python获取数据库更新消息（原文链接:https://www.cnblogs.com/zhangjianhua/p/8080538.html）

1.软件安装 

[root@mha-maxscale-1 ~]# pip install mysql-replication

2.MySQL授权

 GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'replicator'@'192.168.3.%' IDENTIFIED BY '123456';

3.Binlog要满足如下条件

MySQL>root@(none) 09:53:38>show variables like 'log_bin';
+---------------+-------+
| Variable_name | Value     |
+---------------+-------+
| log_bin       | ON       |
+---------------+-------+
1 row in set (0.01 sec)

MySQL>show variables like 'binlog_format';
+---------------+-------+
| Variable_name | Value     |
+---------------+-------+
| binlog_format | ROW      |
+---------------+-------+
1 row in set (0.00 sec)

MySQL>show variables like 'binlog_row_image';
+------------------+-------+
| Variable_name    | Value     |
+------------------+-------+
| binlog_row_image | FULL      |
+------------------+-------+
1 row in set (0.00 sec)

4.示例代码

 

[root@mha-maxscale-1 script]# cat mysql-replication.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from pymysqlreplication import BinLogStreamReader
from pymysqlreplication.row_event import (
    DeleteRowsEvent,
    UpdateRowsEvent,
    WriteRowsEvent,
)
import sys
import json

def main():
    mysql_settings = {'host': '192.168.3.130',
                      'port': 3306, 'user': 'replicator', 'passwd': '123456'}
    stream = BinLogStreamReader(
        connection_settings=mysql_settings,
        server_id=101,
        blocking=True,
        only_schemas=['zow'],
        only_events=[DeleteRowsEvent, WriteRowsEvent, UpdateRowsEvent],
        resume_stream=True,
        log_file='mysql-bin.000013', log_pos=6197)

    for binlogevent in stream:
        for row in binlogevent.rows:
            event = {"schema": binlogevent.schema, "table": binlogevent.table, "log_pos": binlogevent.packet.log_pos}
            if isinstance(binlogevent, DeleteRowsEvent):
                event["action"] = "delete"
                event["values"] = dict(row["values"].items())
                event = dict(event.items())
            elif isinstance(binlogevent, UpdateRowsEvent):
                event["action"] = "update"
                event["before_values"] = dict(row["before_values"].items())
                event["after_values"] = dict(row["after_values"].items())
                event = dict(event.items())
            elif isinstance(binlogevent, WriteRowsEvent):
                event["action"] = "insert"
                event["values"] = dict(row["values"].items())
                event = dict(event.items())
            print json.dumps(event)
            sys.stdout.flush()

    stream.close()

if __name__ == "__main__":
    main()