Python中出生日期的格式检查

Question

我目前正在开发一个数据库应用程序，用户在其中填写客户表单，然后将数据添加到SQLite3表中。我正在尝试将验证添加到代码中，并使其正常工作，但它将记录添加到包含无效数据的表中。如果数据无效，有没有办法停止代码的执行？请参见下面的代码和界面截图：

    def validate(self):
        dateofbirth = self.DOBEntry.get()
        try:
            datetime.datetime.strptime(dateofbirth, '%D/%M/%Y')
        except ValueError:
            tkinter.messagebox.showerror("Error","Please enter the date of birth in the correct format DD-MM-YYYY")



    def AddCustomer(self):
        customerid = int(self.CustomerEntry.get())
        branchid = self.BranchEntry.get()
        name = self.NameEntry.get()
        surname = self.SurnameEntry.get()
        dateofbirth = self.DOBEntry.get()
        town = self.TownEntry.get()
        postcode = self.PostcodeEntry.get()
        email = self.EmailEntry.get()
        telephone = self.TelephoneEntry.get()
        medical = self.MedicalEntry.get()
        try:
            self.validate()
            with sqlite3.connect("LeeOpt.db") as db:
                cursor = db.cursor()
                add_customer = ('''INSERT INTO Customer(CustomerID, BranchID, Name, Surname, DateOfBirth, Town, Postcode, EmailAddress, TelephoneNo, MedicalConditions)
                VALUES (?,?,?,?,?,?,?,?,?,?)''')
                cursor.execute(add_customer, [(customerid),(branchid),(name),(surname),(dateofbirth),(town),(postcode),(email),(telephone),(medical)])
                tkinter.messagebox.showinfo("Notification","Customer added successfully")
                self.ClearEntries()
        except (sqlite3.IntegrityError): 
            tkinter.messagebox.showerror("Error","This CustomerID is already taken, please try another.")
            self.ClearID()

Answer 1

试着这样做：

def validate(self):
    dateofbirth = self.DOBEntry.get()
    try:
        datetime.datetime.strptime(dateofbirth, '%D/%M/%Y')
        return True # returns a boolean True
    except ValueError: 
        tkinter.messagebox.showerror("Error","Please enter the date of birth in the correct format DD-MM-YYYY")
        return False

def AddCustomer(self):
    # Same code

    if self.validate(): # If true is returned, then...also same as if self.validate()==True
        try:
            with sqlite3.connect("LeeOpt.db") as db:
                cursor = db.cursor()
                add_customer = ('''INSERT INTO Customer(CustomerID, BranchID, Name, Surname, DateOfBirth, Town, Postcode, EmailAddress, TelephoneNo, MedicalConditions)
                VALUES (?,?,?,?,?,?,?,?,?,?)''')
                cursor.execute(add_customer, (customerid,branchid,name,surname,dateofbirth,town,postcode,email,telephone,medical))
                tkinter.messagebox.showinfo("Notification","Customer added successfully")
                self.ClearEntries()
        except (sqlite3.IntegrityError): 
            tkinter.messagebox.showerror("Error","This CustomerID is already taken, please try another.")
            self.ClearID()

这里True将仅在行中没有错误时返回，否则False将返回，因此基于此，您在AddCustomer()内创建一个if。我还将execute的参数更改为tuple，而不是按惯例更改为list