source: branches/posledni/forum/includes/db/oracle.php

Last change on this file was 702, checked in by george, 16 years ago
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1<?php
2/**
3*
4* @package dbal
5* @version $Id$
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*(?:(=|<[=>]?|>=?|LIKE)\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[^(]++\\((.*?)\\)$/sU', $query, $regs))
259 {
260 if (strlen($regs[3]) > 4000)
261 {
262 $cols = explode(', ', $regs[2]);
263
264 preg_match_all('/\'(?:[^\']++|\'\')*+\'|[\d-.]+/', $regs[3], $vals, PREG_PATTERN_ORDER);
265
266 if (sizeof($cols) !== sizeof($vals))
267 {
268 // Try to replace some common data we know is from our restore script or from other sources
269 $regs[3] = str_replace("'||chr(47)||'", '/', $regs[3]);
270 $_vals = explode(', ', $regs[3]);
271
272 $vals = array();
273 $is_in_val = false;
274 $i = 0;
275 $string = '';
276
277 foreach ($_vals as $value)
278 {
279 if (strpos($value, "'") === false && !$is_in_val)
280 {
281 $vals[$i++] = $value;
282 continue;
283 }
284
285 if (substr($value, -1) === "'")
286 {
287 $vals[$i] = $string . (($is_in_val) ? ', ' : '') . $value;
288 $string = '';
289 $is_in_val = false;
290
291 if ($vals[$i][0] !== "'")
292 {
293 $vals[$i] = "''" . $vals[$i];
294 }
295 $i++;
296 continue;
297 }
298 else
299 {
300 $string .= (($is_in_val) ? ', ' : '') . $value;
301 $is_in_val = true;
302 }
303 }
304
305 if ($string)
306 {
307 // New value if cols != value
308 $vals[(sizeof($cols) !== sizeof($vals)) ? $i : $i - 1] .= $string;
309 }
310
311 $vals = array(0 => $vals);
312 }
313
314 $inserts = $vals[0];
315 unset($vals);
316
317 foreach ($inserts as $key => $value)
318 {
319 if (!empty($value) && $value[0] === "'" && strlen($value) > 4002) // check to see if this thing is greater than the max + 'x2
320 {
321 $inserts[$key] = ':' . strtoupper($cols[$key]);
322 $array[$inserts[$key]] = str_replace("''", "'", substr($value, 1, -1));
323 }
324 }
325
326 $query = $regs[1] . '(' . $regs[2] . ') VALUES (' . implode(', ', $inserts) . ')';
327 }
328 }
329 else if (preg_match_all('/^(UPDATE [\\w_]++\\s+SET )([\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+)(?:,\\s*[\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+))*+)\\s+(WHERE.*)$/s', $query, $data, PREG_SET_ORDER))
330 {
331 if (strlen($data[0][2]) > 4000)
332 {
333 $update = $data[0][1];
334 $where = $data[0][3];
335 preg_match_all('/([\\w_]++)\\s*=\\s*(\'(?:[^\']++|\'\')*+\'|[\d-.]++)/', $data[0][2], $temp, PREG_SET_ORDER);
336 unset($data);
337
338 $cols = array();
339 foreach ($temp as $value)
340 {
341 if (!empty($value[2]) && $value[2][0] === "'" && strlen($value[2]) > 4002) // check to see if this thing is greater than the max + 'x2
342 {
343 $cols[] = $value[1] . '=:' . strtoupper($value[1]);
344 $array[$value[1]] = str_replace("''", "'", substr($value[2], 1, -1));
345 }
346 else
347 {
348 $cols[] = $value[1] . '=' . $value[2];
349 }
350 }
351
352 $query = $update . implode(', ', $cols) . ' ' . $where;
353 unset($cols);
354 }
355 }
356 }
357
358 switch (substr($query, 0, 6))
359 {
360 case 'DELETE':
361 if (preg_match('/^(DELETE FROM [\w_]++ WHERE)((?:\s*(?:AND|OR)?\s*[\w_]+\s*(?:(?:=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]+)|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]+,? ?)*+\)))*+)$/', $query, $regs))
362 {
363 $query = $regs[1] . $this->_rewrite_where($regs[2]);
364 unset($regs);
365 }
366 break;
367
368 case 'UPDATE':
369 if (preg_match('/^(UPDATE [\\w_]++\\s+SET [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++)(?:, [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++))*+\\s+WHERE)(.*)$/s', $query, $regs))
370 {
371 $query = $regs[1] . $this->_rewrite_where($regs[2]);
372 unset($regs);
373 }
374 break;
375
376 case 'SELECT':
377 $query = preg_replace_callback('/([\w_.]++)\s*(?:(=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]++|([\w_.]++))|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]++,? ?)*+\))/', array($this, '_rewrite_col_compare'), $query);
378 break;
379 }
380
381 $this->query_result = @ociparse($this->db_connect_id, $query);
382
383 foreach ($array as $key => $value)
384 {
385 @ocibindbyname($this->query_result, $key, $array[$key], -1);
386 }
387
388 $success = @ociexecute($this->query_result, OCI_DEFAULT);
389
390 if (!$success)
391 {
392 $this->sql_error($query);
393 $this->query_result = false;
394 }
395 else
396 {
397 if (!$in_transaction)
398 {
399 $this->sql_transaction('commit');
400 }
401 }
402
403 if (defined('DEBUG_EXTRA'))
404 {
405 $this->sql_report('stop', $query);
406 }
407
408 if ($cache_ttl && method_exists($cache, 'sql_save'))
409 {
410 $this->open_queries[(int) $this->query_result] = $this->query_result;
411 $cache->sql_save($query, $this->query_result, $cache_ttl);
412 }
413 else if (strpos($query, 'SELECT') === 0 && $this->query_result)
414 {
415 $this->open_queries[(int) $this->query_result] = $this->query_result;
416 }
417 }
418 else if (defined('DEBUG_EXTRA'))
419 {
420 $this->sql_report('fromcache', $query);
421 }
422 }
423 else
424 {
425 return false;
426 }
427
428 return $this->query_result;
429 }
430
431 /**
432 * Build LIMIT query
433 */
434 function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
435 {
436 $this->query_result = false;
437
438 $query = 'SELECT * FROM (SELECT /*+ FIRST_ROWS */ rownum AS xrownum, a.* FROM (' . $query . ') a WHERE rownum <= ' . ($offset + $total) . ') WHERE xrownum >= ' . $offset;
439
440 return $this->sql_query($query, $cache_ttl);
441 }
442
443 /**
444 * Return number of affected rows
445 */
446 function sql_affectedrows()
447 {
448 return ($this->query_result) ? @ocirowcount($this->query_result) : false;
449 }
450
451 /**
452 * Fetch current row
453 */
454 function sql_fetchrow($query_id = false)
455 {
456 global $cache;
457
458 if ($query_id === false)
459 {
460 $query_id = $this->query_result;
461 }
462
463 if (isset($cache->sql_rowset[$query_id]))
464 {
465 return $cache->sql_fetchrow($query_id);
466 }
467
468 if ($query_id !== false)
469 {
470 $row = array();
471 $result = @ocifetchinto($query_id, $row, OCI_ASSOC + OCI_RETURN_NULLS);
472
473 if (!$result || !$row)
474 {
475 return false;
476 }
477
478 $result_row = array();
479 foreach ($row as $key => $value)
480 {
481 // Oracle treats empty strings as null
482 if (is_null($value))
483 {
484 $value = '';
485 }
486
487 // OCI->CLOB?
488 if (is_object($value))
489 {
490 $value = $value->load();
491 }
492
493 $result_row[strtolower($key)] = $value;
494 }
495
496 return $result_row;
497 }
498
499 return false;
500 }
501
502 /**
503 * Seek to given row number
504 * rownum is zero-based
505 */
506 function sql_rowseek($rownum, &$query_id)
507 {
508 global $cache;
509
510 if ($query_id === false)
511 {
512 $query_id = $this->query_result;
513 }
514
515 if (isset($cache->sql_rowset[$query_id]))
516 {
517 return $cache->sql_rowseek($rownum, $query_id);
518 }
519
520 if ($query_id === false)
521 {
522 return false;
523 }
524
525 // Reset internal pointer
526 @ociexecute($query_id, OCI_DEFAULT);
527
528 // We do not fetch the row for rownum == 0 because then the next resultset would be the second row
529 for ($i = 0; $i < $rownum; $i++)
530 {
531 if (!$this->sql_fetchrow($query_id))
532 {
533 return false;
534 }
535 }
536
537 return true;
538 }
539
540 /**
541 * Get last inserted id after insert statement
542 */
543 function sql_nextid()
544 {
545 $query_id = $this->query_result;
546
547 if ($query_id !== false && $this->last_query_text != '')
548 {
549 if (preg_match('#^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)#is', $this->last_query_text, $tablename))
550 {
551 $query = 'SELECT ' . $tablename[1] . '_seq.currval FROM DUAL';
552 $stmt = @ociparse($this->db_connect_id, $query);
553 @ociexecute($stmt, OCI_DEFAULT);
554
555 $temp_result = @ocifetchinto($stmt, $temp_array, OCI_ASSOC + OCI_RETURN_NULLS);
556 @ocifreestatement($stmt);
557
558 if ($temp_result)
559 {
560 return $temp_array['CURRVAL'];
561 }
562 else
563 {
564 return false;
565 }
566 }
567 }
568
569 return false;
570 }
571
572 /**
573 * Free sql result
574 */
575 function sql_freeresult($query_id = false)
576 {
577 global $cache;
578
579 if ($query_id === false)
580 {
581 $query_id = $this->query_result;
582 }
583
584 if (isset($cache->sql_rowset[$query_id]))
585 {
586 return $cache->sql_freeresult($query_id);
587 }
588
589 if (isset($this->open_queries[(int) $query_id]))
590 {
591 unset($this->open_queries[(int) $query_id]);
592 return @ocifreestatement($query_id);
593 }
594
595 return false;
596 }
597
598 /**
599 * Escape string used in sql query
600 */
601 function sql_escape($msg)
602 {
603 return str_replace(array("'", "\0"), array("''", ''), $msg);
604 }
605
606 /**
607 * Build LIKE expression
608 * @access private
609 */
610 function _sql_like_expression($expression)
611 {
612 return $expression . " ESCAPE '\\'";
613 }
614
615 function _sql_custom_build($stage, $data)
616 {
617 return $data;
618 }
619
620 function _sql_bit_and($column_name, $bit, $compare = '')
621 {
622 return 'BITAND(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : '');
623 }
624
625 function _sql_bit_or($column_name, $bit, $compare = '')
626 {
627 return 'BITOR(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : '');
628 }
629
630 /**
631 * return sql error array
632 * @access private
633 */
634 function _sql_error()
635 {
636 $error = @ocierror();
637 $error = (!$error) ? @ocierror($this->query_result) : $error;
638 $error = (!$error) ? @ocierror($this->db_connect_id) : $error;
639
640 if ($error)
641 {
642 $this->last_error_result = $error;
643 }
644 else
645 {
646 $error = (isset($this->last_error_result) && $this->last_error_result) ? $this->last_error_result : array();
647 }
648
649 return $error;
650 }
651
652 /**
653 * Close sql connection
654 * @access private
655 */
656 function _sql_close()
657 {
658 return @ocilogoff($this->db_connect_id);
659 }
660
661 /**
662 * Build db-specific report
663 * @access private
664 */
665 function _sql_report($mode, $query = '')
666 {
667 switch ($mode)
668 {
669 case 'start':
670
671 $html_table = false;
672
673 // Grab a plan table, any will do
674 $sql = "SELECT table_name
675 FROM USER_TABLES
676 WHERE table_name LIKE '%PLAN_TABLE%'";
677 $stmt = ociparse($this->db_connect_id, $sql);
678 ociexecute($stmt);
679 $result = array();
680
681 if (ocifetchinto($stmt, $result, OCI_ASSOC + OCI_RETURN_NULLS))
682 {
683 $table = $result['TABLE_NAME'];
684
685 // This is the statement_id that will allow us to track the plan
686 $statement_id = substr(md5($query), 0, 30);
687
688 // Remove any stale plans
689 $stmt2 = ociparse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
690 ociexecute($stmt2);
691 ocifreestatement($stmt2);
692
693 // Explain the plan
694 $sql = "EXPLAIN PLAN
695 SET STATEMENT_ID = '$statement_id'
696 FOR $query";
697 $stmt2 = ociparse($this->db_connect_id, $sql);
698 ociexecute($stmt2);
699 ocifreestatement($stmt2);
700
701 // Get the data from the plan
702 $sql = "SELECT operation, options, object_name, object_type, cardinality, cost
703 FROM plan_table
704 START WITH id = 0 AND statement_id = '$statement_id'
705 CONNECT BY PRIOR id = parent_id
706 AND statement_id = '$statement_id'";
707 $stmt2 = ociparse($this->db_connect_id, $sql);
708 ociexecute($stmt2);
709
710 $row = array();
711 while (ocifetchinto($stmt2, $row, OCI_ASSOC + OCI_RETURN_NULLS))
712 {
713 $html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
714 }
715
716 ocifreestatement($stmt2);
717
718 // Remove the plan we just made, we delete them on request anyway
719 $stmt2 = ociparse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
720 ociexecute($stmt2);
721 ocifreestatement($stmt2);
722 }
723
724 ocifreestatement($stmt);
725
726 if ($html_table)
727 {
728 $this->html_hold .= '</table>';
729 }
730
731 break;
732
733 case 'fromcache':
734 $endtime = explode(' ', microtime());
735 $endtime = $endtime[0] + $endtime[1];
736
737 $result = @ociparse($this->db_connect_id, $query);
738 $success = @ociexecute($result, OCI_DEFAULT);
739 $row = array();
740
741 while (@ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS))
742 {
743 // Take the time spent on parsing rows into account
744 }
745 @ocifreestatement($result);
746
747 $splittime = explode(' ', microtime());
748 $splittime = $splittime[0] + $splittime[1];
749
750 $this->sql_report('record_fromcache', $query, $endtime, $splittime);
751
752 break;
753 }
754 }
755}
756
757?>
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