pymysql模块的操作实例

import pymysql

conn = pymysql.connect(
  user = 'root',
  password = '123',
  host = '127.0.0.1', # ip地址
  port = 3306,    # 端口
  charset = 'utf8',
  database = 'day36_1'
)
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)# 产生游标对象
# cursor=pymysql.cursors.DictCursor 将查询出来的结果制成字典的形式返回
sql = "select * from userinto"
res = cursor.execute(sql) #执行sql语句

res = cursor.fetchone() # 打印一条数据
res = cursor.fetchall() # 可以打印里面的所有数据
res = cursor.fetchmany(2)  #制定获取几条数据，如果数字超了也不报错

print(res)

cursor.scroll(2, 'relative') #相对移动 , 基于指针所在位置, 往后偏移

cursor.scroll(3, 'absolute') #绝对移动,基于起始位置往后偏移

print(cursor.fetchall())

import pymysql

conn = pymysql.connect(
  user = 'root' ,
  password = '123',
  host = '127.0.0.1',
  port = 3306,
  database = 'day36_1',
  charset = 'utf8'
)
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)

#获取用户名和密码,然后取数据库中校验
username = input('username>>>:').strip()
password = input('password>>>:').strip()
sql = "select * from userinto where name=%s and password=%s"
print(sql)
cursor.execute(sql, (username, password)) #交由execute帮你去做拼接，解决注入问题
res = cursor.fetchall()

if res:
  print(res)
else:
  print('username or password error!')

import pymysql
conn = pymysql.connect(
  user = 'root',
  passwd = '123456',
  db = 'day36',
  host = '127.0.0.1',
  port = 3306,
  charset = 'utf8',
  autocommit = True # 自动提交确认
)
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
# #查： 获取用户输入的用户名和密码 然后取数据库中校验
# username = input('username>>>:').strip()
# password = input('password>>>:').strip()
# # sql = "select * from userinfo where name='%s' and password= '%s'"%(username,password)
# sql = "select * from userinfo where name=%s and password= %s"
# print(sql)

# 增
sql = "insert into userinfo(name,password,dep_id) values('jason',789,1)"
# 改
# sql = "update userinfo set name='egondsb' where id = 6"
# 删除
# sql = "delete from userinfo where id= 1"
res = cursor.execute(sql)
# conn.commit() # 确认当前操作 真正的同步到数据库
print(res)