通过Python收集汇聚MySQL 表信息的实例详解

一.需求

统计收集各个实例上table的信息，主要是表的记录数及大小。

收集的范围是cmdb中所有的数据库实例。

二.公共基础文件说明

1.配置文件

配置文为db_servers_conf.ini，假设cmdb的DBServer为119.119.119.119，单独存放收集监控数据的DBserver为110.110.110.110. 这两个DB实例的访问用户名一样，定义在了[uid_mysql] 部分，需要去收集的各个DB实例，用到的账号密码是另一个，定义在了[collector_mysql]部分。

[uid_mysql]
dbuid = 用*户*名
dbuid_p_w_d = 相*应*密*码

[cmdb_server]
db_host = 119.119.119.119
db_port = 3306

[dbmonitor_server]
db_host = 110.110.110.110
db_port = 3306

[collector_mysql]
collector = DB*实*例*用*户*名
collector_p_w_d = DB*实*例*密*码

2.定义声明db连接

文件为get_mysql_db_connect.py

# -*- coding: utf-8 -*-

import sys
import os
import configparser
import pymysql

# 获取连接串信息
def mysql_get_db_connect(db_host, db_port):
   db_host = db_host
   db_port = db_port

db_ps_file = os.path.join(sys.path[0], "db_servers_conf.ini")
   config = configparser.ConfigParser()
   config.read(db_ps_file, encoding="utf-8")
   db_user = config.get('uid_mysql', 'dbuid')
   db_pwd = config.get('uid_mysql', 'dbuid_p_w_d')

conn = pymysql.connect(host=db_host, port=db_port, user=db_user, password=db_pwd,  connect_timeout=5, read_timeout=5, write_timeout=5)

return conn

# 获取连接串信息
def mysql_get_collectdb_connect(db_host, db_port):
   db_host = db_host
   db_port = db_port

db_ps_file = os.path.join(sys.path[0], "db_servers_conf.ini")
   config = configparser.ConfigParser()
   config.read(db_ps_file, encoding="utf-8")
   db_user = config.get('collector_mysql', 'collector')
   db_pwd = config.get('collector_mysql', 'collector_p_w_d')

conn = pymysql.connect(host=db_host, port=db_port, user=db_user, password=db_pwd,  connect_timeout=5, read_timeout=5, write_timeout=5)

return conn

3.定义声明访问db的操作

文件为mysql_exec_sql.py,注意需要导入上面的model。

# -*- coding: utf-8 -*-

import get_mysql_db_connect

def mysql_exec_dml_sql(db_host, db_port, exec_sql):
   conn = mysql_get_db_connect.mysql_get_db_connect(db_host, db_port)
   with conn.cursor() as cursor_db:
       cursor_db.execute(exec_sql)
       conn.commit()
       ##需要显式关闭
       cursor_db.close()
       conn.close()

def mysql_exec_select_sql(db_host, db_port, exec_sql):
   conn = mysql_get_db_connect.mysql_get_db_connect(db_host, db_port)
   with conn.cursor() as cursor_db:
       cursor_db.execute(exec_sql)
       sql_rst = cursor_db.fetchall()
       ##显式关闭conn
       cursor_db.close()
       conn.close()

return sql_rst

def mysql_exec_select_sql_include_colnames(db_host, db_port, exec_sql):
   conn = mysql_get_db_connect.mysql_get_db_connect(db_host, db_port)
   with conn.cursor() as cursor_db:
       cursor_db.execute(exec_sql)
       sql_rst = cursor_db.fetchall()
       col_names = cursor_db.description
   return sql_rst, col_names

三.主要代码

3.1 创建保存数据的脚本

用来保存收集表信息的表：table_info

create table `table_info` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `host_ip` varchar(50) NOT NULL DEFAULT '0',
 `port` varchar(10) NOT NULL DEFAULT '3306',
 `db_name` varchar(100) NOT NULL DEFAULT ''   COMMENT '数据库名字',
 `table_name` varchar(100) NOT NULL DEFAULT '' COMMENT '表名字',
 `table_rows` bigint NOT NULL DEFAULT 0 COMMENT '表行数',
 `table_data_length` bigint,
 `table_index_length` bigint,
 `table_data_free` bigint,
 `table_auto_increment` bigint,
 `creator` varchar(50) NOT NULL DEFAULT '',
 `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
 `operator` varchar(50) NOT NULL DEFAULT '',
 `operate_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4
;

收集过程，如果访问某个实例异常时，将失败的信息保存到表 gather_error_info 中，以便跟踪分析。

create table `gather_error_info` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `app_name` varchar(150) NOT NULL DEFAULT '报错的程序',
 `host_ip` varchar(50) NOT NULL DEFAULT '0',
 `port` varchar(10) NOT NULL DEFAULT '3306',
 `db_name` varchar(60) NOT NULL DEFAULT '0' COMMENT '数据库名字',
 `error_msg` varchar(500) NOT NULL DEFAULT '报错的程序',
 `status` int(11) NOT NULL DEFAULT '2',
 `creator` varchar(50) NOT NULL DEFAULT '',
 `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
 `operator` varchar(50) NOT NULL DEFAULT '',
 `operate_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

3.2 收集的功能脚本

定义收集 DB_info的脚本collect_tables_info.py

# -*- coding: utf-8 -*-

import sys
import os
import datetime
import configparser
import pymysql
import mysql_get_db_connect
import mysql_exec_sql
import mysql_collect_exec_sql
import pandas as pd

def collect_tables_info():
   db_ps_file = os.path.join(sys.path[0], "db_servers_conf.ini")
   config = configparser.ConfigParser()
   config.read(db_ps_file, encoding="utf-8")

cmdb_host = config.get('cmdb_server', 'db_host')
   cmdb_port = config.getint('cmdb_server', 'db_port')

monitor_db_host = config.get('dbmonitor_server', 'db_host')
   monitor_db_port = config.getint('dbmonitor_server', 'db_port')

# 获取需要遍历的DB列表
   exec_sql_1 = """
select  vm_ip_address,port,b.vm_host_name,remark
FROM cmdbdb.mysqldb_instance
;
   """

exec_sql_tablesizeinfo = """
select TABLE_SCHEMA,table_name,table_rows,data_length ,index_length,data_free,auto_increment
from information_schema.tables
where TABLE_SCHEMA not in ('mysql','information_schema','performance_schema','sys')
and TABLE_TYPE ='BASE TABLE';
   """

exec_sql_insert_tablesize = " insert into monitordb.table_info (host_ip,port,db_name,table_name,table_rows,table_data_length,table_index_length,table_data_free,table_auto_increment) \
VALUES ('％s', '％s','％s','％s', ％s ,％s, ％s,％s, ％s) ;"

exec_sql_error = " insert into monitordb.gather_db_error (app_name,host_ip,port,error_msg) \
VALUES ('％s', '％s','％s','％s') ;"

sql_rst_1 = mysql_exec_sql.mysql_exec_select_sql(cmdb_host, cmdb_port, exec_sql_1)
   if len(sql_rst_1):
       for i in range(len(sql_rst_1)):
           rw_host = list(sql_rst_1[i])
           db_host_ip = rw_host[0]
           db_port_s = rw_host[1]
           ##print(type(rw_host))

###ValueError: port should be of type int
           db_port = int(db_port_s)
           try:
             sql_rst_tablesize = mysql_collect_exec_sql.mysql_exec_select_sql(db_host_ip, db_port, exec_sql_tablesizeinfo)
             ##print(sql_rst_tablesize)
             if len(sql_rst_tablesize):
                 for i in range(len(sql_rst_tablesize)):
                     rw_tableinfo = list(sql_rst_tablesize[i])
                     rw_db_name = rw_tableinfo[0]
                     rw_table_name = rw_tableinfo[1]
                     rw_table_rows = rw_tableinfo[2]
                     rw_data_length = rw_tableinfo[3]
                     rw_index_length = rw_tableinfo[4]
                     rw_data_free = rw_tableinfo[5]
                     rw_auto_increment = rw_tableinfo[6]

##print(rw_auto_increment)
                     ##Python中对变量是否为None的判断
                     if rw_auto_increment is None:
                        rw_auto_increment = 0
                     ###一定要有一个exec_sql_insert_table_com，如果是exec_sql_insert_tablesize = exec_sql_insert_tablesize  ％  ( db_host_ip.......
                     ####则提示报错:报错信息是 TypeError: not all arguments converted during string formatting
                     exec_sql_insert_table_com = exec_sql_insert_tablesize  ％  ( db_host_ip , db_port_s, rw_db_name, rw_table_name , rw_table_rows , rw_data_length , rw_index_length , rw_data_free , rw_auto_increment)
                     print(exec_sql_insert_table_com)
                     sql_insert_rst_1 = mysql_exec_sql.mysql_exec_dml_sql(monitor_db_host, monitor_db_port, exec_sql_insert_table_com)
                     #print(sql_insert_rst_1)
           except:
             ####print('TypeError的错误信息如下:' + str(TypeError))
             print(db_host_ip +'  '+str(db_port) + '登入异常无法获取table信息,请检查实例和访问账号!')
             exec_sql_error_sql = exec_sql_error  ％  ( 'collect_tables_info',db_host_ip , str(db_port),'登入异常，获取table信息失败,请检查实例和访问的账号!!!' )
             sql_insert_err_rst_1 = mysql_exec_sql.mysql_exec_dml_sql(monitor_db_host, monitor_db_port, exec_sql_error_sql)
       ##print(sql_rst_1)
   else:
       print('查询无结果集')

collect_tables_info()

来源：https://www.cnblogs.com/xuliuzai/archive/2021/10/24/15327808.html