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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 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
*/
/**
* SQLite3 Forge Class
*
* @category Database
* @author Andrey Andreev
* @link http://codeigniter.com/user_guide/database/
*/
class CI_DB_sqlite3_forge extends CI_DB_forge {
/**
* Create database
*
* @param string the database name
* @return bool
*/
public function _create_database()
{
// In SQLite, a database is created when you connect to the database.
// We'll return TRUE so that an error isn't generated
return TRUE;
}
// --------------------------------------------------------------------
/**
* Drop database
*
* @param string the database name
* @return bool
*/
public function _drop_database($name)
{
// In SQLite, a database is dropped when we delete a file
if (@file_exists($this->db->database))
{
// We need to close the pseudo-connection first
$this->db->close();
if ( ! @unlink($this->db->database))
{
return $this->db->db_debug ? $this->db->display_error('db_unable_to_drop') : FALSE;
}
return TRUE;
}
return $this->db->db_debug ? $this->db->display_error('db_unable_to_drop') : FALSE;
}
// --------------------------------------------------------------------
/**
* Create Table
*
* @param string the table name
* @param array the fields
* @param mixed primary key(s)
* @param mixed key(s)
* @param bool should 'IF NOT EXISTS' be added to the SQL
* @return bool
*/
public function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
{
$sql = 'CREATE TABLE ';
// IF NOT EXISTS added to SQLite in 3.3.0
if ($if_not_exists === TRUE && version_compare($this->db->version(), '3.3.0', '>=') === TRUE)
{
$sql .= 'IF NOT EXISTS ';
}
$sql .= $this->db->_escape_identifiers($table).'(';
$current_field_count = 0;
foreach ($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->protect_identifiers($field)
.' '.$attributes['TYPE']
.( ! empty($attributes['CONSTRAINT']) ? '('.$attributes['CONSTRAINT'].')' : '')
.(( ! empty($attributes['UNSIGNED']) && $attributes['UNSIGNED'] === TRUE) ? ' UNSIGNED' : '')
.(isset($attributes['DEFAULT']) ? ' DEFAULT \''.$attributes['DEFAULT'].'\'' : '')
.(( ! empty($attributes['NULL']) && $attributes['NULL'] === TRUE) ? ' NULL' : ' NOT NULL')
.(( ! empty($attributes['AUTO_INCREMENT']) && $attributes['AUTO_INCREMENT'] === TRUE) ? ' AUTO_INCREMENT' : '');
}
// don't add a comma on the end of the last field
if (++$current_field_count < count($fields))
{
$sql .= ',';
}
}
if (count($primary_keys) > 0)
{
$primary_keys = $this->db->protect_identifiers($primary_keys);
$sql .= ",\n\tPRIMARY KEY (".implode(', ', $primary_keys).')';
}
if (is_array($keys) && count($keys) > 0)
{
foreach ($keys as $key)
{
if (is_array($key))
{
$key = $this->db->protect_identifiers($key);
}
else
{
$key = array($this->db->protect_identifiers($key));
}
$sql .= ",\n\tUNIQUE (".implode(', ', $key).')';
}
}
return $sql."\n)";
}
// --------------------------------------------------------------------
/**
* Drop Table
*
* @param string the table name
* @return string
*/
public function _drop_table($table)
{
return 'DROP TABLE '.$table.' IF EXISTS';
}
// --------------------------------------------------------------------
/**
* Alter table query
*
* Generates a platform-specific query so that a table can be altered
* Called by add_column(), drop_column(), and column_alter(),
*
* @param string the ALTER type (ADD, DROP, CHANGE)
* @param string the column name
* @param string the table name
* @param string the column definition
* @param string the default value
* @param bool should 'NOT NULL' be added
* @param string the field after which we should add the new field
* @return string
*/
public function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')
{
/* SQLite only supports adding new columns and it does
* NOT support the AFTER statement. Each new column will
* be added as the last one in the table.
*/
if ($alter_type !== 'ADD COLUMN')
{
// Not supported
return FALSE;
}
return 'ALTER TABLE '.$this->db->protect_identifiers($table).' '.$alter_type.' '.$this->db->protect_identifiers($column_name)
.' '.$column_definition
.($default_value != '' ? ' DEFAULT '.$default_value : '')
// If NOT NULL is specified, the field must have a DEFAULT value other than NULL
.(($null !== NULL && $default_value !== 'NULL') ? ' NOT NULL' : ' NULL');
}
// --------------------------------------------------------------------
/**
* Rename a table
*
* Generates a platform-specific query so that a table can be renamed
*
* @param string the old table name
* @param string the new table name
* @return string
*/
public function _rename_table($table_name, $new_table_name)
{
return 'ALTER TABLE '.$this->db->protect_identifiers($table_name).' RENAME TO '.$this->db->protect_identifiers($new_table_name);
}
}
/* End of file sqlite3_forge.php */
/* Location: ./system/database/drivers/sqlite3/sqlite3_forge.php */
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