source: trunk/forum/includes/db/sqlite.php

Last change on this file was 400, checked in by george, 17 years ago
  • Přidáno: Nové forum phpBB 3.
File size: 7.3 KB
Line 
1<?php
2/**
3*
4* @package dbal
5* @version $Id: sqlite.php 8814 2008-09-04 12:01:47Z acydburn $
6* @copyright (c) 2005 phpBB Group
7* @license http://opensource.org/licenses/gpl-license.php GNU Public License
8*
9*/
10
11/**
12* @ignore
13*/
14if (!defined('IN_PHPBB'))
15{
16 exit;
17}
18
19include_once($phpbb_root_path . 'includes/db/dbal.' . $phpEx);
20
21/**
22* Sqlite Database Abstraction Layer
23* Minimum Requirement: 2.8.2+
24* @package dbal
25*/
26class dbal_sqlite extends dbal
27{
28 /**
29 * Connect to server
30 */
31 function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
32 {
33 $this->persistency = $persistency;
34 $this->user = $sqluser;
35 $this->server = $sqlserver . (($port) ? ':' . $port : '');
36 $this->dbname = $database;
37
38 $error = '';
39 $this->db_connect_id = ($this->persistency) ? @sqlite_popen($this->server, 0666, $error) : @sqlite_open($this->server, 0666, $error);
40
41 if ($this->db_connect_id)
42 {
43 @sqlite_query('PRAGMA short_column_names = 1', $this->db_connect_id);
44// @sqlite_query('PRAGMA encoding = "UTF-8"', $this->db_connect_id);
45 }
46
47 return ($this->db_connect_id) ? true : array('message' => $error);
48 }
49
50 /**
51 * Version information about used database
52 * @param bool $raw if true, only return the fetched sql_server_version
53 * @return string sql server version
54 */
55 function sql_server_info($raw = false)
56 {
57 global $cache;
58
59 if (empty($cache) || ($this->sql_server_version = $cache->get('sqlite_version')) === false)
60 {
61 $result = @sqlite_query('SELECT sqlite_version() AS version', $this->db_connect_id);
62 $row = @sqlite_fetch_array($result, SQLITE_ASSOC);
63
64 $this->sql_server_version = (!empty($row['version'])) ? $row['version'] : 0;
65 $cache->put('sqlite_version', $this->sql_server_version);
66 }
67
68 return ($raw) ? $this->sql_server_version : 'SQLite ' . $this->sql_server_version;
69 }
70
71 /**
72 * SQL Transaction
73 * @access private
74 */
75 function _sql_transaction($status = 'begin')
76 {
77 switch ($status)
78 {
79 case 'begin':
80 return @sqlite_query('BEGIN', $this->db_connect_id);
81 break;
82
83 case 'commit':
84 return @sqlite_query('COMMIT', $this->db_connect_id);
85 break;
86
87 case 'rollback':
88 return @sqlite_query('ROLLBACK', $this->db_connect_id);
89 break;
90 }
91
92 return true;
93 }
94
95 /**
96 * Base query method
97 *
98 * @param string $query Contains the SQL query which shall be executed
99 * @param int $cache_ttl Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
100 * @return mixed When casted to bool the returned value returns true on success and false on failure
101 *
102 * @access public
103 */
104 function sql_query($query = '', $cache_ttl = 0)
105 {
106 if ($query != '')
107 {
108 global $cache;
109
110 // EXPLAIN only in extra debug mode
111 if (defined('DEBUG_EXTRA'))
112 {
113 $this->sql_report('start', $query);
114 }
115
116 $this->query_result = ($cache_ttl && method_exists($cache, 'sql_load')) ? $cache->sql_load($query) : false;
117 $this->sql_add_num_queries($this->query_result);
118
119 if ($this->query_result === false)
120 {
121 if (($this->query_result = @sqlite_query($query, $this->db_connect_id)) === false)
122 {
123 $this->sql_error($query);
124 }
125
126 if (defined('DEBUG_EXTRA'))
127 {
128 $this->sql_report('stop', $query);
129 }
130
131 if ($cache_ttl && method_exists($cache, 'sql_save'))
132 {
133 $this->open_queries[(int) $this->query_result] = $this->query_result;
134 $cache->sql_save($query, $this->query_result, $cache_ttl);
135 }
136 else if (strpos($query, 'SELECT') === 0 && $this->query_result)
137 {
138 $this->open_queries[(int) $this->query_result] = $this->query_result;
139 }
140 }
141 else if (defined('DEBUG_EXTRA'))
142 {
143 $this->sql_report('fromcache', $query);
144 }
145 }
146 else
147 {
148 return false;
149 }
150
151 return $this->query_result;
152 }
153
154 /**
155 * Build LIMIT query
156 */
157 function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
158 {
159 $this->query_result = false;
160
161 // if $total is set to 0 we do not want to limit the number of rows
162 if ($total == 0)
163 {
164 $total = -1;
165 }
166
167 $query .= "\n LIMIT " . ((!empty($offset)) ? $offset . ', ' . $total : $total);
168
169 return $this->sql_query($query, $cache_ttl);
170 }
171
172 /**
173 * Return number of affected rows
174 */
175 function sql_affectedrows()
176 {
177 return ($this->db_connect_id) ? @sqlite_changes($this->db_connect_id) : false;
178 }
179
180 /**
181 * Fetch current row
182 */
183 function sql_fetchrow($query_id = false)
184 {
185 global $cache;
186
187 if ($query_id === false)
188 {
189 $query_id = $this->query_result;
190 }
191
192 if (isset($cache->sql_rowset[$query_id]))
193 {
194 return $cache->sql_fetchrow($query_id);
195 }
196
197 return ($query_id !== false) ? @sqlite_fetch_array($query_id, SQLITE_ASSOC) : false;
198 }
199
200 /**
201 * Seek to given row number
202 * rownum is zero-based
203 */
204 function sql_rowseek($rownum, &$query_id)
205 {
206 global $cache;
207
208 if ($query_id === false)
209 {
210 $query_id = $this->query_result;
211 }
212
213 if (isset($cache->sql_rowset[$query_id]))
214 {
215 return $cache->sql_rowseek($rownum, $query_id);
216 }
217
218 return ($query_id !== false) ? @sqlite_seek($query_id, $rownum) : false;
219 }
220
221 /**
222 * Get last inserted id after insert statement
223 */
224 function sql_nextid()
225 {
226 return ($this->db_connect_id) ? @sqlite_last_insert_rowid($this->db_connect_id) : false;
227 }
228
229 /**
230 * Free sql result
231 */
232 function sql_freeresult($query_id = false)
233 {
234 global $cache;
235
236 if ($query_id === false)
237 {
238 $query_id = $this->query_result;
239 }
240
241 if (isset($cache->sql_rowset[$query_id]))
242 {
243 return $cache->sql_freeresult($query_id);
244 }
245
246 return true;
247 }
248
249 /**
250 * Escape string used in sql query
251 */
252 function sql_escape($msg)
253 {
254 return @sqlite_escape_string($msg);
255 }
256
257 /**
258 * Correctly adjust LIKE expression for special characters
259 * For SQLite an underscore is a not-known character... this may change with SQLite3
260 */
261 function sql_like_expression($expression)
262 {
263 // Unlike LIKE, GLOB is case sensitive (unfortunatly). SQLite users need to live with it!
264 // We only catch * and ? here, not the character map possible on file globbing.
265 $expression = str_replace(array(chr(0) . '_', chr(0) . '%'), array(chr(0) . '?', chr(0) . '*'), $expression);
266
267 $expression = str_replace(array('?', '*'), array("\?", "\*"), $expression);
268 $expression = str_replace(array(chr(0) . "\?", chr(0) . "\*"), array('?', '*'), $expression);
269
270 return 'GLOB \'' . $this->sql_escape($expression) . '\'';
271 }
272
273 /**
274 * return sql error array
275 * @access private
276 */
277 function _sql_error()
278 {
279 return array(
280 'message' => @sqlite_error_string(@sqlite_last_error($this->db_connect_id)),
281 'code' => @sqlite_last_error($this->db_connect_id)
282 );
283 }
284
285 /**
286 * Build db-specific query data
287 * @access private
288 */
289 function _sql_custom_build($stage, $data)
290 {
291 return $data;
292 }
293
294 /**
295 * Close sql connection
296 * @access private
297 */
298 function _sql_close()
299 {
300 return @sqlite_close($this->db_connect_id);
301 }
302
303 /**
304 * Build db-specific report
305 * @access private
306 */
307 function _sql_report($mode, $query = '')
308 {
309 switch ($mode)
310 {
311 case 'start':
312 break;
313
314 case 'fromcache':
315 $endtime = explode(' ', microtime());
316 $endtime = $endtime[0] + $endtime[1];
317
318 $result = @sqlite_query($query, $this->db_connect_id);
319 while ($void = @sqlite_fetch_array($result, SQLITE_ASSOC))
320 {
321 // Take the time spent on parsing rows into account
322 }
323
324 $splittime = explode(' ', microtime());
325 $splittime = $splittime[0] + $splittime[1];
326
327 $this->sql_report('record_fromcache', $query, $endtime, $splittime);
328
329 break;
330 }
331 }
332}
333
334?>
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