# coding:utf-8 import threading import pymysql from DBUtils.PooledDB import PooledDB from app.common.file_config import get_config class DbPool(object): _instance_lock = threading.Lock() def __init__(self): if not hasattr(DbPool, "pool"): DbPool.mysql_pool() else: pass def __new__(cls, *args, **kwargs): if not hasattr(DbPool, "_instance"): with DbPool._instance_lock: if not hasattr(DbPool, "_instance"): DbPool._instance = object.__new__(cls, *args, **kwargs) return DbPool._instance @staticmethod def mysql_pool(): host = get_config(‘database‘, ‘MYSQL_HOST‘) port = int(get_config(‘database‘, ‘MYSQL_PORT‘)) user = get_config(‘database‘, ‘MYSQL_USERNAME‘) passwd = get_config(‘database‘, ‘MYSQL_PASSWORD‘) db = get_config(‘database‘, ‘MYSQL_DB‘) DbPool.pool = PooledDB( creator=pymysql, # 使用链接数据库的模块 mincached=2, # 初始化时,链接池中至少创建的空闲的链接,0表示不创建 maxcached=6, # 链接池中最多闲置的链接,0和None不限制 maxshared=3, # 链接池中最多共享的链接数量,0和None表示全部共享。PS: 无用,因为pymysql和MySQLdb等模块的 threadsafety都为1,所有值无论设置为多少,_maxcached永远为0,所以永远是所有链接都共享。 maxconnections=8, # 连接池允许的最大连接数,0和None表示不限制连接数 blocking=True, # 连接池中如果没有可用连接后,是否阻塞等待。True,等待;False,不等待然后报错 maxusage=None, # 一个链接最多被重复使用的次数,None表示无限制 setsession=None, # 开始会话前执行的命令列表。如:["set datestyle to ...", "set time zone ..."] # ping MySQL服务端,检查是否服务可用。# 如:0 = None = never, 1 = default = whenever it is requested, 2 = when a cursor is created, 4 = when a query is executed, 7 = always host=host, port=port, user=user, passwd=passwd, db=db, use_unicode=False, charset=‘utf8‘ )
原文地址:https://www.cnblogs.com/feiyun126/p/8277091.html
时间: 2024-09-30 07:00:49