Excerpts from Jim Nasby's message of mié ago 31 16:45:59 -0300 2011:
> On Aug 26, 2011, at 5:23 PM, Andrew Dunstan wrote:
> > On 08/26/2011 04:46 PM, Jim Nasby wrote:
> >> On Aug 26, 2011, at 12:15 PM, Andrew Dunstan wrote:
> >>> I knew there would be some bike-shedding about how we specify these things, which is why I haven't written docs
yet.
> >> While we're debating what shade of yellow to paint the shed...
> >>
> >> My actual use case is to be able to be able to "inject" SQL into a SQL-formatted dump either pre- or post-data
(I'mon 8.3, so I don't actually dump any data; I'm *mostly* emulating the ability to dump data on just certain
tables).
> >>
> >> So for what I'm doing, the ideal interface would be a way to tell pg_dump "When you're done dumping all table
structuresbut before you get to any constraints, please run $COMMAND and inject it's output into the dump output." For
someof the data obfuscation we're doing it would be easiest if $COMMAND was a perl script instead of SQL, but we could
probablyconvert it.
> >>
> >> Of course, many other folks actually need the ability to just spit out specific portions of the dump; I'm hoping
wecan come up with something that supports both concepts.
> >>
> >
> > Well, the Unix approach is to use tools that do one thing well to build up more complex tools. Making pg_dump run
someexternal command to inject things into the stream seems like the wrong thing given this philosophy. Use pg_dump to
getthe bits you want (pre-data, post-data) and sandwich them around whatever else you want.
>
> I agree... except for one little niggling concern: If pg_dump is injecting something, then the DDL is being grabbed
witha single, consistent snapshot. --pre and --post do not get you that (though we could probably use the new ability
toexport snapshots to fix that...)
Eh, --pre and --post are pg_restore flags, so you already have a
consistent snapshot.
--
Álvaro Herrera <alvherre@commandprompt.com>
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