Langchain-Chatchat/server/db/base.py

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base, DeclarativeMeta
from sqlalchemy.orm import sessionmaker

from configs import SQLALCHEMY_DATABASE_URI
import json


engine = create_engine(
    SQLALCHEMY_DATABASE_URI,
    json_serializer=lambda obj: json.dumps(obj, ensure_ascii=False),
)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base: DeclarativeMeta = declarative_base()