使用计时器时更新数据库

时间：2014-06-22 12:45:01

标签： python python-2.7 xbmc

我正在使用python脚本在使用time.sleep函数的同时在sqlite3数据库中写入数据。我在使用time.sleep函数的同时编写数据库时遇到了麻烦。

我可以创建数据库表而不会有任何问题，但是当我使用time.sleep函数时，它将停止将数据写入数据库。

当我使用此代码时：

import time
import threading

#DOWNLOAD THE XML SOURCE HERE
url = ADDON.getSetting('allchannel.url')
req = urllib2.Request(url)
response = urllib2.urlopen(req)
data = response.read()
response.close()
profilePath = xbmc.translatePath(os.path.join('special://userdata/addon_data/script.tvguide',''))
self.getControl(4202).setLabel("1%")


if os.path.exists(profilePath):
   profilePath = profilePath + 'source.db'
   con = database.connect(profilePath)
   cur = con.cursor()
   cur.execute('CREATE TABLE programs(channel TEXT, title TEXT, start_date TIMESTAMP, stop_date TIMESTAMP, description TEXT)')
   con.commit()
   con.close
   tv_elem = ElementTree.parse(StringIO.StringIO(data)).getroot()
   profilePath = xbmc.translatePath(os.path.join('special://userdata/addon_data/script.tvguide', ''))
   profilePath = profilePath + 'source.db'
   con = sqlite3.connect(profilePath)
   cur = con.cursor()
   channels = OrderedDict()

   # Get the loaded data
   for channel in tv_elem.findall('channel'):
       channel_name = channel.find('display-name').text
       for program in channel.findall('programme'):
           title = program.find('title').text
           start_time = program.get("start")
           stop_time = program.get("stop")
           cur.execute("INSERT INTO programs(channel, title, start_date, stop_date)" + " VALUES(?, ?, ?, ?)", [channel_name, title, start_time, stop_time])
           con.commit()
           con.close

           time.sleep(2)
           #Stop the timer and set the timer again for 2 seconds
           self.getControl(4202).setLabel("8%")

           time.sleep(2)
           #Stop the timer and set the timer again for another 2 seconds
           self.getControl(4202).setLabel("16%")

           time.sleep(2)
           #Stop the timer and set the timer again for another 2 seconds
           self.getControl(4202).setLabel("24%")

因此，当我在不使用time.sleep函数的情况下尝试此操作时：

   # Get the loaded data
   for channel in tv_elem.findall('channel'):
       channel_name = channel.find('display-name').text
       for program in channel.findall('programme'):
           title = program.find('title').text
           start_time = program.get("start")
           stop_time = program.get("stop")
           cur.execute("INSERT INTO programs(channel, title, start_date, stop_date)" + " VALUES(?, ?, ?, ?)", [channel_name, title, start_time, stop_time])
           con.commit()
           con.close

如果我在没有time.sleep函数的情况下使用它，它将允许我将数据写入数据库。我想使用time.sleep函数或计时器，因为我想在每2秒钟更新setLabel函数中的字符串，同时我将数据写入数据库。我尝试使用while循环，它将冻结我正在运行的应用程序。

您能否告诉我如何在使用time.sleep或计时器功能的同时将数据写入数据库？

编辑：运行线程时我得到的打印太多了：

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2 个答案:

答案 0 :(得分：1)

我不熟悉你选择进行任务的方式，基本上睡觉应用程序听起来不好主意，你可能想找到一个更好的方法。

但是，如果您想要运行2个不同的操作，则需要使用threading。一个小例子

def function_1():
    for i in range(5):
        print "1111"
        time.sleep(1)

def function_2():
    for i in range(5):
        print "2222"
        time.sleep(1)

t1 = threading.Thread(target=function_1)
t2 = threading.Thread(target=function_2)

t1.start()
t2.start()

如果你被称为没有穿线的2个功能，那么你可以进出所有'111'，然后是所有'222'。

使用线程时我得到了这个：

1111
2222
2222
1111
1111
2222
2222
1111
2222
1111

因为它发生了并行。 希望它足够清楚。

答案 1 :(得分：0)

time.sleep()是一个阻塞函数，因此它会停止处理 - 您需要将数据库写入移动到单独的线程，请参阅线程或子进程的手册，或者需要从计时器更新字符串，也在手册中。

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