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# -*- coding: utf-8 -*-
from typing import *
import sqlalchemy . orm
import config
_engine : Optional [ sqlalchemy . Engine ] = None
class OrmBase ( sqlalchemy . orm . DeclarativeBase ) :
pass
def init ( ) :
cfg = config . get_config ( )
global _engine
_engine = sqlalchemy . create_engine (
cfg . database_url ,
pool_size = 5 , # 保持的连接数
max_overflow = 5 , # 临时的额外连接数
pool_timeout = 3 , # 连接数达到最大时获取新连接的超时时间
# pool_pre_ping=True, # 获取连接时先检测是否可用
pool_recycle = 60 * 60 , # 回收超过1小时的连接，
# echo=cfg.debug, # 输出SQL语句
)
OrmBase . metadata . create_all ( _engine )
def get_session ( ) - > sqlalchemy . orm . Session :
return sqlalchemy . orm . Session ( _engine )