Обсуждение: exporting/importing BLOB's (lo_* style)

Hi All;

I want to dump a set of BLOB's from one db/server and import to another.

I assume I cannot do a pg_dump unless I also dump related
pg_largeobject rows for the referenced OID

I assume I'll need to export via distinct lo_export commands and use
lo_import to insert into the second database server.

Is there a way to do a bulk transfer or export/import of lo_* style
large objects ?


Thanks in advance

kevin kempter <kevin@kevinkempterllc.com> writes:
> Hi All;
> I want to dump a set of BLOB's from one db/server and import to another.

> I assume I cannot do a pg_dump unless I also dump related
> pg_largeobject rows for the referenced OID

> I assume I'll need to export via distinct lo_export commands and use
> lo_import to insert into the second database server.

Why don't you just use pg_dump?

            regards, tom lane

kevin kempter wrote:
> Hi All;
>
> I want to dump a set of BLOB's from one db/server and import to another.
>
> I assume I cannot do a pg_dump unless I also dump related pg_largeobject
> rows for the referenced OID

pg_dump should dump large objects automatically.  If you're dumping a
single table, make sure you use the -b switch.  Saith the manpage

       -b

       --blobs
              Include large objects in the dump. This is the default  behavior
              except when --schema, --table, or --schema-only is specified, so
              the -b switch is only useful to add large objects  to  selective
              dumps.


--
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support