logging SQL statements

Hi All,

I am trying to figure out how to call one PLSQL function from another, specifically how to access the return values from the callee.

I made two test functions, A and B. A calls B.

B returns two values:
OUT tid integer
OUT msg character varying

In caller function A, I do the following:
SELECT B(1) INTO rec; -- rec declared as a RECORD
RAISE DEBUG 'XXX % [%]', rec.tid, rec.msg;

The runtime error I got was:

ERROR: record "rec" has no field "tid"
SQL state: 42703

The full function code is below.

Thanks,
CYW

--------------------------------
FUNCTION B(IN id integer, OUT tid integer, OUT msg character varying) RETURNS record AS BODY$
DECLARE
BEGIN
msg := 'MSG';
tid := 100;
RETURN;
END;

FUNCTION A(IN x integer, IN "text" character varying, OUT whatever character varying) RETURNS character varying AS $BODY$
DECLARE
rec RECORD;
tid int4;
msg varchar;
BEGIN
SELECT B(1) INTO rec;
RAISE DEBUG 'XXX % [%]', rec.tid, rec.msg;
RETURN;
END;

<cyw@dls.net> writes:

I am trying to figure out how to call one PLSQL function from another, specifically how to access the return values from the callee.

I made two test functions, A and B. A calls B.

B returns two values:
OUT tid integer
OUT msg character varying

In caller function A, I do the following:
SELECT B(1) INTO rec; -- rec declared as a RECORD

This produces a record containing a single composite column (named "b"),
as you would see if you did the same SELECT by hand:

regression=# select b(1);
b
-----------
(100,MSG)
(1 row)

You will get the results you expect if you do something like

select * into rec from b(1);

regards, tom lane

On Thu, 9 Oct 2008, c k wrote:

Is it possible to log all sql statements submitted to database server in
a table in that database it self?

It's possible to cobble together something to appoximate that without too
much trouble if you're running V8.3. You can use the CSV log format to
make the logs show up in a tabular fashion:
http://www.postgresql.org/docs/current/static/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-CSVLOG

And then you can change log_statement (on that same page) to "all". The
main tricky part is that you need to account for log rotation and such
with whatever approach you take; you're on your own to figure out when the
server is finished with a log such that you can import it, or to write
something that imports more often. It's possible to write something to
use a "tail -f" type of approach that imports after every line is read,
but that's harder.

BTW: I'm dropping the admin list from my reply here because I'm not
subscribed to that one at the moment. It's bad form to cross-post to
multiple lists here. Pick the one you think you're more likely to get a
response on first, and only if you don't get anything useful back after a
wait should you submit your question to a second list.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD

On Oct 9, 6:23 pm, shreeseva.learn...@gmail.com ("c k") wrote:

Is it possible to log all sql statements submitted to database server in a
table in that database it self? This will be different from database logs
which are written by db server.
Regards,
CPK

I am not confident but it should be posible. some settings like debug
would log every thing in a logfile.
Will check more on this and update.
Thanks

It's surely possible.

Just enable this at postgresql.conf:
log_destination = 'stderr'
redirect_stderr = on

And then choose what to log:
log_statement = 'all'

Valid values are none, ddl, mod, and all. ddl logs all data definition
commands like CREATE, ALTER, and DROP commands. mod logs all ddl
statements, plus INSERT, UPDATE, DELETE, TRUNCATE, and COPY FROM.
PREPARE and EXPLAIN ANALYZE statements are also logged if their
contained command is of an appropriate type.

And u can modify other variables as you want.

Regards,
Joko [IT/EDP]
PT. Indra Jaya Swastika
Phone: +62 31 7481388 Ext 201
http://www.ijs.co.id

Jagadeesh wrote:

On Oct 9, 6:23 pm, shreeseva.learn...@gmail.com ("c k") wrote:

Is it possible to log all sql statements submitted to database server in a
table in that database it self? This will be different from database logs
which are written by db server.
Regards,
CPK

I am not confident but it should be posible. some settings like debug
would log every thing in a logfile.
Will check more on this and update.
Thanks

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