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【DM版本】: DM8,sqlalchemy2.0+
【操作系统】：
【CPU】:
【问题描述】*：达梦驱动在sqlalchemy2.0 中 不支持异步
解决方案：（伪异步，仅支持 await语法）

import asyncio
from typing import Optional, Type, Any

from sqlalchemy import create_engine, select
from sqlalchemy.orm import Session
from sqlalchemy.ext.asyncio import async_sessionmaker, AsyncSession


class CustomAsyncSession(AsyncSession):

    def __init__(
            self,
            bind= None,
            *,
            sync_session_class: Optional[Type[Session]] = None,
            **kw: Any,
    ):

        if sync_session_class:
            self.sync_session_class = sync_session_class

        self.sync_session = self._proxied = self._assign_proxied(
            self.sync_session_class(bind=bind, binds=None, **kw)
        )
SQLALCHEMY_DATABASE_URL = 'dm+dmPython://SYSDBA:xxx@127.0.0.1:30236'

engine_sync = create_engine(
    url=SQLALCHEMY_DATABASE_URL,
    pool_recycle=300,
    pool_size=20,
    max_overflow=15,
    pool_timeout=15,
    echo=False)

session_maker: async_sessionmaker[AsyncSession] = async_sessionmaker(bind=engine_sync, autoflush=False, autocommit=False, class_=CustomAsyncSession)

async def main():
    async with session_maker() as session:
        from model.model_info import ModelInfo
        query = select(ModelInfo.id, ModelInfo.create_time).limit(1)
        res = await session.execute(query)
        print(res.fetchall())


if __name__ == '__main__':
    asyncio.run(main())