Search Postgresql Archives

Re: Dynamically update NEW columns in plpgsql trigger

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hey Nick,

You may do it with PL/pgSQL more easily with hstore module.
Please, refer to http://www.postgresql.org/docs/9.0/static/hstore.html
Please, look at the hstore(record) and populate_record(record, hstore)
function. Hope this helps.

And I think it will be more faster then you solution.

Regards,
Dmitriy

2010/9/9 Nick <nboutelier@xxxxxxxxx>
I need to dynamically update NEW columns. Ive been inserting the NEW
values into a temp table, updating them, then passing the temp table
values back to NEW (is there a better way?). Ive had success with this
method unless there is a null value...

EXECUTE 'CREATE TEMP TABLE new AS SELECT $1.*' USING NEW;
EXECUTE 'UPDATE new SET ' || dyn_col_name || ' = 1';
EXECUTE 'SELECT * FROM new' INTO NEW;
EXECUTE 'DROP TABLE new';

This last line...
EXECUTE 'SELECT $1.' || dyn_col_name INTO val USING NEW;

gives the ERROR: could not identify column "col_one" in record data
type.

However RAISE EXCEPTION '%',NEW.col_one;
returns "1" correctly.

If col_one does does not start out as a null value, then everything
works. Why does the passing from temp table back to NEW lose the USING
functionality?

--
Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Postgresql Jobs]     [Postgresql Admin]     [Postgresql Performance]     [Linux Clusters]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Postgresql & PHP]     [Yosemite]
  Powered by Linux