import os
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from sqlalchemy import create_engine
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import sessionmaker, Session
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from app.config.config import settings
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DATABASE_URL = settings.database_url
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engine = create_engine(DATABASE_URL, pool_size=20, max_overflow=50)
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SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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Base = declarative_base()
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# 创建所有表（如果有新的模型类，会自动创建相应的表）
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def init_db():
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Base.metadata.create_all(bind=engine)
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def get_db():
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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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