On Oct 29, 2010, at 6:12 AM, Dan @ Austria wrote: > Hi, > > i have a question to database/design specialist. How can (should!) i > implement a stock management system in sql-alchemy and python? I get > the following data from another system via files > > - movements: bills from a scanner at a cash deck > - movements: from goods-receipt > > Of course i have also master data on an per article basis. > > What i want do is keep charge of the stock available in our warehouse. > Should i built a warehouse table with > [ article / amount of article available ] > > and update the articles with an update statement like UPDATE > warehouse_table SET amount = amount - (bill amount) where article = > bill_article ? Would that be a good solution? > > Is there any literature or reference implementations around? Any hint > is much apreciated. Although i have written a couple of database > applications, i never had the probleme to change a field (amount field > per article) so often. I guess there is a lot of data comming in ...
I have a book that I have that gives data models, including those for inventory management is "The Data Model Resource Book, Revised Edition, Volume 1" by Len Silverston. The models presented are quite complex though and intended to be refined by the designer by removing complexity that isn't needed for a given application. One beef I have with the book is that even though the book is priced higher than many computer books (about $60 US) at Amazon and comes with a CD-ROM, the schema for the data which is printed in the book is only available from the CD once you purchase a license (about $200, if I recall) to unlock it. The Revised Edition is copyright 2001. More information is at http://silverston.wiley.com/ While you can use SQL statements directly with SQLAlchemy, you should consider using SA methods. For an example of what you suggest with your SQL look for the Correlated Updates section in the SQL Expression Language Tutorial in the SA docs. Mark -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
