saving and retrieving various (doc, xls, pdf, etc) files attached to DB row
D7; Sybase ASA 9.0; BDE/ODBC I have a client who wants to attach various document types to rows in the DB. Do I attempt to store them as Blob's or save the document location and open it with its native program? Any suggestions of the best technique, alternate technique or methodology using Delphi 7 or Delphi 2007? Thanks -- Bill Skelton Landmark Data Systems, Inc. Two Old River Place, Suite L Jackson, MS 39202-3435 601-362-0303 Edited by: Bill Skelton on Aug 19, 2008 3:39 PM
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Bill
8/19/2008 10:40:16 PM
embarcadero.delphi.general
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Bill Skelton schrieb: > D7; Sybase ASA 9.0; BDE/ODBC > > I have a client who wants to attach various document types to rows in the > DB. Do I attempt to store them as Blob's or save the document location and > open it with its native program? I think, it depends on. What should your client do with the documents? What are the documents for a type? Are they only for the application or are they also for other applications? Is your program a single-user application or a multi-user and network-application? Your question isn't answered simply ;) -- Andreas Richter URLs: http://www.anrichter.net | http://www.oszine.de GPG-KeyID: 0x7BA12DD9 Fingerprint: D2E9 202B F4F0 EB16 25DE 5FF7 0CF2 3C57 7BA1 2DD9
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Andreas
8/20/2008 7:13:17 AM
> {quote:title=Bill Skelton wrote:}{quote}
> D7; Sybase ASA 9.0; BDE/ODBC
>
> I have a client who wants to attach various document types to rows in the
> DB. Do I attempt to store them as Blob's or save the document location and
> open it with its native program?
Bill,
I'd suggest just saving the fully qualified pathname in the DB, and the files on the disk itself.
In order to do anything with them, you'll most likely have to use it's native program anyway, and therefore would have to create the disk file at some point. Why waste the extra space in the DB when it's pretty much useless there?
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Ken
8/20/2008 8:22:29 PM
Bill Skelton wrote: > D7; Sybase ASA 9.0; BDE/ODBC > > I have a client who wants to attach various document types to rows in > the DB. Do I attempt to store them as Blob's or save the document > location and open it with its native program? > > Any suggestions of the best technique, alternate technique or > methodology using Delphi 7 or Delphi 2007? There are advantanges and drawbacks to each method. Keeping them in the database guarantees referential integrity and remote users can access the files using the existing database connection. Your entire database can be backed up to a single file. The downside being slow, bulky database backups & possibly poor retrieval performance. Opening a file requires you to create a local temp copy for use with ShellExecute. Keeping them separate from the database makes for easy backups and fast access, but the referential integrity depends solely on the client app and remote users require a separate method of getting to them, like an http or ftp server. LAN users can open the files in-place, while remote users will require retrieval of a copy from the server. If you do decide to keep them separate from the database, just store the filenames and have the storage folder some kind of global preference (e.g. "\\server\share"). That way, should you need to move them to a bigger drive or faster server someday, you only have to change one setting rather than thousands of stored pathnames. Also, create subdirectories for the entities the files belong to because too many files in a single directory can cause filesystem performance problems. In summary, "it depends". :) -- Ray Marron
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Ray
8/20/2008 9:00:20 PM
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