[sqlalchemy] Re: remove duplicates - DISTINCT constraint
On Apr 3, 2:41 am, Disrupt07 [EMAIL PROTECTED] wrote: It would be nice if SQLAlchemy has something to constrain distinct values on save() or flush(). You might be interested in this: http://www.sqlalchemy.org/trac/wiki/UsageRecipes/UniqueObject --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: remove duplicates - DISTINCT constraint
Disrupt07 ha scritto: I need to populate a table with author names for example the table name is author and it has a field authorname of type text. authorname has the following values: W. Shakespear J. Smith W. Shakespear R. Williams K. Winslet ... and so on. Then I want SQLAlchemy to remove the duplicates, so that W. Shakespear will be saved only once. How can I achieve this using SQLAlchemy? Thanks Primary Key or unique constraint do this... anyway if these names are stored in a list or something similar a sequence... firt of all put it in a type 'set' ...so automatically your problem is gone.. In [21]: set( [ 'W. Shakespear', 'J. Smith', 'R. William', 'W. Shakespear', 'J. Smith']) Out[21]: set(['W. Shakespear', 'R. William', 'J. Smith']) Glauco -- ++ Glauco Uri - Programmatore glauco(at)allevatori.com Sfera Carta Software® [EMAIL PROTECTED] Via Bazzanese,69 Casalecchio di Reno(BO) - Tel. 051591054 ++ --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: remove duplicates - DISTINCT constraint
Disrupt07 ha scritto: Thanks. But what do you mean by a type 'set' ? Is this a functionality of SQLAlchemy or of a list or some programming language? What's your data sources ? a python list? a text file? another DB? You can do a sequence of insert into with a unique contraint over that field so duplicate records will not be stored... the set otherwise is only usable if you have a list (from a turbo Gear Form form for example ) a = Authors() my_authors= [ 'W. Shakespear', 'J. Smith', 'R. William', 'W. Shakespear', 'J. Smith'] for x in set( my_authors ) a.new( x ) Please explain how to do it in SQLAlchemy because I want to populate the table initially with all of the data, then I want SQLAlchemy to save only unique distinct values. Glauco -- ++ Glauco Uri - Programmatore glauco(at)allevatori.com Sfera Carta Software® [EMAIL PROTECTED] Via Bazzanese,69 Casalecchio di Reno(BO) - Tel. 051591054 ++ --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
