I make project read RFID tag using python on raspberry pi and using reader RDM880.
My idea is to take the time in and time out to check with the staff to work on time or not.
I try to add card_ID, time_in, time_out to local mysql and remote mysql (IP: 192.168.137.1) using python.
I have the same table in remote and local mysql.
With my code, If server is not broken, it will add Card_ID, Time_in, Time_out to server and client. But If server broken, it error and stop.
I want when the server is broken, code still works and skip add data to server. It only adds to client.
Please help me. Thanks. (sorry, my english is not good)
Here is my code:
import serial
import time
import RPi.GPIO as GPIO
import MySQLdb
from datetime import datetime
from binascii import hexlify
serial=serial.Serial("/dev/ttyAMA0",
baudrate=9600,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.EIGHTBITS,
timeout=0.1)
db_local = MySQLdb.connect("localhost","root","root","luan_van")
db = MySQLdb.connect("192.168.137.1", "root_a","","luan_van")
ID_rong = 128187
chuoi= "\xAA\x00\x03\x25\x26\x00\x00\xBB"
def RFID(str):
serial.write(chuoi)
data = serial.readline()
tach_5 = data[5]
tach_6 = data[6]
hex_5 = hexlify(tach_5)
hex_6= hexlify(tach_6)
num_5 = int(hex_5,16)
num_6 = int(hex_6,16)
num_a = num_5 * 1000 + num_6
if(num_a != ID_rong):
tach_7 = data[7]
tach_8 = data[7]
hex_7 = hexlify(tach_7)
hex_8= hexlify(tach_8)
num_7 = int(hex_7,16)
num_8 = int(hex_8,16)
num = num_8 + num_7 * 1000 + num_6 * 1000000 + num_5 * 1000000000
else:
num = num_5 * 1000 + num_6
return num
def add_database():
with db:
cur = db.cursor()
cur.execure("INSERT INTO tt_control(Card_ID,Time_in) VALUES ('%d',NOW()) " %num)
return
def add_database_local():
with db_local:
cur = db_local.cursor()
cur.execure("INSERT INTO tt_control(Card_ID,Time_in) VALUES ('%d',NOW()) " %num)
return
def have_ID(int):
with db_local:
cur = db_local.cursor(MySQLdb.cursors.DictCursor)
cur.execute("SELECT * FROM tt_control WHERE Card_ID = '%d'" %num)
rows = cur.fetchall()
ID=""
for row in rows:
ID = row['Card_ID']
return ID
def add_time_out():
with db:
cur = db.cursor(MySQLdb.cursors.DictCursor)
cur.execute("UPDATE tt_control SET Time_out = NOW() WHERE Card_ID = '%d'" %num)
return
def add_time_out_local():
with db_local:
cur = db_local.cursor(MySQLdb.cursors.DictCursor)
cur.execute("UPDATE tt_control SET Time_out = NOW() WHERE Card_ID = '%d'" %num)
return
def add_OUT():
with db:
cur = db.cursor(MySQLdb.cursors.DictCursor)
cur.execute("UPDATE tt_control SET Card_ID = Card_ID + 1 WHERE Card_ID = '%d'" %num)
return
def add_OUT_local():
with db_local:
cur = db_local.cursor(MySQLdb.cursors.DictCursor)
cur.execute("UPDATE tt_control SET Card_ID = Card_ID + 1 WHERE Card_ID = '%d'" %num)
return
while 1:
num = RFID(chuoi)
time.sleep(1)
Have_ID =have_ID(num)
if(num != ID_rong):
if(Have_ID ==""):
add_database()
add_database_local()
else:
add_time_out()
add_time_out_local()
add_OUT()
add_OUT_local()