mike bayer <mike...@zzzcomputing.com> writes: > On 02/14/2017 11:02 AM, Manuel wrote: >> Thanks, I'm still in the early stages of this project and any comments >> are highly appreciated. What I'm trying to actually accomplish is to >> build some complex queries to be executed against an Odoo [1] DB. Odoo >> has it's own ORM, but it lacks some features I like the most about >> SQLAlchemy: >> >> - A clear API to define custom mappings. >> >> - A clear low-level API to create SQL-like sentences (even coupled to >> PostgreSQL) that would be a highly appreciated. >> >> See [2] for a hard to maintain and test method. >> >> I'd keep Odoo's models for the description of the DB layer. But I would >> like more flexibility to represent the Python-side of some models. >> >> Using the 'mock' strategy I thought I could run the SQL myself like and >> funnel the SQL execution back to Odoo's cursors. Something like:: > > > if Odoo gives you a "cursor", that implies you'd produce a dialect for Odoo. > Dialects can be produced for anything, while a pep249 DBAPI is the easiest, it > is possible to create limited dialects against anything else. > > The most exotic example is my proof of concept dialect against Pandas > dataframes: https://bitbucket.org/zzzeek/calchipan/ . It doesn't use SQL at > all, the SQL compiler produces objects that work on Pandas objects. > > >> >> def execute(self, sql, *params, **other): >> # self.obj.cr is wrapper around pyscopg2's cursor >> self.obj.cr.execute(sql, params) # How to merge params and other? >> return do_something_with(self.obj.cr.fetchall()) >> >> If the 'executor' returns a ResultProxy-like, the 'mock' strategy would >> work? If it should work, then the problem would be to create a >> ResultProxy compliant object that bridges Odoo's world to SA's. > > "mock" is really a very quick one-off that isn't going to do much outside of > grabbing simple DDL. If you're looking to create full front-to-back > SQLAlchemy round trips over Odoo, your best bet is the dialect, buliding on > top of a pep-249-style DBAPI implementation against whatever Odoo provides. >
I've cloned calchipan, and also looking at the implementation of the standard dialects. Let's see if something comes up. Thanks and best regards, Manuel. -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
