问题
Is there a way to perform a pg_dump and exclude the COMMENT ON for tables/views and columns ?
I use extensively the COMMENT ON command to describe all objects, and often include newlines in them for clearer descriptions, e.g.:
COMMENT ON TABLE mytable1 IS 'MAIN TABLE...
NOTES:
1. ...
2. ...
3. ...
';
However, since there are newlines in the dump as well, I cannot simply remove the comments with a grep -v 'COMMENT ON' command.
Any other way to quickly remove these COMMENT ON from the dump ?
回答1:
I would actually do this with a two-stage dump and restore.
Dump and restore the db as is or create a new db from the old one with
createdb -T
orCREATE DATABASE WITH TEMPLATE
Run the following command
Delete from pg_description;
- Dump and restore that database. That will ensure you don't have any annoying dependencies floating around.
回答2:
AFAIK, neither pg_dump
nor pg_restore
have options to remove COMMENT
s. But, if you use a binary dump format like:
$ pg_dump -Fc <your connection> -f /path/to/backup.dump
you could extract the TOC entry and edit it:
$ pg_restore -l -f /path/to/backup.toc /path/to/backup.dump
The above will extract a TOC file and save it at /path/to/backup.toc
, then you could find each line with COMMENT
entry and remove or comment it. If you don't use strange names on your objects, a simple sed
would solve the problem, to comment the lines with COMMENT
s you could do this (a semicolon starts a comment):
$ sed -i 's/^\(.* COMMENT .*\)/;\1/g' bar.toc
With this new TOC file, you can now use pg_restore
to restore your dump (with -L
option):
$ pg_restore -L /path/to/backup.toc -d <your database> /path/to/backup.dump
来源:https://stackoverflow.com/questions/17027611/pg-dump-without-comments-on-objects