python3增删改查

增

import pymysql


#打开数据库连接（地址,用户名,密码,数据库名称）
db = pymysql.connect("localhost","root","123456","test")
#创建游标
cursor = db.cursor()

try:
    #传入的数据
    id=0
    name='admin'
    password='admin'
    status=0
    
    cursor.execute('insert into user(id,name,password,status) values("%d","%s", "%s","%d")' % \
             (id, name,password,status))
    #执行
    db.commit()
except:
    db.rollback()
db.close(); 

删

import pymysql
db = pymysql.connect("localhost","root","123456","test")
cursor = db.cursor()
id=4
sql = "DELETE FROM user WHERE id = %d" % \
(id)
try:
    cursor.execute(sql)
    db.commit()
except:
    db.rollback();
db.close()

改

import pymysql

db = pymysql.connect("localhost","root","123456","test")
cursor = db.cursor()
id = 6
name='6'
password='6'
status=6
sql = "update user set name=%s,password=%s,status=%d where id=%d" % \
(name,password,status,id)

try:
    cursor.execute(sql)
    db.commit()
except:
    db.rollback()
db.close()

查

import pymysql

db = pymysql.connect('localhost','root','123456','test')
cursor = db.cursor()
sql="select * from user"
try:
    cursor.execute(sql)
    result = cursor.fetchall()
    for row in result:
        id = row[0]
        name=row[1]
        password=row[2]
        status=row[3]
        print("id=%d,name=%s,password=%s,status=%d" % \
              (id,name,password,status))
except:
    print("unable to fetch data")
    db.close();