Thanks, I used the first method. Follow up question: How do I get the new primary key after running `session.commit()`?
On Tuesday, December 19, 2017 at 11:29:34 AM UTC-5, Mike Bayer wrote: > > On Tue, Dec 19, 2017 at 3:02 AM, Tom Tanner > <dontsende...@gmail.com <javascript:>> wrote: > > I'm using SQLAlchemy with the Python library Flask. > > > > How do I query an object from a database, make a copy of it, and save > that > > copy to the database? > > > > Example of querying an object. > > someObj = db.session.query(SomeDataTable).filter_by(id=someID).first() > > > > > > I want to save a copy of `someObj` to the table. How do I do this? > > OK so "copy" we will take to mean, a new row in the table, with all > the same data, *except* for the primary key, as that has to be > different. > > The kind of primary key your object has is important here. Let's say > it's a single integer "id" column that is generated from the database. > You'd do this: > > from sqlalchemy.orm import make_transient > make_transient(someObj) # someObj is no longer in the session > del someObj.id # assume this is the primary key > session.add(someObj) > session.commit() > > > if OTOH your object has a natural primary key (one that you set in > python), then instead of "del someObj.id" you would assign a new > primary key value to be used. > > > that's it ! > > > > All you do is this: > > > > > > > > -- > > 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+...@googlegroups.com <javascript:>. > > To post to this group, send email to sqlal...@googlegroups.com > <javascript:>. > > Visit this group at https://groups.google.com/group/sqlalchemy. > > For more options, visit https://groups.google.com/d/optout. > -- 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.
