Обсуждение: Diffs between two databases...

I have a production server (7.4.9) with, of course, a production
database with 30 tables, 250 functions, types, views, indices, ...

My developers have created new version of the software, that includes
the new version of the datbase. They've changed 6 tables, two dozen
views and almost one hundred stored procedures. Now I need to apply
those changes on the production server.

Is there a way to generate a 'diff' script for the two databases? I'd
write script myself if I'd be able to 'script' just the desired object.
For instance, just the function.

I've seen that I can do pg_dump to a file with pg_dump -Fc, and then I
can do pg_restore -Fc -l <dump.file> to have the list of all the
database objects. There I can see the functions, but how do I (re)create
just the desired function?

What would suit me the best would be a tool/util that would drop each
db.object into a separate file. Then I could create a script wich will
'load' each object from the file when I want it (so I don't have
dependency problems).

Is there a tool like that, or should I stick with pg_dump/pg_restore, or
maybe even going trough information_schema to see all the objects in the
database?

    Mario
--
Mario Splivalo
Mob-Art
mario.splivalo@mobart.hr

"I can do it quick, I can do it cheap, I can do it well. Pick any two."

Mario Splivalo wrote:

> I've seen that I can do pg_dump to a file with pg_dump -Fc, and then I
> can do pg_restore -Fc -l <dump.file> to have the list of all the
> database objects. There I can see the functions, but how do I (re)create
> just the desired function?

Use pg_restore -L.

> What would suit me the best would be a tool/util that would drop each
> db.object into a separate file. Then I could create a script wich will
> 'load' each object from the file when I want it (so I don't have
> dependency problems).

I think you could use the "tar" method (-Ft option to pg_dump) and
extract the body of each element from the generated dump.  Treat it as a
standard tar archive.

--
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.