PL/Perl: Is there a way to use spi_prepare/spi_exec_prepared with a list as second argument?

Hello!

I'd like to dynamically prepare and execute a certain statement in
PL/perl, i.e. I don't know at the time of calling my trigger function
how many arguments I need to pass for this queries and which types they
have. The command string is assembled dynamically, as is the list of
type-identifiers and arguments.

So what i'd like to do is something like this:

my $_sQueryString = 'INSERT INTO foo VALUES ($1,$2,$3)';
my @_lColumnTypes = =('int4','int4','text');
my $_pColumnInsert = spi_prepare($_sQueryString, @_lColumnTypes);

... and a similar thing for the actual spi_exec_prepared().

So far my experiments were not successful, but that may be because I am
everything but a Perl monk :) The docs don't say anything about the
actual type of the second arguments, so I hoped that passing lists would
be somehow possible, thereby allowing for more dynamic declarations.

If this doesn't work, which would be the best way to proceed? I cannot
think of anything other than eval as a last resort.

Kind regards

Markus

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