improvement: tags replace keywords. Better data model, less

limitations. Each image can be associated to as many tag as needed. Tags can
contain non ASCII characters. Oriented navigation with tags by association.


git-svn-id: http://piwigo.org/svn/trunk@1119 68402e56-0260-453c-a942-63ccdbb3a9ee

1 files changed, 151 insertions, 0 deletions

diff --git a/install/db/19-database.php b/install/db/19-database.php
new file mode 100644
index 000000000..035aff95a
--- /dev/null
+++ b/install/db/19-database.php
@@ -0,0 +1,151 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | PhpWebGallery - a PHP based picture gallery                           |
+// | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net |
+// | Copyright (C) 2003-2005 PhpWebGallery Team - http://phpwebgallery.net |
+// +-----------------------------------------------------------------------+
+// | branch        : BSF (Best So Far)
+// | file          : $RCSfile$
+// | last update   : $Date: 2005-09-21 00:04:57 +0200 (mer, 21 sep 2005) $
+// | last modifier : $Author: plg $
+// | revision      : $Revision: 870 $
+// +-----------------------------------------------------------------------+
+// | This program is free software; you can redistribute it and/or modify  |
+// | it under the terms of the GNU General Public License as published by  |
+// | the Free Software Foundation                                          |
+// |                                                                       |
+// | This program is distributed in the hope that it will be useful, but   |
+// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
+// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
+// | General Public License for more details.                              |
+// |                                                                       |
+// | You should have received a copy of the GNU General Public License     |
+// | along with this program; if not, write to the Free Software           |
+// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
+// | USA.                                                                  |
+// +-----------------------------------------------------------------------+
+
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+$upgrade_description = '#images.keywords moved to new table #tags';
+
+// +-----------------------------------------------------------------------+
+// |                              New tables                               |
+// +-----------------------------------------------------------------------+
+
+$query = '
+CREATE TABLE '.PREFIX_TABLE.'tags (
+  id smallint(5) UNSIGNED NOT NULL auto_increment,
+  name varchar(255) BINARY NOT NULL,
+  url_name varchar(255) BINARY NOT NULL,
+  PRIMARY KEY (id)
+) TYPE=MyISAM
+;';
+pwg_query($query);
+
+$query = '
+CREATE TABLE '.PREFIX_TABLE.'image_tag (
+  image_id mediumint(8) UNSIGNED NOT NULL,
+  tag_id smallint(5) UNSIGNED NOT NULL,
+  PRIMARY KEY (image_id,tag_id)
+) TYPE=MyISAM
+;';
+pwg_query($query);
+
+// +-----------------------------------------------------------------------+
+// |                        Move keywords to tags                          |
+// +-----------------------------------------------------------------------+
+
+// each tag label is associated to a numeric identifier
+$tag_id = array();
+// to each tag id (key) a list of image ids (value) is associated
+$tag_images = array();
+
+$current_id = 1;
+
+$query = '
+SELECT id, keywords
+  FROM '.PREFIX_TABLE.'images
+  WHERE keywords IS NOT NULL
+;';
+$result = pwg_query($query);
+while ($row = mysql_fetch_array($result))
+{
+  foreach(preg_split('/[,]+/', $row['keywords']) as $keyword)
+  {
+    if (!isset($tag_id[$keyword]))
+    {
+      $tag_id[$keyword] = $current_id++;
+    }
+    
+    if (!isset($tag_images[ $tag_id[$keyword] ]))
+    {
+      $tag_images[ $tag_id[$keyword] ] = array();
+    }
+
+    array_push($tag_images[ $tag_id[$keyword] ], $row['id']);
+  }
+}
+
+$datas = array();
+foreach ($tag_id as $tag_name => $tag_id)
+{
+  array_push(
+    $datas,
+    array(
+      'id'       => $tag_id,
+      'name'     => $tag_name,
+      'url_name' => str2url($tag_name),
+      )
+    );
+}
+mass_inserts(
+  PREFIX_TABLE.'tags',
+  array_keys($datas[0]),
+  $datas
+  );
+
+$datas = array();
+foreach ($tag_images as $tag_id => $images)
+{
+  foreach (array_unique($images) as $image_id)
+  {
+    array_push(
+      $datas,
+      array(
+        'tag_id'   => $tag_id,
+        'image_id' => $image_id,
+        )
+      );
+  }
+}
+
+mass_inserts(
+  PREFIX_TABLE.'image_tag',
+  array_keys($datas[0]),
+  $datas
+  );
+
+// +-----------------------------------------------------------------------+
+// |                         Delete images.keywords                        |
+// +-----------------------------------------------------------------------+
+
+$query = '
+ALTER TABLE '.PREFIX_TABLE.'images DROP COLUMN keywords
+;';
+pwg_query($query);
+
+// +-----------------------------------------------------------------------+
+// |                           End notification                            |
+// +-----------------------------------------------------------------------+
+
+echo
+"\n"
+.'Table '.PREFIX_TABLE.'tags created and filled'."\n"
+.'Table '.PREFIX_TABLE.'image_tag created and filled'."\n"
+.'Column '.PREFIX_TABLE.'images.keywords dropped'."\n"
+;
+?>