python 的mysql 操作

import pymysql
import pandas
from IPython.core.display import display

db = pymysql.connect(
    host=‘localhost‘,
    port=3306,
    user=‘root‘,
    password=‘root‘,
    db=‘test‘,
    charset=‘utf8‘
)

cursor = db.cursor()
sql = "select * from user"
result = cursor.execute(sql)
# result 接收的是总条数 是一个 int 值
print(result)

data = cursor.fetchone()
# print(data)

# fet**  系列的方法 是提取结果，不是拷贝
resultSet = cursor.fetchall()

print(resultSet)

for i in resultSet:
    print(i)

print(len(resultSet))

print(resultSet[0])

resultSet2 = cursor.fetchall()

print(resultSet2)

for i in range(len(resultSet)):
    print(i)
    print(resultSet[i])

cursor.execute(sql)
resultSet = cursor.fetchall()

for a,b,c in resultSet:
    print(" 我的名字是{} ，编号是 {} ， 这是我的密码{}".format(b,a,c))

# 用表格显示
df1 = pandas.read_sql(sql,db)
display(df1)

sqlinsert = ‘insert into user (uname,pwd)values ("牛魔王","123123")‘

try:
    cursor.execute(sqlinsert)
    db.commit()
except:
    print("insert failed")
    db.rollback()
sqlinsert2 = ‘insert into user (uname,pwd)values (%s,%s)‘
insertdata = [("孙悟空","123456"),("唐僧","123123")]
try:
    cursor.executemany(sqlinsert2,insertdata)
    db.commit()
except:
    print("insertFailed")
    db.rollback()

sqlupdate = ‘update user set pwd=%s where name=%s‘
try:
    cursor.execute(sqlupdate,[90000,"玉皇大帝"])
    db.commit()
except:
    print("update failed")
    db.rollback()

db.close();