试了一下python操作数据库，准备将前端传回来的用户名和密码写入表中

试了半天不会把变量加在在sql语句里面

网上搜索了一下，要用元组来传递多个参数

sql = "insert into userinfo values(%s,%s)"

cursor.execute(sql,(name,password))

补充拓展：python往mysql数据库中写入数据和更新插入数据

1. 连接mysql

import pymysql

db = pymysql.connect(host='localhost', user='root', password='123456', port=3306, db='spiders')

cursor = db.cursor()

sql = 'select * from students;'

cursor.execute(sql)

cursor.close()

db.close()

2. 多字段动态插入mysql数据库中

import pymysql

db = pymysql.connect(host='localhost',user='root', password='123456', port=3306, db='spiders')

data = {

'id': '20180606',

'name': 'Lily',

'age': 20

}

table = 'students'

keys = ', '.join(data.keys())

values = ', '.join(['%s'] * len(data))

sql = 'INSERT INTO {table}({keys}) VALUES ({values})'.format(table=table, keys=keys, values=values)

try:

cursor.execute(sql, tuple(data.values()))

print('Successful')

db.commit()

except:

print('Failed')

db.rollback()

cursor.close()

db.close()

3. 数据更新插入mysql数据库中

import pymysql

db = pymysql.connect(host='localhost',user='root', password='123456', port=3306, db='spiders')

data = {

'id': '20180606',

'name': 'Lily',

'age': 25

}

table = 'students'

keys = ', '.join(data.keys())

values = ', '.join(['%s'] * len(data))

sql = 'INSERT INTO {table}({keys}) VALUES ({values}) ON DUPLICATE KEY UPDATE'.format(table=table, keys=keys, values=values)

update = ','.join([" {key} = %s".format(key=key) for key in data])

sql += update

try:

cursor.execute(sql, tuple(data.values())*2)

print('Successful')

db.commit()

except:

print('Failed')

db.rollback()

cursor.close()

db.close()

以上这篇python3将变量写入SQL语句的实现方式就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。