description

@property
    def rowcount(self):
        return self._cursor.rowcount

@property
    def arraysize(self):
        return self._cursor.arraysize

@arraysize.setter
    def arraysize(self, value):
        self._cursor.arraysize = value

@property
    def lastrowid(self):
        return self._cursor.lastrowid

def close(self):
        # note we aren't actually closing the cursor here,
        # we are just letting GC do it.   to allow this to be async
        # we would need the Result to change how it does "Safe close cursor".
        # MySQL "cursors" don't actually have state to be "closed" besides
        # 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.clear()

def execute(self, operation, parameters=None):
        return self.await_(self._execute_async(operation, parameters))

def executemany(self, operation, seq_of_parameters):
        return self.await_(
            self._executemany_async(operation, seq_of_parameters)
        )

async def _execute_async(self, operation, parameters):
        async with self._adapt_connection._execute_mutex:
            result = await self._cursor.execute(operation, parameters)

if not self.server_side:
                # aiomysql has a "fake" async result, so we have to pull it out
                # 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 = deque(await self._cursor.fetchall())
            return result

async def _executemany_async(self, operation, seq_of_parameters):
        async with self._adapt_connection._execute_mutex:
            return await self._cursor.executemany(operation, seq_of_parameters)

def setinputsizes(self, *inputsizes):
        pass

def __iter__(self):
        while self._rows:
            yield self._rows.popleft()

def fetchone(self):
        if self._rows:
            return self._rows.popleft()
        else:
            return None

def fetchmany(self, size=None):
        if size is None:
            size = self.arraysize

rr = self._rows
        return [rr.popleft() for _ in range(min(size, len(rr)))]

def fetchall(self):
        retval = list(self._rows)
        self._rows.clear()
        return retval

class AsyncAdapt_aiomysql_ss_cursor(AsyncAdapt_aiomysql_cursor):
    # TODO: base on connectors/asyncio.py
    # see #10415
    __slots__ = ()
    server_side = True

def __init__(self, adapt_connection):
        self._adapt_connection = adapt_connection
        self._connection = adapt_connection._connection
        self.await_ = adapt_connection.await_

cursor = self._connection.cursor(adapt_connection.dbapi.SSCursor)

self._cursor = self.await_(cursor.__aenter__())

def close(self):
        if self._cursor is not None:
            self.await_(self._cursor.close())
            self._cursor = None

def fetchone(self):
        return self.await_(self._cursor.fetchone())

def fetchmany(self, size=None):
        return self.await_(self._cursor.fetchmany(size=size))

def fetchall(self):
        return self.await_(self._cursor.fetchall())

class AsyncAdapt_aiomysql_connection(AdaptedConnection):
    # TODO: base on connectors/asyncio.py
    # see #10415
    await_ = staticmethod(await_only)
    __slots__ = ("dbapi", "_execute_mutex")

def __init__(self, dbapi, connection):
        self.dbapi = dbapi
        self._connection = connection
        self._execute_mutex = asyncio.Lock()

def ping(self, reconnect):
        return self.await_(self._connection.ping(reconnect))

def character_set_name(self):
        return self._connection.character_set_name()

def autocommit(self, value):
        self.await_(self._connection.autocommit(value))

def cursor(self, server_side=False):
        if server_side:
            return AsyncAdapt_aiomysql_ss_cursor(self)
        else:
            return AsyncAdapt_aiomysql_cursor(self)

def rollback(self):
        self.await_(self._connection.rollback())

def commit(self):
        self.await_(self._connection.commit())

def terminate(self):
        # it's not awaitable.
        self._connection.close()

def close(self) -> None:
        self.await_(self._connection.ensure_closed())

class AsyncAdaptFallback_aiomysql_connection(AsyncAdapt_aiomysql_connection):
    # TODO: base on connectors/asyncio.py
    # see #10415
    __slots__ = ()

await_ = staticmethod(await_fallback)

class AsyncAdapt_aiomysql_dbapi:
    def __init__(self, aiomysql, pymysql):
        self.aiomysql = aiomysql
        self.pymysql = pymysql
        self.paramstyle = "format"
        self._init_dbapi_attributes()
        self.Cursor, self.SSCursor = self._init_cursors_subclasses()

def _init_dbapi_attributes(self):
        for name in (
            "Warning",
            "Error",
            "InterfaceError",
            "DataError",
            "DatabaseError",
            "OperationalError",
            "InterfaceError",
            "IntegrityError",
            "ProgrammingError",
            "InternalError",
            "NotSupportedError",
        ):
            setattr(self, name, getattr(self.aiomysql, name))

for name in (
            "NUMBER",
            "STRING",
            "DATETIME",
            "BINARY",
            "TIMESTAMP",
            "Binary",
        ):
            setattr(self, name, getattr(self.pymysql, name))

def connect(self, *arg, **kw):
        async_fallback = kw.pop("async_fallback", False)
        creator_fn = kw.pop("async_creator_fn", self.aiomysql.connect)

if util.asbool(async_fallback):
            return AsyncAdaptFallback_aiomysql_connection(
                self,
                await_fallback(creator_fn(*arg, **kw)),
            )
        else:
            return AsyncAdapt_aiomysql_connection(
                self,
                await_only(creator_fn(*arg, **kw)),
            )

def _init_cursors_subclasses(self):
        # suppress unconditional warning emitted by aiomysql
        class Cursor(self.aiomysql.Cursor):
            async def _show_warnings(self, conn):
                pass

class SSCursor(self.aiomysql.SSCursor):
            async def _show_warnings(self, conn):
                pass

return Cursor, SSCursor

class MySQLDialect_aiomysql(MySQLDialect_pymysql):
    driver = "aiomysql"
    supports_statement_cache = True

supports_server_side_cursors = True
    _sscursor = AsyncAdapt_aiomysql_ss_cursor

is_async = True
    has_terminate = True

@classmethod
    def import_dbapi(cls):
        return AsyncAdapt_aiomysql_dbapi(
            __import__("aiomysql"), __import__("pymysql")
        )

@classmethod
    def get_pool_class(cls, url):
        async_fallback = url.query.get("async_fallback", False)

if util.asbool(async_fallback):
            return pool.FallbackAsyncAdaptedQueuePool
        else:
            return pool.AsyncAdaptedQueuePool

def do_terminate(self, dbapi_connection) -> None:
        dbapi_connection.terminate()

def create_connect_args(self, url):
        return super().create_connect_args(
            url, _translate_args=dict(username="user", database="db")
        )

def is_disconnect(self, e, connection, cursor):
        if super().is_disconnect(e, connection, cursor):
            return True
        else:
            str_e = str(e).lower()
            return "not connected" in str_e

def _found_rows_client_flag(self):
        from pymysql.constants import CLIENT

return CLIENT.FOUND_ROWS

def get_driver_connection(self, connection):
        return connection._connection

dialect = MySQLDialect_aiomysql

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-04-04 08:00:46
..	dir	-	0755	2025-04-04 08:00:45
__pycache__	dir	-	0755	2025-04-04 08:00:46
__init__.py	text/x-script.python	2.15 KB	0644	2025-04-04 08:00:45
aiomysql.py	text/x-script.python	9.78 KB	0644	2025-04-04 08:00:45
asyncmy.py	text/x-script.python	9.84 KB	0644	2025-04-04 08:00:45
base.py	text/plain	121.57 KB	0644	2025-04-04 08:00:45
cymysql.py	text/x-script.python	2.25 KB	0644	2025-04-04 08:00:45
dml.py	text/x-script.python	7.59 KB	0644	2025-04-04 08:00:45
enumerated.py	text/x-script.python	8.25 KB	0644	2025-04-04 08:00:45
expression.py	text/x-script.python	4.02 KB	0644	2025-04-04 08:00:45
json.py	text/x-script.python	2.22 KB	0644	2025-04-04 08:00:45
mariadb.py	text/x-script.python	1.42 KB	0644	2025-04-04 08:00:45
mariadbconnector.py	text/x-script.python	8.42 KB	0644	2025-04-04 08:00:45
mysqlconnector.py	text/x-script.python	5.59 KB	0644	2025-04-04 08:00:45
mysqldb.py	text/x-script.python	9.3 KB	0644	2025-04-04 08:00:45
provision.py	text/x-script.python	3.49 KB	0644	2025-04-04 08:00:45
pymysql.py	text/x-script.python	3.99 KB	0644	2025-04-04 08:00:45
pyodbc.py	text/x-script.python	4.2 KB	0644	2025-04-04 08:00:45
reflection.py	text/x-script.python	22.3 KB	0644	2025-04-04 08:00:45
reserved_words.py	text/plain	9.04 KB	0644	2025-04-04 08:00:45
types.py	text/x-script.python	23.77 KB	0644	2025-04-04 08:00:45