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<?php |
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/* |
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You may not change or alter any portion of this comment or credits |
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of supporting developers from this source code or any supporting source code |
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which is considered copyrighted (c) material of the original comment or credit authors. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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*/ |
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namespace Xoops\Core\Kernel\Model; |
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use Xoops\Core\Kernel\XoopsModelAbstract; |
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/** |
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* Object synchronization handler class. |
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* |
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* Usage of methods provided by XoopsModelSync: |
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* |
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* Step #1: set linked table and joint fields through XoopsPersistableObjectHandler: |
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* $handler->table_link = $handler->db2->prefix("the_linked_table"); |
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* full name of the linked table that is used for the query |
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* $handler->field_link = "the_linked_field"; |
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* name of field in linked table that will be used to link |
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* the linked table with current table |
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* $handler->field_object = "the_object_field"; |
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* name of field in current table that will be used to link |
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* the linked table with current table; linked field name will |
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* be used if the field name is not set |
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* Step #2: perform query |
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* |
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* @category Xoops\Core\Kernel\Model\Sync |
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* @package Xoops\Core\Kernel |
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* @author Taiwen Jiang <[email protected]> |
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* @copyright 2000-2015 XOOPS Project (http://xoops.org) |
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* @license GNU GPL 2 or later (http://www.gnu.org/licenses/gpl-2.0.html) |
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* @link http://xoops.org |
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* @since 2.3.0 |
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*/ |
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class Sync extends XoopsModelAbstract |
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{ |
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/** |
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* Clean orphan objects in this handler (child table) that are not in parent table |
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* |
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* The parameters can be defined in the handler. Naming should be updated to reflect |
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* standard relational terminology. |
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* |
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* @param string $table_link parent table |
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* @param string $field_link primary key (parent table) |
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* @param string $field_object foreign key (child table) |
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* |
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* @return bool true on success |
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*/ |
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public function cleanOrphan($table_link = '', $field_link = '', $field_object = '') |
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{ |
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if (!empty($table_link)) { |
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$this->handler->table_link = $table_link; |
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} |
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if (!empty($field_link)) { |
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$this->handler->field_link = $field_link; |
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} |
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if (!empty($field_object)) { |
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$this->handler->field_object = $field_object; |
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} |
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if (empty($this->handler->field_object) |
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|| empty($this->handler->table_link) |
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|| empty($this->handler->field_link) |
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) { |
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trigger_error( |
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"The link information is not set for '" . get_class($this->handler) . "' yet.", |
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E_USER_WARNING |
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); |
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return false; |
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} |
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// there were two versions of this sql, first for mysql 4.1+ and |
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// the second for earlier versions. |
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// TODO: Need to analyse and find the most portable query to use here |
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/* |
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$sql = "DELETE FROM `{$this->handler->table}`" |
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. " WHERE (`{$this->handler->field_object}` NOT IN " |
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. "( SELECT DISTINCT `{$this->handler->field_link}` FROM `{$this->handler->table_link}`) )"; |
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*/ |
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$sql = "DELETE `{$this->handler->table}` FROM `{$this->handler->table}`" |
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. " LEFT JOIN `{$this->handler->table_link}` AS aa " |
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. " ON `{$this->handler->table}`.`{$this->handler->field_object}` = aa.`{$this->handler->field_link}`" |
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. " WHERE (aa.`{$this->handler->field_link}` IS NULL)"; |
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return $this->handler->db2->executeUpdate($sql); |
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} |
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} |
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XOOPS /
XoopsCore
