Question

ive创建了一个数据库，用于存储用户已添加到gui中的信息。然后，通过一个简单的函数返回该信息，以便在另一个类中使用该类，在该类中，我收到错误'All_Contents_Page' object has no attribute 'c'“ All_Contents_Page”是类名。

class AddEmployee:
    def __init__(self, master):
        self.master = master
        self.master.geometry("400x500")
        self.master.title("Add Employee")

        self.AddEmployee_ID = tk.Entry(self.master)
        self.AddEmployee_FirstName = tk.Entry(self.master)
        self.AddEmployee_Surname = tk.Entry(self.master)
        self.AddEmployee_DOB = tk.Entry(self.master)
        self.AddEmployee_Age = tk.Entry(self.master)
        self.AddEmployee_Gender = tk.Entry(self.master)

        self.AddEmployee_ID.grid(row = 1, column = 1)
        self.AddEmployee_FirstName.grid(row = 2, column = 1)
        self.AddEmployee_Surname.grid(row = 3, column = 1)
        self.AddEmployee_DOB.grid(row = 4, column = 1)
        self.AddEmployee_Age.grid(row = 5, column = 1)
        self.AddEmployee_Gender.grid(row = 6, column = 1)


        self.AddEmployee_ID_Label = tk.Label(self.master, text = "ID").grid(row = 1, column = 2 )
        self.AddEmployee_FirstName_Label = tk.Label(self.master, text = "First Name").grid(row = 2, column = 2 )
        self.AddEmployee_Surname_Label = tk.Label(self.master, text = "Surname").grid(row = 3, column = 2 )
        self.AddEmployee_DOB_Label = tk.Label(self.master, text = "Date of Birth").grid(row = 4, column = 2 )
        self.AddEmployee_Age_Label = tk.Label(self.master, text = "Age").grid(row = 5, column = 2 )
        self.AddEmployee_Gender_Label = tk.Label(self.master, text = "Gender").grid(row = 5, column = 2 )

        self.AddEmployee_Add_Button = tk.Button(self.master, text = "Add", command = self.AddEmployee_CheckInfo_Confirm).grid(row = 3, column = 3)

    def AddEmployee_CheckInfo_Confirm(self):
        if self.AddEmployee_FirstName.get() and self.AddEmployee_ID.get() and self.AddEmployee_Age.get() and self.AddEmployee_DOB.get() and self.AddEmployee_Gender.get() and self.AddEmployee_Surname != "":
            if self.AddEmployee_FirstName.get() and self.AddEmployee_Surname.get():
                print("ayyyy lmao")
                self.AddEmployee_DatabaseRun()
                self.AddEmployee_AddUserData()
                self.AddEmployee_ReturnAllData()
            else:
                print("didnt work")
        else:
            print("Didnt work")

def AddEmployee_DatabaseRun():
        self.conn = sqlite3.connect(':memory:')
        self.c = self.conn.cursor()

        self.c.execute("""CREATE TABLE Employees (
                        ID Integer,
                        FirstName text,
                        Surname text,
                        DOB integer,
                        Age integer,
                        Gender text
                        )""") #Creation of Database

        self.conn.commit()

    def AddEmployee_ReturnAllData(self):
        self.c.execute("SELECT * FROM Employees")
        return self.c.fetchall()
        self.conn.commit() #Returned data


    def AddEmployee_AddUserData(self):
        self.c.execute("INSERT INTO Employees VALUES (:ID, :FirstName, :Surname, :DOB, :Age, :Gender)",
                     {'ID: ': self.AddEmployee_ID.get(), 'First Name: ': self.AddEmployee_FirstName.get() , 'Surname: ': self.AddEmployee_Surname.get() ,
                     'DOB: ': self.AddEmployee_DOB.get() , 'Age: ': self.AddEmployee_Age.get() , 'Gender: ': self.AddEmployee_Gender.get()})

        self.conn.commit()

这是我尝试运行该函数以检索数据的类：

class All_Contents_Page:
    def __init__(self, master):
        self.master = master
        self.master.geometry("1000x600")
        self.master.title("Company Database")

        self.All_Contents_Page_ListBox = tk.Listbox(self.master,width = 100, height = 20 ).grid(row = 1, column = 2)
        self.All_Contents_Page_AddEmployeeButton = tk.Button(self.master, text = "Add Employee", command = self.gotoAddEmployee).grid(row = 2, column = 1)

        self.OtherClassMethod = 'AddEmployee_ReturnAllData'
        self.ReturnedData = getattr(AddEmployee, self.OtherClassMethod)

        for data in enumerate(self.ReturnedData(self)):
            self.All_Contents_Page_ListBox.insert(1, data)

对于为什么会出现此错误，我感到困惑，这是我尝试从类中调用函数的方式吗？

我决定不创建类的实例来获取功能，因为我将破坏正在创建实例的GUI。

解决这个问题最好是什么？

Answer 1

getattr(AddEmployee, self.OtherClassMethod)(self)在class All_Contents_Page中可能是错误的，它不是AddEmployee的子类。 AddEmployee.AddEmployee_ReturnAllData可能正在尝试访问self.c实例上的游标All_Contents_Page，该实例在初始化期间没有收到c成员。

目前尚不清楚您的意图，因此很难提出解决方案。但这可能是您描述的错误的原因。

Answer 2

定义c属性的唯一位置是AddEmployee_DatabaseRun。但是，您不仅不会调用该方法，而且甚至不会创建AddEmployee实例以使其首先存在。传递给self的{{1}}是AddEmployee_ReturnAllData的当前实例-这是一个完全不同的类，也没有All_Contents_Page属性。

尚不清楚您为什么期望c存在，因为它仅在您不调用的一种方法中定义。也许您可以只在调用的方法中使用本地定义的连接？但实际上，您根本不应该编写这样的代码。

类没有来自返回数据的属性错误

2 个答案: