Subversion-Projekte lars-tiefland.ci

Revision

Revision 2242 | Revision 2257 | Zur aktuellen Revision | Blame | Vergleich mit vorheriger | Letzte Änderung | Log anzeigen | RSS feed

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017, 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 - 2017, 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 MySQL 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_mysql_driver extends CI_DB_pdo_driver {

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

        /**
         * Compression flag
         *
         * @var bool
         */
        public $compress = FALSE;

        /**
         * Strict ON flag
         *
         * Whether we're running in strict SQL mode.
         *
         * @var bool
         */
        public $stricton;

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

        /**
         * Identifier escape character
         *
         * @var string
         */
        protected $_escape_char = '`';

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

        /**
         * 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))
                {
                        $this->dsn = 'mysql:host='.(empty($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=', 6) === FALSE)
                {
                        $this->dsn .= ';charset='.$this->char_set;
                }
        }

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

        /**
         * Database connection
         *
         * @param       bool    $persistent
         * @return      object
         */
        public function db_connect($persistent = FALSE)
        {
                if (isset($this->stricton))
                {
                        if ($this->stricton)
                        {
                                $sql = 'CONCAT(@@sql_mode, ",", "STRICT_ALL_TABLES")';
                        }
                        else
                        {
                                $sql = 'REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(
                                        @@sql_mode,
                                        "STRICT_ALL_TABLES,", ""),
                                        ",STRICT_ALL_TABLES", ""),
                                        "STRICT_ALL_TABLES", ""),
                                        "STRICT_TRANS_TABLES,", ""),
                                        ",STRICT_TRANS_TABLES", ""),
                                        "STRICT_TRANS_TABLES", "")';
                        }

                        if ( ! empty($sql))
                        {
                                if (empty($this->options[PDO::MYSQL_ATTR_INIT_COMMAND]))
                                {
                                        $this->options[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET SESSION sql_mode = '.$sql;
                                }
                                else
                                {
                                        $this->options[PDO::MYSQL_ATTR_INIT_COMMAND] .= ', @@session.sql_mode = '.$sql;
                                }
                        }
                }

                if ($this->compress === TRUE)
                {
                        $this->options[PDO::MYSQL_ATTR_COMPRESS] = TRUE;
                }

                if (is_array($this->encrypt))
                {
                        $ssl = array();
                        empty($this->encrypt['ssl_key'])    OR $ssl[PDO::MYSQL_ATTR_SSL_KEY]    = $this->encrypt['ssl_key'];
                        empty($this->encrypt['ssl_cert'])   OR $ssl[PDO::MYSQL_ATTR_SSL_CERT]   = $this->encrypt['ssl_cert'];
                        empty($this->encrypt['ssl_ca'])     OR $ssl[PDO::MYSQL_ATTR_SSL_CA]     = $this->encrypt['ssl_ca'];
                        empty($this->encrypt['ssl_capath']) OR $ssl[PDO::MYSQL_ATTR_SSL_CAPATH] = $this->encrypt['ssl_capath'];
                        empty($this->encrypt['ssl_cipher']) OR $ssl[PDO::MYSQL_ATTR_SSL_CIPHER] = $this->encrypt['ssl_cipher'];

                        // DO NOT use array_merge() here!
                        // It re-indexes numeric keys and the PDO_MYSQL_ATTR_SSL_* constants are integers.
                        empty($ssl) OR $this->options += $ssl;
                }

                // Prior to version 5.7.3, MySQL silently downgrades to an unencrypted connection if SSL setup fails
                if (
                        ($pdo = parent::db_connect($persistent)) !== FALSE
                        && ! empty($ssl)
                        && version_compare($pdo->getAttribute(PDO::ATTR_CLIENT_VERSION), '5.7.3', '<=')
                        && empty($pdo->query("SHOW STATUS LIKE 'ssl_cipher'")->fetchObject()->Value)
                )
                {
                        $message = 'PDO_MYSQL was configured for an SSL connection, but got an unencrypted connection instead!';
                        log_message('error', $message);
                        return ($this->db_debug) ? $this->display_error($message, '', TRUE) : FALSE;
                }

                return $pdo;
        }

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

        /**
         * Select the database
         *
         * @param       string  $database
         * @return      bool
         */
        public function db_select($database = '')
        {
                if ($database === '')
                {
                        $database = $this->database;
                }

                if (FALSE !== $this->simple_query('USE '.$this->escape_identifiers($database)))
                {
                        $this->database = $database;
                        $this->data_cache = array();
                        return TRUE;
                }

                return FALSE;
        }

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

        /**
         * Begin Transaction
         *
         * @return      bool
         */
        protected function _trans_begin()
        {
                $this->conn_id->setAttribute(PDO::ATTR_AUTOCOMMIT, FALSE);
                return $this->conn_id->beginTransaction();
        }

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

        /**
         * Commit Transaction
         *
         * @return      bool
         */
        protected function _trans_commit()
        {
                if ($this->conn_id->commit())
                {
                        $this->conn_id->setAttribute(PDO::ATTR_AUTOCOMMIT, TRUE);
                        return TRUE;
                }

                return FALSE;
        }

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

        /**
         * Rollback Transaction
         *
         * @return      bool
         */
        protected function _trans_rollback()
        {
                if ($this->conn_id->rollBack())
                {
                        $this->conn_id->setAttribute(PDO::ATTR_AUTOCOMMIT, TRUE);
                        return TRUE;
                }

                return FALSE;
        }

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

        /**
         * 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 = 'SHOW TABLES';

                if ($prefix_limit === TRUE && $this->dbprefix !== '')
                {
                        return $sql." LIKE '".$this->escape_like_str($this->dbprefix)."%'";
                }

                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 'SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE);
        }

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

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

                $retval = array();
                for ($i = 0, $c = count($query); $i < $c; $i++)
                {
                        $retval[$i]                     = new stdClass();
                        $retval[$i]->name               = $query[$i]->Field;

                        sscanf($query[$i]->Type, '%[a-z](%d)',
                                $retval[$i]->type,
                                $retval[$i]->max_length
                        );

                        $retval[$i]->default            = $query[$i]->Default;
                        $retval[$i]->primary_key        = (int) ($query[$i]->Key === 'PRI');
                }

                return $retval;
        }

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

        /**
         * 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 'TRUNCATE '.$table;
        }

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

        /**
         * FROM tables
         *
         * Groups tables in FROM clauses if needed, so there is no confusion
         * about operator precedence.
         *
         * @return      string
         */
        protected function _from_tables()
        {
                if ( ! empty($this->qb_join) && count($this->qb_from) > 1)
                {
                        return '('.implode(', ', $this->qb_from).')';
                }

                return implode(', ', $this->qb_from);
        }

}