How to generate an sql comment using a migration file?

I’d like to use migrations to add/remove/modify columns from a database.
Rails makes that relatively painless. One feature I don’t see is the
ability to comment on columns in the schema. How can I add a column
comment to a migration?

We’re using Oracle/PosgreSQL (and we’re thinking of adding SQL Server in
the future.)

The SQL for adding a comment to a column is oddly enough the same for
all three it seems but I’d rather not take a chance.

COMMENT ON COLUMN table_name.column_name IS ‘Random Comment’;

Thanks in advance,

M

Jason C. wrote in post #984994:

I’d like to use migrations to add/remove/modify columns from a database.
Rails makes that relatively painless. One feature I don’t see is the
ability to comment on columns in the schema. How can I add a column
comment to a migration?

We’re using Oracle/PosgreSQL (and we’re thinking of adding SQL Server in
the future.)

The SQL for adding a comment to a column is oddly enough the same for
all three it seems but I’d rather not take a chance.

COMMENT ON COLUMN table_name.column_name IS ‘Random Comment’;

It’s possible run whatever SQL you like using “execute” in a migration.
I don’t think this is a common enough problem to add to the DSL of
migrations.

So for the above add this to your migration:

execute “COMMENT ON COLUMN table_name.column_name IS ‘Random Comment’”

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