ems/scr/swich.py

'''
Created on 15.11.2013

@author: Philipp Rauch
@version: 0.01
'''

import MySQLdb
import threading
import Queue
from CANFilter import CANFilter

MYSQL   = 0
CSV     = 1
XML     = 2
JSON    = 3

class Swich(threading.Thread):

    def __init__(self, source = MYSQL):
        threading.Thread.__init__(self)
        self.source = source

    def __del__(self):
        if self.source == MYSQL:
            self.CAN.join()

    def initialisiere(self):
        if self.source == MYSQL:
            self.CAN = CANFilter()
            self.CAN.start()

            self.connection = MySQLdb.connect("url", "user", "password", "database_name")
            self.cursor = self.connection.cursor()
            self.queue = Queue.Queue()
            return self.queue, self.CAN

        elif self.source == CSV:
            pass

        elif self.source == XML:
            pass

        elif self.source == JSON:
            pass

        else:
            return
        
    def run(self):
        while True:
            sql = 'SELECT * FROM %s ORDER BY timestamp DESC LIMIT 1'
            item = Swich.queue.get(block = True)    #item is a string which names the table that will be returned (newest values)

            print self.cursor.execute(sql % item)

    def setQueue(self, item):
        self.queue.put(item)