Changeset 1119 for trunk/admin/include/functions.php

Timestamp:

Apr 3, 2006, 12:26:19 AM (18 years ago)

Author:

plg

Message:

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.

File:

• trunk/admin/include/functions.php (modified) (4 diffs)

trunk/admin/include/functions.php

@@ -270 +270 @@
   pwg_query($query);
 
+  // destruction of the links between images and tags
+  $query = '
+DELETE FROM '.IMAGE_TAG_TABLE.'
+  WHERE image_id IN (
+'.wordwrap(implode(', ', $ids), 80, "\n").')
+;';
+  pwg_query($query);
+
   // destruction of the favorites associated with the picture
   $query = '
@@ -575 +583 @@
     return '';
   }
-}
-
-/**
- * returns an array with relevant keywords found in the given string.
- *
- * Keywords must be separated by comma or space characters.
- *
- * @param string keywords_string
- * @return array
- */
-function get_keywords($keywords_string)
-{
-  return
-    array_unique(
-      preg_split(
-        '/[\s,]+/',
-        $keywords_string
-        )
-      );
 }
 
@@ -2095 +2084 @@
 
 /**
+ * Set tags to an image. Warning: given tags are all tags associated to the
+ * image, not additionnal tags.
+ *
+ * @param array tag ids
+ * @param int image id
+ * @return void
+ */
+function set_tags($tags, $image_id)
+{
+  $query = '
+DELETE
+  FROM '.IMAGE_TAG_TABLE.'
+  WHERE image_id = '.$image_id.'
+;';
+  pwg_query($query);
+
+  if (count($tags) > 0)
+  {
+    $inserts = array();
+    foreach ($tags as $tag_id)
+    {
+      array_push(
+        $inserts,
+        array(
+          'tag_id' => $tag_id,
+          'image_id' => $image_id
+          )
+        );
+    }
+    mass_inserts(
+      IMAGE_TAG_TABLE,
+      array_keys($inserts[0]),
+      $inserts
+      );
+  }
+}
+
+/**
+ * Add new tags to a set of images.
+ *
+ * @param array tag ids
+ * @param array image ids
+ * @return void
+ */
+function add_tags($tags, $images)
+{
+  if (count($tags) == 0 or count($tags) == 0)
+  {
+    return;
+  }
+  
+  // we can't insert twice the same {image_id,tag_id} so we must first
+  // delete lines we'll insert later
+  $query = '
+DELETE
+  FROM '.IMAGE_TAG_TABLE.'
+  WHERE image_id IN ('.implode(',', $images).')
+    AND tag_id IN ('.implode(',', $tags).')
+;';
+  pwg_query($query);
+
+  $inserts = array();
+  foreach ($images as $image_id)
+  {
+    foreach ($tags as $tag_id)
+    {
+      array_push(
+        $inserts,
+        array(
+          'image_id' => $image_id,
+          'tag_id' => $tag_id,
+          )
+        );
+    }
+  }
+  mass_inserts(
+    IMAGE_TAG_TABLE,
+    array_keys($inserts[0]),
+    $inserts
+    );
+}
+
+function tag_id_from_tag_name($tag_name)
+{
+  global $page;
+
+  if (isset($page['tag_id_from_tag_name_cache'][$tag_name]))
+  {
+    return $page['tag_id_from_tag_name_cache'][$tag_name];
+  }
+  
+  if (function_exists('mysql_real_escape_string'))
+  {
+    $tag_name = mysql_real_escape_string($tag_name);
+  }
+  else
+  {
+    $tag_name = mysql_escape_string($tag_name);
+  }
+
+  // does the tag already exist?
+  $query = '
+SELECT id
+  FROM '.TAGS_TABLE.'
+  WHERE name = \''.$tag_name.'\'
+;';
+  $existing_tags = array_from_query($query, 'id');
+
+  if (count($existing_tags) == 0)
+  {
+    mass_inserts(
+      TAGS_TABLE,
+      array('name', 'url_name'),
+      array(
+        array(
+          'name' => $tag_name,
+          'url_name' => str2url($tag_name),
+          )
+        )
+      );
+
+    $page['tag_id_from_tag_name_cache'][$tag_name] = mysql_insert_id();
+  }
+  else
+  {
+    $page['tag_id_from_tag_name_cache'][$tag_name] = $existing_tags[0];
+  }
+
+  return $page['tag_id_from_tag_name_cache'][$tag_name];
+}
+
+function set_tags_of($tags_of)
+{
+  if (count($tags_of) > 0)
+  {
+    $query = '
+DELETE
+  FROM '.IMAGE_TAG_TABLE.'
+  WHERE image_id IN ('.implode(',', array_keys($tags_of)).')
+;';
+    pwg_query($query);
+
+    $inserts = array();
+    
+    foreach ($tags_of as $image_id => $tag_ids)
+    {
+      foreach ($tag_ids as $tag_id)
+      {
+        array_push(
+          $inserts,
+          array(
+            'image_id' => $image_id,
+            'tag_id' => $tag_id,
+            )
+          );
+      }
+    }
+
+    mass_inserts(
+      IMAGE_TAG_TABLE,
+      array_keys($inserts[0]),
+      $inserts
+      );
+  }
+}
+
+/**
  * Do maintenance on all PWG tables
  *
@@ -2144 +2300 @@
 
 }
-
-
 ?>