On Thu, Sep 6, 2018 at 3:50 AM, Yingchen Zhang <cevin.che...@gmail.com> wrote:
> so, alembic not support `default` ( pgsql create columnn ) ?
it does. use server_default. "default" in SQLAlchemy refers to a
Python-side default.
>
> 在 2018年9月6日星期四 UTC+8上午12:24:54，Mike Bayer写道：
>>
>> On Wed, Sep 5, 2018 at 11:51 AM, Yingchen Zhang <cevin....@gmail.com>
>> wrote:
>> > db.Column('text_column', db.VARCHAR(20), default='test_text',
>> > server_default='test_text', nullable=True)
>> >
>> > but, generated code like:
>> >
>> > sa.Column('text_column', sa.VARCHAR(20), nullable=True),
>>
>> I assume you are using Alembic autogeneration. The Python-side
>> default "test_text" is not needed in an alembic autogeneration. The
>> server_default however will be rendered.
>>
>>
>> I ran your column as given:
>>
>> target_metadata = MetaData()
>>
>> Table(
>> 't', target_metadata,
>> Column('text_column', VARCHAR(20), default='test_text',
>> server_default='test_text', nullable=True)
>> )
>>
>> alembic generates:
>>
>> def upgrade():
>> # ### commands auto generated by Alembic - please adjust! ###
>> op.create_table('t',
>> sa.Column('text_column', sa.VARCHAR(length=20),
>> server_default='test_text', nullable=True)
>> )
>> # ### end Alembic commands ###
>>
>>
>>
>> >
>> >
>> > how to set column default value ?
>> >
>> > --
>> > 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.
>> > To post to this group, send email to sqlal...@googlegroups.com.
>> > 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.
--
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.
