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()

到此这篇关于通过python收集汇聚mysql 表信息的文章就介绍到这了,更多相关python mysql 表信息内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持！