bcit-ci/CodeIgniter

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2019 - 2022, CodeIgniter Foundation
 *
 * 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/)
 * @copyright    Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
 * @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/userguide3/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 : '');
    }

}