<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2015, 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. (http://ellislab.com/)
* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link http://codeigniter.com
* @since Version 3.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');

/**
* PDO Oracle Forge Class
*
* @category Database
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
class CI_DB_pdo_oci_forge extends CI_DB_pdo_forge {

/**
* CREATE DATABASE statement
*
* @var string
*/
protected $_create_database = FALSE;

/**
* DROP DATABASE statement
*
* @var string
*/
protected $_drop_database = FALSE;

/**
* CREATE TABLE IF statement
*
* @var string
*/
protected $_create_table_if = 'CREATE TABLE IF NOT EXISTS';

/**
* UNSIGNED support
*
* @var bool|array
*/
protected $_unsigned = FALSE;

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

/**
* 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, $field);
}
elseif ($alter_type === 'CHANGE')
{
$alter_type = 'MODIFY';
}

$sql = 'ALTER TABLE '.$this->db->escape_identifiers($table);
$sqls = array();
for ($i = 0, $c = count($field); $i < $c; $i++)
{
if ($field[$i]['_literal'] !== FALSE)
{
$field[$i] = "\n\t".$field[$i]['_literal'];
}
else
{
$field[$i]['_literal'] = "\n\t".$this->_process_column($field[$i]);

if ( ! empty($field[$i]['comment']))
{
$sqls[] = 'COMMENT ON COLUMN '
.$this->db->escape_identifiers($table).'.'.$this->db->escape_identifiers($field[$i]['name'])
.' IS '.$field[$i]['comment'];
}

if ($alter_type === 'MODIFY' && ! empty($field[$i]['new_name']))
{
$sqls[] = $sql.' RENAME COLUMN '.$this->db->escape_identifiers($field[$i]['name'])
.' '.$this->db->escape_identifiers($field[$i]['new_name']);
}
}
}

$sql .= ' '.$alter_type.' ';
$sql .= (count($field) === 1)
? $field[0]
: '('.implode(',', $field).')';

// RENAME COLUMN must be executed after MODIFY
array_unshift($sqls, $sql);
return $sql;
}

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

/**
* Field attribute AUTO_INCREMENT
*
* @param array &$attributes
* @param array &$field
* @return void
*/
protected function _attr_auto_increment(&$attributes, &$field)
{
// Not supported - sequences and triggers must be used instead
}

}