python实现MySQL指定表增量同步数据到clickhouse的脚本python实现MySQL指定表增量同步数据到clickhouse,脚本如下:
#!/usr/bin/env python3
# _*_ coding:utf8 _*_
from pymysqlreplication import BinLogStreamReader
w_event import (DeleteRowsEvent,UpdateRowsEvent,WriteRowsEvent,)
import clickhouse_driver
import configparser
import os
configfile='repl.ini'
>> 配置⽂件repl.ini 操作 >>>###
def create_configfile(configfile,log_file,log_pos):
config = configparser.ConfigParser()
if not ists(configfile):
config['replinfo'] = {'log_file':log_file,'log_pos':str(log_pos)}
with open(configfile,'w+') as f:
config.write(f)
### repl.ini 写操作 >>>###
def write_config(configfile,log_file,log_pos):
config = configparser.ConfigParser()
config.set('replinfo','log_file',log_file)
config.set('replinfo','log_pos',str(log_pos))
if ists(configfile):
with open(configfile,'w+') as f:
config.write(f)
else:
create_configfile(configfile)
### 配置⽂件repl.ini 读操作 >>>###
def read_config(configfile):
config = configparser.ConfigParser()
# print(config['replinfo']['log_file'])
# print(config['replinfo']['log_pos'])
return (config['replinfo']['log_file'],int(config['replinfo']['log_pos']))
>>### clickhouse 操作 >>>###
def ops_clickhouse(db,table,sql):
column_type_dic={}
try:
client = clickhouse_driver.Client(host='127.0.0.1',\
port=9000,\
user='default',\
password='clickhouse')
drop table if exists admin
# sql="select name,type lumns where database='{0}' and table='{1}'".format(db,table)
except Exception as error:
message = "获取clickhouse⾥⾯的字段类型错误. %s" % (error)
# (message)
print(message)
exit(1)
MYSQL_SETTINGS = {'host':'127.0.0.1','port':13306,'user':'root','passwd':'Root@0101'}
only_events=(DeleteRowsEvent, WriteRowsEvent, UpdateRowsEvent)
def main():
## 每次重启时,读取上次同步的log_file,log_pos
(log_file,log_pos) = read_config(configfile)
# print(log_file+'|'+ str(log_pos))
print('-----------------------------------------------------------------------------')
stream = BinLogStreamReader(connection_settings=MYSQL_SETTINGS, resume_stream=True, blocking=True, \
server_id=10,
only_tables='t_repl', only_schemas='test', \
log_file=log_file,log_pos=log_pos, \
only_events=only_events, \
fail_on_table_metadata_unavailable=True, slave_heartbeat=10)
try:
for binlogevent in stream:
for row ws:
## delete操作
if isinstance(binlogevent, DeleteRowsEvent):
info = dict(row["values"].items())
# print("DELETE FROM `%s`.`%s` WHERE %s = %s ;" %(binlogevent.schema ,binlogevent.table,binlogevent.primary_key,info[binlogevent.primary_key]) )
# print("ALTER TABLE `%s`.`%s` DELETE WHERE %s = %s ;" %(binlogevent.schema ,binlogevent.table,binlogevent.primary_key,info[binlogevent.primary_key]) )
sql="ALTER TABLE `%s`.`%s` DELETE WHERE %s = %s ;" %(binlogevent.schema ,binlogevent.table,binlogevent.primary_key,info[binlogevent.primary_key])
## update 操作
elif isinstance(binlogevent, UpdateRowsEvent):
info_before = dict(row["before_values"].items())
info_after = dict(row["after_values"].items())
# info_set = str(info_after).replace(":","=").replace("{","").replace("}","")
info_set = str(info_after).replace(":", "=").replace("{", "").replace("}", "").replace("'","")
# print("UPDATE `%s`.`%s` SET %s WHERE %s = %s ;"%(binlogevent.schema,binlogevent.table,info_set,binlogevent.primary_key,info_before[binlogevent.primary_key]  ) )
# print("ALTER TABLE %s.%s UPDATE %s WHERE %s = %s ;"%(binlogevent.schema,binlogevent.table,info_set,binlogevent.primary_key,info_before[binlogevent.primary_key]  ) )          sql = "ALTER TABLE %s.%s UPDATE %s WHERE %s = %s ;"%(binlogevent.schema,binlogevent.table,info_set,binlogevent.primary_key,info_before[binlogevent.primary_key]  )        ## insert 操作
elif isinstance(binlogevent, WriteRowsEvent):
info = dict(row["values"].items())
# print("INSERT INTO %s.%s(%s)VALUES%s ;"%(binlogevent.schema,binlogevent.table , ','.join(info.keys()) ,str(tuple(info.values())) ) )
sql = "INSERT INTO %s.%s(%s)VALUES%s ;"%(binlogevent.schema,binlogevent.table , ','.join(info.keys()) ,str(tuple(info.values())) )
ops_clickhouse('test', 't_repl',sql )
# 当前log_file,log_pos写⼊配置⽂件
write_config(configfile, stream.log_file, stream.log_pos)
except Exception as e:
print(e)
finally:
stream.close()
if __name__ == "__main__":
main()
'''
BinLogStreamReader()参数
ctl_connection_settings:集保存模式信息的连接设置
resume_stream:从位置或binlog的最新事件或旧的可⽤事件开始
log_file:设置复制开始⽇志⽂件
log_pos:设置复制开始⽇志pos(resume_stream应该为true)
auto_position:使⽤master_auto_position gtid设置位置
blocking:在流上读取被阻⽌
only_events:允许的事件数组
ignored_events:被忽略的事件数组
only_tables:包含要观看的表的数组(仅适⽤于binlog_format ROW)
ignored_tables:包含要跳过的表的数组
only_schemas:包含要观看的模式的数组
ignored_schemas:包含要跳过的模式的数组
freeze_schema:如果为true,则不⽀持ALTER TABLE。速度更快。
skip_to_timestamp:在达到指定的时间戳之前忽略所有事件。
report_slave:在SHOW SLAVE HOSTS中报告奴⾪。
slave_uuid:在SHOW SLAVE HOSTS中报告slave_uuid。
fail_on_table_metadata_unavailable:如果我们⽆法获取有关row_events的表信息,应该引发异常
slave_heartbeat:(秒)主站应主动发送⼼跳连接。这也减少了复制恢复时GTID复制的流量(在许多事件在binlog中跳过的情况下)。请参阅mysql⽂档中的MASTER_HEARTBEAT_PERIOD以了解语义'''
知识点扩展:
MySQL备份-增量同步
mysql增量同步主要使⽤binlog⽂件进⾏同步,binlog⽂件主要记录的是数据库更新操作相关的内容。
1. 备份数据的意义
针对不同业务,7*24⼩时提供服务和数据的重要性不同。
数据库数据是⽐较核⼼的数据,对企业的经营⾄关重要,数据库备份显得尤为重要。
2. 备份数据库
MySQL数据库⾃带的备份命令 `mysqldump`,基本使⽤⽅法:
语法:`mysqldump -u username -p password dbname > filename.sql`
执⾏备份命令
`mysqldump -uroot -pmysqladmin db_test > /opt/mysql_bak.sql`
查看备份内容
`grep -v "#|\*|--|^$" /opt/mysql_bak.sql`
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