abstract:Python里面操作MySQL可以通過兩個方式:pymysql模塊ORM框架的SQLAchemey先學習第一種方式。學習Python模塊之前,首先看看MySQL的基本安裝和使用,具體語法可以參考豆子之前的博客http://beanxyz.blog.51cto.com/5570417/1609972或者官方簡介https://mariadb.com/kb/en/mariadb/basic-sql-s
Python里面操作MySQL可以通過兩個方式:
pymysql模塊
ORM框架的SQLAchemey
先學習第一種方式。
學習Python模塊之前,首先看看MySQL的基本安裝和使用,具體語法可以參考豆子之前的博客http://beanxyz.blog.51cto.com/5570417/1609972
或者官方簡介
https://mariadb.com/kb/en/mariadb/basic-sql-statements/
簡單的回顧一下基本環(huán)境的搭建:
首先安裝Mariadb(我的環(huán)境是CentOS7)
yum install mariadb* systemctl start mariadb
配置防火墻
firewall-cmd --add-port=3306/tcp --permanent systemctl restart firewalld
配置root密碼
mysqladmin -u root password 'mysql' mysql -uroot -p
創(chuàng)建一個測試用的數(shù)據(jù)庫和表
MariaDB [(none)]> create database mydb; Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> use mydb Database changed MariaDB [mydb]> create table student(id int not null auto_increment,name varchar(10), primary key(id)); Query OK, 0 rows affected (0.04 sec) MariaDB [mydb]> insert into student(name) values('Jay'),('Bob'),('Alex'); Query OK, 3 rows affected (0.00 sec) Records: 3 Duplicates: 0 Warnings: 0 MariaDB [mydb]> select * from student; +----+------+ | id | name | +----+------+ | 1 | Jay | | 2 | Bob | | 3 | Alex | +----+------+ 3 rows in set (0.00 sec)
創(chuàng)建一個遠程訪問的賬戶
MariaDB [(none)]> create user yli@10.2.100.60; Query OK, 0 rows affected (0.00 sec) MariaDB [(none)]> set password for yli@'10.2.100.60'=password('yli'); Query OK, 0 rows affected (0.01 sec) MariaDB [(none)]> grant all privileges on mydb.* to yli@10.2.100.60; Query OK, 0 rows affected (0.00 sec)
然后安裝一個圖形界面的工具Navicat,綁定數(shù)據(jù)庫
這樣一個基本的測試環(huán)境就搭建好了。
現(xiàn)在來看看pymysql的使用。
在我的客戶端安裝一下pymysql的模塊
C:\WINDOWS\system32>pip install pymysql Collecting pymysql Downloading PyMySQL-0.7.9-py3-none-any.whl (78kB) 100% |################################| 81kB 610kB/s Installing collected packages: pymysql Successfully installed pymysql-0.7.9
Python源碼演示
查詢
#!/usr/bin/env python # -*- coding:utf-8 -*- import pymysql #打開數(shù)據(jù)庫連接 conn = pymysql.connect(host='sydnagios', port=3306, user='yli', passwd='yli', db='mydb') #創(chuàng)建一個游標對象 cursor = conn.cursor(cursor=pymysql.cursors.DictCursor) #SQL查詢 cursor.execute("select * from student") # 獲取第一行數(shù)據(jù) # row_1 = cursor.fetchone() # print(row_1) # 獲取前n行數(shù)據(jù) # row_2 = cursor.fetchmany(3) # 獲取所有數(shù)據(jù) row_3 = cursor.fetchall() print(row_3) #scroll可以使用相對位置或者絕對位置,這里相對位置(末尾)向上移動2行 cursor.scroll(-2,mode='relative') row_3 = cursor.fetchall() print(row_3) #提交,不然無法保存新的數(shù)據(jù) conn.commit() #關閉游標 cursor.close() #關閉連接 conn.close() ----------- [{'id': 1, 'name': 'Jay'}, {'id': 2, 'name': 'Bob'}, {'id': 3, 'name': 'Alex'}] [{'id': 2, 'name': 'Bob'}, {'id': 3, 'name': 'Alex'}]
修改
#!/usr/bin/env python # -*- coding:utf-8 -*- import pymysql conn = pymysql.connect(host='sydnagios', port=3306, user='yli', passwd='yli', db='mydb') cursor = conn.cursor(cursor=pymysql.cursors.DictCursor) cursor.execute("Update student set name='BoB' where id=2") cursor.execute("select * from student") row_3 = cursor.fetchall() print(row_3) conn.commit() cursor.close() conn.close() ---------- [{'id': 1, 'name': 'Chris'}, {'id': 2, 'name': 'BoB'}, {'id': 3, 'name': 'Alex'}]
刪除
#!/usr/bin/env python # -*- coding:utf-8 -*- import pymysql conn = pymysql.connect(host='sydnagios', port=3306, user='yli', passwd='yli', db='mydb') cursor = conn.cursor(cursor=pymysql.cursors.DictCursor) cursor.execute("delete from student where id=2") cursor.execute("select * from student") row_3 = cursor.fetchall() print(row_3) conn.commit() cursor.close() conn.close() ---------- [{'id': 1, 'name': 'Chris'}, {'id': 2, 'name': 'BoB'}, {'id': 3, 'name': 'Alex'}]
添加
#!/usr/bin/env python # -*- coding:utf-8 -*- import pymysql conn = pymysql.connect(host='sydnagios', port=3306, user='yli', passwd='yli', db='mydb') cursor = conn.cursor(cursor=pymysql.cursors.DictCursor) cursor.execute("insert into student(name) value ('ZhangSan'),('LiSi')") cursor.execute("select * from student") row_3 = cursor.fetchall() print(row_3) conn.commit() cursor.close() conn.close() ---------- [{'name': 'Chris', 'id': 1}, {'name': 'Alex', 'id': 3}, {'name': 'ZhangSan', 'id': 4}, {'name': 'LiSi', 'id': 5}]