如何使用python将树莓派连接到另一台PC的数据库

Question

I have a database in my current RPI. Since I'm only using 64GB SD card, I want to remove the database in my rpi and connect it to database of my laptop.

I've setup my LAN, I can now access the database through browser using my IP (192.168.1.14) but my code is not working.

Can you guys help me on how to connect my python code to another database.

here's my code to connect to database

import tkinter as tk
import pymysql
from tkinter import *
from tkinter import messagebox
from mfrc522 import SimpleMFRC522
import RPi.GPIO as GPIO

class Kiosk(tk.Frame):
   def __init__(self, master, *args, **kwargs):
       tk.Frame.__init__(self, master, *args, **kwargs)
       self.master = master
       master.title("Thesis")

       self.login_button = Button(master, text = "Login", bg= "white")
       self.login_button.pack()
       self.register_button = Button(master, text="Register", command=self.register)
       self.register_button.pack()

       self.close_button = Button(master, text="Close", command=master.destroy)
       self.close_button.pack()
       self.reader = SimpleMFRC522()

       self.master.configure(bg="white")    
       self.ws = self.master.winfo_screenwidth()
       self.hs = self.master.winfo_screenheight()

       self.master.geometry("{}x{}".format(self.ws, self.hs))

       self.db = pymysql.connect(host = "192.168.1.14", port = 3306, user = "root",passwd = "",db= "Thesis")
       self.cursor = self.db.cursor()
       self.QueryResident = "CREATE TABLE IF NOT EXISTS residence (FIRST_NAME varchar(255) not null, MIDDLE_NAME varchar(255) not null, LAST_NAME varchar(255) not null,SEX varchar(255) not null, BIRTH_DATE date, CIVIL_STATUS varchar(255) not null, PLACE_OF_BIRTH varchar(255) not null, RFID varchar(255))"
       self.cursor.execute(self.QueryResident)
       GPIO.cleanup()

   def registered(self, first_name, middle_name, last_name, sex, birth_day, civil_status, place_of_birth):
       self.get_first_name = self.first_name.get()
       self.get_middle_name = self.middle_name.get()
       self.get_last_name = self.last_name.get()
       self.get_sex = self.sex.get()
       self.get_birth_day = self.birth_day.get()
       self.get_civil_status = self.civil_status.get()
       self.get_place_of_birth = self.place_of_birth.get()


       if (self.get_first_name == "" or self.get_middle_name == "" or
           self.get_last_name == "" or self.get_sex == "" or self.get_birth_day == "" or
           self.get_civil_status == "" or self.get_place_of_birth == ""):
               messagebox.showerror("Error!","Please complete the required field", parent = self.master_register)
       else:
           self.master_register.destroy()
           self.RFID_registered()

   def RFID_registered(self):
       if (self.cursor.fetchone() is not None):
           messagebox.showerror("Notice!", "RFID card is already registered", parent = self.master_register)
       else:
           messagebox.showinfo("Success!","Your Registration is Successful", parent = self.master_register)
           self.cursor.execute ("INSERT INTO residence (FIRST_NAME, MIDDLE_NAME, LAST_NAME, SEX, BIRTH_DATE, CIVIL_STATUS, PLACE_OF_BIRTH) VALUES(%s, %s, %s, %s, %s, %s, %s)",(self.get_first_name,
                                                                                                                                                                                          self.get_middle_name,
                                                                                                                                                                                          self.get_last_name,
                                                                                                                                                                                          self.get_sex,
                                                                                                                                                                                          self.get_birth_day,
                                                                                                                                                                                          self.get_civil_status,
                                                                                                                                                                                          self.get_place_of_birth,
                                                                                                                                                                                          ))
           self.db.commit()
           self.master_register.destroy()
           GPIO.cleanup()

       GPIO.cleanup()


   def only_numeric_input(self, P):
       if P.isdigit() or P == "":
           return True
       return False

   def register(self):
       self.master_register = Toplevel()


       self.first_name = StringVar()
       self.middle_name = StringVar()
       self.last_name = StringVar()
       self.sex = StringVar()
       self.birth_day = StringVar()
       self.civil_status = StringVar()
       self.place_of_birth = StringVar()

       self.label_head = Label(self.master_register, text = "Please fill up all informations below",bg = "white")
       self.label_head.pack()

       self.label_first_name = Label(self.master_register, text = "First Name",bg = "white")
       self.label_first_name.pack()
       self.entry_first_name = Entry(self.master_register, textvariable = self.first_name,bg = "white")
       self.entry_first_name.pack()

       self.label_middle_name = Label(self.master_register, text = "Middle Name",bg = "white")
       self.label_middle_name.pack()
       self.entry_middle_name = Entry(self.master_register, textvariable = self.middle_name,bg = "white")
       self.entry_middle_name.pack()

       self.label_last_name = Label(self.master_register, text = "Last Name",bg = "white")
       self.label_last_name.pack()
       self.entry_last_name = Entry(self.master_register, textvariable = self.last_name,bg = "white")
       self.entry_last_name.pack()

       self.label_sex = Label(self.master_register, text = "Sex",bg = "white")
       self.label_sex.pack()
       self.radio_button_sex = Radiobutton(self.master_register, text = "Male", variable = self.sex, value = "Male",bg = "white")
       self.radio_button_sex.pack()
       self.radio_button_sex = Radiobutton(self.master_register, text = "Female", variable = self.sex, value = "Female",bg = "white")
       self.radio_button_sex.pack()

       self.label_birth_day = Label(self.master_register, text = "Birth Day",bg = "white")
       self.label_birth_day.pack()

       self.entry_birth_day = Entry(self.master_register, textvariable = self.birth_day,bg = "white")
       self.entry_birth_day.pack()
       self.callback = self.master_register.register(self.only_numeric_input)
       self.entry_birth_day.configure(validate = "key", validatecommand = (self.callback, "%P"))

       self.label_civil_status = Label(self.master_register, text = "Civil Status",bg = "white")
       self.label_civil_status.pack()
       self.entry_civil_status = Entry(self.master_register, textvariable = self.civil_status,bg = "white")
       self.entry_civil_status.pack()

       self.label_place_of_birth = Label(self.master_register, text = "Place of Birth",bg = "white")
       self.label_place_of_birth.pack()
       self.entry_place_of_birth = Entry(self.master_register, textvariable = self.place_of_birth,bg = "white")
       self.entry_place_of_birth.pack()



       self.button_submit = Button(self.master_register, text = "Submit",bg = "white", command = lambda: self.registered(self.first_name, self.middle_name,
                                                                                           self.last_name, self.sex, self.birth_day,
                                                                                           self.civil_status, self.place_of_birth))
       self.button_submit.pack()


if __name__== "__main__":
   root = Tk()
   main = Kiosk(root)
   root.mainloop()

Here's the error I've encountered.
`/usr/local/lib/python3.7/dist-packages/mfrc522/MFRC522.py:151: RuntimeWarning: This channel is already in use, continuing anyway.  Use GPIO.setwarnings(False) to disable warnings.
  GPIO.setup(pin_rst, GPIO.OUT)
Traceback (most recent call last):
  File "/home/pi/stack.py", line 145, in <module>
    main = Kiosk(root)
  File "/home/pi/stack.py", line 29, in __init__
    self.db = pymysql.connect(host = "192.168.1.14", port = 3306, user = "root",passwd = "",db= "Thesis")
  File "/usr/local/lib/python3.7/dist-packages/pymysql/__init__.py", line 94, in Connect
    return Connection(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/pymysql/connections.py", line 325, in __init__
    self.connect()
  File "/usr/local/lib/python3.7/dist-packages/pymysql/connections.py", line 598, in connect
    self._get_server_information()
  File "/usr/local/lib/python3.7/dist-packages/pymysql/connections.py", line 975, in _get_server_information
    packet = self._read_packet()
  File "/usr/local/lib/python3.7/dist-packages/pymysql/connections.py", line 671, in _read_packet
    % (packet_number, self._next_seq_id))
pymysql.err.InternalError: Packet sequence number wrong - got 1 expected 0

Hope you guys can help me, Thank you so much!

Answer 1

I am not exactly sure what's wrong with your program. However, you can give the below program a shot!

import pymysql as db
try:
    con=db.connect("Enter the host here ","user_name","pass_word","db_name")
except Exception as e:
    print(e)
con.autocommit(True)
with con:
        cur=con.cursor()
        cur.execute("DROP table if exists Test_Table")
        cur.execute("CREATE TABLE Test_Table(id INT PRIMARY KEY AUTO_INCREMENT, name varchar(20),Time timestamp,age float(20)")

Change the column names accordingly for your requirement!