On 06/04/2013 11:22 PM, Warwick Prince wrote:
On 06/04/2013 10:46 PM, Michael Bayer wrote:
There's a long standing ticket to add support for comments, at least at the DDL
level. I don't think anyone has looked into what level of support we get from
the various backends as far as reflection.
So its something the library has room for, but it's an open item for now. The
four-year-old ticket is http://www.sqlalchemy.org/trac/ticket/1546.
On Jun 4, 2013, at 8:33 PM, Warwick Prince <warwi...@mushroomsys.com> wrote:
Hi Michael
I'm toying with the idea of embedding some metadata into the comments on
columns and/or the table comment. Is there a way to reliably read the comment
from the column definition via reflection across all dialects that would
support a comment at a column level? Also, can I read the comment normally
attached to the table definition?
Thanks
Warwick
If this metadata will be used just in sqlalchemy (or python libraries up in the
stack), you could use the info parameter when creating columns.
OK - sounds promising. What actually is the 'info' that it reads/writes? i.e.
where is it getting it from/putting it in the DB? (Or does it only reside in
the Python code?)
It is a dictionary and you can store whatever you want in there (please
see
http://docs.sqlalchemy.org/en/rel_0_8/core/schema.html#sqlalchemy.schema.SchemaItem.info
for more info about it). This information is only available on Python code.
Also, I'd like to +1 the task to reflect the comments with support for as many
dialects as possible :-) We have developed a large platform using SQLA as the
ORM, and as part of the maintenance area we have a generic database manager
that is intended to allow maintenance, viewing, manual row insertion/deletion
etc (Like MySQL Workbench et al) that is 100% database agnostic. Comments are
missing at the moment which is a shame.
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