Subversion-Projekte lars-tiefland.ci

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2018, 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 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
 * @license     http://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 SQLite 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_sqlite_driver extends CI_DB_pdo_driver {

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

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

        /**
         * ORDER BY random keyword
         *
         * @var array
         */
        protected $_random_keyword = array('RANDOM()', 'RANDOM()');

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

        /**
         * 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 = 'sqlite:';

                        if (empty($this->database) && empty($this->hostname))
                        {
                                $this->database = ':memory:';
                        }

                        $this->database = empty($this->database) ? $this->hostname : $this->database;
                }
        }

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

        /**
         * 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 "NAME" FROM "SQLITE_MASTER" WHERE "TYPE" = \'table\'';

                if ($prefix_limit === TRUE && $this->dbprefix !== '')
                {
                        return $sql.' AND "NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' "
                                .sprintf($this->_like_escape_str, $this->_like_escape_chr);
                }

                return $sql;
        }

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

        /**
         * Fetch Field Names
         *
         * @param       string  $table  Table name
         * @return      array
         */
        public function list_fields($table)
        {
                // Is there a cached result?
                if (isset($this->data_cache['field_names'][$table]))
                {
                        return $this->data_cache['field_names'][$table];
                }

                if (($result = $this->query('PRAGMA TABLE_INFO('.$this->protect_identifiers($table, TRUE, NULL, FALSE).')')) === FALSE)
                {
                        return FALSE;
                }

                $this->data_cache['field_names'][$table] = array();
                foreach ($result->result_array() as $row)
                {
                        $this->data_cache['field_names'][$table][] = $row['name'];
                }

                return $this->data_cache['field_names'][$table];
        }

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

        /**
         * Returns an object with field data
         *
         * @param       string  $table
         * @return      array
         */
        public function field_data($table)
        {
                if (($query = $this->query('PRAGMA TABLE_INFO('.$this->protect_identifiers($table, TRUE, NULL, FALSE).')')) === FALSE)
                {
                        return FALSE;
                }

                $query = $query->result_array();
                if (empty($query))
                {
                        return FALSE;
                }

                $retval = array();
                for ($i = 0, $c = count($query); $i < $c; $i++)
                {
                        $retval[$i]                     = new stdClass();
                        $retval[$i]->name               = $query[$i]['name'];
                        $retval[$i]->type               = $query[$i]['type'];
                        $retval[$i]->max_length         = NULL;
                        $retval[$i]->default            = $query[$i]['dflt_value'];
                        $retval[$i]->primary_key        = isset($query[$i]['pk']) ? (int) $query[$i]['pk'] : 0;
                }

                return $retval;
        }

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

        /**
         * Replace statement
         *
         * @param       string  $table  Table name
         * @param       array   $keys   INSERT keys
         * @param       array   $values INSERT values
         * @return      string
         */
        protected function _replace($table, $keys, $values)
        {
                return 'INSERT OR '.parent::_replace($table, $keys, $values);
        }

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

        /**
         * Truncate statement
         *
         * Generates a platform-specific truncate string from the supplied data
         *
         * If the database does not support the TRUNCATE statement,
         * then this method maps to 'DELETE FROM table'
         *
         * @param       string  $table
         * @return      string
         */
        protected function _truncate($table)
        {
                return 'DELETE FROM '.$table;
        }

}