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Re: Foreign Data Wrapper Handler

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The first pass thru https://www.postgresql.org/docs/12/fdwhandler.html does not tell me what I think I need to know, but I will digest this more thoroughly. Maybe I need to understand more of the lingo re: foreign data wrappers. I do understand that all fdw names must be unique within a database so if I want to connect to more than one foreign db, I need a different name for each connection. I cannot name each fdw postgres_fdw. I would like to name the fdws something like: dbname_to_foreigndbname.

For example, here are 2 possible fdws:

create foreign data wrapper stp_to_geo;
create foreign data wrapper stp_to_metrics;

That syntax creates the fdw and I can create user mappings but I cannot import any foreign schemas into my database. The error message says that there is no handler for the fdw. That's where I'm stuck.

BTW, I did try using postgres_fdw as a handler...

create foreign data wrapper stp_to_geo handler postgres_fdw;

...but then I got these errors:
ERROR:  function postgres_fdw() does not exist
ERROR:  foreign-data wrapper "stp_to_geo" does not exist

Looks like I need to study a bit more.

Sue


---
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Susan E Hurst
Principal Consultant
Brookhurst Data LLC
Email: susan.hurst@xxxxxxxxxxxxxxxxxx
Mobile: 314-486-3261

On 2020-11-07 14:51, Adrian Klaver wrote:
On 11/7/20 12:44 PM, Susan Hurst wrote:
Can anyone recommend a good online resource for learning how to set up a foreign data wrapper using a custom fdw name?  It seems the trick is to use a handler to make it work but so far the search results have been elusive for creating a fdw with a successful outcome.

Have you gone through this?:

https://www.postgresql.org/docs/12/fdwhandler.html

Also can we get a definition of 'custom fdw name'?



I'm using 'PostgreSQL 11.8 on amd64-portbld-freebsd12.1, compiled by FreeBSD clang version 8.0.1 (tags/RELEASE_801/final 366581) (based on LLVM 8.0.1), 64-bit'

Thanks for your help!

Sue






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