61 lines
1.5 KiB
Python
61 lines
1.5 KiB
Python
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"""SQLAlchemy 引擎与会话。"""
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from __future__ import annotations
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from contextlib import contextmanager
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from typing import Generator
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from sqlalchemy import create_engine, event, text
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from sqlalchemy.orm import Session, declarative_base, sessionmaker
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from as_platform.config import DATABASE_URL, IS_POSTGRES, IS_SQLITE
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connect_args: dict = {}
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engine_kwargs: dict = {"future": True}
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if IS_SQLITE:
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connect_args["check_same_thread"] = False
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elif IS_POSTGRES:
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engine_kwargs.update(pool_pre_ping=True, pool_size=5, max_overflow=10)
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engine = create_engine(DATABASE_URL, connect_args=connect_args, **engine_kwargs)
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SessionLocal = sessionmaker(bind=engine, autocommit=False, autoflush=False, future=True)
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Base = declarative_base()
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@event.listens_for(engine, "connect")
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def _on_connect(dbapi_conn, _):
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if IS_SQLITE:
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cursor = dbapi_conn.cursor()
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cursor.execute("PRAGMA foreign_keys=ON")
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cursor.close()
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def check_connection() -> bool:
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try:
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with engine.connect() as conn:
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conn.execute(text("SELECT 1"))
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return True
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except Exception:
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return False
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@contextmanager
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def session_scope() -> Generator[Session, None, None]:
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db = SessionLocal()
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try:
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yield db
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db.commit()
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except Exception:
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db.rollback()
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raise
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finally:
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db.close()
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def get_db() -> Generator[Session, None, None]:
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db = SessionLocal()
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try:
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yield db
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finally:
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db.close()
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