Sandbox

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feel free to play around

Playground

You must create valid syntax for the gallery extension if you want to use it within DPL; add debug=5 at the beginning of your statement and check what the Template Template:Infobox Country or territory dpl produces. Gero 10:34, 4 April 2008 (CEST)

1

{{#arraydefine:x|

follow the link in the headline .. ° There was a basic version of this extension some time ago. Later it was enhanced by many new features and the name was changed to DynamicPageList2. The new version was no longer downward compatible. At the same time the name of the original extension was changed to 'Intersection' (but the documentation kept talking of DynamicPageList and the tag name still was <DynamicPageList>).

Some time later another bunch of features had been added. And the name was changed back to DynamicPageList (which was thought to be 'free').

Meanwhile some new features had also been added to 'Intersection' and recently 'Intersection' requested its original name back - which caused a real lot of confusion regarding the naming.

Currently (as of June 2009) the status is as follows:

  • Some wikimedia websites like wikinews use the old version. They call it 'Intersection' or 'DynamicPageList'. Its tag is <DynamicPageList> and the sources are in the mediawiki SVN under the path name 'DynamicPageList'.
  • Some other websites switched to DynamicPageList2 - a version which is commonly considered to be obsolete by now. They may want to change to DPL as it is 95% downward compatible with DPL2.
  • Quite a lot of websites use DPL now, i.e. the extension distributed on this website. They call it DPL or DynamicPageList. It uses the tag <dpl> and in addition offers the parser function {{#dpl: ....}}. The source is available here under Download.

There is an opinion which says that running DPL on a major public website would introduce the risk that people write queries which consume a lot of resources. And apart from there is the problem of incompatibilities between 'Intersection' and DPL. 

It is time to put an end to this mess.
  • A large effort was recently put into DPL to make it functionally 100% downward compatible with 'Intersection'. Missing commands were added and the semantics of some existing commands were slightly altered. For details read the chapter on DPL:Manual - Compatibility.
  • A concept of functional restrictions was introduced which allows it to configure DPL with different levels of functionality. The lowest level corresponds exactly to 'Intersection' as of today.
  • An advanced caching concept was introduced which makes it possible to save the result of DPL queries independent from the rest of a page. This means that this DPL cache even survives edit actions of the page containing the DPL invocation - as long as the DPL statement itself is not changed.
So, in near future there will only be one extension named DynamicPageList(DPL) which unites all previous branches.

° In the standard configuration DPL registers the <DynamicPageList> tag. This is needed to be downward compatible with extension 'Intersection'.

In the transition phase you may want to install DPL in PARALLEL to 'Intersection' for testing. DPL offers a second entry point for that purpose. Instead of require_once("DynamicPageList.php") you have to use require_once("DPLMigration.php"). DPL will then ONLY register a tag called <Intersection>

In this constellation you can change some of your existing calls of 'Intersection' (which use the <DynamicPageList> tag) to the <Intersection> tag. Once you are convinced that this produces identical results and works with equal efficiency you can change to require_once("DynamicPageList.php"). Don't forget to change the statements back to the <DynamicPageList> tag!. Of course you must also remove the require_once() for the Intersection extension. °°° The code of this extenstion uses some MySQL-specific functions which don't exist in PostgreSQL. In order to avoid patching each new version of DyanmicPageList, I suggest to run the following script on your postgres Database (from the postgres account). This simply emulates the MySQL functions. 

create schema mysql;

grant usage on schema mysql to public;

alter user wikiuser set search_path to mediawiki, public, mysql;

create or replace function mysql.concat(text, text) returns text
as $function$
  begin
    return $1 || $2;
  end;
$function$ language plpgsql immutable strict;

create or replace function mysql.if(boolean, text, text) returns text
as $function$
  begin
    if $1 then
      return $2;
    else
      return $3;
    end if;
  end;
$function$ language plpgsql immutable strict;

create or replace function mysql.ifnull(text, text) returns text
as $function$
    select coalesce($1, $2) as result
$function$ language 'sql';

° 

 {{#dplmatrix: name | yes | no | mode | '''indented_list''' }}

° 

  {{#dplnum:text}}

°

ordermethod Determines what criterium (resp. criteria) is (resp. are) used to order the list.

Syntax:

ordermethod=method1,method2,... means ordered by method1 first, then by method2, etc. (like the ORDER BY clause in SQL)

methodN can be one of the following single tokens:

categoryadd
outputs list based on most recent addition to the first category (requires to include one category and one only using 'category' parameter)
counter
outputs list based on the number of times the page has been viewed (by ~popularity)
size
outputs list based on the size of the article (bytes of wiki text)
firstedit
outputs list based on first edit to the pages (creation)
lastedit
outputs list based on most recent edit to the pages
pagetouched
outputs list based on 'page_touched' timestamp. Read comment on page_touched field in Page_table to see the difference from most recent edit by an author.
pagesel
outputs list based on the names of the reference pages which are used in the selection of a linksfrom or linksto statement. pagesel only makes sense if there is more than one page mentioned in the linksfrom or linksto condition.
title
outputs list sorted by article (prefix +) title
titlewithoutnamespace
outputs list sorted by the article name regardless of namespace — (default)

methodN can also be one of the following token combinations (see also headingmode option):

category,firstedit
outputs list sorted by category, then by first edit
category,lastedit
outputs list sorted by category, then by last edit within a category
category,pagetouched
outputs list sorted by category, then by pagetouched
category,sortkey
sortkey
outputs list sorted by title and sortkey, requires at least one category statement
user,firstedit
outputs list sorted by user, then by firstedit by the user
user,lastedit
outputs list sorted by user, then by lastedit by the user
none
do not apply any ordering (except ordering by timestamp if you requested a list of revisions); this method must be used when you specify openreferences=yes.

Note: For downward compatibility reasons DPL will use 'addfirstcategory' as its default order method if called via the <dynamicPageList>

Example: 

<DPL>
  category=Africa
  ordermethod=lastedit
</DPL>

This list will output pages that have [[Category:Africa]] showing most recently edited articles at the top. ° 

 {{#dplchapter: text | heading | limit | page | linktext }}

°|°}} {{#arraysort:x|random}} {{#arrayindex:x|0}}

3

  • Cameroon
  • Align=right

    475,442

  • Align=right

    923,768

  • Align=right

    637,657

  • Align=right

    2,505,813

2

Country Official Name Capital Dial Code
DPL Example 007 main page 1 (%COUNT%) Template:Country dpl.default
Nigunda (%COUNT%) Republic of Nigunda Bamitogoo 237
Nigunda Test (%COUNT%) Republic of Nigunda Test Bamitogoo Test 237
Somango (%COUNT%) Somango Island Aaaabququque 224

Number of data = 1

No Name Languages Government Area Population GDP Independence Day
1 Republic of Cameroon French,English Republic 183,568 sq mi 17,795,000 $43.196 billion 01/10/1961

%TOTALPAGES%

{{#dpl: category=African_Union_member_states¦Cities|resultsheader=%PAGES%|noresultsheader=none|mode=userformat

9 

{{#dpl: category=African_Union_member_states¦Cities|resultsheader=%TOTALPAGES%|noresultsheader=none|mode=userformat

9

1 3.2.1 

 good morning!
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