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我有一个接受 zip 文件的上传表单，并有一个解压缩它并从中获取每个文件的方法。从它的 md5 哈希中创建一个唯一的 id 并将它们存储在字典中；

dict[uid] = imagebinary

并返回它以便表单可以将它们存储到 ZODB 中。我不能像这样存储图像，因为这个错误会吐出来；

    2013-01-31 08:59:59,061 ERROR [waitress][Dummy-5] Exception when serving /
Traceback (most recent call last):
  File "/home/maverick/inigo/sources/devenv/lib/python2.7/site-packages/waitress-0.8.2-py2.7.egg/waitress/channel.py", line 329, in service
    task.service()
  File "/home/maverick/inigo/sources/devenv/lib/python2.7/site-packages/waitress-0.8.2-py2.7.egg/waitress/task.py", line 173, in service
    self.execute()
  File "/home/maverick/inigo/sources/devenv/lib/python2.7/site-packages/waitress-0.8.2-py2.7.egg/waitress/task.py", line 380, in execute
    app_iter = self.channel.server.application(env, start_response)
  File "/home/maverick/.buildout/eggs/pyramid-1.4-py2.7.egg/pyramid/router.py", line 251, in __call__
    response = self.invoke_subrequest(request, use_tweens=True)
  File "/home/maverick/.buildout/eggs/pyramid-1.4-py2.7.egg/pyramid/router.py", line 227, in invoke_subrequest
    response = handle_request(request)
  File "/home/maverick/inigo/sources/devenv/lib/python2.7/site-packages/pyramid_debugtoolbar-1.0.4-py2.7.egg/pyramid_debugtoolbar/toolbar.py", line 133, in toolbar_tween
    body = tb.render_full(request).encode('utf-8', 'replace')
  File "/home/maverick/inigo/sources/devenv/lib/python2.7/site-packages/pyramid_debugtoolbar-1.0.4-py2.7.egg/pyramid_debugtoolbar/tbtools.py", line 240, in render_full
    summary = self.render_summary(include_title=False, request=request)
  File "/home/maverick/inigo/sources/devenv/lib/python2.7/site-packages/pyramid_debugtoolbar-1.0.4-py2.7.egg/pyramid_debugtoolbar/tbtools.py", line 229, in render_summary
    'description':  description_wrapper % escape(self.exception),
UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 114: ordinal not in range(128)

那么，我该怎么做呢？我几乎坚持这一点。

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1 回答 1

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您看到的错误与 ZODB 中的图像存储无关。

要存储更大的数据，您确实希望使用 ZODB Blob，而不是将图像数据直接放在属性中。Blobs 单独存储在磁盘上，不会刷新 ZODB 缓存，并且可以在再次访问时流回客户端。

要创建和存储 a Blob，请使用：

from ZODB.blob import Blob

uid = Blob(imagebinary.read())

像这样创建后，您可以稍后将uid其用作文件；您需要先以读取或写入模式打开它。例如，要从视图返回 blob 的内容，请使用：

from pyramid.response import Response

def serveimage(request):
    # retrieve uid from somewhere
    resp = Response(content_type='image/jpeg')
    resp.app_iter = uid.open('r')  # open for reading
    return resp

Blob 绑定到事务，如果事务回滚，对它们的更改会自动丢弃。

于 2013-02-01T11:21:57.627 回答