# 第十周
# 例题
# SQLite连接方式
# import sqlite3
# conn = sqlite3.connect("数据库.db")


# mysql连接方式
# pip install pymysql --trusted-host mirrors.aliyun.com
# import pymysql
# conn = pymysql.connect(host='localhost',
#                             port=3306,
#                             user='username',
#                             password='password',
#                             db='database',
#                             charset='utf8')

# sql server连接方式
# pip install pymssql --trusted-host mirrors.aliyun.com
# import pymssql
# conn = pymssql.connect(server='localhost',
#                        user='username',
#                        password='password',
#                        database='database')


# import xlrd
# import pymysql
# def read_excel(file_name):
#     wb = xlrd.open_workbook(file_name)
#     sheet = wb.sheet_by_index(0)
#     schools = []
#     for row in range(1, sheet.nrows):
#         school = []
#         for col in range(sheet.ncols):
#             school.append(sheet.cell_value(row,col))
#         schools.append(school)
#     return schools


# def insert_data(schools):
#     conn = pymysql.connect(host='localhost',
#                            port=3306,
#                            user='root',
#                            password='123456',
#                            database='test',
#                            charset='utf8')
#     cursor = conn.cursor()
#     insert_sql = """
#     insert into school(school_code, school_name, province, is_985, is_211, is_self_marking, school_type)
#     values (%s, %s, %s, %s, %s, %s, %s)
#         """
#     for school in schools:
#         cursor.execute(insert_sql, school)
#     conn.commit()
#     cursor.close()
#     conn.close()
#
# school_datas = read_excel("school.xls")
# insert_data(school_datas)





# # 课后练习
# 已知某个班级的某次考试成绩信息包括学号、语文、数学、英语、总分，
# 该成绩信息保存在一张Excel表中，部分信息如图所示，现在要求将其读入到数据库中去。同时实现以下功能：
# # 创建数据表score, 读取excel中数据到数据库表中
# import xlrd
# import sqlite3
# def read_excels(file_name):          #读取Excel文件
#     wb = xlrd.open_workbook(file_name)       #打开Excel文件，返回的是一个工作簿
#     sheet = wb.sheet_by_index(0)     #由工作簿得到表单
#     students = []                #由行和列来获取文件中的信息，用列表students保存
#     for row in range(1, sheet.nrows):
#         student = []
#         for col in range(sheet.ncols):
#             student.append(transform(sheet.cell_value(row, col)))
#         students.append(student)
#     return students
# #
# def transform(data):        # 返回的成绩是浮点数，尝试转换成整型
#     try:
#         return int(data)
#     except:                  #  不能转换原样返回
#         return data
# #
# def init_db():                # 新建数据库
#     pass

# def insert(students):      # 插入数据
#     pass

# init_db()    # 调用函数新建数据库
# students = read_excels("学生成绩表.xls")    # 调用函数插入数据
# insert(students)
#

# 格式化输出
# def print_data(datas):                # 打印结果
#     print("{:^8}{:^8}{:^8}{:^8}{:^8}".format("num", "chinese", "math", "english", "total"))
#     for data in datas:
#         print("{:^8}{:^8}{:^8}{:^8}{:^8}".format(data[0], data[1], data[2], data[3], data[4]))
#

# # 1.按照总分排序

# # 2.获取所有存在不及格科目的学生记录

# # 3.获取指定科目的最高分、最低分以及平均分

# # 4.查询三科都及格的学生信息

# # 5.将所有学生的数学成绩都加5分

# # 6.删除语文不及格的学生记录，并打印删除了多少条记录