[top] / ZODB / Blobs / interfaces / IBlob
A BLOB supports efficient handling of large data within ZODB.
There are no attributes or fields specified.
consumeFile(filename)
Will replace the current data of the blob with the file given under filename.
This method uses link-like semantics internally and has the requirement that the file that is to be consumed lives on the same volume (or mount/share) as the blob directory.
The blob must not be opened for reading or writing when consuming a file.
open(mode)
Returns a file(-like) object for handling the blob data.
mode: Mode to open the file with. Possible values: r,w,r+,a
openDetached(class_=<type 'file'>)
Returns a file(-like) object in read mode that can be used outside of transaction boundaries.
The file handle returned by this method is read-only and at the beginning of the file.
The handle is not attached to the blob and can be used outside of a transaction.
Optionally the class that should be used to open the file can be specified. This can be used to e.g. use Zope's FileStreamIterator.
There are no specific adapters registered for this interface.
There are no extended adapters registered for this interface.
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