Table of contents
The specific code implementation process:
Import os and sqlite3 packages:
Close and submit data to the database:
Add and insert data into the database:
Delete data and update the database:
Student performance statistics:
This article is to increase the database function on the basis of the full version of the previous student information and performance management system (Python). We use the database directly and connect to Sqlite.
functional module:
The core functional modules are as follows:
Run a functional demo:
After the student information management system is started, it first enters the main interface of the system, and waits for the user to input commands to select the corresponding functions.
If the user enters the "info" command, it will enter the student basic information management sub-function module.
In the student basic information management interface, the user can add, delete, modify and display the basic student information by inputting corresponding commands.
Student Basic Information Menu
Add student information
delete student information
Modify student information
display student information
If the user enters the "score" command, it will enter the student achievement management sub-function module.
In the student achievement management interface, the user can select the corresponding function for achievement processing.
The average score:
Maximum
Lowest score
The specific code implementation process:
create sqlite database
Create a sqlite database directly in Pycharm, named StuDB.
Both name and File are filled with StuDB.
Successfully created the database
Python code
Create a new Python file: Student Information Management (sqlite).py
Import os and sqlite3 packages:
import os
import sqlite3Define a main class: StuDB, and then implement specific functional functions in the class.
Initialize the database:
def __init__(self):
self.con = ''
self.cur = ''Connect to the database:
def connect(self,db):
self.con = sqlite3.connect(db)
self.cur = self.con.cursor()
try:
sql = '''
create table student (
no text,
name text,
chinese integer,
math integer,
english integer )
'''
self.cur.execute(sql)
except:
passClose and submit data to the database:
def close(self):
self.con.commit()
self.cur.close()
self.con.close()Query data and display:
def show(self):
format_head = '{:8}\t{:8}\t{:8}\t{:8}\t{:8}'
print(format_head.format('学号','姓名','语文','数学','英语'))
sql = 'select * from student'
self.cur.execute(sql)
rows = self.cur.fetchall()
format_con = '{:8}\t{:8}\t{:<8}\t{:<8}\t{:<8}'
for row in rows:
print(format_con.format(row[0],row[1],row[2],row[3],row[4]))Add and insert data into the database:
def __insert(self,no,name,chinese,math,english):
sql='insert into student(no,name,chinese,math,english) values(?,?,?,?,?)'
self.cur.execute(sql,(no,name,chinese,math,english))
if self.cur.rowcount > 0:
print('插入成功')
else:
print('插入失败')
def insert(self):
while True:
no = input('学号：')
if self.__exists(no):
print('该学号已存在')
else:
name = input('姓名：')
chinese = self.__enterScore('语文成绩:')
math = self.__enterScore('数学成绩:')
english = self.__enterScore('英语成绩:')
if no != '' and name != '':
self.__insert(no,name,chinese,math,english)
else:
print('请将信息输入完整')
choice = input('继续添加(y/n)?').lower()
if choice == 'n':
break Update data to the database:
def __update(self,no,name,chinese,math,english):
sql='update student set name=?,chinese=?,math=?,english=? where no=?'
self.cur.execute(sql,(name,chinese,math,english,no))
if self.cur.rowcount > 0:
print('修改成功')
else:
print('修改失败')
def update(self):
while True:
no = input('请输入要修改的学号:')
if not self.__exists(no):
print('该学号不存在')
else:
name = input('姓名：')
chinese = self.__enterScore('语文成绩:')
math = self.__enterScore('数学成绩:')
english = self.__enterScore('英语成绩:')
if no != '' and name != '' :
self.__update(no,name,chinese,math,english)
else:
print('请将信息输入完整')
choice = input('继续修改(y/n)?').lower()
if choice == 'n':
breakDelete data and update the database:
def __delete(self,no):
sql = 'delete from student where no = ?'
self.cur.execute(sql,(no,))
if self.cur.rowcount > 0:
print('删除成功')
else:
print('删除失败')
def delete(self):
while True:
no = input('请输入要删除的学号：')
if not self.__exists(no):
print('该学号不存在')
else:
self.__delete(no)
choice = input('继续删除(y/n)?').lower()
if choice == 'n':
breakImport and export data
def save(self):
fn = input('请输入要导出的文件名:')
with open(fn,'w',encoding = 'utf-8') as fp:
self.cur.execute('select * from student')
rows = self.cur.fetchall()
for row in rows:
fp.write(row[0] + ',' )
fp.write(row[1] + ',' )
fp.write(str(row[2]) + ',' )
fp.write(str(row[3]) + ',' )
fp.write(str(row[4])+ '\n')
print('导出完毕')
def load(self):
fn = input('请输入要导入的文件名:')
if os.path.exists(fn):
with open(fn,'r',encoding = 'utf-8') as fp:
while True:
s = fp.readline().strip('\n')
if s == '':
break
stu = s.split(',')
no = stu[0]
name = stu[1]
chinese = int(stu[2])
math = int(stu[3])
english = int(stu[4])
if self.__exists(no):
print('该学生已存在')
else:
self.__insert(no,name,chinese,math,english)
print('导入完毕')
else:
print('要导入的文件不存在')Student performance statistics:
def scoreavg(self):
sql = 'select avg(chinese),avg(math),avg(english) from student'
self.cur.execute(sql)
result = self.cur.fetchone()
print('语文成绩平均分是：%.2f'%result[0])
print('数学成绩平均分是：%.2f'%result[1])
print('英语成绩平均分是：%.2f'%result[2])
def scoremax(self):
sql = 'select max(chinese),max(math),max(english) from student'
self.cur.execute(sql)
result = self.cur.fetchone()
print('语文成绩最高分是：%d'%result[0])
print('数学成绩最高分是：%d'%result[1])
print('英语成绩最高分是：%d'%result[2])
def scoremin(self):
sql = 'select min(chinese),min(math),min(english) from student'
self.cur.execute(sql)
result = self.cur.fetchone()
print('语文成绩最低分是：%d'%result[0])
print('数学成绩最低分是：%d'%result[1])
print('英语成绩最低分是：%d'%result[2])Main function and menu function:
def main(self,db):
while True:
print('学生信息管理系统(数据库版)'.center(20,'='))
print('info -------学生基本信息管理')
print('score -------学生成绩统计')
print('exit -------退出系统')
print(''.center(32,'='))
s = input('main>').strip().lower()
if s == 'info':
self.infoprocess(db)
elif s == 'score':
self.scoreprocess(db)
elif s == 'exit':
break
else:
print('输入错误')
def infoprocess(self,db):
self.connect(db)
print('学生基本信息管理'.center(24,'='))
print('load -----------导入学生数据')
print('insert -----------插入学生信息')
print('delete -----------删除学生信息')
print('update -----------修改学生信息')
print('show -----------显示学生信息')
print('save -----------导出学生数据')
print('return -----------返回并更新数据库')
print(''.center(32,'='))
while True:
s = input('info>').strip().lower()
if s == 'load':
self.load()
elif s == 'insert':
self.insert()
elif s == 'delete':
self.delete()
elif s == 'update':
self.update()
elif s == 'show':
self.show()
elif s == 'save':
self.save()
elif s =='return':
break
else:
print('输入错误')
self.close()
def scoreprocess(self,db):
self.connect(db)
print('学生成绩统计'.center(24,'='))
print('avg --------课程平均分')
print('max --------课程最高分')
print('min --------课程最低分')
print('return --------返回')
print(''.center(30,'='))
while True:
s = input('score>').strip().lower()
if s == 'avg':
self.scoreavg()
elif s == 'max':
self.scoremax()
elif s == 'min':
self.scoremin()
elif s == 'return':
break
else:
print('输入错误')
self.close()
Associated database files:
Finally, define the function separately to specify the file address of the database connected this time.
if __name__ == '__main__':
sd = StuDB()
sd.main('数据库文件夹路径\StuDB')
Full code:
import os
import sqlite3
class StuDB:
def __init__(self):
self.con = ''
self.cur = ''
def connect(self,db):
self.con = sqlite3.connect(db)
self.cur = self.con.cursor()
try:
sql = '''
create table student (
no text,
name text,
chinese integer,
math integer,
english integer )
'''
self.cur.execute(sql)
except:
pass
def close(self):
self.con.commit()
self.cur.close()
self.con.close()
def show(self):
format_head = '{:8}\t{:8}\t{:8}\t{:8}\t{:8}'
print(format_head.format('学号','姓名','语文','数学','英语'))
sql = 'select * from student'
self.cur.execute(sql)
rows = self.cur.fetchall()
format_con = '{:8}\t{:8}\t{:<8}\t{:<8}\t{:<8}'
for row in rows:
print(format_con.format(row[0],row[1],row[2],row[3],row[4]))
def __enterScore(self,message):
while True:
try:
score = input(message)
if 0 <= int(score) <= 100:
break
else:
print('输入错误，成绩应在0到100之间')
except:
print('输入错误，成绩应在0到100之间')
return int(score)
def __exists(self,no):
sql = 'select * from student where no = ?'
result = self.cur.execute(sql,(no,))
rows = result.fetchall()
if len(rows) > 0:
return True
else:
return False
def __insert(self,no,name,chinese,math,english):
sql='insert into student(no,name,chinese,math,english) values(?,?,?,?,?)'
self.cur.execute(sql,(no,name,chinese,math,english))
if self.cur.rowcount > 0:
print('插入成功')
else:
print('插入失败')
def __update(self,no,name,chinese,math,english):
sql='update student set name=?,chinese=?,math=?,english=? where no=?'
self.cur.execute(sql,(name,chinese,math,english,no))
if self.cur.rowcount > 0:
print('修改成功')
else:
print('修改失败')
def __delete(self,no):
sql = 'delete from student where no = ?'
self.cur.execute(sql,(no,))
if self.cur.rowcount > 0:
print('删除成功')
else:
print('删除失败')
def insert(self):
while True:
no = input('学号：')
if self.__exists(no):
print('该学号已存在')
else:
name = input('姓名：')
chinese = self.__enterScore('语文成绩:')
math = self.__enterScore('数学成绩:')
english = self.__enterScore('英语成绩:')
if no != '' and name != '':
self.__insert(no,name,chinese,math,english)
else:
print('请将信息输入完整')
choice = input('继续添加(y/n)?').lower()
if choice == 'n':
break
def delete(self):
while True:
no = input('请输入要删除的学号：')
if not self.__exists(no):
print('该学号不存在')
else:
self.__delete(no)
choice = input('继续删除(y/n)?').lower()
if choice == 'n':
break
def update(self):
while True:
no = input('请输入要修改的学号:')
if not self.__exists(no):
print('该学号不存在')
else:
name = input('姓名：')
chinese = self.__enterScore('语文成绩:')
math = self.__enterScore('数学成绩:')
english = self.__enterScore('英语成绩:')
if no != '' and name != '' :
self.__update(no,name,chinese,math,english)
else:
print('请将信息输入完整')
choice = input('继续修改(y/n)?').lower()
if choice == 'n':
break
def save(self):
fn = input('请输入要导出的文件名:')
with open(fn,'w',encoding = 'utf-8') as fp:
self.cur.execute('select * from student')
rows = self.cur.fetchall()
for row in rows:
fp.write(row[0] + ',' )
fp.write(row[1] + ',' )
fp.write(str(row[2]) + ',' )
fp.write(str(row[3]) + ',' )
fp.write(str(row[4])+ '\n')
print('导出完毕')
def load(self):
fn = input('请输入要导入的文件名:')
if os.path.exists(fn):
with open(fn,'r',encoding = 'utf-8') as fp:
while True:
s = fp.readline().strip('\n')
if s == '':
break
stu = s.split(',')
no = stu[0]
name = stu[1]
chinese = int(stu[2])
math = int(stu[3])
english = int(stu[4])
if self.__exists(no):
print('该学生已存在')
else:
self.__insert(no,name,chinese,math,english)
print('导入完毕')
else:
print('要导入的文件不存在')
def scoreavg(self):
sql = 'select avg(chinese),avg(math),avg(english) from student'
self.cur.execute(sql)
result = self.cur.fetchone()
print('语文成绩平均分是：%.2f'%result[0])
print('数学成绩平均分是：%.2f'%result[1])
print('英语成绩平均分是：%.2f'%result[2])
def scoremax(self):
sql = 'select max(chinese),max(math),max(english) from student'
self.cur.execute(sql)
result = self.cur.fetchone()
print('语文成绩最高分是：%d'%result[0])
print('数学成绩最高分是：%d'%result[1])
print('英语成绩最高分是：%d'%result[2])
def scoremin(self):
sql = 'select min(chinese),min(math),min(english) from student'
self.cur.execute(sql)
result = self.cur.fetchone()
print('语文成绩最低分是：%d'%result[0])
print('数学成绩最低分是：%d'%result[1])
print('英语成绩最低分是：%d'%result[2])
def main(self,db):
while True:
print('学生信息管理系统(数据库版)'.center(20,'='))
print('info -------学生基本信息管理')
print('score -------学生成绩统计')
print('exit -------退出系统')
print(''.center(32,'='))
s = input('main>').strip().lower()
if s == 'info':
self.infoprocess(db)
elif s == 'score':
self.scoreprocess(db)
elif s == 'exit':
break
else:
print('输入错误')
def infoprocess(self,db):
self.connect(db)
print('学生基本信息管理'.center(24,'='))
print('load -----------导入学生数据')
print('insert -----------插入学生信息')
print('delete -----------删除学生信息')
print('update -----------修改学生信息')
print('show -----------显示学生信息')
print('save -----------导出学生数据')
print('return -----------返回并更新数据库')
print(''.center(32,'='))
while True:
s = input('info>').strip().lower()
if s == 'load':
self.load()
elif s == 'insert':
self.insert()
elif s == 'delete':
self.delete()
elif s == 'update':
self.update()
elif s == 'show':
self.show()
elif s == 'save':
self.save()
elif s =='return':
break
else:
print('输入错误')
self.close()
def scoreprocess(self,db):
self.connect(db)
print('学生成绩统计'.center(24,'='))
print('avg --------课程平均分')
print('max --------课程最高分')
print('min --------课程最低分')
print('return --------返回')
print(''.center(30,'='))
while True:
s = input('score>').strip().lower()
if s == 'avg':
self.scoreavg()
elif s == 'max':
self.scoremax()
elif s == 'min':
self.scoremin()
elif s == 'return':
break
else:
print('输入错误')
self.close()
if __name__ == '__main__':
sd = StuDB()
sd.main('数据库所在文件夹\StuDB')