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from sqlalchemy import create_engine
from sqlalchemy . orm import sessionmaker
from config . settings import DB_CONFIG
from urllib . parse import quote_plus
DATABASE_URL = (
f " mysql+pymysql:// { DB_CONFIG [ ' user ' ] } : { quote_plus ( DB_CONFIG [ ' password ' ] ) } "
f " @ { DB_CONFIG [ ' host ' ] } : { DB_CONFIG [ ' port ' ] } / { DB_CONFIG [ ' database ' ] } "
)
engine = create_engine (
DATABASE_URL ,
pool_size = 5 , # 默认 5，
max_overflow = 20 , # 超过 pool_size 后最大溢出连接数
pool_timeout = 30 , # 等待连接的超时时间
pool_recycle = 1800 , # 防止 MySQL server timeout
pool_pre_ping = True # 检查连接是否可用
)
SessionLocal = sessionmaker ( bind = engine , autoflush = False , autocommit = False )