from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from app.core.config import settings
import pymysql

# 注册 MySQL Python SQL Driver
pymysql.install_as_MySQLdb()

engine = create_engine(
    settings.SQLALCHEMY_DATABASE_URL,
    pool_pre_ping=True,  # 自动处理断开的连接
    pool_recycle=3600,   # 连接回收时间
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()

# 依赖项
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()