Обсуждение: print statements?

[ 2nd try ]

Hi.  I have an automated script that essentially feeds a long sequence of  SQL statements to psql, as a single transaction.  For debugging purposes, I would like to insert the equivalent of print statements (to write messages to stdout, stderr, or maybe some pre-specified log file) at various points in this sequence.  How is this done?

Thanks!

tlm

tlm <tlm1905@gmail.com> schrieb:

> [ 2nd try ]
>
> Hi.  I have an automated script that essentially feeds a long sequence of  SQL
> statements to psql, as a single transaction.  For debugging purposes, I would
> like to insert the equivalent of print statements (to write messages to stdout,
> stderr, or maybe some pre-specified log file) at various points in this
> sequence.  How is this done?

One solution: write a little function to write out there parameter via
RAISE NOTICE and call this function on the desired places.

I mean something tike this:

test=# create function write_out(text) returns void as $$ begin raise notice '%',$1; end; $$ language plpgsql immutable
strict;
CREATE FUNCTION
test=#
test=# select write_out('hint');
NOTICE:  hint
 write_out
-----------

(1 row)


and set 'log_min_messages = notice', then can you find your messages in
the log-file.


Andreas
--
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At 08:35 AM 12/19/06, tlm wrote:
>Hi.  I have an automated script that essentially feeds a long sequence
>of  SQL statements to psql, as a single transaction.  For debugging
>purposes, I would like to insert the equivalent of print statements (to
>write messages to stdout, stderr, or maybe some pre-specified log file) at
>various points in this sequence.  How is this done?


  select 'half way already?';

Frank Bax <fbax@sympatico.ca> writes:
> At 08:35 AM 12/19/06, tlm wrote:
>> Hi.  I have an automated script that essentially feeds a long sequence
>> of  SQL statements to psql, as a single transaction.  For debugging
>> purposes, I would like to insert the equivalent of print statements (to
>> write messages to stdout, stderr, or maybe some pre-specified log file) at
>> various points in this sequence.  How is this done?

>   select 'half way already?';

Also, there's a \echo command in psql that might help.

            regards, tom lane