python 常用连接mysql数据库的方式

 pymysql

import pymysql
# 创建连接
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='tkq1', charset='utf8')
# 创建游标
cursor = conn.cursor()
# 执行SQL，并返回收影响行数
effect_row = cursor.execute("select * from tb7")
# 执行SQL，并返回受影响行数
#effect_row = cursor.execute("update tb7 set pass = '123' where nid = %s", (11,))
# 执行SQL，并返回受影响行数,执行多次
#effect_row = cursor.executemany("insert into tb7(user,pass,licnese)values(%s,%s,%s)", [("u1","u1pass","11111"),("u2","u2pass","22222")])
# 提交，不然无法保存新建或者修改的数据
conn.commit()
# 关闭游标
cursor.close()
# 关闭连接
conn.close()

mysql

import mysql.connector

mydb = mysql.connector.connect(
  host="localhost",
  user="root",
  passwd="root",
  database="公交站点测试"
)

mycursor = mydb.cursor()

# sql = "UPDATE customers SET address = %s WHERE address = %s"
# val = ("Valley 345", "Canyon 123")
# mcuyrsor.execute(sql, val)
sql = 'update 站点标注汇总 set routename_BK=right(routename,LENGTH(routename)-1) where left(routename,1)="B"'
mycursor.execute(sql)

mydb.commit()

print(mycursor.rowcount, " 条记录已更新")