NAME

DBD::SQLite::Cookbook - The DBD::SQLite Cookbook

DESCRIPTION

This is the DBD::SQLite cookbook.

It is intended to provide a place to keep a variety of functions and formals for use in callback APIs in DBD::SQLite.

AGGREGATE FUNCTIONS

Variance

This is a simple aggregate function which returns a variance. It is adapted from an example implementation in pysqlite.

            

              
              
package variance;
sub new { bless [], shift; }
sub step {
    my ( $self, $value ) = @_;
    push @$self, $value;
}
sub finalize {
    my $self = $_[0];
    my $n = @$self;
    # Variance is NULL unless there is more than one row
    return undef unless $n || $n == 1;
    my $mu = 0;
    foreach my $v ( @$self ) {
        $mu += $v;
    }
    $mu /= $n;
    my $sigma = 0;
    foreach my $v ( @$self ) {
        $sigma += ($v - $mu)**2;
    }
    $sigma = $sigma / ($n - 1);
    return $sigma;
}
# NOTE: If you use an older DBI (< 1.608),
# use $dbh->func(..., "create_aggregate") instead.
$dbh->sqlite_create_aggregate( "variance", 1, 'variance' );
            
          

The function can then be used as:

            

              
              
SELECT group_name, variance(score)
FROM results
GROUP BY group_name;
            
          

Variance (Memory Efficient)

A more efficient variance function, optimized for memory usage at the expense of precision:

            

              
              
package variance2;
sub new { bless {sum => 0, count=>0, hash=> {} }, shift; }
sub step {
    my ( $self, $value ) = @_;
    my $hash = $self->{hash};
    # by truncating and hashing, we can comsume many more data points
    $value = int($value); # change depending on need for precision
                          # use sprintf for arbitrary fp precision
    if (exists $hash->{$value}) {
        $hash->{$value}++;
    } else {
        $hash->{$value} = 1;
    }
    $self->{sum} += $value;
    $self->{count}++;
}
sub finalize {
    my $self = $_[0];
    # Variance is NULL unless there is more than one row
    return undef unless $self->{count} > 1;
    # calculate avg
    my $mu = $self->{sum} / $self->{count};
    my $sigma = 0;
    while (my ($h, $v) = each %{$self->{hash}}) {
        $sigma += (($h - $mu)**2) * $v;
    }
    $sigma = $sigma / ($self->{count} - 1);
    return $sigma;
}
            
          

The function can then be used as:

            

              
              
SELECT group_name, variance2(score)
FROM results
GROUP BY group_name;
            
          

Variance (Highly Scalable)

A third variable implementation, designed for arbitrarily large data sets:

            

              
              
package variance3;
sub new { bless {mu=>0, count=>0, S=>0}, shift; }
sub step {
    my ( $self, $value ) = @_;
    $self->{count}++;
    my $delta = $value - $self->{mu};
    $self->{mu} += $delta/$self->{count};
    $self->{S} += $delta*($value - $self->{mu});
}
sub finalize {
    my $self = $_[0];
    return $self->{S} / ($self->{count} - 1);
}
            
          

The function can then be used as:

            

              
              
SELECT group_name, variance3(score)
FROM results
GROUP BY group_name;
            
          

SUPPORT

Bugs should be reported via the CPAN bug tracker at

http://rt.cpan.org/NoAuth/ReportBug.html?Queue=DBD-SQLite

TO DO

• Add more and varied cookbook recipes, until we have enough to turn them into a separate CPAN distribution.

• Create a series of tests scripts that validate the cookbook recipes.

AUTHOR

Adam Kennedy <adamk@cpan.org>

COPYRIGHT

Copyright 2009 - 2012 Adam Kennedy.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

The full text of the license can be found in the LICENSE file included with this module.

cpanm DBD::SQLite

perl -MCPAN -e shell
install DBD::SQLite