postgresql and perl?
Hi-
I'm a newbie at postgresql and was working on
sorting by category. What my question is, how do you
sort by category when using a variable. For instance,
you can sort by name in perl by doing:
$sqh = $dbh->prepare(q{select name from company order
by name;});
$sqh->execute();
but what if you have a variable set like:
$sort_selection = name;
How do you sort by the variable?
For instance you cannot do:
$sqh = $dbh->prepare(q{select name from company order
by ?;});
$sqh->execute($sort_selection);
OR
$sqh = $dbh->prepare(q{select name from company order
by $sort_selection;});
$sqh->execute();
If anyone could help, I would greatly appreciate it.
Thanks again!
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Peter Landis wrote:
How do you sort by the variable?
$sqh = $dbh->prepare(q{select name from company order
by $sort_selection;});
$sqh->execute();
Your problem is not Perl specific. The order by column
must be in the result set (projection). Why not doing
it this way:
my @fields = qw/name zip location/;
push @fields, $sort_selection;
$sqh = $dbh->prepare( "SELECT " . join(', ', @fields) .
" FROM company ORDER BY $sort_selction; );
$sqh->execute();
Greetings Herbie
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