python操作mysql代码讲解(及其实用,未来测试工作主要操作数据库的方法)
pymsql
pymsql是Python中操作MySQL的模块,其使用方法和MySQLdb几乎相同。
下载安装
|
1
|
pip3 install pymysql |
使用操作
1、执行SQL
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
#!/usr/bin/env python# -*- coding:utf-8 -*-import pymysql # 创建连接conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123', db='t1')# 创建游标cursor = conn.cursor() # 执行SQL,并返回收影响行数effect_row = cursor.execute("update hosts set host = '1.1.1.2'") # 执行SQL,并返回受影响行数#effect_row = cursor.execute("update hosts set host = '1.1.1.2' where nid > %s", (1,)) # 执行SQL,并返回受影响行数#effect_row = cursor.executemany("insert into hosts(host,color_id)values(%s,%s)", [("1.1.1.11",1),("1.1.1.11",2)]) # 提交,不然无法保存新建或者修改的数据conn.commit() # 关闭游标cursor.close()# 关闭连接conn.close() |
2、获取新创建数据自增ID
|
1
2
3
4
5
6
7
8
9
10
11
12
13
|
#!/usr/bin/env python# -*- coding:utf-8 -*-import pymysql conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123', db='t1')cursor = conn.cursor()cursor.executemany("insert into hosts(host,color_id)values(%s,%s)", [("1.1.1.11",1),("1.1.1.11",2)])conn.commit()cursor.close()conn.close() # 获取最新自增IDnew_id = cursor.lastrowid |
3、获取查询数据
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
#!/usr/bin/env python# -*- coding:utf-8 -*-import pymysql conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123', db='t1')cursor = conn.cursor()cursor.execute("select * from hosts") # 获取第一行数据row_1 = cursor.fetchone() # 获取前n行数据# row_2 = cursor.fetchmany(3)# 获取所有数据# row_3 = cursor.fetchall() conn.commit()cursor.close()conn.close() |
注:在fetch数据时按照顺序进行,可以使用cursor.scroll(num,mode)来移动游标位置,如:
- cursor.scroll(1,mode='relative') # 相对当前位置移动
- cursor.scroll(2,mode='absolute') # 相对绝对位置移动

浙公网安备 33010602011771号