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- 27.10.2014
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postgres.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 * PostgreSQL Database Abstraction Layer
018 * Minimum Requirement is Version 8.3+
019 */
020 class postgres extends \phpbb\db\driver\driver
021 {
022 var $multi_insert = true;
023 var $last_query_text = '';
024 var $connect_error = '';
025
026 /**
027 * {@inheritDoc}
028 */
029 function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
030 {
031 $connect_string = '';
032
033 if ($sqluser)
034 {
035 $connect_string .= "user=$sqluser ";
036 }
037
038 if ($sqlpassword)
039 {
040 $connect_string .= "password=$sqlpassword ";
041 }
042
043 if ($sqlserver)
044 {
045 // $sqlserver can carry a port separated by : for compatibility reasons
046 // If $sqlserver has more than one : it's probably an IPv6 address.
047 // In this case we only allow passing a port via the $port variable.
048 if (substr_count($sqlserver, ':') === 1)
049 {
050 list($sqlserver, $port) = explode(':', $sqlserver);
051 }
052
053 if ($sqlserver !== 'localhost')
054 {
055 $connect_string .= "host=$sqlserver ";
056 }
057
058 if ($port)
059 {
060 $connect_string .= "port=$port ";
061 }
062 }
063
064 $schema = '';
065
066 if ($database)
067 {
068 $this->dbname = $database;
069 if (strpos($database, '.') !== false)
070 {
071 list($database, $schema) = explode('.', $database);
072 }
073 $connect_string .= "dbname=$database";
074 }
075
076 $this->persistency = $persistency;
077
078 if ($this->persistency)
079 {
080 if (!function_exists('pg_pconnect'))
081 {
082 $this->connect_error = 'pg_pconnect function does not exist, is pgsql extension installed?';
083 return $this->sql_error('');
084 }
085 $collector = new \phpbb\error_collector;
086 $collector->install();
087 $this->db_connect_id = (!$new_link) ? @pg_pconnect($connect_string) : @pg_pconnect($connect_string, PGSQL_CONNECT_FORCE_NEW);
088 }
089 else
090 {
091 if (!function_exists('pg_connect'))
092 {
093 $this->connect_error = 'pg_connect function does not exist, is pgsql extension installed?';
094 return $this->sql_error('');
095 }
096 $collector = new \phpbb\error_collector;
097 $collector->install();
098 $this->db_connect_id = (!$new_link) ? @pg_connect($connect_string) : @pg_connect($connect_string, PGSQL_CONNECT_FORCE_NEW);
099 }
100
101 $collector->uninstall();
102
103 if ($this->db_connect_id)
104 {
105 if ($schema !== '')
106 {
107 @pg_query($this->db_connect_id, 'SET search_path TO ' . $schema);
108 }
109 return $this->db_connect_id;
110 }
111
112 $this->connect_error = $collector->format_errors();
113 return $this->sql_error('');
114 }
115
116 /**
117 * {@inheritDoc}
118 */
119 function sql_server_info($raw = false, $use_cache = true)
120 {
121 global $cache;
122
123 if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('pgsql_version')) === false)
124 {
125 $query_id = @pg_query($this->db_connect_id, 'SELECT VERSION() AS version');
126 $row = @pg_fetch_assoc($query_id, null);
127 @pg_free_result($query_id);
128
129 $this->sql_server_version = (!empty($row['version'])) ? trim(substr($row['version'], 10)) : 0;
130
131 if (!empty($cache) && $use_cache)
132 {
133 $cache->put('pgsql_version', $this->sql_server_version);
134 }
135 }
136
137 return ($raw) ? $this->sql_server_version : 'PostgreSQL ' . $this->sql_server_version;
138 }
139
140 /**
141 * SQL Transaction
142 * @access private
143 */
144 function _sql_transaction($status = 'begin')
145 {
146 switch ($status)
147 {
148 case 'begin':
149 return @pg_query($this->db_connect_id, 'BEGIN');
150 break;
151
152 case 'commit':
153 return @pg_query($this->db_connect_id, 'COMMIT');
154 break;
155
156 case 'rollback':
157 return @pg_query($this->db_connect_id, 'ROLLBACK');
158 break;
159 }
160
161 return true;
162 }
163
164 /**
165 * {@inheritDoc}
166 */
167 function sql_query($query = '', $cache_ttl = 0)
168 {
169 if ($query != '')
170 {
171 global $cache;
172
173 // EXPLAIN only in extra debug mode
174 if (defined('DEBUG'))
175 {
176 $this->sql_report('start', $query);
177 }
178 else if (defined('PHPBB_DISPLAY_LOAD_TIME'))
179 {
180 $this->curtime = microtime(true);
181 }
182
183 $this->last_query_text = $query;
184 $this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
185 $this->sql_add_num_queries($this->query_result);
186
187 if ($this->query_result === false)
188 {
189 if (($this->query_result = @pg_query($this->db_connect_id, $query)) === false)
190 {
191 $this->sql_error($query);
192 }
193
194 if (defined('DEBUG'))
195 {
196 $this->sql_report('stop', $query);
197 }
198 else if (defined('PHPBB_DISPLAY_LOAD_TIME'))
199 {
200 $this->sql_time += microtime(true) - $this->curtime;
201 }
202
203 if ($cache && $cache_ttl)
204 {
205 $this->open_queries[(int) $this->query_result] = $this->query_result;
206 $this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
207 }
208 else if (strpos($query, 'SELECT') === 0 && $this->query_result)
209 {
210 $this->open_queries[(int) $this->query_result] = $this->query_result;
211 }
212 }
213 else if (defined('DEBUG'))
214 {
215 $this->sql_report('fromcache', $query);
216 }
217 }
218 else
219 {
220 return false;
221 }
222
223 return $this->query_result;
224 }
225
226 /**
227 * Build db-specific query data
228 * @access private
229 */
230 function _sql_custom_build($stage, $data)
231 {
232 return $data;
233 }
234
235 /**
236 * Build LIMIT query
237 */
238 function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
239 {
240 $this->query_result = false;
241
242 // if $total is set to 0 we do not want to limit the number of rows
243 if ($total == 0)
244 {
245 $total = 'ALL';
246 }
247
248 $query .= "\n LIMIT $total OFFSET $offset";
249
250 return $this->sql_query($query, $cache_ttl);
251 }
252
253 /**
254 * {@inheritDoc}
255 */
256 function sql_affectedrows()
257 {
258 return ($this->query_result) ? @pg_affected_rows($this->query_result) : false;
259 }
260
261 /**
262 * {@inheritDoc}
263 */
264 function sql_fetchrow($query_id = false)
265 {
266 global $cache;
267
268 if ($query_id === false)
269 {
270 $query_id = $this->query_result;
271 }
272
273 if ($cache && $cache->sql_exists($query_id))
274 {
275 return $cache->sql_fetchrow($query_id);
276 }
277
278 return ($query_id !== false) ? @pg_fetch_assoc($query_id, null) : false;
279 }
280
281 /**
282 * {@inheritDoc}
283 */
284 function sql_rowseek($rownum, &$query_id)
285 {
286 global $cache;
287
288 if ($query_id === false)
289 {
290 $query_id = $this->query_result;
291 }
292
293 if ($cache && $cache->sql_exists($query_id))
294 {
295 return $cache->sql_rowseek($rownum, $query_id);
296 }
297
298 return ($query_id !== false) ? @pg_result_seek($query_id, $rownum) : false;
299 }
300
301 /**
302 * {@inheritDoc}
303 */
304 function sql_nextid()
305 {
306 $query_id = $this->query_result;
307
308 if ($query_id !== false && $this->last_query_text != '')
309 {
310 if (preg_match("/^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)/is", $this->last_query_text, $tablename))
311 {
312 $query = "SELECT currval('" . $tablename[1] . "_seq') AS last_value";
313 $temp_q_id = @pg_query($this->db_connect_id, $query);
314
315 if (!$temp_q_id)
316 {
317 return false;
318 }
319
320 $temp_result = @pg_fetch_assoc($temp_q_id, null);
321 @pg_free_result($query_id);
322
323 return ($temp_result) ? $temp_result['last_value'] : false;
324 }
325 }
326
327 return false;
328 }
329
330 /**
331 * {@inheritDoc}
332 */
333 function sql_freeresult($query_id = false)
334 {
335 global $cache;
336
337 if ($query_id === false)
338 {
339 $query_id = $this->query_result;
340 }
341
342 if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
343 {
344 return $cache->sql_freeresult($query_id);
345 }
346
347 if (isset($this->open_queries[(int) $query_id]))
348 {
349 unset($this->open_queries[(int) $query_id]);
350 return @pg_free_result($query_id);
351 }
352
353 return false;
354 }
355
356 /**
357 * {@inheritDoc}
358 */
359 function sql_escape($msg)
360 {
361 return @pg_escape_string($msg);
362 }
363
364 /**
365 * Build LIKE expression
366 * @access private
367 */
368 function _sql_like_expression($expression)
369 {
370 return $expression;
371 }
372
373 /**
374 * Build NOT LIKE expression
375 * @access private
376 */
377 function _sql_not_like_expression($expression)
378 {
379 return $expression;
380 }
381
382 /**
383 * {@inheritDoc}
384 */
385 function cast_expr_to_bigint($expression)
386 {
387 return 'CAST(' . $expression . ' as DECIMAL(255, 0))';
388 }
389
390 /**
391 * {@inheritDoc}
392 */
393 function cast_expr_to_string($expression)
394 {
395 return 'CAST(' . $expression . ' as VARCHAR(255))';
396 }
397
398 /**
399 * return sql error array
400 * @access private
401 */
402 function _sql_error()
403 {
404 // pg_last_error only works when there is an established connection.
405 // Connection errors have to be tracked by us manually.
406 if ($this->db_connect_id)
407 {
408 $message = @pg_last_error($this->db_connect_id);
409 }
410 else
411 {
412 $message = $this->connect_error;
413 }
414
415 return array(
416 'message' => $message,
417 'code' => ''
418 );
419 }
420
421 /**
422 * Close sql connection
423 * @access private
424 */
425 function _sql_close()
426 {
427 return @pg_close($this->db_connect_id);
428 }
429
430 /**
431 * Build db-specific report
432 * @access private
433 */
434 function _sql_report($mode, $query = '')
435 {
436 switch ($mode)
437 {
438 case 'start':
439
440 $explain_query = $query;
441 if (preg_match('/UPDATE ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
442 {
443 $explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
444 }
445 else if (preg_match('/DELETE FROM ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
446 {
447 $explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
448 }
449
450 if (preg_match('/^SELECT/', $explain_query))
451 {
452 $html_table = false;
453
454 if ($result = @pg_query($this->db_connect_id, "EXPLAIN $explain_query"))
455 {
456 while ($row = @pg_fetch_assoc($result, null))
457 {
458 $html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
459 }
460 }
461 @pg_free_result($result);
462
463 if ($html_table)
464 {
465 $this->html_hold .= '</table>';
466 }
467 }
468
469 break;
470
471 case 'fromcache':
472 $endtime = explode(' ', microtime());
473 $endtime = $endtime[0] + $endtime[1];
474
475 $result = @pg_query($this->db_connect_id, $query);
476 while ($void = @pg_fetch_assoc($result, null))
477 {
478 // Take the time spent on parsing rows into account
479 }
480 @pg_free_result($result);
481
482 $splittime = explode(' ', microtime());
483 $splittime = $splittime[0] + $splittime[1];
484
485 $this->sql_report('record_fromcache', $query, $endtime, $splittime);
486
487 break;
488 }
489 }
490 }
491