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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* MySQL Forge Class
*
* @category Database
* @author EllisLab Dev Team
* @link http://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 $_null = 'NULL';
// --------------------------------------------------------------------
/**
* Class constructor
*
* @param object &$db Database object
* @return void
*/
public function __construct(&$db)
{
parent::__construct($db);
$this->_create_table .= ' DEFAULT CHARSET '.$this->db->char_set.' COLLATE '.$this->db->dbcollat;
}
// --------------------------------------------------------------------
/**
* 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']
.$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;
}
}
/* End of file mysql_forge.php */
/* Location: ./system/database/drivers/mysql/mysql_forge.php */
|
