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')