[Tkinter] Placing a Placeholder in the entry box

[Nymphalys08]

Hi,
My placeholder works now but the problem lies with calling it in the SQL statement.

Without the placeholder, my SQL is working fine because each of my entry boxes have (example: textvariable="user") but when I place it in the configuration of my entry box the placeholder will also disappear. How can I make my placeholder works and also the SQL statement?
Thank you

class EntryWithPlaceholder(tk.Entry):
    def __init__(self, master=None, placeholder="PLACEHOLDER", color='grey'):
        super().__init__(master)

        self.placeholder = placeholder
        self.placeholder_color = color
        self.default_fg_color = self['fg']

        self.bind("<FocusIn>", self.foc_in)
        self.bind("<FocusOut>", self.foc_out)

        self.put_placeholder()

    def put_placeholder(self):
        self.insert(0, self.placeholder)
        self['fg'] = self.placeholder_color

    def foc_in(self, *args):
        if self['fg'] == self.placeholder_color:
            self.delete('0', 'end')
            self['fg'] = self.default_fg_color

    def foc_out(self, *args):
        if not self.get():
            self.put_placeholder()

        self.user_input = EntryWithPlaceholder(root, 'USERNAME OR EMAIL')
        self.user_input.place(relx=0.18, rely=0.455, width=300, height=24)
        self.user_input.configure(font=("Corbel", 15))
        self.user_input.configure(borderwidth=0)
        self.user_input.configure(relief="flat")

    def login(self, Event=None):
        find_user = "SELECT * FROM employee WHERE ('username' :  u OR email_address = %s) and password = %s"
        cur.execute(find_user, [user.get(), user.get(), passwd.get()])
        results = cur.fetchall()
        if results:
            if results[0][10] == "Admin":
                messagebox.showinfo("Login Page", "The login is successful.")
                page1.user_input.delete(0, END)
                page1.pass_input.delete(0, END)

                root.withdraw()
                global adm
                global page2
                adm = Toplevel()
                page2 = Admin_Page(adm)
                # page2.time()
                adm.protocol("WM_DELETE_WINDOW", exitt)
                adm.mainloop()

            else:
                messagebox.showerror("Oops!!", "You are not an admin.")

        else:
            messagebox.showerror("Error", "Incorrect username or password.")
            page1.pass_input.delete(0, END)