我尝试通过以下方法从表中加载特定列：

from sqlalchemy.orm import load_only
from sqlmodel import (Field, Session, SQLModel, create_engine, select)
from models import ( Tx )

engine = create_engine(url, echo=True)

        with Session(engine) as session:
            results = session.exec(select(Tx.Id, Tx.party, Tx.time)
                                   .order_by(Tx
                                             .time
                                             .desc())
                                   ).all()

            myResults = []
            
            for result in results:
                myResults.append(result.toDict())

然而，返回Row类，然后我不能运行toDict()，因为通常我会返回具有该方法的Tx类。希望它清楚我想要什么，我不期望Row类。
然后我尝试使用sqlalchemy方法，然而，这似乎不太好用，因为它返回所有列，不管我过滤的是什么：

from sqlalchemy.orm import load_only
from sqlmodel import (Field, Session, SQLModel, create_engine, select)
from models import ( Tx )

engine = create_engine(url, echo=True)

        with Session(engine) as session:
            results = session.exec(select(Tx)
                                   .options(load_only("id", "party", "time")))
                                   .order_by(Tx
                                             .time
                                             .desc())
                                   ).all()
            myResults = []
            
            for result in results:
                myResults.append(result.toDict())