source: trunk/forum/includes/db/oracle.php@ 448

Last change on this file since 448 was 400, checked in by george, 17 years ago
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1<?php
2/**
3*
4* @package dbal
5* @version $Id: oracle.php 9175 2008-12-05 11:18:59Z 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* Oracle Database Abstraction Layer
23* @package dbal
24*/
25class dbal_oracle extends dbal
26{
27 var $last_query_text = '';
28
29 /**
30 * Connect to server
31 */
32 function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
33 {
34 $this->persistency = $persistency;
35 $this->user = $sqluser;
36 $this->server = $sqlserver . (($port) ? ':' . $port : '');
37 $this->dbname = $database;
38
39 $connect = $database;
40
41 // support for "easy connect naming"
42 if ($sqlserver !== '' && $sqlserver !== '/')
43 {
44 if (substr($sqlserver, -1, 1) == '/')
45 {
46 $sqlserver == substr($sqlserver, 0, -1);
47 }
48 $connect = $sqlserver . (($port) ? ':' . $port : '') . '/' . $database;
49 }
50
51 $this->db_connect_id = ($new_link) ? @ocinlogon($this->user, $sqlpassword, $connect, 'UTF8') : (($this->persistency) ? @ociplogon($this->user, $sqlpassword, $connect, 'UTF8') : @ocilogon($this->user, $sqlpassword, $connect, 'UTF8'));
52
53 return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
54 }
55
56 /**
57 * Version information about used database
58 * @param bool $raw if true, only return the fetched sql_server_version
59 * @return string sql server version
60 */
61 function sql_server_info($raw = false)
62 {
63/*
64 global $cache;
65
66 if (empty($cache) || ($this->sql_server_version = $cache->get('oracle_version')) === false)
67 {
68 $result = @ociparse($this->db_connect_id, 'SELECT * FROM v$version WHERE banner LIKE \'Oracle%\'');
69 @ociexecute($result, OCI_DEFAULT);
70 @ocicommit($this->db_connect_id);
71
72 $row = array();
73 @ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS);
74 @ocifreestatement($result);
75 $this->sql_server_version = trim($row['BANNER']);
76
77 $cache->put('oracle_version', $this->sql_server_version);
78 }
79*/
80 $this->sql_server_version = @ociserverversion($this->db_connect_id);
81
82 return $this->sql_server_version;
83 }
84
85 /**
86 * SQL Transaction
87 * @access private
88 */
89 function _sql_transaction($status = 'begin')
90 {
91 switch ($status)
92 {
93 case 'begin':
94 return true;
95 break;
96
97 case 'commit':
98 return @ocicommit($this->db_connect_id);
99 break;
100
101 case 'rollback':
102 return @ocirollback($this->db_connect_id);
103 break;
104 }
105
106 return true;
107 }
108
109 /**
110 * Oracle specific code to handle the fact that it does not compare columns properly
111 * @access private
112 */
113 function _rewrite_col_compare($args)
114 {
115 if (sizeof($args) == 4)
116 {
117 if ($args[2] == '=')
118 {
119 return '(' . $args[0] . ' OR (' . $args[1] . ' is NULL AND ' . $args[3] . ' is NULL))';
120 }
121 else if ($args[2] == '<>')
122 {
123 // really just a fancy way of saying foo <> bar or (foo is NULL XOR bar is NULL) but SQL has no XOR :P
124 return '(' . $args[0] . ' OR ((' . $args[1] . ' is NULL AND ' . $args[3] . ' is NOT NULL) OR (' . $args[1] . ' is NOT NULL AND ' . $args[3] . ' is NULL)))';
125 }
126 }
127 else
128 {
129 return $this->_rewrite_where($args[0]);
130 }
131 }
132
133 /**
134 * Oracle specific code to handle it's lack of sanity
135 * @access private
136 */
137 function _rewrite_where($where_clause)
138 {
139 preg_match_all('/\s*(AND|OR)?\s*([\w_.]++)\s*(?:(=|<[=>]?|>=?)\s*((?>\'(?>[^\']++|\'\')*+\'|[\d-.]+))|((NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]+,? ?)*+\)))/', $where_clause, $result, PREG_SET_ORDER);
140 $out = '';
141 foreach ($result as $val)
142 {
143 if (!isset($val[5]))
144 {
145 if ($val[4] !== "''")
146 {
147 $out .= $val[0];
148 }
149 else
150 {
151 $out .= ' ' . $val[1] . ' ' . $val[2];
152 if ($val[3] == '=')
153 {
154 $out .= ' is NULL';
155 }
156 else if ($val[3] == '<>')
157 {
158 $out .= ' is NOT NULL';
159 }
160 }
161 }
162 else
163 {
164 $in_clause = array();
165 $sub_exp = substr($val[5], strpos($val[5], '(') + 1, -1);
166 $extra = false;
167 preg_match_all('/\'(?>[^\']++|\'\')*+\'|[\d-.]++/', $sub_exp, $sub_vals, PREG_PATTERN_ORDER);
168 $i = 0;
169 foreach ($sub_vals[0] as $sub_val)
170 {
171 // two things:
172 // 1) This determines if an empty string was in the IN clausing, making us turn it into a NULL comparison
173 // 2) This fixes the 1000 list limit that Oracle has (ORA-01795)
174 if ($sub_val !== "''")
175 {
176 $in_clause[(int) $i++/1000][] = $sub_val;
177 }
178 else
179 {
180 $extra = true;
181 }
182 }
183 if (!$extra && $i < 1000)
184 {
185 $out .= $val[0];
186 }
187 else
188 {
189 $out .= ' ' . $val[1] . '(';
190 $in_array = array();
191
192 // constuct each IN() clause
193 foreach ($in_clause as $in_values)
194 {
195 $in_array[] = $val[2] . ' ' . (isset($val[6]) ? $val[6] : '') . 'IN(' . implode(', ', $in_values) . ')';
196 }
197
198 // Join the IN() clauses against a few ORs (IN is just a nicer OR anyway)
199 $out .= implode(' OR ', $in_array);
200
201 // handle the empty string case
202 if ($extra)
203 {
204 $out .= ' OR ' . $val[2] . ' is ' . (isset($val[6]) ? $val[6] : '') . 'NULL';
205 }
206 $out .= ')';
207
208 unset($in_array, $in_clause);
209 }
210 }
211 }
212
213 return $out;
214 }
215
216 /**
217 * Base query method
218 *
219 * @param string $query Contains the SQL query which shall be executed
220 * @param int $cache_ttl Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
221 * @return mixed When casted to bool the returned value returns true on success and false on failure
222 *
223 * @access public
224 */
225 function sql_query($query = '', $cache_ttl = 0)
226 {
227 if ($query != '')
228 {
229 global $cache;
230
231 // EXPLAIN only in extra debug mode
232 if (defined('DEBUG_EXTRA'))
233 {
234 $this->sql_report('start', $query);
235 }
236
237 $this->last_query_text = $query;
238 $this->query_result = ($cache_ttl && method_exists($cache, 'sql_load')) ? $cache->sql_load($query) : false;
239 $this->sql_add_num_queries($this->query_result);
240
241 if ($this->query_result === false)
242 {
243 $in_transaction = false;
244 if (!$this->transaction)
245 {
246 $this->sql_transaction('begin');
247 }
248 else
249 {
250 $in_transaction = true;
251 }
252
253 $array = array();
254
255 // We overcome Oracle's 4000 char limit by binding vars
256 if (strlen($query) > 4000)
257 {
258 if (preg_match('/^(INSERT INTO[^(]++)\\(([^()]+)\\) VALUES[^(]++\\((.*?)\\)$/s', $query, $regs))
259 {
260 if (strlen($regs[3]) > 4000)
261 {
262 $cols = explode(', ', $regs[2]);
263 preg_match_all('/\'(?:[^\']++|\'\')*+\'|[\d-.]+/', $regs[3], $vals, PREG_PATTERN_ORDER);
264
265 $inserts = $vals[0];
266 unset($vals);
267
268 foreach ($inserts as $key => $value)
269 {
270 if (!empty($value) && $value[0] === "'" && strlen($value) > 4002) // check to see if this thing is greater than the max + 'x2
271 {
272 $inserts[$key] = ':' . strtoupper($cols[$key]);
273 $array[$inserts[$key]] = str_replace("''", "'", substr($value, 1, -1));
274 }
275 }
276
277 $query = $regs[1] . '(' . $regs[2] . ') VALUES (' . implode(', ', $inserts) . ')';
278 }
279 }
280 else if (preg_match_all('/^(UPDATE [\\w_]++\\s+SET )([\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+)(?:,\\s*[\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+))*+)\\s+(WHERE.*)$/s', $query, $data, PREG_SET_ORDER))
281 {
282 if (strlen($data[0][2]) > 4000)
283 {
284 $update = $data[0][1];
285 $where = $data[0][3];
286 preg_match_all('/([\\w_]++)\\s*=\\s*(\'(?:[^\']++|\'\')*+\'|[\d-.]++)/', $data[0][2], $temp, PREG_SET_ORDER);
287 unset($data);
288
289 $cols = array();
290 foreach ($temp as $value)
291 {
292 if (!empty($value[2]) && $value[2][0] === "'" && strlen($value[2]) > 4002) // check to see if this thing is greater than the max + 'x2
293 {
294 $cols[] = $value[1] . '=:' . strtoupper($value[1]);
295 $array[$value[1]] = str_replace("''", "'", substr($value[2], 1, -1));
296 }
297 else
298 {
299 $cols[] = $value[1] . '=' . $value[2];
300 }
301 }
302
303 $query = $update . implode(', ', $cols) . ' ' . $where;
304 unset($cols);
305 }
306 }
307 }
308
309 switch (substr($query, 0, 6))
310 {
311 case 'DELETE':
312 if (preg_match('/^(DELETE FROM [\w_]++ WHERE)((?:\s*(?:AND|OR)?\s*[\w_]+\s*(?:(?:=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]+)|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]+,? ?)*+\)))*+)$/', $query, $regs))
313 {
314 $query = $regs[1] . $this->_rewrite_where($regs[2]);
315 unset($regs);
316 }
317 break;
318
319 case 'UPDATE':
320 if (preg_match('/^(UPDATE [\\w_]++\\s+SET [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++)(?:, [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++))*+\\s+WHERE)(.*)$/s', $query, $regs))
321 {
322 $query = $regs[1] . $this->_rewrite_where($regs[2]);
323 unset($regs);
324 }
325 break;
326
327 case 'SELECT':
328 $query = preg_replace_callback('/([\w_.]++)\s*(?:(=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]++|([\w_.]++))|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]++,? ?)*+\))/', array($this, '_rewrite_col_compare'), $query);
329 break;
330 }
331
332 $this->query_result = @ociparse($this->db_connect_id, $query);
333
334 foreach ($array as $key => $value)
335 {
336 @ocibindbyname($this->query_result, $key, $array[$key], -1);
337 }
338
339 $success = @ociexecute($this->query_result, OCI_DEFAULT);
340
341 if (!$success)
342 {
343 $this->sql_error($query);
344 $this->query_result = false;
345 }
346 else
347 {
348 if (!$in_transaction)
349 {
350 $this->sql_transaction('commit');
351 }
352 }
353
354 if (defined('DEBUG_EXTRA'))
355 {
356 $this->sql_report('stop', $query);
357 }
358
359 if ($cache_ttl && method_exists($cache, 'sql_save'))
360 {
361 $this->open_queries[(int) $this->query_result] = $this->query_result;
362 $cache->sql_save($query, $this->query_result, $cache_ttl);
363 }
364 else if (strpos($query, 'SELECT') === 0 && $this->query_result)
365 {
366 $this->open_queries[(int) $this->query_result] = $this->query_result;
367 }
368 }
369 else if (defined('DEBUG_EXTRA'))
370 {
371 $this->sql_report('fromcache', $query);
372 }
373 }
374 else
375 {
376 return false;
377 }
378
379 return $this->query_result;
380 }
381
382 /**
383 * Build LIMIT query
384 */
385 function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
386 {
387 $this->query_result = false;
388
389 $query = 'SELECT * FROM (SELECT /*+ FIRST_ROWS */ rownum AS xrownum, a.* FROM (' . $query . ') a WHERE rownum <= ' . ($offset + $total) . ') WHERE xrownum >= ' . $offset;
390
391 return $this->sql_query($query, $cache_ttl);
392 }
393
394 /**
395 * Return number of affected rows
396 */
397 function sql_affectedrows()
398 {
399 return ($this->query_result) ? @ocirowcount($this->query_result) : false;
400 }
401
402 /**
403 * Fetch current row
404 */
405 function sql_fetchrow($query_id = false)
406 {
407 global $cache;
408
409 if ($query_id === false)
410 {
411 $query_id = $this->query_result;
412 }
413
414 if (isset($cache->sql_rowset[$query_id]))
415 {
416 return $cache->sql_fetchrow($query_id);
417 }
418
419 if ($query_id !== false)
420 {
421 $row = array();
422 $result = @ocifetchinto($query_id, $row, OCI_ASSOC + OCI_RETURN_NULLS);
423
424 if (!$result || !$row)
425 {
426 return false;
427 }
428
429 $result_row = array();
430 foreach ($row as $key => $value)
431 {
432 // Oracle treats empty strings as null
433 if (is_null($value))
434 {
435 $value = '';
436 }
437
438 // OCI->CLOB?
439 if (is_object($value))
440 {
441 $value = $value->load();
442 }
443
444 $result_row[strtolower($key)] = $value;
445 }
446
447 return $result_row;
448 }
449
450 return false;
451 }
452
453 /**
454 * Seek to given row number
455 * rownum is zero-based
456 */
457 function sql_rowseek($rownum, &$query_id)
458 {
459 global $cache;
460
461 if ($query_id === false)
462 {
463 $query_id = $this->query_result;
464 }
465
466 if (isset($cache->sql_rowset[$query_id]))
467 {
468 return $cache->sql_rowseek($rownum, $query_id);
469 }
470
471 if ($query_id === false)
472 {
473 return false;
474 }
475
476 // Reset internal pointer
477 @ociexecute($query_id, OCI_DEFAULT);
478
479 // We do not fetch the row for rownum == 0 because then the next resultset would be the second row
480 for ($i = 0; $i < $rownum; $i++)
481 {
482 if (!$this->sql_fetchrow($query_id))
483 {
484 return false;
485 }
486 }
487
488 return true;
489 }
490
491 /**
492 * Get last inserted id after insert statement
493 */
494 function sql_nextid()
495 {
496 $query_id = $this->query_result;
497
498 if ($query_id !== false && $this->last_query_text != '')
499 {
500 if (preg_match('#^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)#is', $this->last_query_text, $tablename))
501 {
502 $query = 'SELECT ' . $tablename[1] . '_seq.currval FROM DUAL';
503 $stmt = @ociparse($this->db_connect_id, $query);
504 @ociexecute($stmt, OCI_DEFAULT);
505
506 $temp_result = @ocifetchinto($stmt, $temp_array, OCI_ASSOC + OCI_RETURN_NULLS);
507 @ocifreestatement($stmt);
508
509 if ($temp_result)
510 {
511 return $temp_array['CURRVAL'];
512 }
513 else
514 {
515 return false;
516 }
517 }
518 }
519
520 return false;
521 }
522
523 /**
524 * Free sql result
525 */
526 function sql_freeresult($query_id = false)
527 {
528 global $cache;
529
530 if ($query_id === false)
531 {
532 $query_id = $this->query_result;
533 }
534
535 if (isset($cache->sql_rowset[$query_id]))
536 {
537 return $cache->sql_freeresult($query_id);
538 }
539
540 if (isset($this->open_queries[(int) $query_id]))
541 {
542 unset($this->open_queries[(int) $query_id]);
543 return @ocifreestatement($query_id);
544 }
545
546 return false;
547 }
548
549 /**
550 * Escape string used in sql query
551 */
552 function sql_escape($msg)
553 {
554 return str_replace(array("'", "\0"), array("''", ''), $msg);
555 }
556
557 /**
558 * Build LIKE expression
559 * @access private
560 */
561 function _sql_like_expression($expression)
562 {
563 return $expression . " ESCAPE '\\'";
564 }
565
566 function _sql_custom_build($stage, $data)
567 {
568 return $data;
569 }
570
571 /**
572 * return sql error array
573 * @access private
574 */
575 function _sql_error()
576 {
577 $error = @ocierror();
578 $error = (!$error) ? @ocierror($this->query_result) : $error;
579 $error = (!$error) ? @ocierror($this->db_connect_id) : $error;
580
581 if ($error)
582 {
583 $this->last_error_result = $error;
584 }
585 else
586 {
587 $error = (isset($this->last_error_result) && $this->last_error_result) ? $this->last_error_result : array();
588 }
589
590 return $error;
591 }
592
593 /**
594 * Close sql connection
595 * @access private
596 */
597 function _sql_close()
598 {
599 return @ocilogoff($this->db_connect_id);
600 }
601
602 /**
603 * Build db-specific report
604 * @access private
605 */
606 function _sql_report($mode, $query = '')
607 {
608 switch ($mode)
609 {
610 case 'start':
611
612 $html_table = false;
613
614 // Grab a plan table, any will do
615 $sql = "SELECT table_name
616 FROM USER_TABLES
617 WHERE table_name LIKE '%PLAN_TABLE%'";
618 $stmt = ociparse($this->db_connect_id, $sql);
619 ociexecute($stmt);
620 $result = array();
621
622 if (ocifetchinto($stmt, $result, OCI_ASSOC + OCI_RETURN_NULLS))
623 {
624 $table = $result['TABLE_NAME'];
625
626 // This is the statement_id that will allow us to track the plan
627 $statement_id = substr(md5($query), 0, 30);
628
629 // Remove any stale plans
630 $stmt2 = ociparse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
631 ociexecute($stmt2);
632 ocifreestatement($stmt2);
633
634 // Explain the plan
635 $sql = "EXPLAIN PLAN
636 SET STATEMENT_ID = '$statement_id'
637 FOR $query";
638 $stmt2 = ociparse($this->db_connect_id, $sql);
639 ociexecute($stmt2);
640 ocifreestatement($stmt2);
641
642 // Get the data from the plan
643 $sql = "SELECT operation, options, object_name, object_type, cardinality, cost
644 FROM plan_table
645 START WITH id = 0 AND statement_id = '$statement_id'
646 CONNECT BY PRIOR id = parent_id
647 AND statement_id = '$statement_id'";
648 $stmt2 = ociparse($this->db_connect_id, $sql);
649 ociexecute($stmt2);
650
651 $row = array();
652 while (ocifetchinto($stmt2, $row, OCI_ASSOC + OCI_RETURN_NULLS))
653 {
654 $html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
655 }
656
657 ocifreestatement($stmt2);
658
659 // Remove the plan we just made, we delete them on request anyway
660 $stmt2 = ociparse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
661 ociexecute($stmt2);
662 ocifreestatement($stmt2);
663 }
664
665 ocifreestatement($stmt);
666
667 if ($html_table)
668 {
669 $this->html_hold .= '</table>';
670 }
671
672 break;
673
674 case 'fromcache':
675 $endtime = explode(' ', microtime());
676 $endtime = $endtime[0] + $endtime[1];
677
678 $result = @ociparse($this->db_connect_id, $query);
679 $success = @ociexecute($result, OCI_DEFAULT);
680 $row = array();
681
682 while (@ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS))
683 {
684 // Take the time spent on parsing rows into account
685 }
686 @ocifreestatement($result);
687
688 $splittime = explode(' ', microtime());
689 $splittime = $splittime[0] + $splittime[1];
690
691 $this->sql_report('record_fromcache', $query, $endtime, $splittime);
692
693 break;
694 }
695 }
696}
697
698?>
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