from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from app.utils.config import get_settings

settings = get_settings()

# 创建数据库引擎
engine = create_engine(
    settings.database_url,
    pool_pre_ping=True,  # 自动检测断开的连接并重新连接
    pool_recycle=3600,  # 每小时回收连接
    echo=settings.debug,  # 在调试模式下打印SQL语句
)

# 创建会话工厂
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# 创建Base类，所有模型都将继承这个类
Base = declarative_base()

# 获取数据库会话的依赖函数
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()