pymysql的用法

import pymysql

user = input("username:")
pwd = input("password:")

conn = pymysql.connect(host="localhost",user='root',password='',database="db666")
cursor = conn.cursor()
sql = "select * from userinfo where username='%s' and password='%s'" %(user,pwd,)
# select * from userinfo where username='uu' or 1=1 -- ' and password='%s'
cursor.execute(sql)
result = cursor.fetchone()
cursor.close()
conn.close()

if result:
    print('登錄成功')
else:
    print('登錄失敗')

import pymysql

user = input("username:")
pwd = input("password:")

conn = pymysql.connect(host="localhost",user='root',password='',database="db666")
cursor = conn.cursor()
sql = "select * from userinfo where username=%s and password=%s"
cursor.execute(sql,user,pwd)
# cursor.execute(sql,[user,pwd])
# cursor.execute(sql,{'u':user,'p':pwd})
result = cursor.fetchone()
cursor.close()
conn.close()
if result:
    print('登錄成功')
else:
    print('登錄失敗')

import pymysql

# 增加，刪，該
# conn = pymysql.connect(host="localhost",user='root',password='',database="db666")
# cursor = conn.cursor()
# sql = "insert into userinfo(username,password) values('root','123123')"
# 受影響的行數
# r = cursor.execute(sql)
# #  ******
# conn.commit()
# cursor.close()
# conn.close()

# conn = pymysql.connect(host="localhost",user='root',password='',database="db666")
# cursor = conn.cursor()
# # sql = "insert into userinfo(username,password) values(%s,%s)"
# # cursor.execute(sql,(user,pwd,))
#
# sql = "insert into userinfo(username,password) values(%s,%s)"
# # 受影響的行數
# r = cursor.executemany(sql,[('egon','sb'),('laoyao','BS')])
# #  ******
# conn.commit()
# cursor.close()
# conn.close()




# 查
# conn = pymysql.connect(host="localhost",user='root',password='',database="db666")
# cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
# sql = "select * from userinfo"
# cursor.execute(sql)

# cursor.scroll(1,mode='relative')  # 相對當前位置移動
# cursor.scroll(2,mode='absolute') # 相對絕對位置移動
# result = cursor.fetchone()
# print(result)
# result = cursor.fetchone()
# print(result)
# result = cursor.fetchone()
# print(result)
# result = cursor.fetchall()
# print(result)


# result = cursor.fetchmany(4)
# print(result)
# cursor.close()
# conn.close()




# 新插入數據的自增ID: cursor.lastrowid
# import pymysql
#
# conn = pymysql.connect(host="localhost",user='root',password='',database="db666")
# cursor = conn.cursor()
# sql = "insert into userinfo(username,password) values('asdfasdf','123123')"
# cursor.execute(sql)
# conn.commit()
# print(cursor.lastrowid)
# cursor.close()
# conn.close()