tables can be altered additively, sure
from sqlalchemy import *
from sqlalchemy.schema import CreateTable
m = MetaData()
# table w/ no PK
t = Table(
"nopk", m,
Column('q', Integer),
Column('p', Integer)
)
# add a column w/ pk=True
t.append_column(Column('id', Integer, primary_key=True))
print(CreateTable(t))
# table w/ no PK
t2 = Table(
"nopk_2", m,
Column('q', Integer),
Column('p', Integer)
)
# add a new pk constraint, append_constraint knows how to replace
# an empty pk constraint w/ a non-empty one
t2.append_constraint(PrimaryKeyConstraint("q", "p"))
print(CreateTable(t2))
On Mon, Jul 2, 2018 at 10:09 AM, Javier Collado Jiménez
<collado...@gmail.com> wrote:
> Hello!
> Is there a way to redefine a table in metadata?
> I'm trying to define a table without pk to create this way in the database,
> and then trying to add the pk to the definition to use it.
> But I'm always getting this error
> sqlalchemy.exc.ArgumentError: Column object 'column' already assigned to
> Table 'table'
> I'm using extend_existing=True but it doesn't work either.
> Thank you in advance!
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
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--
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.
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