timeBetweenEvictionRunsMillis和minEvictableIdleTimeMillis一起使用,每timeBetweenEvictionRunsMillis毫秒检查一次连接池中空闲的连接, 把空闲时间超过minEvictableIdleTimeMillis毫秒的连接断开,直到连接池中的连接数到minIdle为止主要把这两个参数加上就好。 7.validationQueryTimeout validationQueryTimeout仅控制validationQuery的...
self.host = host self.database = database self.max_idle_time = float(max_idle_time) args = dict(use_unicode=True, charset=charset, database=database, init_command=('SET time_zone = "%s"' % time_zone), cursorclass=pymysql.cursors.DictCursor, connect_timeout=connect_timeout, sql_mod...
# print(th, '链接被拿走了', conn1._con) # print(th, '池子里目前有', pool._idle_cache, '\r\n') cursor = conn.cursor() cursor.execute('select * from user') result = cursor.fetchall() print(result) conn.close() if __name__ == '__main__': func() 转载地址 官方文档 参考...
conn=POOL.connection()# print(th, '链接被拿走了', conn1._con)# print(th, '池子里目前有', pool._idle_cache, '\r\n')cursor=conn.cursor()cursor.execute('select * from tb1')result=cursor.fetchall()conn.close()func() 如果没有连接池,使用pymysql来连接数据库时,单线程应用完全没有问题,...
MySQL (and MariaDB) servers are configured to drop connections that have been idle for 8 hours, which can result in an error like2013:LostconnectiontoMySQLserverduringquery. A defaultpool_recyclevalue of 2 hours (7200 seconds) is used to recreate connections before that timeout. ...
The primary cause of this error is that the MySQL connection has timed out and has been closed by the server. The MySQL server closes connections which have been idle a period of time which defaults to eight hours. To accommodate this, the immediate setting is to enable the create_engine....
EN在 Python 中，一般情况下我们可能直接用自带的 logging 模块来记录日志，包括我之前的时候也是一样。在使用时我们需要配置一些 Handler、Formatter 来进行一些处理，比如把日志输出到不同的位置，或者设置一个不同的输出格式，或者设置日志分块和备份。但其实个人感觉 logging 用起来其实并不是那么好用，其实主要还是...
sqlalchemy.exc.OperationalError: (MySQLdb._exceptions.OperationalError) (4031, 'The client was disconnected by the server because of inactivity. See wait_timeout and interactive_timeout for configuring this behavior.') (Background on this error at: https://sqlalche.me/e/20/e3q8) ...
...浏览器的事件循环 主线程从任务队列中读取事件,这个过程是循环不断的,所以整个的这种运行机制又称为Event Loop(事件循环) 上图过程是一个宏观的表述,实际上callback queue任务队列是分为...如fs.readFile()方法 idle, prepare阶段 仅在内部使用,我们暂时不用关注 poll阶段 检索新的I/O事件,执行与I/O相关...
OpenStack Common DB Code. Mirror of code maintained at opendev.org. - oslo.db/oslo_db/sqlalchemy/engines.py at master · openstack/oslo.db