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 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * MySQL Forge Class
 *
 * @category    Database
 * @author              EllisLab Dev Team
 * @link                https://codeigniter.com/user_guide/database/
 */
class CI_DB_mysql_forge extends CI_DB_forge {

        /**
         * CREATE DATABASE statement
         *
         * @var string
         */
        protected $_create_database     = 'CREATE DATABASE %s CHARACTER SET %s COLLATE %s';

        /**
         * CREATE TABLE keys flag
         *
         * Whether table keys are created from within the
         * CREATE TABLE statement.
         *
         * @var bool
         */
        protected $_create_table_keys   = TRUE;

        /**
         * UNSIGNED support
         *
         * @var array
         */
        protected $_unsigned            = array(
                'TINYINT',
                'SMALLINT',
                'MEDIUMINT',
                'INT',
                'INTEGER',
                'BIGINT',
                'REAL',
                'DOUBLE',
                'DOUBLE PRECISION',
                'FLOAT',
                'DECIMAL',
                'NUMERIC'
        );

        /**
         * NULL value representation in CREATE/ALTER TABLE statements
         *
         * @var string
         */
        protected $_null = 'NULL';

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

        /**
         * CREATE TABLE attributes
         *
         * @param       array   $attributes     Associative array of table attributes
         * @return      string
         */
        protected function _create_table_attr($attributes)
        {
                $sql = '';

                foreach (array_keys($attributes) as $key)
                {
                        if (is_string($key))
                        {
                                $sql .= ' '.strtoupper($key).' = '.$attributes[$key];
                        }
                }

                if ( ! empty($this->db->char_set) && ! strpos($sql, 'CHARACTER SET') && ! strpos($sql, 'CHARSET'))
                {
                        $sql .= ' DEFAULT CHARACTER SET = '.$this->db->char_set;
                }

                if ( ! empty($this->db->dbcollat) && ! strpos($sql, 'COLLATE'))
                {
                        $sql .= ' COLLATE = '.$this->db->dbcollat;
                }

                return $sql;
        }

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

        /**
         * ALTER TABLE
         *
         * @param       string  $alter_type     ALTER type
         * @param       string  $table          Table name
         * @param       mixed   $field          Column definition
         * @return      string|string[]
         */
        protected function _alter_table($alter_type, $table, $field)
        {
                if ($alter_type === 'DROP')
                {
                        return parent::_alter_table($alter_type, $table, $field);
                }

                $sql = 'ALTER TABLE '.$this->db->escape_identifiers($table);
                for ($i = 0, $c = count($field); $i < $c; $i++)
                {
                        if ($field[$i]['_literal'] !== FALSE)
                        {
                                $field[$i] = ($alter_type === 'ADD')
                                                ? "\n\tADD ".$field[$i]['_literal']
                                                : "\n\tMODIFY ".$field[$i]['_literal'];
                        }
                        else
                        {
                                if ($alter_type === 'ADD')
                                {
                                        $field[$i]['_literal'] = "\n\tADD ";
                                }
                                else
                                {
                                        $field[$i]['_literal'] = empty($field[$i]['new_name']) ? "\n\tMODIFY " : "\n\tCHANGE ";
                                }

                                $field[$i] = $field[$i]['_literal'].$this->_process_column($field[$i]);
                        }
                }

                return array($sql.implode(',', $field));
        }

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

        /**
         * Process column
         *
         * @param       array   $field
         * @return      string
         */
        protected function _process_column($field)
        {
                $extra_clause = isset($field['after'])
                        ? ' AFTER '.$this->db->escape_identifiers($field['after']) : '';

                if (empty($extra_clause) && isset($field['first']) && $field['first'] === TRUE)
                {
                        $extra_clause = ' FIRST';
                }


                return $this->db->escape_identifiers($field['name'])
                        .(empty($field['new_name']) ? '' : ' '.$this->db->escape_identifiers($field['new_name']))
                        .' '.$field['type'].$field['length']
                        .$field['unsigned']
                        .$field['null']
                        .$field['default']
                        .$field['auto_increment']
                        .$field['unique']
                        .(empty($field['comment']) ? '' : ' COMMENT '.$field['comment'])
                        .$extra_clause;
        }

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

        /**
         * Process indexes
         *
         * @param       string  $table  (ignored)
         * @return      string
         */
        protected function _process_indexes($table)
        {
                $sql = '';

                for ($i = 0, $c = count($this->keys); $i < $c; $i++)
                {
                        if (is_array($this->keys[$i]))
                        {
                                for ($i2 = 0, $c2 = count($this->keys[$i]); $i2 < $c2; $i2++)
                                {
                                        if ( ! isset($this->fields[$this->keys[$i][$i2]]))
                                        {
                                                unset($this->keys[$i][$i2]);
                                                continue;
                                        }
                                }
                        }
                        elseif ( ! isset($this->fields[$this->keys[$i]]))
                        {
                                unset($this->keys[$i]);
                                continue;
                        }

                        is_array($this->keys[$i]) OR $this->keys[$i] = array($this->keys[$i]);

                        $sql .= ",\n\tKEY ".$this->db->escape_identifiers(implode('_', $this->keys[$i]))
                                .' ('.implode(', ', $this->db->escape_identifiers($this->keys[$i])).')';
                }

                $this->keys = array();

                return $sql;
        }

}