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$table = param("table");
$column = param("column");
...

$rows = $dbh->selectall_arrayref( "select $column from $table where ke
+y = '$value'" );

my %table_cols = ( foo_table => 'foo_column',
                   bar_table => 'bar_column',
...
   $sth->execute( $param('value'));
   my $rows = $sth->fetchall_arrayref;
}