Re: Isnumeric function?

Theo Galanakis <Theo(dot)Galanakis(at)lonelyplanet(dot)com(dot)au> writes:
> So I came up with the following. A Insert/update trigger would call a
> procedure to check to see if the content is numeric(a whole number), if so
> would update an indexed integer column called (content_numeric). Which would
> be the base column to search appon.

> CREATE OR REPLACE FUNCTION update_content_node()
> RETURNS trigger AS
> '
> begin
> /* New function body */
> IF NEW.content ~ \'^[0-9]+$\' THEN
> NEW.content_numeric := NEW.content;
> ELSE
> NEW.content_numeric := null;

Hmm. Seems like you could get burnt by "content" that is by chance a
long string of digits --- you'd get an integer overflow error at the
attempt to assign to content_numeric. Can you make an assumption that
indexable keys are at most 9 digits? If so then
IF NEW.content ~ \'^[0-9]{1,9}$\' THEN
Or use a bigint column and crank up the number of digits appropriately.

regards, tom lane