Verzeichnisstruktur phpBB-3.1.0
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- 27.10.2014
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sqlite3.php
001 <?php
002 /**
003 *
004 * This file is part of the phpBB Forum Software package.
005 *
006 * @copyright (c) phpBB Limited <https://www.phpbb.com>
007 * @license GNU General Public License, version 2 (GPL-2.0)
008 *
009 * For full copyright and license information, please see
010 * the docs/CREDITS.txt file.
011 *
012 */
013
014 namespace phpbb\db\driver;
015
016 /**
017 * SQLite3 Database Abstraction Layer
018 * Minimum Requirement: 3.6.15+
019 */
020 class sqlite3 extends \phpbb\db\driver\driver
021 {
022 /**
023 * @var string Stores errors during connection setup in case the driver is not available
024 */
025 protected $connect_error = '';
026
027 /**
028 * @var \SQLite3 The SQLite3 database object to operate against
029 */
030 protected $dbo = null;
031
032 /**
033 * {@inheritDoc}
034 */
035 public function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
036 {
037 $this->persistency = false;
038 $this->user = $sqluser;
039 $this->server = $sqlserver . (($port) ? ':' . $port : '');
040 $this->dbname = $database;
041
042 if (!class_exists('SQLite3', false))
043 {
044 $this->connect_error = 'SQLite3 not found, is the extension installed?';
045 return $this->sql_error('');
046 }
047
048 try
049 {
050 $this->dbo = new \SQLite3($this->server, SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE);
051 $this->db_connect_id = true;
052 }
053 catch (\Exception $e)
054 {
055 $this->connect_error = $e->getMessage();
056 return array('message' => $this->connect_error);
057 }
058
059 return true;
060 }
061
062 /**
063 * {@inheritDoc}
064 */
065 public function sql_server_info($raw = false, $use_cache = true)
066 {
067 global $cache;
068
069 if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('sqlite_version')) === false)
070 {
071 $version = \SQLite3::version();
072
073 $this->sql_server_version = $version['versionString'];
074
075 if (!empty($cache) && $use_cache)
076 {
077 $cache->put('sqlite_version', $this->sql_server_version);
078 }
079 }
080
081 return ($raw) ? $this->sql_server_version : 'SQLite ' . $this->sql_server_version;
082 }
083
084 /**
085 * SQL Transaction
086 *
087 * @param string $status Should be one of the following strings:
088 * begin, commit, rollback
089 * @return bool Success/failure of the transaction query
090 */
091 protected function _sql_transaction($status = 'begin')
092 {
093 switch ($status)
094 {
095 case 'begin':
096 return $this->dbo->exec('BEGIN IMMEDIATE');
097 break;
098
099 case 'commit':
100 return $this->dbo->exec('COMMIT');
101 break;
102
103 case 'rollback':
104 return $this->dbo->exec('ROLLBACK');
105 break;
106 }
107
108 return true;
109 }
110
111 /**
112 * {@inheritDoc}
113 */
114 public function sql_query($query = '', $cache_ttl = 0)
115 {
116 if ($query != '')
117 {
118 global $cache;
119
120 // EXPLAIN only in extra debug mode
121 if (defined('DEBUG'))
122 {
123 $this->sql_report('start', $query);
124 }
125 else if (defined('PHPBB_DISPLAY_LOAD_TIME'))
126 {
127 $this->curtime = microtime(true);
128 }
129
130 $this->last_query_text = $query;
131 $this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
132 $this->sql_add_num_queries($this->query_result);
133
134 if ($this->query_result === false)
135 {
136 if (($this->query_result = @$this->dbo->query($query)) === false)
137 {
138 $this->sql_error($query);
139 }
140
141 if (defined('DEBUG'))
142 {
143 $this->sql_report('stop', $query);
144 }
145 else if (defined('PHPBB_DISPLAY_LOAD_TIME'))
146 {
147 $this->sql_time += microtime(true) - $this->curtime;
148 }
149
150 if ($cache && $cache_ttl)
151 {
152 $this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
153 }
154 }
155 else if (defined('DEBUG'))
156 {
157 $this->sql_report('fromcache', $query);
158 }
159 }
160 else
161 {
162 return false;
163 }
164
165 return $this->query_result;
166 }
167
168 /**
169 * Build LIMIT query
170 *
171 * @param string $query The SQL query to execute
172 * @param int $total The number of rows to select
173 * @param int $offset
174 * @param int $cache_ttl Either 0 to avoid caching or
175 * the time in seconds which the result shall be kept in cache
176 * @return mixed Buffered, seekable result handle, false on error
177 */
178 protected function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
179 {
180 $this->query_result = false;
181
182 // if $total is set to 0 we do not want to limit the number of rows
183 if ($total == 0)
184 {
185 $total = -1;
186 }
187
188 $query .= "\n LIMIT " . ((!empty($offset)) ? $offset . ', ' . $total : $total);
189
190 return $this->sql_query($query, $cache_ttl);
191 }
192
193 /**
194 * {@inheritDoc}
195 */
196 public function sql_affectedrows()
197 {
198 return ($this->db_connect_id) ? $this->dbo->changes() : false;
199 }
200
201 /**
202 * {@inheritDoc}
203 */
204 public function sql_fetchrow($query_id = false)
205 {
206 global $cache;
207
208 if ($query_id === false)
209 {
210 $query_id = $this->query_result;
211 }
212
213 if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
214 {
215 return $cache->sql_fetchrow($query_id);
216 }
217
218 return is_object($query_id) ? $query_id->fetchArray(SQLITE3_ASSOC) : false;
219 }
220
221 /**
222 * {@inheritDoc}
223 */
224 public function sql_nextid()
225 {
226 return ($this->db_connect_id) ? $this->dbo->lastInsertRowID() : false;
227 }
228
229 /**
230 * {@inheritDoc}
231 */
232 public function sql_freeresult($query_id = false)
233 {
234 global $cache;
235
236 if ($query_id === false)
237 {
238 $query_id = $this->query_result;
239 }
240
241 if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
242 {
243 return $cache->sql_freeresult($query_id);
244 }
245
246 if ($query_id)
247 {
248 return @$query_id->finalize();
249 }
250 }
251
252 /**
253 * {@inheritDoc}
254 */
255 public function sql_escape($msg)
256 {
257 return \SQLite3::escapeString($msg);
258 }
259
260 /**
261 * {@inheritDoc}
262 *
263 * For SQLite an underscore is an unknown character.
264 */
265 public function sql_like_expression($expression)
266 {
267 // Unlike LIKE, GLOB is unfortunately case sensitive.
268 // We only catch * and ? here, not the character map possible on file globbing.
269 $expression = str_replace(array(chr(0) . '_', chr(0) . '%'), array(chr(0) . '?', chr(0) . '*'), $expression);
270
271 $expression = str_replace(array('?', '*'), array("\?", "\*"), $expression);
272 $expression = str_replace(array(chr(0) . "\?", chr(0) . "\*"), array('?', '*'), $expression);
273
274 return 'GLOB \'' . $this->sql_escape($expression) . '\'';
275 }
276
277 /**
278 * {@inheritDoc}
279 *
280 * For SQLite an underscore is an unknown character.
281 */
282 public function sql_not_like_expression($expression)
283 {
284 // Unlike NOT LIKE, NOT GLOB is unfortunately case sensitive
285 // We only catch * and ? here, not the character map possible on file globbing.
286 $expression = str_replace(array(chr(0) . '_', chr(0) . '%'), array(chr(0) . '?', chr(0) . '*'), $expression);
287
288 $expression = str_replace(array('?', '*'), array("\?", "\*"), $expression);
289 $expression = str_replace(array(chr(0) . "\?", chr(0) . "\*"), array('?', '*'), $expression);
290
291 return 'NOT GLOB \'' . $this->sql_escape($expression) . '\'';
292 }
293
294 /**
295 * return sql error array
296 *
297 * @return array
298 */
299 protected function _sql_error()
300 {
301 if (class_exists('SQLite3', false) && isset($this->dbo))
302 {
303 $error = array(
304 'message' => $this->dbo->lastErrorMsg(),
305 'code' => $this->dbo->lastErrorCode(),
306 );
307 }
308 else
309 {
310 $error = array(
311 'message' => $this->connect_error,
312 'code' => '',
313 );
314 }
315
316 return $error;
317 }
318
319 /**
320 * Build db-specific query data
321 *
322 * @param string $stage Available stages: FROM, WHERE
323 * @param mixed $data A string containing the CROSS JOIN query or an array of WHERE clauses
324 *
325 * @return string The db-specific query fragment
326 */
327 protected function _sql_custom_build($stage, $data)
328 {
329 return $data;
330 }
331
332 /**
333 * Close sql connection
334 *
335 * @return bool False if failure
336 */
337 protected function _sql_close()
338 {
339 return $this->dbo->close();
340 }
341
342 /**
343 * Build db-specific report
344 *
345 * @param string $mode Available modes: display, start, stop,
346 * add_select_row, fromcache, record_fromcache
347 * @param string $query The Query that should be explained
348 * @return mixed Either a full HTML page, boolean or null
349 */
350 protected function _sql_report($mode, $query = '')
351 {
352 switch ($mode)
353 {
354 case 'start':
355
356 $explain_query = $query;
357 if (preg_match('/UPDATE ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
358 {
359 $explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
360 }
361 else if (preg_match('/DELETE FROM ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
362 {
363 $explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
364 }
365
366 if (preg_match('/^SELECT/', $explain_query))
367 {
368 $html_table = false;
369
370 if ($result = $this->dbo->query("EXPLAIN QUERY PLAN $explain_query"))
371 {
372 while ($row = $result->fetchArray(SQLITE3_ASSOC))
373 {
374 $html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
375 }
376 }
377
378 if ($html_table)
379 {
380 $this->html_hold .= '</table>';
381 }
382 }
383
384 break;
385
386 case 'fromcache':
387 $endtime = explode(' ', microtime());
388 $endtime = $endtime[0] + $endtime[1];
389
390 $result = $this->dbo->query($query);
391 while ($void = $result->fetchArray(SQLITE3_ASSOC))
392 {
393 // Take the time spent on parsing rows into account
394 }
395
396 $splittime = explode(' ', microtime());
397 $splittime = $splittime[0] + $splittime[1];
398
399 $this->sql_report('record_fromcache', $query, $endtime, $splittime);
400
401 break;
402 }
403 }
404 }
405