DBI output and Template Toolkit

Qiang has asked for the wisdom of the Perl Monks concerning the following question:

hello,

using DBI and Template Toolkit.

my webapp needs to fetch 100-300 rows with 5-6 columns and display them using Template. i don't want to reference each col by index from my template so i chose to fetch hashref. what i have is something like:

    my $sth = $dbh->prepare_cached( $sql );
    $sth->execute( @bind_vals );
    $result = $sth->fetchall_hashref( $name );
    $tt->process("result.tt", { result => $result })
[download]

but knowing that fetchall_hashref being the slowest among fetchall_arrayref and fetchrow_arrayref. i tried to use bind_columns and fetchrow_arrayref :

    my ( %row , @rows );
    $sth->bind_columns( \( @row{ @{$sth->{NAME_lc}} } ) );
    while ( $sth->fetchrow_arrayref ) {
        my %row_copy = %row;
        push @rows, \%row_copy;
    }
    $tt->process("result.tt", { result => \@rows })
[download]

i got all result in nice AoH structure. but that defeats the purpose of bind_columns.

the DBI example of using bind_columns are fine as it prints out the fetched result in each loop. I can't do that and still use my template.

so my question is how do you use bind_columns with Template that require you to collect all results first?

UPDATE: my last sentence is bit misleading. i am wondering if there are better way to achive the same goal?

Comment on DBI output and Template Toolkit Select or Download Code

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Re: DBI output and Template Toolkit by ikegami (Patriarch) on Mar 23, 2007 at 16:14 UTC
so my question is how do you use bind_columns with Template that require you to collect all results first? You're already doing it. A couple of quick ~~notes~~nits: `my %row_copy = %row; push @rows, \%row_copy;` [download] is the same as `push @rows, { %row };` [download] When I use `bind_columns`, I find using `while ( $sth->fetchrow_arrayref ) {` [download] to be somewhat misleading since there's no array_ref involved. Instead, I use `while ( $sth->fetch ) {` [download] `fetch` and `fetchrow_arrayref` are the same function.	[reply] [d/l] [select]

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Re: DBI output and Template Toolkit
by ikegami (Patriarch) on Mar 23, 2007 at 16:14 UTC

so my question is how do you use bind_columns with Template that require you to collect all results first?

You're already doing it.

A couple of quick ~~notes~~nits:

my %row_copy = %row;
push @rows, \%row_copy;
[download]

is the same as

push @rows, { %row };
[download]

When I use bind_columns, I find using
```
while ( $sth->fetchrow_arrayref ) {
[download]
```
to be somewhat misleading since there's no array_ref involved. Instead, I use
```
while ( $sth->fetch ) {
[download]
```
fetch and fetchrow_arrayref are the same function.

[reply]
[d/l]
[select]