Rechercher une page de manuel
DBIx::Class::ResultSetColumn.3pm
Langue: en
Version: 2007-06-17 (mandriva - 01/05/08)
Section: 3 (Bibliothèques de fonctions)
NAME
DBIx::Class::ResultSetColumn - helpful methods for messing with a single column of the resultset
SYNOPSIS
$rs = $schema->resultset('CD')->search({ artist => 'Tool' }); $rs_column = $rs->get_column('year'); $max_year = $rs_column->max; #returns latest year
DESCRIPTION
A convenience class used to perform operations on a specific column of a resultset.METHODS
new
my $obj = DBIx::Class::ResultSetColumn->new($rs, $column);
Creates a new resultset column object from the resultset and column passed as params. Used internally by ``get_column'' in DBIx::Class::ResultSet.
next
- Arguments: none
- Return Value: $value
Returns the next value of the column in the resultset (or "undef" if there is none).
Much like ``next'' in DBIx::Class::ResultSet but just returning the one value.
all
- Arguments: none
- Return Value: @values
Returns all values of the column in the resultset (or "undef" if there are none).
Much like ``all'' in DBIx::Class::ResultSet but returns values rather than row objects.
min
- Arguments: none
- Return Value: $lowest_value
my $first_year = $year_col->min();
Wrapper for ->func. Returns the lowest value of the column in the resultset (or "undef" if there are none).
max
- Arguments: none
- Return Value: $highest_value
my $last_year = $year_col->max();
Wrapper for ->func. Returns the highest value of the column in the resultset (or "undef" if there are none).
sum
- Arguments: none
- Return Value: $sum_of_values
my $total = $prices_col->sum();
Wrapper for ->func. Returns the sum of all the values in the column of the resultset. Use on varchar-like columns at your own risk.
func
- Arguments: $function
- Return Value: $function_return_value
$rs = $schema->resultset("CD")->search({}); $length = $rs->get_column('title')->func('LENGTH');
Runs a query using the function on the column and returns the value. Produces the following SQL:
SELECT LENGTH( title ) FROM cd me
AUTHORS
Luke Saunders <luke.saunders@gmail.com>Jess Robinson
LICENSE
You may distribute this code under the same terms as Perl itself.Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre