313 lines
8.9 KiB
Python
313 lines
8.9 KiB
Python
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# mysql/aiomysql.py
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# Copyright (C) 2005-2021 the SQLAlchemy authors and contributors <see AUTHORS
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# file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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r"""
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.. dialect:: mysql+aiomysql
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:name: aiomysql
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:dbapi: aiomysql
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:connectstring: mysql+aiomysql://user:password@host:port/dbname[?key=value&key=value...]
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:url: https://github.com/aio-libs/aiomysql
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The aiomysql dialect is SQLAlchemy's second Python asyncio dialect.
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Using a special asyncio mediation layer, the aiomysql dialect is usable
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as the backend for the :ref:`SQLAlchemy asyncio <asyncio_toplevel>`
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extension package.
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This dialect should normally be used only with the
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:func:`_asyncio.create_async_engine` engine creation function::
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from sqlalchemy.ext.asyncio import create_async_engine
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engine = create_async_engine("mysql+aiomysql://user:pass@hostname/dbname")
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Unicode
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-------
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Please see :ref:`mysql_unicode` for current recommendations on unicode
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handling.
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""" # noqa
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from .pymysql import MySQLDialect_pymysql
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from ... import pool
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from ... import util
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from ...util.concurrency import asyncio
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from ...util.concurrency import await_fallback
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from ...util.concurrency import await_only
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class AsyncAdapt_aiomysql_cursor:
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server_side = False
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__slots__ = (
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"_adapt_connection",
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"_connection",
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"await_",
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"_cursor",
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"_rows",
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)
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def __init__(self, adapt_connection):
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self._adapt_connection = adapt_connection
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self._connection = adapt_connection._connection
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self.await_ = adapt_connection.await_
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cursor = self._connection.cursor()
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# see https://github.com/aio-libs/aiomysql/issues/543
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self._cursor = self.await_(cursor.__aenter__())
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self._rows = []
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@property
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def description(self):
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return self._cursor.description
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@property
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def rowcount(self):
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return self._cursor.rowcount
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@property
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def arraysize(self):
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return self._cursor.arraysize
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@arraysize.setter
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def arraysize(self, value):
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self._cursor.arraysize = value
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@property
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def lastrowid(self):
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return self._cursor.lastrowid
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def close(self):
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# note we aren't actually closing the cursor here,
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# we are just letting GC do it. to allow this to be async
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# we would need the Result to change how it does "Safe close cursor".
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# MySQL "cursors" don't actually have state to be "closed" besides
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# exhausting rows, which we already have done for sync cursor.
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# another option would be to emulate aiosqlite dialect and assign
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# cursor only if we are doing server side cursor operation.
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self._rows[:] = []
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def execute(self, operation, parameters=None):
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return self.await_(self._execute_async(operation, parameters))
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def executemany(self, operation, seq_of_parameters):
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return self.await_(
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self._executemany_async(operation, seq_of_parameters)
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)
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async def _execute_async(self, operation, parameters):
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async with self._adapt_connection._execute_mutex:
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if parameters is None:
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result = await self._cursor.execute(operation)
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else:
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result = await self._cursor.execute(operation, parameters)
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if not self.server_side:
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# aiomysql has a "fake" async result, so we have to pull it out
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# of that here since our default result is not async.
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# we could just as easily grab "_rows" here and be done with it
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# but this is safer.
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self._rows = list(await self._cursor.fetchall())
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return result
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async def _executemany_async(self, operation, seq_of_parameters):
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async with self._adapt_connection._execute_mutex:
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return await self._cursor.executemany(operation, seq_of_parameters)
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def setinputsizes(self, *inputsizes):
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pass
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def __iter__(self):
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while self._rows:
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yield self._rows.pop(0)
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def fetchone(self):
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if self._rows:
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return self._rows.pop(0)
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else:
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return None
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def fetchmany(self, size=None):
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if size is None:
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size = self.arraysize
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retval = self._rows[0:size]
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self._rows[:] = self._rows[size:]
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return retval
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def fetchall(self):
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retval = self._rows[:]
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self._rows[:] = []
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return retval
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class AsyncAdapt_aiomysql_ss_cursor(AsyncAdapt_aiomysql_cursor):
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__slots__ = ()
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server_side = True
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def __init__(self, adapt_connection):
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self._adapt_connection = adapt_connection
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self._connection = adapt_connection._connection
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self.await_ = adapt_connection.await_
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cursor = self._connection.cursor(
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adapt_connection.dbapi.aiomysql.SSCursor
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)
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self._cursor = self.await_(cursor.__aenter__())
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def close(self):
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if self._cursor is not None:
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self.await_(self._cursor.close())
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self._cursor = None
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def fetchone(self):
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return self.await_(self._cursor.fetchone())
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def fetchmany(self, size=None):
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return self.await_(self._cursor.fetchmany(size=size))
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def fetchall(self):
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return self.await_(self._cursor.fetchall())
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class AsyncAdapt_aiomysql_connection:
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await_ = staticmethod(await_only)
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__slots__ = ("dbapi", "_connection", "_execute_mutex")
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def __init__(self, dbapi, connection):
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self.dbapi = dbapi
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self._connection = connection
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self._execute_mutex = asyncio.Lock()
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def ping(self, reconnect):
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return self.await_(self._connection.ping(reconnect))
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def character_set_name(self):
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return self._connection.character_set_name()
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def autocommit(self, value):
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self.await_(self._connection.autocommit(value))
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def cursor(self, server_side=False):
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if server_side:
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return AsyncAdapt_aiomysql_ss_cursor(self)
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else:
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return AsyncAdapt_aiomysql_cursor(self)
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def rollback(self):
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self.await_(self._connection.rollback())
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def commit(self):
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self.await_(self._connection.commit())
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def close(self):
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# it's not awaitable.
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self._connection.close()
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class AsyncAdaptFallback_aiomysql_connection(AsyncAdapt_aiomysql_connection):
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__slots__ = ()
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await_ = staticmethod(await_fallback)
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class AsyncAdapt_aiomysql_dbapi:
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def __init__(self, aiomysql, pymysql):
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self.aiomysql = aiomysql
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self.pymysql = pymysql
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self.paramstyle = "format"
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self._init_dbapi_attributes()
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def _init_dbapi_attributes(self):
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for name in (
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"Warning",
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"Error",
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"InterfaceError",
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"DataError",
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"DatabaseError",
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"OperationalError",
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"InterfaceError",
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"IntegrityError",
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"ProgrammingError",
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"InternalError",
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"NotSupportedError",
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):
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setattr(self, name, getattr(self.aiomysql, name))
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for name in (
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"NUMBER",
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"STRING",
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"DATETIME",
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"BINARY",
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"TIMESTAMP",
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"Binary",
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):
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setattr(self, name, getattr(self.pymysql, name))
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def connect(self, *arg, **kw):
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async_fallback = kw.pop("async_fallback", False)
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if util.asbool(async_fallback):
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return AsyncAdaptFallback_aiomysql_connection(
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self,
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await_fallback(self.aiomysql.connect(*arg, **kw)),
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)
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else:
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return AsyncAdapt_aiomysql_connection(
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self,
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await_only(self.aiomysql.connect(*arg, **kw)),
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)
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class MySQLDialect_aiomysql(MySQLDialect_pymysql):
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driver = "aiomysql"
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supports_statement_cache = True
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supports_server_side_cursors = True
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_sscursor = AsyncAdapt_aiomysql_ss_cursor
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is_async = True
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@classmethod
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def dbapi(cls):
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return AsyncAdapt_aiomysql_dbapi(
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__import__("aiomysql"), __import__("pymysql")
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)
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@classmethod
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def get_pool_class(cls, url):
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async_fallback = url.query.get("async_fallback", False)
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if util.asbool(async_fallback):
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return pool.FallbackAsyncAdaptedQueuePool
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else:
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return pool.AsyncAdaptedQueuePool
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def create_connect_args(self, url):
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return super(MySQLDialect_aiomysql, self).create_connect_args(
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url, _translate_args=dict(username="user", database="db")
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)
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def is_disconnect(self, e, connection, cursor):
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if super(MySQLDialect_aiomysql, self).is_disconnect(
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e, connection, cursor
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):
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return True
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else:
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str_e = str(e).lower()
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return "not connected" in str_e
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def _found_rows_client_flag(self):
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from pymysql.constants import CLIENT
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return CLIENT.FOUND_ROWS
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dialect = MySQLDialect_aiomysql
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