# coding: utf-8
import sqlite3# 导入数据库
def connect_sql():connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()cursor.execute("""CREATE TABLE studentsab51
(id INTEGER PRIMARY KEY,name TEXT,sex TEXT,age INTEGER,phone TEXT
);""")connect.commit()cursor.close()connect.close()# 展示学生列表
def show_students():print('ID','\t\t', '姓名''\t\t', '性别''\t\t', '年龄''\t\t', '电话')print('---'*20)connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()cursor.execute("""SELECT * FROM students;""")students_list = cursor.fetchall()for index, student in enumerate(students_list):print(f'{index+1}\t\t\t{student[1]}\t\t\t{student[2]}\t\t\t{student[3]}\t\t\t{student[4]}')connect.commit()cursor.close()connect.close()# 添加学生
def add_student():name = input('新学生姓名：')sex = input('新学生性别：')age = input('新学生年龄：')phone = input('新学生电话')connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()# sql=("""# INSERT  INTO  students(name, sex, age, phone) VALUES ("%s", "%s",%s, "%s")# """%(name, sex, age , phone))sql = f"""INSERT INTO students (name, sex, age, phone)  VALUES ("{name}","{sex}",{age},"{phone}")"""print(sql)cursor.execute(sql)connect.commit()connect.close()# 修改
def update_student():show_students()connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()new_id = input("请输入你想要修改的编号:")new_name=input('请输入修改后的姓名:')new_sex=input('请输入修改后的性别：')new_age = input('请输入新的年龄：')new_phone = input('请输入新电话')# 先查询输入的学生id是否存在，存在的话更新，不存在的给出用户提示sql = f"""SELECT 1 FROM students WHERE id="{new_id}";"""cursor.execute(sql)student = cursor.fetchall()if student:sql2 = f"""UPDATE students SET name = "{new_name}",sex="{new_sex}",age="{new_age}",phone="{new_phone}"  WHERE id="{new_id}";"""cursor.execute(sql2)connect.commit()else:print('学生不存在，请重新操作。')connect.close()print('学生修改成功')# 下面的方法也行 看你用哪种# cursor.execute("""UPDATE students SET name=?, sex= ?,age=?,phone=? WHERE id="""+new_id,(new_name, new_sex, new_age, new_phone))# connect.commit()# connect.close()# 删除
def delete_student():connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()print(""" 删除> 请输入子操作编号：1）按学生编号删除2）删除全部学生（clear） """)sub_select = int(input('请选择子操作：'))if sub_select == 1:show_students()stu_name = input('要删除的学生姓名：')delete_name = f""" delete from students where name='{stu_name}'"""cursor.execute(delete_name)connect.commit()connect.close()print('删除成功')elif sub_select == 2:connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()confirm = input('要删除全部学生？( Y/y):')if confirm == 'y':clear_as = f"""DELETE FROM  main.students;"""cursor.execute(clear_as)connect.commit()connect.close()print('删除全部成功')def main():# 主函数，程序入口while True:print("""欢迎使用学生管理系统1-查看学员姓名2-添加学员姓名3-修改学员姓名4-删除学员姓名0-退出程序""")num = int(input('请输入操作编号：'))if num == 1:show_students()elif num == 2:add_student()elif num == 3:update_student()elif num == 4:delete_student()elif num == 0:breakif __name__ == '__main__':main()# 可能出现的错误：
# 插入功能
# sql = """
#         INSERT INTO students (name, sex, age, phone) VALUES (%s, %s, %d, %s);
#     """ % (name, sex, int(age), phone)
#     print(sql)
# 报错 sqlite3.OperationalError: no such column: aaa
# 原因 sql INSERT INTO students (name, sex, age, phone) VALUES (aaa, nan, 13, 13000);   值并不是sql解释器理解的字符串。
# 解决 %s两侧加引号。 INSERT INTO students (name, sex, age, phone) VALUES ("%s", %s, %d, %s) % (name, sex, int(age), phone);# sql补充
# SELECT 1 FROM students WHERE name="{stu_name}";    -- 只关心一行数据是否存在。效率比select * 高。

# coding: utf-8
import sqlite3# 导入数据库
def connect_sql():connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()cursor.execute("""CREATE TABLE studentsab51
(id INTEGER PRIMARY KEY,name TEXT,sex TEXT,age INTEGER,phone TEXT
);""")connect.commit()cursor.close()connect.close()# 展示学生列表
def show_students():print('ID','\t\t', '姓名''\t\t', '性别''\t\t', '年龄''\t\t', '电话')print('---'*20)connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()cursor.execute("""SELECT * FROM students;""")students_list = cursor.fetchall()for index, student in enumerate(students_list):print(f'{index+1}\t\t\t{student[1]}\t\t\t{student[2]}\t\t\t{student[3]}\t\t\t{student[4]}')connect.commit()cursor.close()connect.close()# 添加学生
def add_student():name = input('新学生姓名：')sex = input('新学生性别：')age = input('新学生年龄：')phone = input('新学生电话')connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()# sql=("""# INSERT  INTO  students(name, sex, age, phone) VALUES ("%s", "%s",%s, "%s")# """%(name, sex, age , phone))sql = f"""INSERT INTO students (name, sex, age, phone)  VALUES ("{name}","{sex}",{age},"{phone}")"""print(sql)cursor.execute(sql)connect.commit()connect.close()# 修改
def update_student():show_students()connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()new_id = input("请输入你想要修改的编号:")new_name=input('请输入修改后的姓名:')new_sex=input('请输入修改后的性别：')new_age = input('请输入新的年龄：')new_phone = input('请输入新电话')# 先查询输入的学生id是否存在，存在的话更新，不存在的给出用户提示sql = f"""SELECT 1 FROM students WHERE id="{new_id}";"""cursor.execute(sql)student = cursor.fetchall()if student:sql2 = f"""UPDATE students SET name = "{new_name}",sex="{new_sex}",age="{new_age}",phone="{new_phone}"  WHERE id="{new_id}";"""cursor.execute(sql2)connect.commit()else:print('学生不存在，请重新操作。')connect.close()print('学生修改成功')# 下面的方法也行 看你用哪种# cursor.execute("""UPDATE students SET name=?, sex= ?,age=?,phone=? WHERE id="""+new_id,(new_name, new_sex, new_age, new_phone))# connect.commit()# connect.close()# 删除
def delete_student():connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()print(""" 删除> 请输入子操作编号：1）按学生编号删除2）删除全部学生（clear） """)sub_select = int(input('请选择子操作：'))if sub_select == 1:show_students()stu_name = input('要删除的学生姓名：')delete_name = f""" delete from students where name='{stu_name}'"""cursor.execute(delete_name)connect.commit()connect.close()print('删除成功')elif sub_select == 2:connect = sqlite3.connect("test_sqlite.db")cursor = connect.cursor()confirm = input('要删除全部学生？( Y/y):')if confirm == 'y':clear_as = f"""DELETE FROM  main.students;"""cursor.execute(clear_as)connect.commit()connect.close()print('删除全部成功')def main():# 主函数，程序入口while True:print("""欢迎使用学生管理系统1-查看学员姓名2-添加学员姓名3-修改学员姓名4-删除学员姓名0-退出程序""")num = int(input('请输入操作编号：'))if num == 1:show_students()elif num == 2:add_student()elif num == 3:update_student()elif num == 4:delete_student()elif num == 0:breakif __name__ == '__main__':main()# 可能出现的错误：
# 插入功能
# sql = """
#         INSERT INTO students (name, sex, age, phone) VALUES (%s, %s, %d, %s);
#     """ % (name, sex, int(age), phone)
#     print(sql)
# 报错 sqlite3.OperationalError: no such column: aaa
# 原因 sql INSERT INTO students (name, sex, age, phone) VALUES (aaa, nan, 13, 13000);   值并不是sql解释器理解的字符串。
# 解决 %s两侧加引号。 INSERT INTO students (name, sex, age, phone) VALUES ("%s", %s, %d, %s) % (name, sex, int(age), phone);# sql补充
# SELECT 1 FROM students WHERE name="{stu_name}";    -- 只关心一行数据是否存在。效率比select * 高。