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Full Discussion: How To Sort Array of Hashes ??
Top Forums Shell Programming and Scripting How To Sort Array of Hashes ?? Post 71239 by cbkihong on Monday 9th of May 2005 09:31:36 AM
Old 05-09-2005
Perl's sort function is immensely powerful (and somewhat difficult to explain) that lets you sort in any way you desire. Theoretically you can put the condition (the comparator) in the sort {} block to generate a custom ordering for your case. But your question is not precise. And you cannot simply say keep 32 and 18 together, because what should be the ordering of other array items with respect to 32 and 18, respectively? And the order of 32 and 18? If these questions are not defined, the condition in the sort {} block will not be accurate to establish a total ordering, and the sorted results will then be non-deterministic (i.e. simply wrong).

Mathematically speaking, given a total of n items to sort, you need to define all possible permutations of any two items in the block, i.e. n * n, and the ordering should be absolutely consistent. So, if you define a certain item x(i) -> 32 and 32 -> 18, the condition in the block should never, ever, generate the order 18 -> x(i), or any other items preceding x(i).

In general, if a given sort order is not intuitive, and you cannot specify an algorithm to establish the total ordering, I will suggest getting the normally sorted results and manipulate the rest yourself with another array. For this, I guess you should try to do this yourself.
 

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LEARN ABOUT MOJAVE

net::ldap::control::sort

Net::LDAP::Control::Sort(3)				User Contributed Perl Documentation			       Net::LDAP::Control::Sort(3)

NAME

       Net::LDAP::Control::Sort - Server Side Sort (SSS) control object

SYNOPSIS

	use Net::LDAP::Control::Sort;
	use Net::LDAP::Constant qw(LDAP_CONTROL_SORTRESULT);

	$sort = Net::LDAP::Control::Sort->new(
	  order => "cn -phone"
	);

	$mesg = $ldap->search( @args, control => [ $sort ]);

	($resp) = $mesg->control( LDAP_CONTROL_SORTRESULT );

	print "Results are sorted
"  if $resp and !$resp->result;

DESCRIPTION

       "Net::LDAP::Control::Sort" is a sub-class of Net::LDAP::Control.  It provides a class for manipulating the LDAP Server Side Sort (SSS)
       request control 1.2.840.113556.1.4.473 as defined in RFC-2891

       If the server supports sorting, then the response from a search operation will include a sort result control. This control is handled by
       Net::LDAP::Control::SortResult.

CONSTRUCTOR ARGUMENTS

       order
	   A string which defines how entries may be sorted. It consists of multiple directives, separated by whitespace. Each directive describes
	   how to sort entries using a single attribute. If two entries have identical attributes, then the next directive in the list is used.

	   Each directive specifies a sorting order as follows

	     -attributeType:orderingRule

	   The leading "-" is optional, and if present indicates that the sorting order should be reversed. "attributeType" is the attribute name
	   to sort by. "orderingRule" is optional and indicates the rule to use for the sort and should be valid for the given "attributeType".

	   Any one attributeType should only appear once in the sorting list.

	   Examples

	     "cn"	  sort by cn using the default ordering rule for the cn attribute
	     "-cn"	  sort by cn using the reverse of the default ordering rule
	     "age cn"	  sort by age first, then by cn using the default ordering rules
	     "cn:1.2.3.4" sort by cn using the ordering rule defined as 1.2.3.4

METHODS

       As with Net::LDAP::Control each constructor argument described above is also available as a method on the object which will return the
       current value for the attribute if called without an argument, and set a new value for the attribute if called with an argument.

SEE ALSO

       Net::LDAP, Net::LDAP::Control::SortResult, Net::LDAP::Control, http://www.ietf.org/rfc/rfc2891.txt

AUTHOR

       Graham Barr <gbarr@pobox.com>

       Please report any bugs, or post any suggestions, to the perl-ldap mailing list <perl-ldap@perl.org>

COPYRIGHT

       Copyright (c) 1999-2004 Graham Barr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the
       same terms as Perl itself.

perl v5.18.2							    2013-07-21					       Net::LDAP::Control::Sort(3)
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