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：