所以，我目前正在制作一个作为BMI计算器的程序，你可以在其中输入你的体重和身高，然后输出它作为BMI和你的体重组，并可以选择将结果记录到数据库，然后您可以返回并检查以前的结果。我在尝试从数据库获取信息并将其放入GUI以供用户查看时遇到问题。将数据写入数据库是我已经出售的问题。我正在为我的数据库使用 sqlite3 ，为我的GUI使用 Tkinter 。我怎么能把这个函数添加到我的代码中？这是我目前的代码
from Tkinter import *
import sqlite3
import time
import datetime
conn = sqlite3.connect('bmidatabase.db')
c = conn.cursor()
class Welcome():
#This is the class defining the first welcoming window. This window is used to navigate between previous weights and the calculator.
def __init__(self,master):
#This is the GUI for the starting Menu area. Features three buttons for navigating towards the BMI Calculator, the Records where we have to store variables entered and the exit#
self.master=master
self.master.geometry('170x110+100+200')
self.master.title('Welcome!')
self.label1=Label(self.master,text='Welcome to the BMI Calculator',fg='red').grid(row=0,column=1)
self.button1=Button(self.master,text="BMI Calculator",fg='green',command=self.gotobmicalculator).grid(row=1,column=1)
self.button2=Button(self.master,text="Records",fg='blue',command=self.gotorecords).grid(row=2,column=1)
self.button3=Button(self.master,text="Exit",fg='red',command=self.exit).grid(row=3,column=1)
def exit(self):
#Exit protocol for the exit button. This part is completely done.#
self.master.destroy()
def gotobmicalculator(self):
#This is the BMI Calculator GUI#
root2=Toplevel(self.master)
myGUI=bmicalculator(root2)
def gotorecords(self):
#This is where the previous records of BMI will be kept, hasn't been put in yet#
root2=Toplevel(self.master)
mygui=records(root2)
class bmicalculator():
#class created for the bmi calculator GUI and processing the numbers (pain in the ass to make)#
def __init__(self,master):
c.execute('CREATE TABLE IF NOT EXISTS BMIStorage(timestamp TEXT,bodymassindex REAL,weightclass TEXT)')
self.heightcm=DoubleVar()
self.weightkg=DoubleVar()
self.master=master
self.master.geometry('250x200+100+200')
self.master.title('BMI Calculator')
self.label2=Label(self.master,text='Welcome to the BMI Calculator',fg='red').grid(row=0,column=0)
self.label2=Label(self.master,text='Please enter your height in centimetres',fg='black').grid(row=3,column=0)
self.label2=Label(self.master,text='Please enter your weight in kilograms',fg='black').grid(row=4,column=0)
self.myheight=Entry(self.master,textvariable=self.heightcm).grid(row=3,column=1)
self.myweight=Entry(self.master,textvariable=self.weightkg).grid(row=4,column=1)
self.button4=Button(self.master,text="Calculate BMI",fg='red',command=self.bmicalculation).grid(row=7,column=0)
self.button5=Button(self.master,text="Exit",fg='red',command=self.exit).grid(row=9,column=0)
def bmicalculation(self):
bmiheight=self.heightcm.get()
print bmiheight
bmiweight=self.weightkg.get()
bmi= float((bmiweight)/((bmiheight / 100)**2))
self.bmi = bmi
print bmi
self.label1=Label(self.master,text='Your BMI is %.2f' % bmi).grid(row=5,column=0)
if bmi <= 18.5:
self.label2=Label(self.master,text='This places you in the underweight group.',fg='blue').grid(row=6,column=0)
totalindex = 'underweight'
self.totalindex = totalindex
elif bmi >18.5 and bmi <25:
self.label3=Label(self.master,text='This places you in the healthy weight group.',fg='green').grid(row=6,column=0)
totalindex = 'healthy'
self.totalindex = totalindex
elif bmi >= 25 and bmi < 30:
self.label4=Label(self.master,text='This places you in the overweight group.',fg='orange').grid(row=6,column=0)
totalindex = 'overweight'
self.totalindex = totalindex
elif bmi >=30:
self.label5=Label(self.master,text='This places you in the obese group.',fg='red').grid(row=6,column=0)
totalindex = 'obese'
self.totalindex = totalindex
if bmi >0 and bmi <999999999999999999999:
self.button6=Button(self.master,text="Store Data",fg='red',command=self.dynamic_data_entry).grid(row=8,column=0)
def dynamic_data_entry(self):
global dynamic_data_entry
#this is what adds the data to the database. Bmi has to be changed to the value of bmi and weightclass has to be change to the weightclass
timestamp = str(datetime.datetime.now().date())
bodymassindex = self.bmi
weightclass = self.totalindex
c.execute("INSERT INTO BMIStorage (timestamp, bodymassindex, weightclass) VALUES (?, ?, ?)",(timestamp, bodymassindex, weightclass))
conn.commit()
self.writetodatabase()
def writetodatabase(self):
for i in range(1):
time.sleep(1)
c.close()
conn.close()
def exit(self):
#Exit protocol for the exit button. This part is completely done.#
self.master.destroy()
class records():
#class created to see records that have been previously inputted#
def __init__(self,master):
self.master=master
self.master.geometry('250x200+100+200')
self.master.title('Records')
def main():
root=Tk()
myGUIWelcome=Welcome(root)
root.mainloop()
if __name__ == '__main__':
main()
对此有任何帮助将非常感激，我在这一点上非常困难！ 谢谢，Ben
答案 0 :(得分：2)
Tkinter本身不提供表格小部件，但您可以使用grid并在其中插入标签。要从数据库中获取所有数据，您只需要执行查询SELECT * FROM <Table>，然后使用.fetchall()获得带有duble的列表。这是您的records班级：
class records():
#class created to see records that have been previously inputted#
def __init__(self,master):
self.master=master
self.master.geometry('250x200+100+200')
self.master.title('Records')
self.connection = sqlite3.connect('bmidatabase.db')
self.cur = self.connection.cursor()
self.dateLabel = Label(self.master, text="Date", width=10)
self.dateLabel.grid(row=0, column=0)
self.BMILabel = Label(self.master, text="BMI", width=10)
self.BMILabel.grid(row=0, column=1)
self.stateLabel = Label(self.master, text="Status", width=10)
self.stateLabel.grid(row=0, column=2)
self.showallrecords()
def showallrecords(self):
data = self.readfromdatabase()
for index, dat in enumerate(data):
Label(self.master, text=dat[0]).grid(row=index+1, column=0)
Label(self.master, text=dat[1]).grid(row=index+1, column=1)
Label(self.master, text=dat[2]).grid(row=index+1, column=2)
def readfromdatabase(self):
self.cur.execute("SELECT * FROM BMIStorage")
return self.cur.fetchall()
由于您已关闭与数据库的连接（这是一个错误，因为您无法计算另一个BMI），我们需要再次打开它。之后，我们创建一个带有标签的“标题”到网格布局中。请注意，我们在单独的行上使用grid。这样做的原因是，如果我们写self.ourLabel = Label().grid()，我们将从None - 方法返回grid，并且不能将该引用用于将来的目的。因此，您需要更正其他代码。之后，我们从数据库中获取所有数据，并为每一行创建3个标签。