Thanks for the (very) fast response helix84. I actually did look at ItemUpdate. This still requires that you delete one bitstream and add another. The delete option requires a bitstream ID, which I have no way of knowing by iterating the filesystem.
Unless the internal_id in the bitstream table is unique and corresponds to the filename as stored in assetstore, which it now looks likely to me. If that is true, then I should be able to use ItemUpdate by using the filename that I am busy with to do a lookup of the bistream_id in the bitstream table. The question then becomes, am I correct in assuming that the bitstream.internal_id field is the actual filename? If I am to use your other suggestion and calculate my own MD5 checksum and insert it into the database, I will then also need to update the bitstream.size_bytes field. Both of these methods sound likely to work, but I think that the ItemUpdate is safer. I will test both and let you know. On 11/01/2012 06:38 PM, helix84 wrote: > You don't have to make it so complicated, DSpace data structures are > very sane as opposed to some other systems. After you replaced the > files in the assetstore, calculate a new MD5 checksum for them and > store it to the bitstream table. Notice that bitstream file name in > asset store is not equal to its checksum. The checksum is in the > bitstream.checksum columns and is indeed MD5. > > Don't forget to run index-update after you change the values. Running > the checksum checker is a matter of course, you know that. > > Just to comment on the problem with the mappings: > you probably used ItemImport with the replace parameter: > https://wiki.duraspace.org/display/DSDOC3x/Importing+and+Exporting+Items+via+Simple+Archive+Format#ImportingandExportingItemsviaSimpleArchiveFormat-ReplacingItemsinCollection > > That one deletes the item and submits a new one. using ItemUpdate > instead might work as expected: > https://wiki.duraspace.org/display/DSDOC3x/Updating+Items+via+Simple+Archive+Format > > Regards, > ~~helix84 > ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct _______________________________________________ DSpace-tech mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dspace-tech
