python定时发送数据库备份文件到邮箱

下面的代码能实现基本的功能。有一些参数需要改成自己的，比如数据库连接参数和邮箱相关的参数。

 

#定时相关
import datetime
import schedule #定时器
import threading#多线程
#数据库相关
import time
import csv
import codecs
import pymysql#mysql
#邮件相关
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart 
import smtplib
import os,sys

Last_backup_date=datetime.datetime.now()+datetime.timedelta(days=-1);#最后备份日期（初始值为当前时间减去1天）
#time_array=[13,20]#每天的备份时间（24小时制，例：下午1点30分备份【time_array=[13,30]】）
backups=True#可以备份
tim=100#循环的时间
sql='select * from ?'
mail_from='**********@qq.com'                           #发送方邮箱
mail_pass='**********'                                  #填入发送方邮箱的授权码
to_list='**********@qq.com'                             #收件人邮箱

    
def sendmail_backups(mail_from,to_list,subject,content,filename):#发件人，收件人，主题，正文，附件
    msg = MIMEMultipart('related') ##采用related定义内嵌资源的邮件体
    msgtext = MIMEText(content,_subtype='plain',_charset='utf-8') ##_subtype有plain,html等格式，避免使用错误
    msg.attach(msgtext)
    attach = MIMEText(open(filename,'rb').read(), 'base64', 'utf-8') 
    attach["Content-Type"] = 'application/octet-stream'
    attach.add_header("Content-Disposition", "attachment", filename=("gbk", "", filename))
    msg.attach(attach)
    msg['Subject'] = subject
    msg['From'] = mail_from
    msg['To'] = to_list
    return msg

 
def sendMail(msg):
        try:
                server = smtplib.SMTP_SSL("smtp.qq.com",465)
                print ('连接邮箱服务器成功')
                server.login(mail_from, mail_pass)  
                print ('登陆成功')  
                print ('发送邮件中')    
                server.sendmail(mail_from, msg['To'], msg.as_string())  
                server.quit() ##断开smtp连接
                print ("邮件发送成功")
        except Exception.e:
                print ("失败"+str(e))

def get_conn():
    conn = pymysql.connect(host='数据库主机',port=端口,user='用户名',password='密码',db='数据库',charset='utf8')
    return conn

def query_all(cur,sql,args):#执行sql
    cur.execute(sql,args)
    return cur.fetchall()
    
def read_mysql_to_csv(filename):#获取备份CSV文件
    print(filename)
    with codecs.open(filename=filename,mode='w',encoding='utf-8') as f:
        write=csv.writer(f,dialect='excel')
        conn=get_conn()
        cur=conn.cursor()
        results=query_all(cur = cur, sql=sql, args=None)
        for result in results:
            #print(result)
            write.writerow(result)
    msg=sendmail_backups(mail_from,to_list,str(datetime.datetime.now().date())+'【备份邮件】','这是'+sql+'语句的数据库备份文件',filename)
    sendMail(msg)
        
def job():#备份任务
    global backups
    global Last_backup_date
    backups=False#锁定备份
    sname=str(datetime.datetime.now().date())+'.csv'
    read_mysql_to_csv(sname)
    print(str(datetime.datetime.now())+'   '+sname+'    备份成功！')
    Last_backup_date=datetime.datetime.now()
    backups=True#解锁备份
    
def job_task():
    if Last_backup_date.date()!=datetime.datetime.now().date():#最后备份日期不是今天
        if backups:
             threading.Thread(target=job).start()
        else:
            print('正在执行备份，备份任务锁定中！')
    else:
        print('今天已备份，无需再次备份！')
        
def run():
    job_task()
    schedule.every(tim).seconds.do(job_task)
    while True:
        schedule.run_pending()
if __name__ == '__main__':
    print('程序运行时间:'+str(datetime.datetime.now()))
    run()

 

效果图

 

更新：刚刚发现上面写的有问题，会大量占用cpu资源，导致系统卡顿。修改成下面的，上面的代码我也就不删了，供其它人参考。

def run():
    while True:
        job_task()
        time.sleep(tim)