python3.6连接mysql或者mariadb

python3.6版本的安装查看上一篇文章

mysql或mariadb数据库的安装查看以前的文章，这里不再赘述

首先在mariadb数据库中创建相应的库和表：

MariaDB [(none)]> create database oracle default character set utf8 default collate utf8_general_ci;
Query OK, 1 row affected (0.00 sec)

MariaDB [oracle]> create table oracle_indexmonitor( index_name varchar(200) not null, ipaddress varchar(39) not null, tnsname varchar(100) not null, insert_time timestamp default current_timestamp, primary key(index_name) ) engine=InnoDB default charset=utf8; 

Query OK, 0 rows affected (0.01 sec)

MariaDB [oracle]> desc oracle_indexmonitor;
+-------------+--------------+------+-----+-------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+--------------+------+-----+-------------------+-------+
| index_name | varchar(200) | NO | PRI | NULL | |
| ipaddress | varchar(39) | NO | | NULL | |
| tnsname | varchar(100) | NO | | NULL | |
| insert_time | timestamp | NO | | CURRENT_TIMESTAMP | |
+-------------+--------------+------+-----+-------------------+-------+
4 rows in set (0.00 sec)

安装需要用到的模块pymysql：

[root@wadeson Python-3.6.1]# /usr/local/python36/bin/pip3 install PyMysql
Collecting PyMysql
Downloading PyMySQL-0.7.11-py2.py3-none-any.whl (78kB)
100% |¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€¨€| 81kB 87kB/s
Installing collected packages: PyMysql
Successfully installed PyMysql-0.7.11

检测模块是否安装成功：

[root@wadeson Python-3.6.1]# python
Python 3.6.1 (default, Jul 13 2017, 15:41:38)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-18)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pymysql
>>> exit()

然后编写py脚本：

[root@wadeson Python-3.6.1]# cd /root/tools/scripts/

[root@wadeson scripts]# vim connectmysql.py

#!/usr/bin/python
#coding=utf8

import pymysql

#连接数据库，host、账号、密码、库

db = pymysql.connect('localhost','root','redhat','oracle')

#创建游标使用的cursor方法

cursor = db.cursor()

#使用execute方法执行sql语句

cursor.execute('select version()')

#使用fetchone方法获取单条数据

data = cursor.fetchone()

print('Database version:%s' % data)

#关闭游标，并关闭数据库

cursor.close()

db.close()

[root@wadeson scripts]# python connectmysql.py
Database version:5.5.55-MariaDB

note：

Python查询Mysql使用 fetchone() 方法获取单条数据, 使用fetchall() 方法获取多条数据。

　　fetchone(): 该方法获取下一个查询结果集。结果集是一个对象

　　fetchall(): 接收全部的返回结果行.

　　rowcount: 这是一个只读属性，并返回执行execute()方法后影响的行数。

note：如果使用以上方法安装报错：ssl模块不可用

那么可以使用编译安装：

wget https://pypi.python.org/packages/f5/d9/976c885396294bb1c4ca3d013fd2046496cde2efbb168e4f41dd12552dd9/PyMySQL-0.7.6.tar.gz#md5=d1353d9ad6e6668c3c463603b12cadb0

tar xf PyMySQL-0.7.6.tar.gz

cd PyMySQL-0.7.6

python setup.py build

python setup.py install

然后验证是否安装成功：

[root@oracle PyMySQL-0.7.6]# python
Python 3.6.1 (default, Jul 13 2017, 14:31:18)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pymysql
>>>