dblink_exec: can it perform a remote function?

Oh, I just noticed, I forgot to post the error message of the second
try. This one, I can understand.
psql:test_02.sql:21: ERROR: statement returning results not allowed
CONTEXT: SQL statement "SELECT dblink_exec('pragma','select
WARN(P_MESSAGE := ''Raise dblink test'');')"

On 22.03.2016 12:33, Thiemo Kellner wrote:

Hi all

I am trying to execute a function on a remote server using dblink to
test stuff.

My function is:
create or replace function /*LOGGER.*/WARN(in P_MESSAGE text)
returns void as
$warn$
begin
raise debug '%', P_MESSAGE;
raise log '%', P_MESSAGE;
raise info '%', P_MESSAGE;
raise notice '%', P_MESSAGE;
raise warning '%', P_MESSAGE;
end;
$warn$ language PLPGSQL;

I try to execute it with:
do language PLPGSQL
$anonymous$
begin
set session client_min_messages to log;
perform dblink_connect_u('pragma','dbname=thiemo password=XXX');
perform dblink_exec('pragma','perform WARN(P_MESSAGE := ''Raise
dblink test'');');
perform dblink_exec('pragma','commit;');
perform dblink_disconnect('pragma');
end;
$anonymous$

I get the error:
psql:test_02.sql:22: ERROR: syntax error at or near "perform"
CONTEXT: Error occurred on dblink connection named "pragma": could not
execute command.
SQL statement "SELECT dblink_exec('pragma','perform WARN(P_MESSAGE :=
''Raise dblink test'');')"
PL/pgSQL function inline_code_block line 12 at PERFORM

If I try to execute it with:
do language PLPGSQL
$anonymous$
begin
set session client_min_messages to log;
perform dblink_connect_u('pragma','dbname=thiemo password=XXX');
perform dblink_exec('pragma','select WARN(P_MESSAGE := ''Raise
dblink test'');');
perform dblink_exec('pragma','commit;');
perform dblink_disconnect('pragma');
end;
$anonymous$

Isn't it possible to execute funtions through dblink? Any hint is
appreciated.

Kind regards

Thiemo

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On 03/22/2016 04:39 AM, Thiemo Kellner wrote:

Oh, I just noticed, I forgot to post the error message of the second
try. This one, I can understand.
psql:test_02.sql:21: ERROR: statement returning results not allowed
CONTEXT: SQL statement "SELECT dblink_exec('pragma','select
WARN(P_MESSAGE := ''Raise dblink test'');')"

http://www.postgresql.org/docs/9.5/static/contrib-dblink-exec.html

"dblink_exec executes a command (that is, any SQL statement that doesn't
return rows) in a remote database."

What I think you are looking for:

http://www.postgresql.org/docs/9.5/static/contrib-dblink-function.html

"dblink executes a query (usually a SELECT, but it can be any SQL
statement that returns rows) in a remote database."

On 22.03.2016 12:33, Thiemo Kellner wrote:

Hi all

I am trying to execute a function on a remote server using dblink to
test stuff.

My function is:
create or replace function /*LOGGER.*/WARN(in P_MESSAGE text)
returns void as
$warn$
begin
raise debug '%', P_MESSAGE;
raise log '%', P_MESSAGE;
raise info '%', P_MESSAGE;
raise notice '%', P_MESSAGE;
raise warning '%', P_MESSAGE;
end;
$warn$ language PLPGSQL;

I try to execute it with:
do language PLPGSQL
$anonymous$
begin
set session client_min_messages to log;
perform dblink_connect_u('pragma','dbname=thiemo password=XXX');
perform dblink_exec('pragma','perform WARN(P_MESSAGE := ''Raise
dblink test'');');
perform dblink_exec('pragma','commit;');
perform dblink_disconnect('pragma');
end;
$anonymous$

I get the error:
psql:test_02.sql:22: ERROR: syntax error at or near "perform"
CONTEXT: Error occurred on dblink connection named "pragma": could not
execute command.
SQL statement "SELECT dblink_exec('pragma','perform WARN(P_MESSAGE :=
''Raise dblink test'');')"
PL/pgSQL function inline_code_block line 12 at PERFORM

If I try to execute it with:
do language PLPGSQL
$anonymous$
begin
set session client_min_messages to log;
perform dblink_connect_u('pragma','dbname=thiemo password=XXX');
perform dblink_exec('pragma','select WARN(P_MESSAGE := ''Raise
dblink test'');');
perform dblink_exec('pragma','commit;');
perform dblink_disconnect('pragma');
end;
$anonymous$

Isn't it possible to execute funtions through dblink? Any hint is
appreciated.

Kind regards

Thiemo

--
Adrian Klaver
adrian.klaver@aklaver.com

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