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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';
// --------------------------------------------------------------------
/**
* Process Fields
*
* @param mixed $fields
* @return string
*/
protected function _process_fields($fields)
{
$current_field_count = 0;
$sql = '';
foreach ($fields as $field => $attributes)
{
// Numeric field names aren't allowed in databases, so if the key is
// numeric, we know it was assigned by PHP and the developer manually
// entered the field information, so we'll simply add it to the list
if (is_numeric($field))
{
$sql .= "\n\t".$attributes;
}
else
{
$attributes = array_change_key_case($attributes, CASE_UPPER);
$sql .= "\n\t".$this->db->escape_identifiers($field);
empty($attributes['NAME']) OR $sql .= ' '.$this->db->escape_identifiers($attributes['NAME']).' ';
if ( ! empty($attributes['TYPE']))
{
$sql .= ' '.$attributes['TYPE'];
if ( ! empty($attributes['CONSTRAINT']))
{
switch (strtolower($attributes['TYPE']))
{
case 'decimal':
case 'float':
case 'numeric':
$sql .= '('.implode(',', $attributes['CONSTRAINT']).')';
break;
case 'enum':
case 'set':
$sql .= '("'.implode('","', $attributes['CONSTRAINT']).'")';
break;
default:
$sql .= '('.$attributes['CONSTRAINT'].')';
}
}
}
if ( ! empty($attributes['UNSIGNED']) && $attributes['UNSIGNED'] === TRUE)
{
$sql .= ' UNSIGNED';
}
if (isset($attributes['DEFAULT']))
{
$sql .= " DEFAULT '".$attributes['DEFAULT']."'";
}
$sql .= ( ! empty($attributes['NULL']) && $attributes['NULL'] === TRUE)
? ' NULL' : ' NOT NULL';
if ( ! empty($attributes['AUTO_INCREMENT']) && $attributes['AUTO_INCREMENT'] === TRUE)
{
$sql .= ' AUTO_INCREMENT';
}
}
// don't add a comma on the end of the last field
if (++$current_field_count < count($fields))
{
$sql .= ',';
}
}
return $sql;
}
// --------------------------------------------------------------------
/**
* Create Table
*
* @param string the table name
* @param mixed the fields
* @param mixed primary key(s)
* @param mixed key(s)
* @param bool should 'IF NOT EXISTS' be added to the SQL
* @return bool
*/
protected function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
{
$sql = 'CREATE TABLE ';
if ($if_not_exists === TRUE)
{
$sql .= 'IF NOT EXISTS ';
}
$sql .= $this->db->escape_identifiers($table).' ('.$this->_process_fields($fields);
if (count($primary_keys) > 0)
{
$key_name = $this->db->escape_identifiers(implode('_', $primary_keys));
$sql .= ",\n\tPRIMARY KEY ".$key_name.' ('.implode(', ', $this->db->escape_identifiers($primary_keys)).')';
}
if (is_array($keys) && count($keys) > 0)
{
foreach ($keys as $key)
{
if (is_array($key))
{
$key_name = $this->db->escape_identifiers(implode('_', $key));
$key = $this->db->escape_identifiers($key);
}
else
{
$key_name = $this->db->escape_identifiers($key);
$key = array($key_name);
}
$sql .= ",\n\tKEY ".$key_name.' ('.implode(', ', $key).')';
}
}
return $sql."\n) DEFAULT CHARACTER SET ".$this->db->char_set.' COLLATE '.$this->db->dbcollat.';';
}
// --------------------------------------------------------------------
/**
* Alter table query
*
* Generates a platform-specific query so that a table can be altered
* Called by add_column(), drop_column() and column_alter()
*
* @param string the ALTER type (ADD, DROP, CHANGE)
* @param string the column name
* @param array fields
* @param string the field after which we should add the new field
* @return string
*/
protected function _alter_table($alter_type, $table, $fields, $after_field = '')
{
$sql = 'ALTER TABLE '.$this->db->escape_identifiers($table).' '.$alter_type.' ';
// DROP has everything it needs now.
if ($alter_type === 'DROP')
{
return $sql.$this->db->escape_identifiers($fields);
}
return $sql.$this->_process_fields($fields)
.($after_field !== '' ? ' AFTER '.$this->db->escape_identifiers($after_field) : '');
}
}
/* End of file mysql_forge.php */
/* Location: ./system/database/drivers/mysql/mysql_forge.php */
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