I'm trying to get some additional information back from a trigger to my
embedded SQL
program, to essentially emulate Informix's way of generating serial values.
I can get the serial to be generated, but I'm trying to figure out how to get
the
generated value back to my program with minimal changes to the SQL.
I have a trigger that looks a bit like this:
create table mytable (mycol integer, mycol2 integer);
create or replace function functionfoo() returns trigger as $QUOTED$
BEGIN
new.mycol = nextval(TG_TABLE_NAME || '_mycol_seq');
raise INFO using MESSAGE = 'A Message';
return new;
END;
$QUOTED$ LANGUAGE 'plpgsql';
create trigger mytable_insert_trig before insert on mytable for each row when
(new.mycol = 0) execute procedure functionfoo();
My ecpg program looks a bit like this:
exec sql begin declare section;
long mycol1;
long mycol2;
const char *mydb;
exec sql end declare section;
mycol1 = 0;
mycol2 = 1;
mydb = "mydb";
exec sql connect to :mydb;
exec sql prepare row_insert from "insert into mytable values (?, ?)";
EXEC SQL EXECUTE row_insert using :mycol1, mycol2;
I can't figure out how to retrieve the message raised by the trigger. I know
it's
available in some cases, because I see the message when I insert a row through
psql,
but even things like this:
printf("%s\n", PQerrorMessage(ECPGget_PGconn(mydb)));
return nothing useful. Is there a way to get this information?
Thanks,
eric
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