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Re: From database to hash table

by choroba (Canon)
on Sep 06, 2012 at 16:58 UTC ( #992146=note: print w/ replies, xml ) Need Help??


in reply to From database to hash table

There is no builtin, but there is DBI:

#!/usr/bin/perl use warnings; use strict; use DBI; use Data::Dumper; my $db = DBI->connect("dbi:$driver:", q(), q()); my %hash; my $sth = $db->prepare('select week, month, workperiod from tablename' +); $sth->execute; while (my ($week, $month, $workperiod) = $sth->fetchrow_array) { $hash{$week} = [$month, $workperiod]; } print Dumper \%hash;
لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ


Comment on Re: From database to hash table
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Re^2: From database to hash table
by Tux (Monsignor) on Sep 06, 2012 at 17:26 UTC

    Faster alternative 1:

    my %hash; my %rec; my $sth = $db->prepare ("select * from tablename"); $sth->execute; $sth->bind_columns (\@hash{@{$sth->{NAME_lc}}}); while ($sth->fetch) { $hash{$rec{week}} = [ $rec{month}, $rec{workperiod} ]; }

    Faster alternative 2:

    my %hash; my $sth = $db->prepare ("select week, month, workperiod from tablename +"); $sth->execute; $sth->bind_columns (\my ($week, $month, $workperiod)); while ($sth->fetch) { $hash{$week} = [ $month, $workperiod ]; }

    Readabler alternative 3:

    my $dbh = DBI->connect ("dbi:$driver:", "user", "pass", { FetchHashKey +Name => "NAME_lc" }); my %hash; my $sth = $db->prepare ("select week, month, workperiod from tablename +"); $sth->execute; while (my $rec = $sth->fetchrow_hashref) { $hash{$rec->{week}} = [ $rec->{month}, $rec->{workperiod} ]; }

    Enjoy, Have FUN! H.Merijn

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