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[英]how to save a drawing which i have made in tkinter canvas IN sqlite3 database and then again fetch it on canvas
[英]Using sqlite3 and tkinter i have made this small inventory management system, the problem is the entry to the database is always null
该代码不会添加新元素,而是将空白值添加到数据库中。 使困惑!
def ProEntry():
def makeEntry(name,date,dept,amt,amt2,lab,thr):
conn = sqlite3.connect("database.db")
cur = conn.cursor()
cur.execute("INSERT INTO products VALUES(?,?,?,?,?,?,?)",(name.get(), date.get(), dept.get(), amt.get(), amt2.get(), lab.get(), thr.get()))
conn.commit()
conn.close()
从这里我开始使用条目小部件向 gui 添加值
entrywindow = Tk()
entrywindow.title("New Product Entry")
namedisp = Label(entrywindow, text="Name Of Product").grid(row=0, column=0)
name = StringVar()
nameentry = Entry(entrywindow, textvariable=name).grid(row=0, column=1)
为了检查单个变量,我使用 name.get() 打印了名称,但这也输出了 null 值。
print(name.get())
datedisp = Label(entrywindow, text="Date of Purchase (YYYY-MM-DD)").grid(row=1, column=0)
date = StringVar()
dateentry = Entry(entrywindow, textvariable=date).grid(row=1, column=1)
deptdisp = Label(entrywindow, text="Name Of Department(s) seperate with ','").grid(row=2, column=0)
dept = StringVar()
deptentry = Entry(entrywindow, textvariable=dept).grid(row=2, column=1)
amtdisp = Label(entrywindow, text="Amount Purchased").grid(row=3, column=0)
amt = StringVar()
amtentry = Entry(entrywindow, textvariable=amt).grid(row=3, column=1)
amt2disp = Label(entrywindow, text="Amount Installed").grid(row=4, column=0)
amt2 = StringVar()
amt2entry = Entry(entrywindow, textvariable=amt2).grid(row=4, column=1)
labdisp = Label(entrywindow, text="Room number Of Lab(s) seperate with ','").grid(row=5, column=0)
lab = StringVar()
labentry = Entry(entrywindow, textvariable=lab).grid(row=5, column=1)
thrdisp = Label(entrywindow, text="Threshold").grid(row=6, column=0)
thr = StringVar()
threntry = Entry(entrywindow, textvariable=thr).grid(row=6, column=1)
confirm = Button(entrywindow, text="Confirm", command = makeEntry(name,date,dept,amt,amt2,lab,thr)).grid(row=7, column=0)
exi = Button(entrywindow, text="Exit", command = entrywindow.destroy).grid(row=7, column=1)
entryWindow.mainloop()
我认为我遇到了这个问题,例如,当您键入这行代码时:
labentry = Entry(entrywindow, textvariable=lab).grid(row=5, column=1)
labentry 值将返回为 None 所以尝试:
labentry = Entry(entrywindow, textvariable=lab);labentry.grid(row=5, column=1)
希望我帮助了你
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