Python连接mysql数据库及简单增删改查操作示例代码
Python连接mysql数据库及简单增删改查操作示例代码
1.安装pymysql
进入cmd,输入 pip install pymysql:
2.数据库建表
在数据库中,建立一个简单的表,如图:
3.简单操作
3.1查询操作
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
|
#coding=utf-8 #连接数据库测试 import pymysql #打开数据库 db = pymysql.connect(host = "localhost" ,user = "root" ,password = "root" ,db = "test" ) #使用cursor()方法获取操作游标 cur = db.cursor() #查询操作 sql = "select * from books" try : # 执行sql语句 cur.execute(sql) results = cur.fetchall() #遍历结果 for rows in results: id = rows[ 0 ] name = rows[ 1 ] price = rows[ 2 ] bookcount = rows[ 3 ] author = rows[ 4 ] print ( "id: {}, name: {}, price: {}, bookcount: {}, author: {}" . format ( id ,name,price,bookcount,author)) except Exception as e: raise e finally : db.close() |
运行结果:
3.2插入操作
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
#coding=utf-8 #插入操作 import pymysql db = pymysql.connect(host = "localhost" ,user = "root" ,password = "root" ,db = "test" ) cur = db.cursor() sql = """insert into books(id,bookname,price,bookCount,author) values (4,'三体',20,3,'刘慈欣')""" try : cur.execute(sql) #提交 db.commit() except Exception as e: #错误回滚 db.rollback() finally : db.close() |
运行结果:
3.3更新操作
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
#coding=utf-8 #更新操作 import pymysql db = pymysql.connect(host = "localhost" ,user = "root" ,password = "root" ,db = "test" ) # 使用cursor()方法获取游标 cur = db.cursor() sql_update = "update books set bookname = '%s',author = '%s' where id = %d" try : cur.execute(sql_update % ( "边城" , "沈从文" , 4 )) #提交 db.commit() except Exception as e: #错误回滚 db.rollback() finally : db.close() |
运行结果:
3.4删除操作
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
#coding=utf-8 #删除操作 import pymysql db = pymysql.connect(host = "localhost" ,user = "root" ,password = "root" ,db = "test" ) #使用cursor()获取操作游标 cur = db.cursor() sql_delete = "delete from books where id = %d" try : #向sql语句传递参数 cur.execute(sql_delete % ( 1 )) #提交 db.commit() except Exception as e: #错误回滚 db.rollback() finally : db.close() |
运行结果: