class.ilCourseUserData.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
        |                                                                             |
        | 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; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | 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. |
        +-----------------------------------------------------------------------------+
*/

class ilCourseUserData
{
        private $db;
        private $user_id;
        private $field_id;
        private $value;
        
        
        public function __construct($a_user_id,$a_field_id = 0)
        {
                global $ilDB;
                
                $this->db = $ilDB;
                $this->user_id = $a_user_id;
                $this->field_id = $a_field_id;
                
                if($this->field_id)
                {
                        $this->read();
                }
        }
        
        public static function _getValuesByObjId($a_obj_id)
        {
                global $ilDB;
                
                include_once('Modules/Course/classes/Export/class.ilCourseDefinedFieldDefinition.php');
                $field_ids = ilCourseDefinedFieldDefinition::_getFieldIds($a_obj_id);
                if(!count($field_ids))
                {
                        return array();
                }
                $where = ("WHERE field_id IN (".implode(",",ilUtil::quoteArray($field_ids)).") ");
                
                $query = "SELECT * FROM crs_user_data ".
                        $where;
                
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $user_data[$row->usr_id][$row->field_id] = $row->value;
                }
                
                return $user_data ? $user_data : array();
        }
        
        public static function _checkRequired($a_usr_id,$a_obj_id)
        {
                global $ilDB;

                include_once('Modules/Course/classes/Export/class.ilCourseDefinedFieldDefinition.php');
                $required = ilCourseDefinedFieldDefinition::_getRequiredFieldIds($a_obj_id);
                if(!count($required))
                {
                        return true;
                }
                
                $and = ("AND field_id IN (".implode(",",ilUtil::quoteArray($required)).")");
                $query = "SELECT COUNT(*) as num_entries FROM crs_user_data ".
                        "WHERE usr_id = ".$ilDB->quote($a_usr_id)." ".
                        "AND value != '' ".
                        $and;
                $res = $ilDB->query($query);
                $row = $res->fetchRow(DB_FETCHMODE_OBJECT);
                
                return $row->num_entries == count($required);
        }
        
        public static function _deleteByUser($a_user_id)
        {
                global $ilDB;
                
                $query = "DELETE FROM crs_user_data ".
                        "WHERE usr_id = ".$ilDB->quote($a_user_id);
                $ilDB->query($query);
                                        
        }
        
        public static function _deleteByField($a_field_id)
        {
                global $ilDB;
                
                $query = "DELETE FROM crs_user_data ".
                        "WHERE field_id = ".$ilDB->quote($a_field_id);
                $ilDB->query($query);
        }
        
        public function setValue($a_value)
        {
                $this->value = $a_value;
        }
        public function getValue()
        {
                return $this->value;
        }
        
        public function update()
        {
                $this->delete();
                $this->create();        
        }
        
        public function delete()
        {
                $query = "DELETE FROM crs_user_data ".
                        "WHERE usr_id = ".$this->db->quote($this->user_id)." ".
                        "AND field_id = ".$this->db->quote($this->field_id);
                $this->db->query($query);
        }
        
        public function create()
        {
                $query = "INSERT INTO crs_user_data SET ".
                        "value = ".$this->db->quote($this->getValue()).", ".
                        "usr_id = ".$this->db->quote($this->user_id).", ".
                        "field_id = ".$this->db->quote($this->field_id)." ";
                $this->db->query($query);
        }

        private function read()
        {
                $query = "SELECT * FROM crs_user_data ".
                        "WHERE usr_id = ".$this->db->quote($this->user_id)." ".
                        "AND field_id = ".$this->db->quote($this->field_id);
                $res = $this->db->query($query);
                $row = $res->fetchRow(DB_FETCHMODE_OBJECT);

                $this->setValue($row->value);                   
                        
        }
}


?>