import pymysql 
# 连接到数据库

db = pymysql.connect(
    host = '47.98.173.29',
    user='root',
    passwd='123456',
    db='practice',
    port=3306,
    charset='utf8')
# 游标
cursor = db.cursor()

# 执行
# try:
#   sql = '''insert into tbcourse values
#   (7777, 'c++程序设计', 3, '大师级讲师授课需要抢位；')'''
#   cursor.execute(sql)
#   # 提交
#   db.commit()
# except:
#   # 回滚(回滚泛指程序更新失败, 返回上一次正确状态的行为。)
#   db.rollback()

try:
    sql = '''delect from tbstudent where stuid=1001; '''
    cursor.execute(sql)
    db.commit()
except:
    db.rollback()

# 结果
sql = 'select * from tbstudent'
cursor.execute(sql)
data = cursor.fetchall()
for i in data:
    print(i)
# 关闭
db.close()