inc/poche/Database.class.php

   1 <?php
   2 /**
   3  * wallabag, self hostable application allowing you to not miss any content anymore
   4  *
   5  * @category   wallabag
   6  * @author     Nicolas Lœuillet <nicolas@loeuillet.org>
   7  * @copyright  2013
   8  * @license    http://opensource.org/licenses/MIT see COPYING file
   9  */
  10
  11 class Database {
  12
  13     var $handle;
  14     private $order = array (
  15         'ia' => 'ORDER BY entries.id',
  16         'id' => 'ORDER BY entries.id DESC',
  17         'ta' => 'ORDER BY lower(entries.title)',
  18         'td' => 'ORDER BY lower(entries.title) DESC',
  19         'default' => 'ORDER BY entries.id'
  20     );
  21
  22     function __construct()
  23     {
  24         switch (STORAGE) {
  25             case 'sqlite':
  26                 // Check if /db is writeable
  27                 if ( !is_writable(STORAGE_SQLITE) || !is_writable(dirname(STORAGE_SQLITE))) {
  28                         die('An error occured: "db" directory must be writeable for your web server user!');
  29                 }
  30                 $db_path = 'sqlite:' . STORAGE_SQLITE;
  31                 $this->handle = new PDO($db_path);
  32                 break;
  33             case 'mysql':
  34                 if (MYSQL_USE_UTF8MB4) {
  35                     $db_path = 'mysql:host=' . STORAGE_SERVER . ';dbname=' . STORAGE_DB . ';charset=utf8mb4';
  36                     $this->handle = new PDO($db_path, STORAGE_USER, STORAGE_PASSWORD, array(
  37                         PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8mb4',
  38                     ));
  39                 } else {
  40                     $db_path = 'mysql:host=' . STORAGE_SERVER . ';dbname=' . STORAGE_DB;
  41                     $this->handle = new PDO($db_path, STORAGE_USER, STORAGE_PASSWORD);
  42                 }
  43                 break;
  44             case 'postgres':
  45                 $db_path = 'pgsql:host=' . STORAGE_SERVER . ';dbname=' . STORAGE_DB;
  46                 $this->handle = new PDO($db_path, STORAGE_USER, STORAGE_PASSWORD);
  47                 break;
  48             default:
  49                 die(STORAGE . ' is not a recognised database system !');
  50         }
  51
  52         $this->handle->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  53         $this->_checkTags();
  54         Tools::logm('storage type ' . STORAGE);
  55     }
  56
  57     private function getHandle()
  58     {
  59         return $this->handle;
  60     }
  61
  62     private function _checkTags()
  63     {
  64
  65         if (STORAGE == 'sqlite') {
  66             $sql = '
  67                 CREATE TABLE IF NOT EXISTS tags (
  68                     id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE,
  69                     value TEXT
  70                 )';
  71         }
  72         elseif(STORAGE == 'mysql') {
  73             $sql = '
  74                 CREATE TABLE IF NOT EXISTS `tags` (
  75                   `id` int(11) NOT NULL AUTO_INCREMENT,
  76                   `value` varchar(255) NOT NULL,
  77                   PRIMARY KEY (`id`)
  78                 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
  79             ';
  80         }
  81         else {
  82             $sql = '
  83                 CREATE TABLE IF NOT EXISTS tags (
  84                   id bigserial primary key,
  85                   value varchar(255) NOT NULL
  86                 );
  87             ';
  88         }
  89
  90         $query = $this->executeQuery($sql, array());
  91
  92         if (STORAGE == 'sqlite') {
  93             $sql = '
  94                 CREATE TABLE IF NOT EXISTS tags_entries (
  95                     id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE,
  96                     entry_id INTEGER,
  97                     tag_id INTEGER,
  98                     FOREIGN KEY(entry_id) REFERENCES entries(id) ON DELETE CASCADE,
  99                     FOREIGN KEY(tag_id) REFERENCES tags(id) ON DELETE CASCADE
 100                 )';
 101         }
 102         elseif(STORAGE == 'mysql') {
 103             $sql = '
 104                 CREATE TABLE IF NOT EXISTS `tags_entries` (
 105                   `id` int(11) NOT NULL AUTO_INCREMENT,
 106                   `entry_id` int(11) NOT NULL,
 107                   `tag_id` int(11) NOT NULL,
 108                   FOREIGN KEY(entry_id) REFERENCES entries(id) ON DELETE CASCADE,
 109                   FOREIGN KEY(tag_id) REFERENCES tags(id) ON DELETE CASCADE,
 110                   PRIMARY KEY (`id`)
 111                 ) ENGINE=InnoDB  DEFAULT CHARSET=utf8;
 112             ';
 113         }
 114         else {
 115             $sql = '
 116                 CREATE TABLE IF NOT EXISTS tags_entries (
 117                   id bigserial primary key,
 118                   entry_id integer NOT NULL,
 119                   tag_id integer NOT NULL
 120                 )
 121             ';
 122         }
 123
 124         $query = $this->executeQuery($sql, array());
 125     }
 126
 127     public function install($login, $password, $email = '')
 128     {
 129         $sql = 'INSERT INTO users ( username, password, name, email) VALUES (?, ?, ?, ?)';
 130         $params = array($login, $password, $login, $email);
 131         $query = $this->executeQuery($sql, $params);
 132
 133         $sequence = '';
 134         if (STORAGE == 'postgres') {
 135             $sequence = 'users_id_seq';
 136         }
 137
 138         $id_user = intval($this->getLastId($sequence));
 139
 140         $sql = 'INSERT INTO users_config ( user_id, name, value ) VALUES (?, ?, ?)';
 141         $params = array($id_user, 'pager', PAGINATION);
 142         $query = $this->executeQuery($sql, $params);
 143
 144         $sql = 'INSERT INTO users_config ( user_id, name, value ) VALUES (?, ?, ?)';
 145         $params = array($id_user, 'language', LANG);
 146         $query = $this->executeQuery($sql, $params);
 147
 148         $sql = 'INSERT INTO users_config ( user_id, name, value ) VALUES (?, ?, ?)';
 149         $params = array($id_user, 'theme', DEFAULT_THEME);
 150         $query = $this->executeQuery($sql, $params);
 151
 152         return TRUE;
 153     }
 154
 155     public function getConfigUser($id)
 156     {
 157         $sql = "SELECT * FROM users_config WHERE user_id = ?";
 158         $query = $this->executeQuery($sql, array($id));
 159         $result = ($query) ? $query->fetchAll() : false;
 160         $user_config = false;
 161         if ($query) {
 162             $user_config = array();
 163
 164             foreach ($result as $key => $value) {
 165                 $user_config[$value['name']] = $value['value'];
 166             }
 167         }
 168
 169         return $user_config;
 170     }
 171
 172     public function userExists($username)
 173     {
 174         $sql = "SELECT * FROM users WHERE username=?";
 175         $query = $this->executeQuery($sql, array($username));
 176         $login = $query->fetchAll();
 177         return (isset($login[0]) && $query) ? true : false;
 178     }
 179
 180     public function login($username, $password, $isauthenticated = FALSE)
 181     {
 182         if ($isauthenticated) {
 183             $sql = "SELECT * FROM users WHERE username=?";
 184             $query = $this->executeQuery($sql, array($username));
 185         } else {
 186             $sql = "SELECT * FROM users WHERE username=? AND password=?";
 187             $query = $this->executeQuery($sql, array($username, $password));
 188         }
 189         $login = ($query) ? $query->fetchAll() : false;
 190
 191         $user = array();
 192         if ($login[0]) {
 193             $user['id'] = $login[0]['id'];
 194             $user['username'] = $login[0]['username'];
 195             $user['password'] = $login[0]['password'];
 196             $user['name'] = $login[0]['name'];
 197             $user['email'] = $login[0]['email'];
 198             $user['config'] = $this->getConfigUser($login[0]['id']);
 199         }
 200
 201         return $user;
 202     }
 203
 204     public function updatePassword($userId, $password)
 205     {
 206         $sql_update = "UPDATE users SET password=? WHERE id=?";
 207         $params_update = array($password, $userId);
 208         $query = $this->executeQuery($sql_update, $params_update);
 209     }
 210
 211     public function updateUserConfig($userId, $key, $value)
 212     {
 213         $config = $this->getConfigUser($userId);
 214
 215         if (! isset($config[$key])) {
 216             $sql = "INSERT INTO users_config (value, user_id, name) VALUES (?, ?, ?)";
 217         }
 218         else {
 219             $sql = "UPDATE users_config SET value=? WHERE user_id=? AND name=?";
 220         }
 221
 222         $params = array($value, $userId, $key);
 223         $query = $this->executeQuery($sql, $params);
 224     }
 225
 226     private function executeQuery($sql, $params)
 227     {
 228         try
 229         {
 230             $query = $this->getHandle()->prepare($sql);
 231             $query->execute($params);
 232             return $query;
 233         }
 234         catch (Exception $e)
 235         {
 236             Tools::logm('execute query error : '.$e->getMessage());
 237             return FALSE;
 238         }
 239     }
 240
 241     public function listUsers($username = NULL)
 242     {
 243         $sql = 'SELECT count(*) FROM users'.( $username ? ' WHERE username=?' : '');
 244         $query = $this->executeQuery($sql, ( $username ? array($username) : array()));
 245         list($count) = ($query) ? $query->fetch() : false;
 246         return $count;
 247     }
 248
 249     public function getUserPassword($userID)
 250     {
 251         $sql = "SELECT * FROM users WHERE id=?";
 252         $query = $this->executeQuery($sql, array($userID));
 253         $password = $query->fetchAll();
 254         return ($query) ? $password[0]['password'] : false;
 255     }
 256
 257     public function deleteUserConfig($userID)
 258     {
 259         $sql_action = 'DELETE from users_config WHERE user_id=?';
 260         $params_action = array($userID);
 261         $query = $this->executeQuery($sql_action, $params_action);
 262         return ($query) ? $query : false;
 263     }
 264
 265     public function deleteTagsEntriesAndEntries($userID)
 266     {
 267         $entries = $this->retrieveAll($userID);
 268         if ($entries) {
 269             foreach($entries as $entry) {
 270                 $tags = $this->retrieveTagsByEntry($entry['id']);
 271                 foreach($tags as $tag) {
 272                     $this->removeTagForEntry($entry['id'], $tags);
 273                 }
 274                 $this->deleteById($entryid,$userID);
 275             }
 276         } else {
 277             return false;
 278         }
 279     }
 280
 281     public function deleteUser($userID)
 282     {
 283         $sql_action = 'DELETE from users WHERE id=?';
 284         $params_action = array($userID);
 285         $query = $this->executeQuery($sql_action, $params_action);
 286     }
 287
 288     public function updateContentAndTitle($id, $title, $body, $user_id)
 289     {
 290         $sql_action = 'UPDATE entries SET content = ?, title = ? WHERE id=? AND user_id=?';
 291         $params_action = array($body, $title, $id, $user_id);
 292         $query = $this->executeQuery($sql_action, $params_action);
 293         return $query;
 294     }
 295
 296     public function retrieveUnfetchedEntries($user_id, $limit)
 297     {
 298
 299         $sql_limit = "LIMIT 0,".$limit;
 300         if (STORAGE == 'postgres') {
 301             $sql_limit = "LIMIT ".$limit." OFFSET 0";
 302         }
 303
 304         $sql        = "SELECT * FROM entries WHERE (content = '' OR content IS NULL) AND title LIKE '%Import%' AND user_id=? ORDER BY id " . $sql_limit;
 305         $query      = $this->executeQuery($sql, array($user_id));
 306         $entries    = $query->fetchAll();
 307
 308         return ($query) ? $entries : false;
 309     }
 310
 311     public function retrieveUnfetchedEntriesCount($user_id)
 312     {
 313       $sql        = "SELECT count(*) FROM entries WHERE (content = '' OR content IS NULL) AND title LIKE '%Import%' AND user_id=?";
 314       $query      = $this->executeQuery($sql, array($user_id));
 315       list($count) = $query->fetch();
 316
 317       return $count;
 318     }
 319
 320     public function retrieveAll($user_id)
 321     {
 322         $sql        = "SELECT * FROM entries WHERE user_id=? ORDER BY id";
 323         $query      = $this->executeQuery($sql, array($user_id));
 324         $entries    = $query->fetchAll();
 325
 326         return ($query) ? $entries : false;
 327     }
 328
 329     public function retrieveAllWithTags($user_id)
 330     {
 331         $entries = $this->retrieveAll($user_id);
 332         if ($entries) {
 333             $count = count($entries);
 334             for ($i = 0; $i < $count; $i++) {
 335               $tag_entries = $this->retrieveTagsByEntry($entries[$i]['id']);
 336               $tags = [];
 337               foreach ($tag_entries as $tag) {
 338                 $tags[] = $tag[1];
 339               }
 340               $entries[$i]['tags'] = implode(',', $tags);
 341             }
 342         }
 343         return $entries;
 344     }
 345
 346     public function retrieveOneById($id, $user_id)
 347     {
 348         $sql    = "SELECT * FROM entries WHERE id=? AND user_id=?";
 349         $params = array(intval($id), $user_id);
 350         $query  = $this->executeQuery($sql, $params);
 351         $entry  = $query->fetchAll();
 352
 353         return ($query) ? $entry[0] : false;
 354     }
 355
 356     public function retrieveOneByURL($url, $user_id)
 357     {
 358         $sql    = "SELECT * FROM entries WHERE url=? AND user_id=?";
 359         $params = array($url, $user_id);
 360         $query  = $this->executeQuery($sql, $params);
 361         $entry  = $query->fetchAll();
 362
 363         return ($query) ? $entry[0] : false;
 364     }
 365
 366     public function reassignTags($old_entry_id, $new_entry_id)
 367     {
 368         $sql    = "UPDATE tags_entries SET entry_id=? WHERE entry_id=?";
 369         $params = array($new_entry_id, $old_entry_id);
 370         $query  = $this->executeQuery($sql, $params);
 371     }
 372
 373     public function getEntriesByView($view, $user_id, $limit = '', $tag_id = 0)
 374     {
 375         switch ($view) {
 376             case 'archive':
 377                 $sql    = "SELECT * FROM entries WHERE user_id=? AND is_read=? ";
 378                 $params = array($user_id, 1);
 379                 break;
 380             case 'fav' :
 381                 $sql    = "SELECT * FROM entries WHERE user_id=? AND is_fav=? ";
 382                 $params = array($user_id, 1);
 383                 break;
 384             case 'tag' :
 385                 $sql    = "SELECT entries.* FROM entries
 386                 LEFT JOIN tags_entries ON tags_entries.entry_id=entries.id
 387                 WHERE entries.user_id=? AND tags_entries.tag_id = ? ";
 388                 $params = array($user_id, $tag_id);
 389                 break;
 390             default:
 391                 $sql    = "SELECT * FROM entries WHERE user_id=? AND is_read=? ";
 392                 $params = array($user_id, 0);
 393                 break;
 394         }
 395
 396                 $sql .= $this->getEntriesOrder().' ' . $limit;
 397
 398                 $query = $this->executeQuery($sql, $params);
 399                 $entries = $query->fetchAll();
 400
 401                 return ($query) ? $entries : false;
 402
 403     }
 404
 405     public function getEntriesByViewCount($view, $user_id, $tag_id = 0)
 406     {
 407         switch ($view) {
 408             case 'archive':
 409                     $sql    = "SELECT count(*) FROM entries WHERE user_id=? AND is_read=? ";
 410                 $params = array($user_id, 1);
 411                 break;
 412             case 'fav' :
 413                     $sql    = "SELECT count(*) FROM entries WHERE user_id=? AND is_fav=? ";
 414                 $params = array($user_id, 1);
 415                 break;
 416             case 'tag' :
 417                 $sql    = "SELECT count(*) FROM entries
 418                     LEFT JOIN tags_entries ON tags_entries.entry_id=entries.id
 419                     WHERE entries.user_id=? AND tags_entries.tag_id = ? ";
 420                 $params = array($user_id, $tag_id);
 421                 break;
 422             default:
 423                 $sql    = "SELECT count(*) FROM entries WHERE user_id=? AND is_read=? ";
 424                 $params = array($user_id, 0);
 425                 break;
 426         }
 427
 428         $query = $this->executeQuery($sql, $params);
 429         list($count) = ($query) ? $query->fetch() : array(false);
 430
 431         return $count;
 432     }
 433     public function getRandomId($user_id, $view) {
 434         $random = (STORAGE == 'mysql') ? 'RAND()' : 'RANDOM()';
 435         switch ($view) {
 436             case 'archive':
 437                 $sql = "SELECT id FROM entries WHERE user_id=? AND is_read=? ORDER BY ". $random . " LIMIT 1";
 438                 $params = array($user_id,1);
 439                 break;
 440             case 'fav':
 441                 $sql = "SELECT id FROM entries WHERE user_id=? AND is_fav=? ORDER BY ". $random . " LIMIT 1";
 442                 $params = array($user_id,1);
 443                 break;
 444             default:
 445                 $sql = "SELECT id FROM entries WHERE user_id=? AND is_read=? ORDER BY ". $random . " LIMIT 1";
 446                 $params = array($user_id,0);
 447                 break;
 448         }
 449         $query = $this->executeQuery($sql, $params);
 450         $id = $query->fetchAll();
 451
 452         return ($query) ? $id : false;
 453     }
 454
 455     public function getPreviousArticle($id, $user_id)
 456     {
 457         $sqlcondition = "is_read=0";
 458         if (STORAGE == 'postgres') {
 459             $sqlcondition = "is_read=false";
 460         }
 461         $sql = "SELECT id FROM entries WHERE id = (SELECT max(id) FROM entries WHERE id < ? AND " . $sqlcondition . ") AND user_id=? AND " . $sqlcondition;
 462         $params = array($id, $user_id);
 463         $query = $this->executeQuery($sql, $params);
 464         $id_entry = ($query) ? $query->fetchAll() : false;
 465         $id = ($query) ? $id_entry[0][0] : false;
 466         return $id;
 467     }
 468
 469     public function getNextArticle($id, $user_id)
 470     {
 471         $sqlcondition = "is_read=0";
 472         if (STORAGE == 'postgres') {
 473             $sqlcondition = "is_read=false";
 474         }
 475         $sql = "SELECT id FROM entries WHERE id = (SELECT min(id) FROM entries WHERE id > ? AND " . $sqlcondition . ") AND user_id=? AND " . $sqlcondition;
 476         $params = array($id, $user_id);
 477         $query = $this->executeQuery($sql, $params);
 478         $id_entry = ($query) ? $query->fetchAll() : false;
 479         $id = ($query) ? $id_entry[0][0] : false;
 480         return $id;
 481     }
 482
 483
 484     public function updateContent($id, $content, $user_id)
 485     {
 486         $sql_action = 'UPDATE entries SET content = ? WHERE id=? AND user_id=?';
 487         $params_action = array($content, $id, $user_id);
 488         $query = $this->executeQuery($sql_action, $params_action);
 489         return $query;
 490     }
 491
 492     /**
 493      *
 494      * @param string $url
 495      * @param string $title
 496      * @param string $content
 497      * @param integer $user_id
 498      * @return integer $id of inserted record
 499      */
 500     public function add($url, $title, $content, $user_id, $isFavorite=0, $isRead=0)
 501     {
 502         $sql_action = 'INSERT INTO entries ( url, title, content, user_id, is_fav, is_read ) VALUES (?, ?, ?, ?, ?, ?)';
 503         $params_action = array($url, $title, $content, $user_id, $isFavorite, $isRead);
 504
 505         if ( !$this->executeQuery($sql_action, $params_action) ) {
 506           $id = null;
 507         }
 508         else {
 509           $id = intval($this->getLastId( (STORAGE == 'postgres') ? 'entries_id_seq' : '') );
 510         }
 511         return $id;
 512     }
 513
 514     public function deleteById($id, $user_id)
 515     {
 516         $sql_action     = "DELETE FROM entries WHERE id=? AND user_id=?";
 517         $params_action  = array($id, $user_id);
 518         $query          = $this->executeQuery($sql_action, $params_action);
 519         return $query;
 520     }
 521
 522     public function favoriteById($id, $user_id)
 523     {
 524         $sql_action     = "UPDATE entries SET is_fav=NOT is_fav WHERE id=? AND user_id=?";
 525         $params_action  = array($id, $user_id);
 526         $query          = $this->executeQuery($sql_action, $params_action);
 527     }
 528
 529     public function archiveById($id, $user_id)
 530     {
 531         $sql_action     = "UPDATE entries SET is_read=NOT is_read WHERE id=? AND user_id=?";
 532         $params_action  = array($id, $user_id);
 533         $query          = $this->executeQuery($sql_action, $params_action);
 534     }
 535
 536     public function archiveAll($user_id)
 537     {
 538         $sql_action     = "UPDATE entries SET is_read=? WHERE user_id=? AND is_read=?";
 539         $params_action  = array($user_id, 1, 0);
 540         $query          = $this->executeQuery($sql_action, $params_action);
 541     }
 542
 543     public function getLastId($column = '')
 544     {
 545         return $this->getHandle()->lastInsertId($column);
 546     }
 547
 548     public function search($term, $user_id, $limit = '')
 549     {
 550         $search = '%'.$term.'%';
 551         $sql_action = "SELECT * FROM entries WHERE user_id=? AND (content LIKE ? OR title LIKE ? OR url LIKE ?) "; //searches in content, title and URL
 552         $sql_action .= $this->getEntriesOrder().' ' . $limit;
 553         $params_action = array($user_id, $search, $search, $search);
 554         $query = $this->executeQuery($sql_action, $params_action);
 555         return ($query) ? $query->fetchAll() : false;
 556         }
 557
 558     public function retrieveAllTags($user_id, $term = NULL)
 559     {
 560         $sql = "SELECT DISTINCT tags.*, count(entries.id) AS entriescount FROM tags
 561           LEFT JOIN tags_entries ON tags_entries.tag_id=tags.id
 562           LEFT JOIN entries ON tags_entries.entry_id=entries.id
 563           WHERE entries.user_id=?
 564             ". (($term) ? "AND lower(tags.value) LIKE ?" : '') ."
 565           GROUP BY tags.id, tags.value
 566           ORDER BY tags.value";
 567         $query = $this->executeQuery($sql, (($term)? array($user_id, strtolower('%'.$term.'%')) : array($user_id) ));
 568         $tags = ($query) ? $query->fetchAll() : false;
 569
 570         return $tags;
 571     }
 572
 573     public function retrieveTag($id, $user_id)
 574     {
 575         $sql    = "SELECT DISTINCT tags.* FROM tags
 576           LEFT JOIN tags_entries ON tags_entries.tag_id=tags.id
 577           LEFT JOIN entries ON tags_entries.entry_id=entries.id
 578           WHERE tags.id=? AND entries.user_id=?";
 579         $params = array(intval($id), $user_id);
 580         $query  = $this->executeQuery($sql, $params);
 581         $tags  = ($query) ? $query->fetchAll() : false;
 582         $tag = ($query) ? $tags[0] : false;
 583
 584         return $tag[0];
 585     }
 586
 587     public function retrieveEntriesByTag($tag_id, $user_id)
 588     {
 589         $sql =
 590             "SELECT entries.* FROM entries
 591             LEFT JOIN tags_entries ON tags_entries.entry_id=entries.id
 592             WHERE tags_entries.tag_id = ? AND entries.user_id=? ORDER by entries.id DESC";
 593         $query = $this->executeQuery($sql, array($tag_id, $user_id));
 594         $entries = ($query) ? $query->fetchAll() : false;
 595
 596         return $entries;
 597     }
 598
 599     public function retrieveTagsByEntry($entry_id)
 600     {
 601         $sql =
 602             "SELECT tags.* FROM tags
 603             LEFT JOIN tags_entries ON tags_entries.tag_id=tags.id
 604             WHERE tags_entries.entry_id = ?";
 605         $query = $this->executeQuery($sql, array($entry_id));
 606         $tags = ($query) ? $query->fetchAll() : false;
 607
 608         return $tags;
 609     }
 610
 611     public function removeTagForEntry($entry_id, $tag_id)
 612     {
 613         $sql_action     = "DELETE FROM tags_entries WHERE tag_id=? AND entry_id=?";
 614         $params_action  = array($tag_id, $entry_id);
 615         $query          = $this->executeQuery($sql_action, $params_action);
 616         return ($query) ? $query : false;
 617     }
 618
 619     public function cleanUnusedTag($tag_id)
 620     {
 621         $sql_action = "SELECT tags.* FROM tags JOIN tags_entries ON tags_entries.tag_id=tags.id WHERE tags.id=?";
 622         $query = $this->executeQuery($sql_action,array($tag_id));
 623         $tagstokeep = ($query) ? $query->fetchAll() : false;
 624         $sql_action = "SELECT tags.* FROM tags LEFT JOIN tags_entries ON tags_entries.tag_id=tags.id WHERE tags.id=?";
 625         $query = $this->executeQuery($sql_action,array($tag_id));
 626         $alltags = ($query) ? $query->fetchAll() : false;
 627
 628         if ($tagstokeep && $alltags) {
 629             foreach ($alltags as $tag) {
 630                 if ($tag && !in_array($tag,$tagstokeep)) {
 631                     $sql_action = "DELETE FROM tags WHERE id=?";
 632                     $params_action = array($tag[0]);
 633                     $this->executeQuery($sql_action, $params_action);
 634                     return true;
 635                 }
 636             }
 637         } else {
 638             return false;
 639         }
 640     }
 641
 642     public function retrieveTagByValue($value)
 643     {
 644         $sql    = "SELECT * FROM tags WHERE value=?";
 645         $params = array($value);
 646         $query  = $this->executeQuery($sql, $params);
 647         $tag  = ($query) ? $query->fetchAll() : false;
 648
 649         return ($query) ? $tag[0] : false;
 650     }
 651
 652     public function createTag($value)
 653     {
 654         $sql_action = 'INSERT INTO tags ( value ) VALUES (?)';
 655         $params_action = array($value);
 656         $query = $this->executeQuery($sql_action, $params_action);
 657         return ($query) ? $query : false;
 658     }
 659
 660     public function setTagToEntry($tag_id, $entry_id)
 661     {
 662         $sql_action = 'INSERT INTO tags_entries ( tag_id, entry_id ) VALUES (?, ?)';
 663         $params_action = array($tag_id, $entry_id);
 664         $query = $this->executeQuery($sql_action, $params_action);
 665         return ($query) ? $query : false;
 666     }
 667
 668     private function getEntriesOrder()
 669     {
 670         if (isset($_SESSION['sort']) and array_key_exists($_SESSION['sort'], $this->order)) {
 671             return $this->order[$_SESSION['sort']];
 672         }
 673         else {
 674             return $this->order['default'];
 675         }
 676     }
 677 }