10-pymysql的应用

import pymysql

# user = input('请输入用户名：')
# pwd = input('请输入密码：')

# 1.创建连接
conn = pymysql.connect(host='127.0.0.1', user='root', password="",
                       database='db8', port=3306, charset='utf8')
# 2.创建游标
cur = conn.cursor(cursor=pymysql.cursors.DictCursor)

# sql = "select * from userinfo where name='%s' and pwd='%s'" %(user,pwd)
# sql = "select * from userinfo where name=%s and pwd=%s"
# sql = "select * from userinfo where name=%(user)s and pwd=%(pwd)s"

# 插入数据
# sql = 'insert into userinfo(name,pwd) values(%s,%s)'
# print(sql)

# 3执行sql语句
# r = cur.execute(sql,[user,pwd])
# r = cur.execute(sql,(user,pwd))
# r = cur.execute(sql,{"user":user,"pwd":pwd})

#插入多条数据
# r = cur.executemany(sql, [('李四', '110'), ('王五', '119')])
# print(r)

sql = 'select * from userinfo'
cur.execute(sql)
# row = cur.fetchone()
# print(row)
# row = cur.fetchone()
# print(row)
# row = cur.fetchone()
# print(row)
# row = cur.fetchone()
# print(row)
# row = cur.fetchone()
# print(row)

# rows = cur.fetchmany()
# # print(rows)

rows = cur.fetchall()
print(rows)

# 增 删 改 一定要提交
conn.commit()

# 关闭游标 关闭连接对象
cur.close()
conn.close()

# if r:
#     print('查询成功')
# else:
#     print('查询失败')