如何使用python+tkinter实现学生管理系统

from tkinter import *
from tkinter.messagebox import *
import sqlite3
from tkinter import ttk
 
dbstr = "H:\mydb.db"
 
root = Tk()
root.geometry('700x1000')
root.title('学生管理系统')
 
Label(root, text="学号：").place(relx=0, rely=0.05, relwidth=0.1)
Label(root, text="姓名：").place(relx=0.5, rely=0.05, relwidth=0.1)
Label(root, text="电话：").place(relx=0, rely=0.1, relwidth=0.1)
Label(root, text="地址：").place(relx=0.5, rely=0.1, relwidth=0.1)
 
sid = StringVar()
name = StringVar()
phone = StringVar()
address = StringVar()
Entry(root, textvariable=sid).place(relx=0.1, rely=0.05, relwidth=0.37, height=25)
Entry(root, textvariable=name).place(relx=0.6, rely=0.05, relwidth=0.37, height=25)
 
Entry(root, textvariable=phone).place(relx=0.1, rely=0.1, relwidth=0.37, height=25)
Entry(root, textvariable=address).place(relx=0.6, rely=0.1, relwidth=0.37, height=25)
 
Label(root, text='学生信息管理', bg='white', fg='red', font=('宋体', 15)).pack(side=TOP, fill='x')
 
 
def showAllInfo():
 x = dataTreeview.get_children()
 for item in x:
  dataTreeview.delete(item)
 con = sqlite3.connect(dbstr)
 cur = con.cursor()
 cur.execute("select * from student")
 lst = cur.fetchall()
 for item in lst:
  dataTreeview.insert("", 1, text="line1", values=item)
 cur.close()
 con.close()
 
 
def appendInfo():
 if sid.get() == "":
  showerror(title='提示', message='输入不能为空')
 elif name.get() == "":
  showerror(title='提示', message='输入不能为空')
 elif phone.get() == "":
  showerror(title='提示', message='输入不能为空')
 elif address.get() == "":
  showerror(title='提示', message='输入不能为空')
 else:
  x = dataTreeview.get_children()
  for item in x:
   dataTreeview.delete(item)
  list1 = []
  list1.append(sid.get())
  list1.append(name.get())
  list1.append(phone.get())
  list1.append(address.get())
  con = sqlite3.connect(dbstr)
  cur = con.cursor()
  cur.execute("insert into student values(?,?,?,?)", tuple(list1))
  con.commit()
  cur.execute("select * from student")
  lst = cur.fetchall()
  for item in lst:
   dataTreeview.insert("", 1, text="line1", values=item)
  cur.close()
  con.close()
 
 
def deleteInfo():
 con = sqlite3.connect(dbstr)
 cur = con.cursor()
 cur.execute("select * from student")
 studentList = cur.fetchall()
 cur.close()
 con.close()
 print(studentList)
 
 num = sid.get()
 flag = 0
 if num.isnumeric() == False:
  showerror(title='提示', message='删除失败')
 for i in range(len(studentList)):
  for item in studentList[i]:
   if int(num) == item:
    flag = 1
    con = sqlite3.connect(dbstr)
    cur = con.cursor()
    cur.execute("delete from student where id = ?", (int(num),))
    con.commit()
    cur.close()
    con.close()
    break
 if flag == 1:
  showinfo(title='提示', message='删除成功！')
 else:
  showerror(title='提示', message='删除失败')
 
 x = dataTreeview.get_children()
 for item in x:
  dataTreeview.delete(item)
 
 con = sqlite3.connect(dbstr)
 cur = con.cursor()
 cur.execute("select * from student")
 lst = cur.fetchall()
 for item in lst:
  dataTreeview.insert("", 1, text="line1", values=item)
 cur.close()
 con.close()
 
 
Button(root, text="显示所有信息", command=showAllInfo).place(relx=0.2, rely=0.2, width=100)
Button(root, text="追加信息", command=appendInfo).place(relx=0.4, rely=0.2, width=100)
Button(root, text="删除信息", command=deleteInfo).place(relx=0.6, rely=0.2, width=100)
 
 
dataTreeview = ttk.Treeview(root, show='headings', column=('sid', 'name', 'phone', 'address'))
dataTreeview.column('sid', width=150, anchor="center")
dataTreeview.column('name', width=150, anchor="center")
dataTreeview.column('phone', width=150, anchor="center")
dataTreeview.column('address', width=150, anchor="center")
 
dataTreeview.heading('sid', text='学号')
dataTreeview.heading('name', text='名字')
dataTreeview.heading('phone', text='电话')
dataTreeview.heading('address', text='地址')
 
dataTreeview.place(rely=0.3, relwidth=0.97)