python制作mysql数据迁移脚本


						用python写了个数据迁移脚本，主要是利用从库将大的静态表导出表空间，载导入到目标实例中。





#!/usr/bin/env python3

#-*- coding:utf8 -*-

#author：zhanbin.liu

#!!!!!DB必须同版本

#python3环境  pip3 install pymysql paramiko



import os

#from pathlib import Path

import sys

import pymysql

import paramiko



#每次只能迁移一个DB下的表，到指定DB

#GRANT SELECT, CREATE, RELOAD, ALTER, LOCK TABLES ON *.* TO 'data_migration'@'192.168.%' IDENTIFIED BY 'data_migration@123';

tables='sqlauto_cluster,sqlauto_user'    #以，分割的字符串，如a,b,c

tableList = tables.split(',')

sourceIp = '192.168.1.101'

sourceDataBase = '/data/mysql/3306/data'

sourceDbName = 'inception_web'

sourceDataDir = os.path.join(sourceDataBase,sourceDbName)

desIp = '192.168.1.102'

desDataBase = '/data/mysql/3306/data'

desDbName = 'inception_web'

desDataDir = os.path.join(desDataBase,desDbName)



# for table in tableList:

#   desFile = Path("%s/%s.ibd" %(desDataDir,table))

#   print(desFile)

#   if desFile.is_file():

#     print("ok")

#   else:

#     print("no")



comUser = 'data_migration'

comPwd = 'data_migration@123'

comPort = 3306



client = paramiko.SSHClient()

client.set_missing_host_key_policy(paramiko.AutoAddPolicy())



def table_judge():

  print("table_judge")

  sourceTableExist = pymysql.connect(sourceIp,comUser,comPwd,sourceDbName,comPort,charset='utf8')

  desTableExist = pymysql.connect(desIp,comUser,comPwd,desDbName,comPort,charset='utf8')

  sourceTables = []

  desTables = []

  cursor_source = sourceTableExist.cursor()

  cursor_des = desTableExist.cursor()



  for table in tableList:

    #print(table)

    cursor_source.execute("select TABLE_NAME from information_schema.TABLES where TABLE_SCHEMA='%s' and TABLE_NAME='%s';" % (sourceDbName,table))

    sourceTable_tmp = cursor_source.fetchall()

    cursor_des.execute("select TABLE_NAME from information_schema.TABLES where TABLE_SCHEMA='%s' and TABLE_NAME='%s';" % (desDbName,table))

    desTable_tmp = cursor_des.fetchall()

    #print(desTable_tmp)

    if sourceTable_tmp is ():

      sourceTables.append(table)

    if desTable_tmp is not ():

      desTables.append(desTable_tmp[0][0])

  sourceTableExist.close()

  desTableExist.close()



  s=d=0

  if sourceTables != []:

    print('迁移源不存在将要迁移的表：',sourceIp,sourceDbName, sourceTables,' 请检查')

    s=1

  if desTables != []:

    print('目标库存在将要迁移的表：',desIp,desDbName,desTables,' 请移除')

    d=1

  if s == 1 or d == 1:

    sys.exit()



def data_sync():

  print('data_sync')

  db_source = pymysql.connect(sourceIp,comUser,comPwd,sourceDbName,comPort,charset='utf8')

  db_des = pymysql.connect(desIp,comUser,comPwd,desDbName,comPort,charset='utf8')

  cursor_db_source = db_source.cursor()

  cursor_db_des = db_des.cursor()



  for table in tableList:

    print("正在同步表：",table)

    cursor_db_source.execute("show create table %s;" % (table))

    createTableSQL = cursor_db_source.fetchall()[0][1]

    print(createTableSQL)

    try:

      cursor_db_des.execute(createTableSQL)

    except Exception as error:

      print(error)

    cursor_db_source.execute("flush table %s with read lock;" % (table))

    cursor_db_des.execute("alter table %s discard tablespace;" % (table))



    client.connect(sourceIp, 22, 'root')

    stdin1, stdout1, stderr1 = client.exec_command("scp %s %s:%s " % (sourceDataDir+"/"+table+".ibd", desIp, desDataDir))

    stdin2, stdout2, stderr2 = client.exec_command("scp %s %s:%s " % (sourceDataDir+"/"+table+".cfg", desIp, desDataDir))

    a_e_1 = stderr1.readlines()

    a_e_2 = stderr2.readlines()

    if a_e_1 != [] or a_e_2 != []:

      print(a_e_1,a_e_2)

      sys.exit()

    client.close()



    client.connect(desIp, 22, 'root')

    stdin3, stdout3, stderr3 = client.exec_command("chown -R mysql.mysql %s*" % (desDataDir+"/"+table))

    a_e_3 = stderr3.readlines()

    if a_e_3 != []:

      print(a_e_1, a_e_2)

      sys.exit()

    client.close()

    #cursor_db_source.execute("select sleep(10);")

    cursor_db_source.execute("unlock tables;")

    cursor_db_des.execute("alter table %s import tablespace;" % (table))

    print("同步完成")



  cursor_db_source.close()

  cursor_db_des.close()



def data_checksum():

  print('data_checksum')

  db_source = pymysql.connect(sourceIp,comUser,comPwd,sourceDbName,comPort,charset='utf8')

  db_des = pymysql.connect(desIp,comUser,comPwd,desDbName,comPort,charset='utf8')

  cursor_db_source = db_source.cursor()

  cursor_db_des = db_des.cursor()



  for table in tableList:

    print("正在校验表：", table)

    cursor_db_source.execute("checksum table %s;" % (table))

    ck_s = cursor_db_source.fetchall()[0][1]

    cursor_db_des.execute("checksum table %s;" % (table))

    ck_d = cursor_db_des.fetchall()[0][1]

    if ck_s != ck_d:

      print("表不一致：",table)

    else:

      print("表一致：",table)



  cursor_db_source.close()

  cursor_db_des.close()



if __name__ == "__main__":

  table_judge()

  data_sync()

  data_checksum()

  print('haha')