1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
<?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 - 2014, 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');
/**
* SQLite3 Forge Class
*
* @category Database
* @author Andrey Andreev
* @link http://codeigniter.com/user_guide/database/
*/
class CI_DB_sqlite3_forge extends CI_DB_forge {
/**
* UNSIGNED support
*
* @var bool|array
*/
protected $_unsigned = FALSE;
/**
* 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(), '3.3', '<'))
{
$this->create_table_if = FALSE;
}
}
// --------------------------------------------------------------------
/**
* Create database
*
* @param string $db_name
* @return bool
*/
public function create_database($db_name = '')
{
// 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 $db_name (ignored)
* @return bool
*/
public function drop_database($db_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 ? $this->db->display_error('db_unable_to_drop') : FALSE;
}
elseif ( ! empty($this->db->data_cache['db_names']))
{
$key = array_search(strtolower($this->db->database), array_map('strtolower', $this->db->data_cache['db_names']), TRUE);
if ($key !== FALSE)
{
unset($this->db->data_cache['db_names'][$key]);
}
}
return TRUE;
}
return $this->db->db_debug ? $this->db->display_error('db_unable_to_drop') : FALSE;
}
// --------------------------------------------------------------------
/**
* ALTER TABLE
*
* @todo implement drop_column(), modify_column()
* @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' OR $alter_type === 'CHANGE')
{
// drop_column():
// BEGIN TRANSACTION;
// CREATE TEMPORARY TABLE t1_backup(a,b);
// INSERT INTO t1_backup SELECT a,b FROM t1;
// DROP TABLE t1;
// CREATE TABLE t1(a,b);
// INSERT INTO t1 SELECT a,b FROM t1_backup;
// DROP TABLE t1_backup;
// COMMIT;
return FALSE;
}
return parent::_alter_table($alter_type, $table, $field);
}
// --------------------------------------------------------------------
/**
* Process column
*
* @param array $field
* @return string
*/
protected function _process_column($field)
{
return $this->db->escape_identifiers($field['name'])
.' '.$field['type']
.$field['auto_increment']
.$field['null']
.$field['unique']
.$field['default'];
}
// --------------------------------------------------------------------
/**
* Field attribute TYPE
*
* Performs a data type mapping between different databases.
*
* @param array &$attributes
* @return void
*/
protected function _attr_type(&$attributes)
{
switch (strtoupper($attributes['TYPE']))
{
case 'ENUM':
case 'SET':
$attributes['TYPE'] = 'TEXT';
return;
default: return;
}
}
// --------------------------------------------------------------------
/**
* Field attribute AUTO_INCREMENT
*
* @param array &$attributes
* @param array &$field
* @return void
*/
protected function _attr_auto_increment(&$attributes, &$field)
{
if ( ! empty($attributes['AUTO_INCREMENT']) && $attributes['AUTO_INCREMENT'] === TRUE && stripos($field['type'], 'int') !== FALSE)
{
$field['type'] = 'INTEGER PRIMARY KEY';
$field['default'] = '';
$field['null'] = '';
$field['unique'] = '';
$field['auto_increment'] = ' AUTOINCREMENT';
$this->primary_keys = array();
}
}
}
/* End of file sqlite3_forge.php */
/* Location: ./system/database/drivers/sqlite3/sqlite3_forge.php */
|
