from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, Session
from models import Base
import os

# 数据库配置
DATABASE_URL = os.getenv('DATABASE_URL', 'sqlite:///worklist.db')

# 创建引擎
engine = create_engine(
    DATABASE_URL,
    connect_args={"check_same_thread": False} if DATABASE_URL.startswith('sqlite') else {},
    echo=False
)

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

def init_db():
    """初始化数据库"""
    Base.metadata.create_all(bind=engine)

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