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<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2019, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package     CodeIgniter
 * @author      EllisLab Dev Team
 * @copyright   Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright   Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @license     https://opensource.org/licenses/MIT     MIT License
 * @link        https://codeigniter.com
 * @since       Version 3.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * PDO 4D Database Adapter Class
 *
 * Note: _DB is an extender class that the app controller
 * creates dynamically based on whether the query builder
 * class is being used or not.
 *
 * @package             CodeIgniter
 * @subpackage  Drivers
 * @category    Database
 * @author              EllisLab Dev Team
 * @link                https://codeigniter.com/user_guide/database/
 */
class CI_DB_pdo_4d_driver extends CI_DB_pdo_driver {

        /**
         * Sub-driver
         *
         * @var string
         */
        public $subdriver = '4d';

        /**
         * Identifier escape character
         *
         * @var string[]
         */
        protected $_escape_char = array('[', ']');

        // --------------------------------------------------------------------

        /**
         * Class constructor
         *
         * Builds the DSN if not already set.
         *
         * @param       array   $params
         * @return      void
         */
        public function __construct($params)
        {
                parent::__construct($params);

                if (empty($this->dsn))
                {
                        $this->dsn = '4D:host='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname);

                        empty($this->port) OR $this->dsn .= ';port='.$this->port;
                        empty($this->database) OR $this->dsn .= ';dbname='.$this->database;
                        empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set;
                }
                elseif ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 3) === FALSE)
                {
                        $this->dsn .= ';charset='.$this->char_set;
                }
        }

        // --------------------------------------------------------------------

        /**
         * Show table query
         *
         * Generates a platform-specific query string so that the table names can be fetched
         *
         * @param       bool    $prefix_limit
         * @return      string
         */
        protected function _list_tables($prefix_limit = FALSE)
        {
                $sql = 'SELECT '.$this->escape_identifiers('TABLE_NAME').' FROM '.$this->escape_identifiers('_USER_TABLES');

                if ($prefix_limit === TRUE && $this->dbprefix !== '')
                {
                        $sql .= ' WHERE '.$this->escape_identifiers('TABLE_NAME')." LIKE '".$this->escape_like_str($this->dbprefix)."%' "
                                .sprintf($this->_like_escape_str, $this->_like_escape_chr);
                }

                return $sql;
        }

        // --------------------------------------------------------------------

        /**
         * Show column query
         *
         * Generates a platform-specific query string so that the column names can be fetched
         *
         * @param       string  $table
         * @return      string
         */
        protected function _list_columns($table = '')
        {
                return 'SELECT '.$this->escape_identifiers('COLUMN_NAME').' FROM '.$this->escape_identifiers('_USER_COLUMNS')
                        .' WHERE '.$this->escape_identifiers('TABLE_NAME').' = '.$this->escape($table);
        }

        // --------------------------------------------------------------------

        /**
         * Field data query
         *
         * Generates a platform-specific query so that the column data can be retrieved
         *
         * @param       string  $table
         * @return      string
         */
        protected function _field_data($table)
        {
                return 'SELECT * FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE).' LIMIT 1';
        }

        // --------------------------------------------------------------------

        /**
         * Update statement
         *
         * Generates a platform-specific update string from the supplied data
         *
         * @param       string  $table
         * @param       array   $values
         * @return      string
         */
        protected function _update($table, $values)
        {
                $this->qb_limit = FALSE;
                $this->qb_orderby = array();
                return parent::_update($table, $values);
        }

        // --------------------------------------------------------------------

        /**
         * Delete statement
         *
         * Generates a platform-specific delete string from the supplied data
         *
         * @param       string  $table
         * @return      string
         */
        protected function _delete($table)
        {
                $this->qb_limit = FALSE;
                return parent::_delete($table);
        }

        // --------------------------------------------------------------------

        /**
         * LIMIT
         *
         * Generates a platform-specific LIMIT clause
         *
         * @param       string  $sql    SQL Query
         * @return      string
         */
        protected function _limit($sql)
        {
                return $sql.' LIMIT '.$this->qb_limit.($this->qb_offset ? ' OFFSET '.$this->qb_offset : '');
        }

}