今天呢主要对pymysql模块进行使用讲解一下：
https://www.cnblogs.com/lilidun/p/6041198.html
Linux系统上安装pip3通过这个文档查看
查询操作：
import pymysql
db = pymysql.connect(host="localhost",user="root",password="",db="lxf",port=3306)
# 使用cursor（）获取操作游标
cur = db.cursor()
#查询操作
sql = "select * from user"
try:
cur.execute(sql) # 执行sql语句
results = cur.fetchall() # 获取查询的所有记录
print("id", "name", "password")
# 遍历结果
for row in results:
id = row[0]
name = row[1]
password = row[2]
print(id, name, password)
except Exception as e:
raise e
finally:
db.close() #关闭连接
插入数据：
import pymysql
db = pymysql.connect(host='localhost',user='root',password='',db='lxf',port=3306)
cur = db.cursor()
#插入操作
sql_insert = """insert into user(id,name,pwd) values(5,'liu','123')"""
try:
cur.execute(sql_insert)
# 提交
db.commit()
except Exception as e:
# 错误回滚
db.rollback()
finally:
db.close()
更新操作：
import pymysql
# 3.更新操作
db = pymysql.connect(host="localhost", user="root",
password="", db="lxf", port=3306)
# 使用cursor()方法获取操作游标
cur = db.cursor()
sql_update = "update user set name = '%s' where id = %d"
try:
cur.execute(sql_update % ("lxf", 1)) # 像sql语句传递参数
# 提交
db.commit()
except Exception as e:
# 错误回滚
db.rollback()
finally:
db.close()
删除操作：
import pymysql
db = pymysql.connect(host='localhost',user='root',password='',db='lxf',port=3306)
#使用游标
cur = db.cursor()
sql_delete="delete from user where id = %d"
try:
cur.execute(sql_delete %(1)) #传递参数
#提交
db.commit()
except Exception as e:
#错误回滚
db.rollback()
finally:
db.close()
数据库备份：
#!/usr/bin/env python
import pymysql
import os
import time
TIME =time.strftime("%Y-%m-%d %H:%M:%S",time.localtime())
connect = pymysql.connect(host='localhost',user='root',password='123456',db='test',port=3306)
conn = connect.cursor()
os.system("""mysqldump -uroot -p123456 test > /root/test.sql""")
其实这里只是一个简单的备份，还可以加上time模块备份每一天有日期，另外还可以加上hash模块对密码进行加密，如果要想了解这两个模块的用发可以看看我的python分类中有相关的操作