python制作mysql数据迁移脚本

Python  /  管理员 发布于 7年前   192

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 paramikoimport os#from pathlib import Pathimport sysimport pymysqlimport 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,ctableList = 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 = 3306client = 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')