Why doesnt a default value affect the table in sqlalchemy?





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Im trying to update my tables and add new column, to this column should be a default Integer value, I tried to use default and also default_server as recommend here: Why isn't sqlalchemy's default column value working
but the value of this field stay null, It is possible to set Integer default value?



col = Column(field_name, data_type, default=0)

column_name = column.compile(dialect=engine.dialect)

column_type = column.type.compile(engine.dialect)

engine.execute('ALTER TABLE %s ADD COLUMN %s %s' % (table_name, column_name, column_type))





python sqlalchemy







share|improve this question

























  • Btw please tag questions using raw SQL with the DBMS you're using, since some statements can differ between them.

    – Ilja Everilä
    Jan 3 at 7:05




















0















Im trying to update my tables and add new column, to this column should be a default Integer value, I tried to use default and also default_server as recommend here: Why isn't sqlalchemy's default column value working
but the value of this field stay null, It is possible to set Integer default value?



col = Column(field_name, data_type, default=0)

column_name = column.compile(dialect=engine.dialect)

column_type = column.type.compile(engine.dialect)

engine.execute('ALTER TABLE %s ADD COLUMN %s %s' % (table_name, column_name, column_type))





python sqlalchemy







share|improve this question

























  • Btw please tag questions using raw SQL with the DBMS you're using, since some statements can differ between them.

    – Ilja Everilä
    Jan 3 at 7:05
















0












0








0








Im trying to update my tables and add new column, to this column should be a default Integer value, I tried to use default and also default_server as recommend here: Why isn't sqlalchemy's default column value working
but the value of this field stay null, It is possible to set Integer default value?



col = Column(field_name, data_type, default=0)

column_name = column.compile(dialect=engine.dialect)

column_type = column.type.compile(engine.dialect)

engine.execute('ALTER TABLE %s ADD COLUMN %s %s' % (table_name, column_name, column_type))





python sqlalchemy







share|improve this question
















Im trying to update my tables and add new column, to this column should be a default Integer value, I tried to use default and also default_server as recommend here: Why isn't sqlalchemy's default column value working
but the value of this field stay null, It is possible to set Integer default value?



col = Column(field_name, data_type, default=0)

column_name = column.compile(dialect=engine.dialect)

column_type = column.type.compile(engine.dialect)

engine.execute('ALTER TABLE %s ADD COLUMN %s %s' % (table_name, column_name, column_type))





python sqlalchemy




python sqlalchemy






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jan 3 at 6:55









Ilja Everilä

25.7k33866




25.7k33866










asked Jan 3 at 6:53









h.poeh.poe

144




144













  • Btw please tag questions using raw SQL with the DBMS you're using, since some statements can differ between them.

    – Ilja Everilä
    Jan 3 at 7:05





















  • Btw please tag questions using raw SQL with the DBMS you're using, since some statements can differ between them.

    – Ilja Everilä
    Jan 3 at 7:05



















Btw please tag questions using raw SQL with the DBMS you're using, since some statements can differ between them.

– Ilja Everilä
Jan 3 at 7:05







Btw please tag questions using raw SQL with the DBMS you're using, since some statements can differ between them.

– Ilja Everilä
Jan 3 at 7:05














1 Answer
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0














The problem is that your manual ALTER TABLE statement does not add the default and leaves the column nullable; having server_default on the Column object has no effect. If you want a default, add it:



engine.execute('ALTER TABLE %s ADD COLUMN %s %s DEFAULT 0' % (table_name, column_name, column_type))


I'd highly recommend using alembic for database migrations.






share|improve this answer


























  • perfect, thanks!

    – h.poe
    Jan 3 at 7:07











  • While I appreciate the thanks, have a look at "What should I do when someone answers my question?"

    – Ilja Everilä
    Jan 3 at 7:16












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1 Answer
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active

oldest

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1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









0














The problem is that your manual ALTER TABLE statement does not add the default and leaves the column nullable; having server_default on the Column object has no effect. If you want a default, add it:



engine.execute('ALTER TABLE %s ADD COLUMN %s %s DEFAULT 0' % (table_name, column_name, column_type))


I'd highly recommend using alembic for database migrations.






share|improve this answer


























  • perfect, thanks!

    – h.poe
    Jan 3 at 7:07











  • While I appreciate the thanks, have a look at "What should I do when someone answers my question?"

    – Ilja Everilä
    Jan 3 at 7:16
















0














The problem is that your manual ALTER TABLE statement does not add the default and leaves the column nullable; having server_default on the Column object has no effect. If you want a default, add it:



engine.execute('ALTER TABLE %s ADD COLUMN %s %s DEFAULT 0' % (table_name, column_name, column_type))


I'd highly recommend using alembic for database migrations.






share|improve this answer


























  • perfect, thanks!

    – h.poe
    Jan 3 at 7:07











  • While I appreciate the thanks, have a look at "What should I do when someone answers my question?"

    – Ilja Everilä
    Jan 3 at 7:16














0












0








0







The problem is that your manual ALTER TABLE statement does not add the default and leaves the column nullable; having server_default on the Column object has no effect. If you want a default, add it:



engine.execute('ALTER TABLE %s ADD COLUMN %s %s DEFAULT 0' % (table_name, column_name, column_type))


I'd highly recommend using alembic for database migrations.






share|improve this answer















The problem is that your manual ALTER TABLE statement does not add the default and leaves the column nullable; having server_default on the Column object has no effect. If you want a default, add it:



engine.execute('ALTER TABLE %s ADD COLUMN %s %s DEFAULT 0' % (table_name, column_name, column_type))


I'd highly recommend using alembic for database migrations.







share|improve this answer














share|improve this answer



share|improve this answer








edited Jan 3 at 7:18

























answered Jan 3 at 7:02









Ilja EveriläIlja Everilä

25.7k33866




25.7k33866













  • perfect, thanks!

    – h.poe
    Jan 3 at 7:07











  • While I appreciate the thanks, have a look at "What should I do when someone answers my question?"

    – Ilja Everilä
    Jan 3 at 7:16



















  • perfect, thanks!

    – h.poe
    Jan 3 at 7:07











  • While I appreciate the thanks, have a look at "What should I do when someone answers my question?"

    – Ilja Everilä
    Jan 3 at 7:16

















perfect, thanks!

– h.poe
Jan 3 at 7:07





perfect, thanks!

– h.poe
Jan 3 at 7:07













While I appreciate the thanks, have a look at "What should I do when someone answers my question?"

– Ilja Everilä
Jan 3 at 7:16





While I appreciate the thanks, have a look at "What should I do when someone answers my question?"

– Ilja Everilä
Jan 3 at 7:16




















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