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✏️ Editing: postgre_forge.php

<?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 1.3.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Postgre Forge Class
 *
 * @package		CodeIgniter
 * @subpackage	Drivers
 * @category	Database
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_postgre_forge extends CI_DB_forge {

/**
	 * UNSIGNED support
	 *
	 * @var	array
	 */
	protected $_unsigned		= array(
		'INT2'		=> 'INTEGER',
		'SMALLINT'	=> 'INTEGER',
		'INT'		=> 'BIGINT',
		'INT4'		=> 'BIGINT',
		'INTEGER'	=> 'BIGINT',
		'INT8'		=> 'NUMERIC',
		'BIGINT'	=> 'NUMERIC',
		'REAL'		=> 'DOUBLE PRECISION',
		'FLOAT'		=> 'DOUBLE PRECISION'
	);

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

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

/**
	 * Class constructor
	 *
	 * @param	object	&$db	Database object
	 * @return	void
	 */
	public function __construct(&$db)
	{
		parent::__construct($db);

if (version_compare($this->db->version(), '9.0', '>'))
		{
			$this->create_table_if = 'CREATE TABLE IF NOT EXISTS';
		}
	}

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

/**
	 * 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, $field)
 	{
		if (in_array($alter_type, array('DROP', 'ADD'), TRUE))
		{
			return parent::_alter_table($alter_type, $table, $field);
		}

$sql = 'ALTER TABLE '.$this->db->escape_identifiers($table);
		$sqls = array();
		for ($i = 0, $c = count($field); $i < $c; $i++)
		{
			if ($field[$i]['_literal'] !== FALSE)
			{
				return FALSE;
			}

if (version_compare($this->db->version(), '8', '>=') && isset($field[$i]['type']))
			{
				$sqls[] = $sql.' ALTER COLUMN '.$this->db->escape_identifiers($field[$i]['name'])
					.' TYPE '.$field[$i]['type'].$field[$i]['length'];
			}

if ( ! empty($field[$i]['default']))
			{
				$sqls[] = $sql.' ALTER COLUMN '.$this->db->escape_identifiers($field[$i]['name'])
					.' SET DEFAULT '.$field[$i]['default'];
			}

if (isset($field[$i]['null']))
			{
				$sqls[] = $sql.' ALTER COLUMN '.$this->db->escape_identifiers($field[$i]['name'])
					.($field[$i]['null'] === TRUE ? ' DROP NOT NULL' : ' SET NOT NULL');
			}

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

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'];
			}
		}

return $sqls;
 	}

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

/**
	 * Field attribute TYPE
	 *
	 * Performs a data type mapping between different databases.
	 *
	 * @param	array	&$attributes
	 * @return	void
	 */
	protected function _attr_type(&$attributes)
	{
		// Reset field lenghts for data types that don't support it
		if (isset($attributes['CONSTRAINT']) && stripos($attributes['TYPE'], 'int') !== FALSE)
		{
			$attributes['CONSTRAINT'] = NULL;
		}

switch (strtoupper($attributes['TYPE']))
		{
			case 'TINYINT':
				$attributes['TYPE'] = 'SMALLINT';
				$attributes['UNSIGNED'] = FALSE;
				return;
			case 'MEDIUMINT':
				$attributes['TYPE'] = 'INTEGER';
				$attributes['UNSIGNED'] = FALSE;
				return;
			default: return;
		}
	}

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

/**
	 * Field attribute AUTO_INCREMENT
	 *
	 * @param	array	&$attributes
	 * @param	array	&$field
	 * @return	void
	 */
	protected function _attr_auto_increment(&$attributes, &$field)
	{
		if ( ! empty($attributes['AUTO_INCREMENT']) && $attributes['AUTO_INCREMENT'] === TRUE)
		{
			$field['type'] = ($field['type'] === 'NUMERIC')
				? 'BIGSERIAL'
				: 'SERIAL';
		}
	}

}

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