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1 | <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); |
2 | /** | |
3 | * CodeIgniter | |
4 | * | |
5 | * An open source application development framework for PHP 5.1.6 or newer | |
6 | * | |
7 | * @package CodeIgniter | |
8 | * @author ExpressionEngine Dev Team | |
9 | * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. | |
10 | * @license http://codeigniter.com/user_guide/license.html | |
11 | * @link http://codeigniter.com | |
12 | * @since Version 1.0 | |
13 | * @filesource | |
14 | */ | |
15 | ||
16 | // ------------------------------------------------------------------------ | |
17 | ||
18 | /** | |
19 | * SQLite Forge Class | |
20 | * | |
21 | * @category Database | |
22 | * @author ExpressionEngine Dev Team | |
23 | * @link http://codeigniter.com/user_guide/database/ | |
24 | */ | |
25 | class CI_DB_sqlite_forge extends CI_DB_forge { | |
26 | ||
27 | /** | |
28 | * Create database | |
29 | * | |
30 | * @access public | |
31 | * @param string the database name | |
32 | * @return bool | |
33 | */ | |
34 | function _create_database() | |
35 | { | |
36 | // In SQLite, a database is created when you connect to the database. | |
37 | // We'll return TRUE so that an error isn't generated | |
38 | return TRUE; | |
39 | } | |
40 | ||
41 | // -------------------------------------------------------------------- | |
42 | ||
43 | /** | |
44 | * Drop database | |
45 | * | |
46 | * @access private | |
47 | * @param string the database name | |
48 | * @return bool | |
49 | */ | |
50 | function _drop_database($name) | |
51 | { | |
52 | if ( ! @file_exists($this->db->database) OR ! @unlink($this->db->database)) | |
53 | { | |
54 | if ($this->db->db_debug) | |
55 | { | |
56 | return $this->db->display_error('db_unable_to_drop'); | |
57 | } | |
58 | return FALSE; | |
59 | } | |
60 | return TRUE; | |
61 | } | |
62 | // -------------------------------------------------------------------- | |
63 | ||
64 | /** | |
65 | * Create Table | |
66 | * | |
67 | * @access private | |
68 | * @param string the table name | |
69 | * @param array the fields | |
70 | * @param mixed primary key(s) | |
71 | * @param mixed key(s) | |
72 | * @param boolean should 'IF NOT EXISTS' be added to the SQL | |
73 | * @return bool | |
74 | */ | |
75 | function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists) | |
76 | { | |
77 | $sql = 'CREATE TABLE '; | |
78 | ||
79 | // IF NOT EXISTS added to SQLite in 3.3.0 | |
80 | if ($if_not_exists === TRUE && version_compare($this->db->_version(), '3.3.0', '>=') === TRUE) | |
81 | { | |
82 | $sql .= 'IF NOT EXISTS '; | |
83 | } | |
84 | ||
85 | $sql .= $this->db->_escape_identifiers($table)."("; | |
86 | $current_field_count = 0; | |
87 | ||
88 | foreach ($fields as $field=>$attributes) | |
89 | { | |
90 | // Numeric field names aren't allowed in databases, so if the key is | |
91 | // numeric, we know it was assigned by PHP and the developer manually | |
92 | // entered the field information, so we'll simply add it to the list | |
93 | if (is_numeric($field)) | |
94 | { | |
95 | $sql .= "\n\t$attributes"; | |
96 | } | |
97 | else | |
98 | { | |
99 | $attributes = array_change_key_case($attributes, CASE_UPPER); | |
100 | ||
101 | $sql .= "\n\t".$this->db->_protect_identifiers($field); | |
102 | ||
103 | $sql .= ' '.$attributes['TYPE']; | |
104 | ||
105 | if (array_key_exists('CONSTRAINT', $attributes)) | |
106 | { | |
107 | $sql .= '('.$attributes['CONSTRAINT'].')'; | |
108 | } | |
109 | ||
110 | if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE) | |
111 | { | |
112 | $sql .= ' UNSIGNED'; | |
113 | } | |
114 | ||
115 | if (array_key_exists('DEFAULT', $attributes)) | |
116 | { | |
117 | $sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\''; | |
118 | } | |
119 | ||
120 | if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE) | |
121 | { | |
122 | $sql .= ' NULL'; | |
123 | } | |
124 | else | |
125 | { | |
126 | $sql .= ' NOT NULL'; | |
127 | } | |
128 | ||
129 | if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE) | |
130 | { | |
131 | $sql .= ' AUTO_INCREMENT'; | |
132 | } | |
133 | } | |
134 | ||
135 | // don't add a comma on the end of the last field | |
136 | if (++$current_field_count < count($fields)) | |
137 | { | |
138 | $sql .= ','; | |
139 | } | |
140 | } | |
141 | ||
142 | if (count($primary_keys) > 0) | |
143 | { | |
144 | $primary_keys = $this->db->_protect_identifiers($primary_keys); | |
145 | $sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")"; | |
146 | } | |
147 | ||
148 | if (is_array($keys) && count($keys) > 0) | |
149 | { | |
150 | foreach ($keys as $key) | |
151 | { | |
152 | if (is_array($key)) | |
153 | { | |
154 | $key = $this->db->_protect_identifiers($key); | |
155 | } | |
156 | else | |
157 | { | |
158 | $key = array($this->db->_protect_identifiers($key)); | |
159 | } | |
160 | ||
161 | $sql .= ",\n\tUNIQUE (" . implode(', ', $key) . ")"; | |
162 | } | |
163 | } | |
164 | ||
165 | $sql .= "\n)"; | |
166 | ||
167 | return $sql; | |
168 | } | |
169 | ||
170 | // -------------------------------------------------------------------- | |
171 | ||
172 | /** | |
173 | * Drop Table | |
174 | * | |
175 | * Unsupported feature in SQLite | |
176 | * | |
177 | * @access private | |
178 | * @return bool | |
179 | */ | |
180 | function _drop_table($table) | |
181 | { | |
182 | if ($this->db->db_debug) | |
183 | { | |
184 | return $this->db->display_error('db_unsuported_feature'); | |
185 | } | |
186 | return array(); | |
187 | } | |
188 | ||
189 | // -------------------------------------------------------------------- | |
190 | ||
191 | /** | |
192 | * Alter table query | |
193 | * | |
194 | * Generates a platform-specific query so that a table can be altered | |
195 | * Called by add_column(), drop_column(), and column_alter(), | |
196 | * | |
197 | * @access private | |
198 | * @param string the ALTER type (ADD, DROP, CHANGE) | |
199 | * @param string the column name | |
200 | * @param string the table name | |
201 | * @param string the column definition | |
202 | * @param string the default value | |
203 | * @param boolean should 'NOT NULL' be added | |
204 | * @param string the field after which we should add the new field | |
205 | * @return object | |
206 | */ | |
207 | function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '') | |
208 | { | |
209 | $sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ".$this->db->_protect_identifiers($column_name); | |
210 | ||
211 | // DROP has everything it needs now. | |
212 | if ($alter_type == 'DROP') | |
213 | { | |
214 | // SQLite does not support dropping columns | |
215 | // http://www.sqlite.org/omitted.html | |
216 | // http://www.sqlite.org/faq.html#q11 | |
217 | return FALSE; | |
218 | } | |
219 | ||
220 | $sql .= " $column_definition"; | |
221 | ||
222 | if ($default_value != '') | |
223 | { | |
224 | $sql .= " DEFAULT \"$default_value\""; | |
225 | } | |
226 | ||
227 | if ($null === NULL) | |
228 | { | |
229 | $sql .= ' NULL'; | |
230 | } | |
231 | else | |
232 | { | |
233 | $sql .= ' NOT NULL'; | |
234 | } | |
235 | ||
236 | if ($after_field != '') | |
237 | { | |
238 | $sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field); | |
239 | } | |
240 | ||
241 | return $sql; | |
242 | ||
243 | } | |
244 | ||
245 | // -------------------------------------------------------------------- | |
246 | ||
247 | /** | |
248 | * Rename a table | |
249 | * | |
250 | * Generates a platform-specific query so that a table can be renamed | |
251 | * | |
252 | * @access private | |
253 | * @param string the old table name | |
254 | * @param string the new table name | |
255 | * @return string | |
256 | */ | |
257 | function _rename_table($table_name, $new_table_name) | |
258 | { | |
259 | $sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name); | |
260 | return $sql; | |
261 | } | |
262 | } | |
263 | ||
264 | /* End of file sqlite_forge.php */ | |
265 | /* Location: ./system/database/drivers/sqlite/sqlite_forge.php */ |