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
|
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* 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
*/
/**
* SQLite Forge Class
*
* @category Database
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
class CI_DB_sqlite_forge extends CI_DB_forge {
/**
* Create database
*
* @param string the database name
* @return bool
*/
public function create_database($db_name = '')
{
// In SQLite, a database is created when you connect to the database.
// We'll return TRUE so that an error isn't generated
return TRUE;
}
// --------------------------------------------------------------------
/**
* Drop database
*
* @param string the database name (ignored)
* @return bool
*/
public function drop_database($db_name = '')
{
if ( ! @file_exists($this->db->database) OR ! @unlink($this->db->database))
{
return ($this->db->db_debug) ? $this->db->display_error('db_unable_to_drop') : FALSE;
}
return TRUE;
}
// --------------------------------------------------------------------
/**
* Create Table
*
* @param string the table name
* @param array the fields
* @param mixed primary key(s)
* @param mixed key(s)
* @param bool should 'IF NOT EXISTS' be added to the SQL
* @return bool
*/
protected function _create_table($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->escape_identifiers($field).' '.$attributes['TYPE'];
empty($attributes['CONSTRAINT']) OR $sql .= '('.$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))
{
$sql .= ',';
}
}
if (count($primary_keys) > 0)
{
$sql .= ",\n\tPRIMARY KEY (".implode(', ', $this->db->protect_identifiers($primary_keys)).')';
}
if (is_array($keys) && count($keys) > 0)
{
foreach ($keys as $key)
{
$key = is_array($key)
? $this->db->protect_identifiers($key)
: array($this->db->escape_identifiers($key));
$sql .= ",\n\tUNIQUE (".implode(', ', $key).')';
}
}
return $sql."\n)";
}
// --------------------------------------------------------------------
/**
* Alter table query
*
* Generates a platform-specific query so that a table can be altered
* Called by add_column(), drop_column(), and column_alter(),
*
* @param string the ALTER type (ADD, DROP, CHANGE)
* @param string the column name
* @param string the table name
* @param string the column definition
* @param string the default value
* @param bool should 'NOT NULL' be added
* @param string the field after which we should add the new field
* @return string
*/
protected function _alter_table($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 '.$this->db->escape_identifiers($table).' '.$alter_type.' '.$this->db->escape_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');
}
}
/* End of file sqlite_forge.php */
/* Location: ./system/database/drivers/sqlite/sqlite_forge.php */
|
