删除所有blobstore数据的最简单方法是什么？

Question

从blobstore中删除所有blob的最佳方法是什么？我正在使用Python.

我有很多blob,我想删除它们.我目前正在做以下事情:

class deleteBlobs(webapp.RequestHandler): 
    def get(self): 
        all = blobstore.BlobInfo.all(); 
        more = (all.count()>0) 
        blobstore.delete(all); 
        if more: 
            taskqueue.add(url='/deleteBlobs',method='GET'); 

这似乎是使用大量的CPU和(据我所知)没有任何用处.

Answer 1

我用这种方法:

import datetime
import logging
import re
import urllib

from google.appengine.ext import blobstore
from google.appengine.ext import db
from google.appengine.ext import webapp

from google.appengine.ext.webapp import blobstore_handlers
from google.appengine.ext.webapp import util
from google.appengine.ext.webapp import template

from google.appengine.api import taskqueue
from google.appengine.api import users


class IndexHandler(webapp.RequestHandler):
    def get(self):
        self.response.headers['Content-Type'] = 'text/plain'
        self.response.out.write('Hello. Blobstore is being purged.\n\n')
        try:
            query = blobstore.BlobInfo.all()

            index = 0

            to_delete = []
            blobs = query.fetch(400)
            if len(blobs) > 0:
                for blob in blobs:
                    blob.delete()
                    index += 1

            hour = datetime.datetime.now().time().hour
            minute = datetime.datetime.now().time().minute
            second = datetime.datetime.now().time().second
            self.response.out.write(str(index) + ' items deleted at ' + str(hour) + ':' + str(minute) + ':' + str(second))
            if index == 400:
                self.redirect("/purge")

        except Exception, e:
            self.response.out.write('Error is: ' + repr(e) + '\n')
            pass

APP = webapp.WSGIApplication(
    [
        ('/purge', IndexHandler),
    ],
    debug=True)

def main():
    util.run_wsgi_app(APP)


if __name__ == '__main__':
    main()

我的经验是,一次超过400个blob会失败,所以我让它每400次重新加载.我试过blobstore.delete(query.fetch(400)),但我认为现在有一个bug.什么都没发生,什么都没删除.