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1 <?php 2 /** 3 * 4 * This file is part of the phpBB Forum Software package. 5 * 6 * @copyright (c) phpBB Limited <https://www.phpbb.com> 7 * @license GNU General Public License, version 2 (GPL-2.0) 8 * 9 * For full copyright and license information, please see 10 * the docs/CREDITS.txt file. 11 * 12 */ 13 14 namespace phpbb\tree; 15 16 abstract class nestedset implements \phpbb\tree\tree_interface 17 { 18 /** @var \phpbb\db\driver\driver_interface */ 19 protected $db; 20 21 /** @var \phpbb\lock\db */ 22 protected $lock; 23 24 /** @var string */ 25 protected $table_name; 26 27 /** 28 * Prefix for the language keys returned by exceptions 29 * @var string 30 */ 31 protected $message_prefix = ''; 32 33 /** 34 * Column names in the table 35 * @var string 36 */ 37 protected $column_item_id = 'item_id'; 38 protected $column_left_id = 'left_id'; 39 protected $column_right_id = 'right_id'; 40 protected $column_parent_id = 'parent_id'; 41 protected $column_item_parents = 'item_parents'; 42 43 /** 44 * Additional SQL restrictions 45 * Allows to have multiple nested sets in one table 46 * @var string 47 */ 48 protected $sql_where = ''; 49 50 /** 51 * List of item properties to be cached in the item_parents column 52 * @var array 53 */ 54 protected $item_basic_data = array('*'); 55 56 /** 57 * Construct 58 * 59 * @param \phpbb\db\driver\driver_interface $db Database connection 60 * @param \phpbb\lock\db $lock Lock class used to lock the table when moving forums around 61 * @param string $table_name Table name 62 * @param string $message_prefix Prefix for the messages thrown by exceptions 63 * @param string $sql_where Additional SQL restrictions for the queries 64 * @param array $item_basic_data Array with basic item data that is stored in item_parents 65 * @param array $columns Array with column names to overwrite 66 */ 67 public function __construct(\phpbb\db\driver\driver_interface $db, \phpbb\lock\db $lock, $table_name, $message_prefix = '', $sql_where = '', $item_basic_data = array(), $columns = array()) 68 { 69 $this->db = $db; 70 $this->lock = $lock; 71 72 $this->table_name = $table_name; 73 $this->message_prefix = $message_prefix; 74 $this->sql_where = $sql_where; 75 $this->item_basic_data = (!empty($item_basic_data)) ? $item_basic_data : array('*'); 76 77 if (!empty($columns)) 78 { 79 foreach ($columns as $column => $name) 80 { 81 $column_name = 'column_' . $column; 82 $this->$column_name = $name; 83 } 84 } 85 } 86 87 /** 88 * Returns additional sql where restrictions 89 * 90 * @param string $operator SQL operator that needs to be prepended to sql_where, 91 * if it is not empty. 92 * @param string $column_prefix Prefix that needs to be prepended to column names 93 * @return string Returns additional where statements to narrow down the tree, 94 * prefixed with operator and prepended column_prefix to column names 95 */ 96 public function get_sql_where($operator = 'AND', $column_prefix = '') 97 { 98 return (!$this->sql_where) ? '' : $operator . ' ' . sprintf($this->sql_where, $column_prefix); 99 } 100 101 /** 102 * Acquires a lock on the item table 103 * 104 * @return bool True if the lock was acquired, false if it has been acquired previously 105 * 106 * @throws \RuntimeException If the lock could not be acquired 107 */ 108 protected function acquire_lock() 109 { 110 if ($this->lock->owns_lock()) 111 { 112 return false; 113 } 114 115 if (!$this->lock->acquire()) 116 { 117 throw new \RuntimeException($this->message_prefix . 'LOCK_FAILED_ACQUIRE'); 118 } 119 120 return true; 121 } 122 123 /** 124 * {@inheritdoc} 125 */ 126 public function insert(array $additional_data) 127 { 128 $item_data = $this->reset_nestedset_values($additional_data); 129 130 $sql = 'INSERT INTO ' . $this->table_name . ' ' . $this->db->sql_build_array('INSERT', $item_data); 131 $this->db->sql_query($sql); 132 133 $item_data[$this->column_item_id] = (int) $this->db->sql_nextid(); 134 135 return array_merge($item_data, $this->add_item_to_nestedset($item_data[$this->column_item_id])); 136 } 137 138 /** 139 * Add an item which already has a database row at the end of the tree 140 * 141 * @param int $item_id The item to be added 142 * @return array Array with updated data, if the item was added successfully 143 * Empty array otherwise 144 */ 145 protected function add_item_to_nestedset($item_id) 146 { 147 $sql = 'SELECT MAX(' . $this->column_right_id . ') AS ' . $this->column_right_id . ' 148 FROM ' . $this->table_name . ' 149 ' . $this->get_sql_where('WHERE'); 150 $result = $this->db->sql_query($sql); 151 $current_max_right_id = (int) $this->db->sql_fetchfield($this->column_right_id); 152 $this->db->sql_freeresult($result); 153 154 $update_item_data = array( 155 $this->column_parent_id => 0, 156 $this->column_left_id => $current_max_right_id + 1, 157 $this->column_right_id => $current_max_right_id + 2, 158 $this->column_item_parents => '', 159 ); 160 161 $sql = 'UPDATE ' . $this->table_name . ' 162 SET ' . $this->db->sql_build_array('UPDATE', $update_item_data) . ' 163 WHERE ' . $this->column_item_id . ' = ' . (int) $item_id . ' 164 AND ' . $this->column_parent_id . ' = 0 165 AND ' . $this->column_left_id . ' = 0 166 AND ' . $this->column_right_id . ' = 0'; 167 $this->db->sql_query($sql); 168 169 return ($this->db->sql_affectedrows() == 1) ? $update_item_data : array(); 170 } 171 172 /** 173 * Remove an item from the tree without deleting it from the database 174 * 175 * Also removes all subitems from the tree without deleting them from the database either 176 * 177 * @param int $item_id The item to be deleted 178 * @return array Item ids that have been removed 179 * @throws \OutOfBoundsException 180 */ 181 protected function remove_item_from_nestedset($item_id) 182 { 183 $item_id = (int) $item_id; 184 if (!$item_id) 185 { 186 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_ITEM'); 187 } 188 189 $items = $this->get_subtree_data($item_id); 190 $item_ids = array_keys($items); 191 192 if (empty($items) || !isset($items[$item_id])) 193 { 194 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_ITEM'); 195 } 196 197 $this->remove_subset($item_ids, $items[$item_id]); 198 199 return $item_ids; 200 } 201 202 /** 203 * {@inheritdoc} 204 */ 205 public function delete($item_id) 206 { 207 $removed_items = $this->remove_item_from_nestedset($item_id); 208 209 $sql = 'DELETE FROM ' . $this->table_name . ' 210 WHERE ' . $this->db->sql_in_set($this->column_item_id, $removed_items) . ' 211 ' . $this->get_sql_where('AND'); 212 $this->db->sql_query($sql); 213 214 return $removed_items; 215 } 216 217 /** 218 * {@inheritdoc} 219 */ 220 public function move($item_id, $delta) 221 { 222 if ($delta == 0) 223 { 224 return false; 225 } 226 227 $this->acquire_lock(); 228 229 $action = ($delta > 0) ? 'move_up' : 'move_down'; 230 $delta = abs($delta); 231 232 // Keep $this->get_sql_where() here, to ensure we are in the right tree. 233 $sql = 'SELECT * 234 FROM ' . $this->table_name . ' 235 WHERE ' . $this->column_item_id . ' = ' . (int) $item_id . ' 236 ' . $this->get_sql_where(); 237 $result = $this->db->sql_query_limit($sql, $delta); 238 $item = $this->db->sql_fetchrow($result); 239 $this->db->sql_freeresult($result); 240 241 if (!$item) 242 { 243 $this->lock->release(); 244 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_ITEM'); 245 } 246 247 /** 248 * Fetch all the siblings between the item's current spot 249 * and where we want to move it to. If there are less than $delta 250 * siblings between the current spot and the target then the 251 * item will move as far as possible 252 */ 253 $sql = "SELECT {$this->column_item_id}, {$this->column_parent_id}, {$this->column_left_id}, {$this->column_right_id}, {$this->column_item_parents} 254 FROM " . $this->table_name . ' 255 WHERE ' . $this->column_parent_id . ' = ' . (int) $item[$this->column_parent_id] . ' 256 ' . $this->get_sql_where() . ' 257 AND '; 258 259 if ($action == 'move_up') 260 { 261 $sql .= $this->column_right_id . ' < ' . (int) $item[$this->column_right_id] . ' ORDER BY ' . $this->column_right_id . ' DESC'; 262 } 263 else 264 { 265 $sql .= $this->column_left_id . ' > ' . (int) $item[$this->column_left_id] . ' ORDER BY ' . $this->column_left_id . ' ASC'; 266 } 267 268 $result = $this->db->sql_query_limit($sql, $delta); 269 270 $target = false; 271 while ($row = $this->db->sql_fetchrow($result)) 272 { 273 $target = $row; 274 } 275 $this->db->sql_freeresult($result); 276 277 if (!$target) 278 { 279 $this->lock->release(); 280 // The item is already on top or bottom 281 return false; 282 } 283 284 /** 285 * $left_id and $right_id define the scope of the items that are affected by the move. 286 * $diff_up and $diff_down are the values to substract or add to each item's left_id 287 * and right_id in order to move them up or down. 288 * $move_up_left and $move_up_right define the scope of the items that are moving 289 * up. Other items in the scope of ($left_id, $right_id) are considered to move down. 290 */ 291 if ($action == 'move_up') 292 { 293 $left_id = (int) $target[$this->column_left_id]; 294 $right_id = (int) $item[$this->column_right_id]; 295 296 $diff_up = (int) $item[$this->column_left_id] - (int) $target[$this->column_left_id]; 297 $diff_down = (int) $item[$this->column_right_id] + 1 - (int) $item[$this->column_left_id]; 298 299 $move_up_left = (int) $item[$this->column_left_id]; 300 $move_up_right = (int) $item[$this->column_right_id]; 301 } 302 else 303 { 304 $left_id = (int) $item[$this->column_left_id]; 305 $right_id = (int) $target[$this->column_right_id]; 306 307 $diff_up = (int) $item[$this->column_right_id] + 1 - (int) $item[$this->column_left_id]; 308 $diff_down = (int) $target[$this->column_right_id] - (int) $item[$this->column_right_id]; 309 310 $move_up_left = (int) $item[$this->column_right_id] + 1; 311 $move_up_right = (int) $target[$this->column_right_id]; 312 } 313 314 // Now do the dirty job 315 $sql = 'UPDATE ' . $this->table_name . ' 316 SET ' . $this->column_left_id . ' = ' . $this->column_left_id . ' + CASE 317 WHEN ' . $this->column_left_id . " BETWEEN {$move_up_left} AND {$move_up_right} THEN -{$diff_up} 318 ELSE {$diff_down} 319 END, 320 " . $this->column_right_id . ' = ' . $this->column_right_id . ' + CASE 321 WHEN ' . $this->column_right_id . " BETWEEN {$move_up_left} AND {$move_up_right} THEN -{$diff_up} 322 ELSE {$diff_down} 323 END 324 WHERE 325 " . $this->column_left_id . " BETWEEN {$left_id} AND {$right_id} 326 AND " . $this->column_right_id . " BETWEEN {$left_id} AND {$right_id} 327 " . $this->get_sql_where(); 328 $this->db->sql_query($sql); 329 330 $this->lock->release(); 331 332 return true; 333 } 334 335 /** 336 * {@inheritdoc} 337 */ 338 public function move_down($item_id) 339 { 340 return $this->move($item_id, -1); 341 } 342 343 /** 344 * {@inheritdoc} 345 */ 346 public function move_up($item_id) 347 { 348 return $this->move($item_id, 1); 349 } 350 351 /** 352 * {@inheritdoc} 353 */ 354 public function move_children($current_parent_id, $new_parent_id) 355 { 356 $current_parent_id = (int) $current_parent_id; 357 $new_parent_id = (int) $new_parent_id; 358 359 if ($current_parent_id == $new_parent_id) 360 { 361 return false; 362 } 363 364 if (!$current_parent_id) 365 { 366 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_ITEM'); 367 } 368 369 $this->acquire_lock(); 370 371 $item_data = $this->get_subtree_data($current_parent_id); 372 if (!isset($item_data[$current_parent_id])) 373 { 374 $this->lock->release(); 375 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_ITEM'); 376 } 377 378 $current_parent = $item_data[$current_parent_id]; 379 unset($item_data[$current_parent_id]); 380 $move_items = array_keys($item_data); 381 382 if (($current_parent[$this->column_right_id] - $current_parent[$this->column_left_id]) <= 1) 383 { 384 $this->lock->release(); 385 return false; 386 } 387 388 if (in_array($new_parent_id, $move_items)) 389 { 390 $this->lock->release(); 391 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_PARENT'); 392 } 393 394 $sql_exclude_moved_items = $this->db->sql_in_set($this->column_item_id, $move_items, true); 395 396 $this->db->sql_transaction('begin'); 397 398 $this->remove_subset($move_items, $current_parent, false, true); 399 400 if ($new_parent_id) 401 { 402 // Retrieve new-parent again, it may have been changed... 403 $sql = 'SELECT * 404 FROM ' . $this->table_name . ' 405 WHERE ' . $this->column_item_id . ' = ' . $new_parent_id; 406 $result = $this->db->sql_query($sql); 407 $new_parent = $this->db->sql_fetchrow($result); 408 $this->db->sql_freeresult($result); 409 410 if (!$new_parent) 411 { 412 $this->db->sql_transaction('rollback'); 413 $this->lock->release(); 414 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_PARENT'); 415 } 416 417 $new_right_id = $this->prepare_adding_subset($move_items, $new_parent, true); 418 419 if ($new_right_id > $current_parent[$this->column_right_id]) 420 { 421 $diff = ' + ' . ($new_right_id - $current_parent[$this->column_right_id]); 422 } 423 else 424 { 425 $diff = ' - ' . abs($new_right_id - $current_parent[$this->column_right_id]); 426 } 427 } 428 else 429 { 430 $sql = 'SELECT MAX(' . $this->column_right_id . ') AS ' . $this->column_right_id . ' 431 FROM ' . $this->table_name . ' 432 WHERE ' . $sql_exclude_moved_items . ' 433 ' . $this->get_sql_where('AND'); 434 $result = $this->db->sql_query($sql); 435 $row = $this->db->sql_fetchrow($result); 436 $this->db->sql_freeresult($result); 437 438 $diff = ' + ' . ($row[$this->column_right_id] - $current_parent[$this->column_left_id]); 439 } 440 441 $sql = 'UPDATE ' . $this->table_name . ' 442 SET ' . $this->column_left_id . ' = ' . $this->column_left_id . $diff . ', 443 ' . $this->column_right_id . ' = ' . $this->column_right_id . $diff . ', 444 ' . $this->column_parent_id . ' = ' . $this->db->sql_case($this->column_parent_id . ' = ' . $current_parent_id, $new_parent_id, $this->column_parent_id) . ', 445 ' . $this->column_item_parents . " = '' 446 WHERE " . $this->db->sql_in_set($this->column_item_id, $move_items) . ' 447 ' . $this->get_sql_where('AND'); 448 $this->db->sql_query($sql); 449 450 $this->db->sql_transaction('commit'); 451 $this->lock->release(); 452 453 return true; 454 } 455 456 /** 457 * {@inheritdoc} 458 */ 459 public function change_parent($item_id, $new_parent_id) 460 { 461 $item_id = (int) $item_id; 462 $new_parent_id = (int) $new_parent_id; 463 464 if ($item_id == $new_parent_id) 465 { 466 return false; 467 } 468 469 if (!$item_id) 470 { 471 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_ITEM'); 472 } 473 474 $this->acquire_lock(); 475 476 $item_data = $this->get_subtree_data($item_id); 477 if (!isset($item_data[$item_id])) 478 { 479 $this->lock->release(); 480 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_ITEM'); 481 } 482 483 $item = $item_data[$item_id]; 484 $move_items = array_keys($item_data); 485 486 if (in_array($new_parent_id, $move_items)) 487 { 488 $this->lock->release(); 489 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_PARENT'); 490 } 491 492 $sql_exclude_moved_items = $this->db->sql_in_set($this->column_item_id, $move_items, true); 493 494 $this->db->sql_transaction('begin'); 495 496 $this->remove_subset($move_items, $item, false, true); 497 498 if ($new_parent_id) 499 { 500 // Retrieve new-parent again, it may have been changed... 501 $sql = 'SELECT * 502 FROM ' . $this->table_name . ' 503 WHERE ' . $this->column_item_id . ' = ' . $new_parent_id; 504 $result = $this->db->sql_query($sql); 505 $new_parent = $this->db->sql_fetchrow($result); 506 $this->db->sql_freeresult($result); 507 508 if (!$new_parent) 509 { 510 $this->db->sql_transaction('rollback'); 511 $this->lock->release(); 512 throw new \OutOfBoundsException($this->message_prefix . 'INVALID_PARENT'); 513 } 514 515 $new_right_id = $this->prepare_adding_subset($move_items, $new_parent, true); 516 517 if ($new_right_id > (int) $item[$this->column_right_id]) 518 { 519 $diff = ' + ' . ($new_right_id - (int) $item[$this->column_right_id] - 1); 520 } 521 else 522 { 523 $diff = ' - ' . abs($new_right_id - (int) $item[$this->column_right_id] - 1); 524 } 525 } 526 else 527 { 528 $sql = 'SELECT MAX(' . $this->column_right_id . ') AS ' . $this->column_right_id . ' 529 FROM ' . $this->table_name . ' 530 WHERE ' . $sql_exclude_moved_items . ' 531 ' . $this->get_sql_where('AND'); 532 $result = $this->db->sql_query($sql); 533 $row = $this->db->sql_fetchrow($result); 534 $this->db->sql_freeresult($result); 535 536 $diff = ' + ' . ((int) $row[$this->column_right_id] - (int) $item[$this->column_left_id] + 1); 537 } 538 539 $sql = 'UPDATE ' . $this->table_name . ' 540 SET ' . $this->column_left_id . ' = ' . $this->column_left_id . $diff . ', 541 ' . $this->column_right_id . ' = ' . $this->column_right_id . $diff . ', 542 ' . $this->column_parent_id . ' = ' . $this->db->sql_case($this->column_item_id . ' = ' . $item_id, $new_parent_id, $this->column_parent_id) . ', 543 ' . $this->column_item_parents . " = '' 544 WHERE " . $this->db->sql_in_set($this->column_item_id, $move_items) . ' 545 ' . $this->get_sql_where('AND'); 546 $this->db->sql_query($sql); 547 548 $this->db->sql_transaction('commit'); 549 $this->lock->release(); 550 551 return true; 552 } 553 554 /** 555 * {@inheritdoc} 556 */ 557 public function get_path_and_subtree_data($item_id, $order_asc = true, $include_item = true) 558 { 559 $condition = 'i2.' . $this->column_left_id . ' BETWEEN i1.' . $this->column_left_id . ' AND i1.' . $this->column_right_id . ' 560 OR i1.' . $this->column_left_id . ' BETWEEN i2.' . $this->column_left_id . ' AND i2.' . $this->column_right_id; 561 562 return $this->get_set_of_nodes_data($item_id, $condition, $order_asc, $include_item); 563 } 564 565 /** 566 * {@inheritdoc} 567 */ 568 public function get_path_data($item_id, $order_asc = true, $include_item = true) 569 { 570 $condition = 'i1.' . $this->column_left_id . ' BETWEEN i2.' . $this->column_left_id . ' AND i2.' . $this->column_right_id . ''; 571 572 return $this->get_set_of_nodes_data($item_id, $condition, $order_asc, $include_item); 573 } 574 575 /** 576 * {@inheritdoc} 577 */ 578 public function get_subtree_data($item_id, $order_asc = true, $include_item = true) 579 { 580 $condition = 'i2.' . $this->column_left_id . ' BETWEEN i1.' . $this->column_left_id . ' AND i1.' . $this->column_right_id . ''; 581 582 return $this->get_set_of_nodes_data($item_id, $condition, $order_asc, $include_item); 583 } 584 585 /** 586 * Get items that are related to the given item by the condition 587 * 588 * @param int $item_id Id of the item to retrieve the node set from 589 * @param string $condition Query string restricting the item list 590 * @param bool $order_asc Order the items ascending by their left_id 591 * @param bool $include_item Should the item matching the given item id be included in the list as well 592 * @return array Array of items (containing all columns from the item table) 593 * ID => Item data 594 */ 595 protected function get_set_of_nodes_data($item_id, $condition, $order_asc = true, $include_item = true) 596 { 597 $rows = array(); 598 599 $sql = 'SELECT i2.* 600 FROM ' . $this->table_name . ' i1 601 LEFT JOIN ' . $this->table_name . " i2 602 ON (($condition) " . $this->get_sql_where('AND', 'i2.') . ') 603 WHERE i1.' . $this->column_item_id . ' = ' . (int) $item_id . ' 604 ' . $this->get_sql_where('AND', 'i1.') . ' 605 ORDER BY i2.' . $this->column_left_id . ' ' . ($order_asc ? 'ASC' : 'DESC'); 606 $result = $this->db->sql_query($sql); 607 608 while ($row = $this->db->sql_fetchrow($result)) 609 { 610 if (!$include_item && $item_id == $row[$this->column_item_id]) 611 { 612 continue; 613 } 614 615 $rows[(int) $row[$this->column_item_id]] = $row; 616 } 617 $this->db->sql_freeresult($result); 618 619 return $rows; 620 } 621 622 /** 623 * Get basic data of all parent items 624 * 625 * Basic data is defined in the $item_basic_data property. 626 * Data is cached in the item_parents column in the item table 627 * 628 * @param array $item The item to get the path from 629 * @return array Array of items (containing basic columns from the item table) 630 * ID => Item data 631 */ 632 public function get_path_basic_data(array $item) 633 { 634 $parents = array(); 635 if ($item[$this->column_parent_id]) 636 { 637 if (!$item[$this->column_item_parents]) 638 { 639 $sql = 'SELECT ' . implode(', ', $this->item_basic_data) . ' 640 FROM ' . $this->table_name . ' 641 WHERE ' . $this->column_left_id . ' < ' . (int) $item[$this->column_left_id] . ' 642 AND ' . $this->column_right_id . ' > ' . (int) $item[$this->column_right_id] . ' 643 ' . $this->get_sql_where('AND') . ' 644 ORDER BY ' . $this->column_left_id . ' ASC'; 645 $result = $this->db->sql_query($sql); 646 647 while ($row = $this->db->sql_fetchrow($result)) 648 { 649 $parents[$row[$this->column_item_id]] = $row; 650 } 651 $this->db->sql_freeresult($result); 652 653 $item_parents = serialize($parents); 654 655 $sql = 'UPDATE ' . $this->table_name . ' 656 SET ' . $this->column_item_parents . " = '" . $this->db->sql_escape($item_parents) . "' 657 WHERE " . $this->column_parent_id . ' = ' . (int) $item[$this->column_parent_id]; 658 $this->db->sql_query($sql); 659 } 660 else 661 { 662 $parents = unserialize($item[$this->column_item_parents]); 663 } 664 } 665 666 return $parents; 667 } 668 669 /** 670 * Get all items from the tree 671 * 672 * @param bool $order_asc Order the items ascending by their left_id 673 * @return array Array of items (containing all columns from the item table) 674 * ID => Item data 675 */ 676 public function get_all_tree_data($order_asc = true) 677 { 678 $rows = array(); 679 680 $sql = 'SELECT * 681 FROM ' . $this->table_name . ' ' . 682 $this->get_sql_where('WHERE') . ' 683 ORDER BY ' . $this->column_left_id . ' ' . ($order_asc ? 'ASC' : 'DESC'); 684 $result = $this->db->sql_query($sql); 685 686 while ($row = $this->db->sql_fetchrow($result)) 687 { 688 $rows[(int) $row[$this->column_item_id]] = $row; 689 } 690 $this->db->sql_freeresult($result); 691 692 return $rows; 693 } 694 695 /** 696 * Remove a subset from the nested set 697 * 698 * @param array $subset_items Subset of items to remove 699 * @param array $bounding_item Item containing the right bound of the subset 700 * @param bool $set_subset_zero Should the parent, left and right id of the items be set to 0, or kept unchanged? 701 * In case of removing an item from the tree, we should the values to 0 702 * In case of moving an item, we shouldkeep the original values, in order to allow "+ diff" later 703 * @return null 704 */ 705 protected function remove_subset(array $subset_items, array $bounding_item, $set_subset_zero = true) 706 { 707 $acquired_new_lock = $this->acquire_lock(); 708 709 $diff = count($subset_items) * 2; 710 $sql_subset_items = $this->db->sql_in_set($this->column_item_id, $subset_items); 711 $sql_not_subset_items = $this->db->sql_in_set($this->column_item_id, $subset_items, true); 712 713 $sql_is_parent = $this->column_left_id . ' <= ' . (int) $bounding_item[$this->column_right_id] . ' 714 AND ' . $this->column_right_id . ' >= ' . (int) $bounding_item[$this->column_right_id]; 715 716 $sql_is_right = $this->column_left_id . ' > ' . (int) $bounding_item[$this->column_right_id]; 717 718 $set_left_id = $this->db->sql_case($sql_is_right, $this->column_left_id . ' - ' . $diff, $this->column_left_id); 719 $set_right_id = $this->db->sql_case($sql_is_parent . ' OR ' . $sql_is_right, $this->column_right_id . ' - ' . $diff, $this->column_right_id); 720 721 if ($set_subset_zero) 722 { 723 $set_left_id = $this->db->sql_case($sql_subset_items, 0, $set_left_id); 724 $set_right_id = $this->db->sql_case($sql_subset_items, 0, $set_right_id); 725 } 726 727 $sql = 'UPDATE ' . $this->table_name . ' 728 SET ' . (($set_subset_zero) ? $this->column_parent_id . ' = ' . $this->db->sql_case($sql_subset_items, 0, $this->column_parent_id) . ',' : '') . ' 729 ' . $this->column_left_id . ' = ' . $set_left_id . ', 730 ' . $this->column_right_id . ' = ' . $set_right_id . ' 731 ' . ((!$set_subset_zero) ? ' WHERE ' . $sql_not_subset_items . ' ' . $this->get_sql_where('AND') : $this->get_sql_where('WHERE')); 732 $this->db->sql_query($sql); 733 734 if ($acquired_new_lock) 735 { 736 $this->lock->release(); 737 } 738 } 739 740 /** 741 * Prepare adding a subset to the nested set 742 * 743 * @param array $subset_items Subset of items to add 744 * @param array $new_parent Item containing the right bound of the new parent 745 * @return int New right id of the parent item 746 */ 747 protected function prepare_adding_subset(array $subset_items, array $new_parent) 748 { 749 $diff = count($subset_items) * 2; 750 $sql_not_subset_items = $this->db->sql_in_set($this->column_item_id, $subset_items, true); 751 752 $set_left_id = $this->db->sql_case($this->column_left_id . ' > ' . (int) $new_parent[$this->column_right_id], $this->column_left_id . ' + ' . $diff, $this->column_left_id); 753 $set_right_id = $this->db->sql_case($this->column_right_id . ' >= ' . (int) $new_parent[$this->column_right_id], $this->column_right_id . ' + ' . $diff, $this->column_right_id); 754 755 $sql = 'UPDATE ' . $this->table_name . ' 756 SET ' . $this->column_left_id . ' = ' . $set_left_id . ', 757 ' . $this->column_right_id . ' = ' . $set_right_id . ' 758 WHERE ' . $sql_not_subset_items . ' 759 ' . $this->get_sql_where('AND'); 760 $this->db->sql_query($sql); 761 762 return $new_parent[$this->column_right_id] + $diff; 763 } 764 765 /** 766 * Resets values required for the nested set system 767 * 768 * @param array $item Original item data 769 * @return array Original item data + nested set defaults 770 */ 771 protected function reset_nestedset_values(array $item) 772 { 773 $item_data = array_merge($item, array( 774 $this->column_parent_id => 0, 775 $this->column_left_id => 0, 776 $this->column_right_id => 0, 777 $this->column_item_parents => '', 778 )); 779 780 unset($item_data[$this->column_item_id]); 781 782 return $item_data; 783 } 784 785 /** 786 * Regenerate left/right ids from parent/child relationship 787 * 788 * This method regenerates the left/right ids for the tree based on 789 * the parent/child relations. This function executes three queries per 790 * item, so it should only be called, when the set has one of the following 791 * problems: 792 * - The set has a duplicated value inside the left/right id chain 793 * - The set has a missing value inside the left/right id chain 794 * - The set has items that do not have a left/right id set 795 * 796 * When regenerating the items, the items are sorted by parent id and their 797 * current left id, so the current child/parent relationships are kept 798 * and running the function on a working set will not change the order. 799 * 800 * @param int $new_id First left_id to be used (should start with 1) 801 * @param int $parent_id parent_id of the current set (default = 0) 802 * @param bool $reset_ids Should we reset all left_id/right_id on the first call? 803 * @return int $new_id The next left_id/right_id that should be used 804 */ 805 public function regenerate_left_right_ids($new_id, $parent_id = 0, $reset_ids = false) 806 { 807 if ($acquired_new_lock = $this->acquire_lock()) 808 { 809 $this->db->sql_transaction('begin'); 810 811 if (!$reset_ids) 812 { 813 $sql = 'UPDATE ' . $this->table_name . ' 814 SET ' . $this->column_item_parents . " = '' 815 " . $this->get_sql_where('WHERE'); 816 $this->db->sql_query($sql); 817 } 818 } 819 820 if ($reset_ids) 821 { 822 $sql = 'UPDATE ' . $this->table_name . ' 823 SET ' . $this->db->sql_build_array('UPDATE', array( 824 $this->column_left_id => 0, 825 $this->column_right_id => 0, 826 $this->column_item_parents => '', 827 )) . ' 828 ' . $this->get_sql_where('WHERE'); 829 $this->db->sql_query($sql); 830 } 831 832 $sql = 'SELECT * 833 FROM ' . $this->table_name . ' 834 WHERE ' . $this->column_parent_id . ' = ' . (int) $parent_id . ' 835 ' . $this->get_sql_where('AND') . ' 836 ORDER BY ' . $this->column_left_id . ', ' . $this->column_item_id . ' ASC'; 837 $result = $this->db->sql_query($sql); 838 $rows = $this->db->sql_fetchrowset($result); 839 $this->db->sql_freeresult($result); 840 841 foreach ($rows as $row) 842 { 843 // First we update the left_id for this module 844 if ($row[$this->column_left_id] != $new_id) 845 { 846 $sql = 'UPDATE ' . $this->table_name . ' 847 SET ' . $this->db->sql_build_array('UPDATE', array($this->column_left_id => $new_id)) . ' 848 WHERE ' . $this->column_item_id . ' = ' . (int) $row[$this->column_item_id]; 849 $this->db->sql_query($sql); 850 } 851 $new_id++; 852 853 // Then we go through any children and update their left/right id's 854 $new_id = $this->regenerate_left_right_ids($new_id, $row[$this->column_item_id]); 855 856 // Then we come back and update the right_id for this module 857 if ($row[$this->column_right_id] != $new_id) 858 { 859 $sql = 'UPDATE ' . $this->table_name . ' 860 SET ' . $this->db->sql_build_array('UPDATE', array($this->column_right_id => $new_id)) . ' 861 WHERE ' . $this->column_item_id . ' = ' . (int) $row[$this->column_item_id]; 862 $this->db->sql_query($sql); 863 } 864 $new_id++; 865 } 866 867 if ($acquired_new_lock) 868 { 869 $this->db->sql_transaction('commit'); 870 $this->lock->release(); 871 } 872 873 return $new_id; 874 } 875 }
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| Generated: Mon Nov 25 19:05:08 2024 | Cross-referenced by PHPXref 0.7.1 |