summaryrefslogtreecommitdiff
path: root/program/lib/Roundcube/rcube_db_oci8.php
blob: 2f94c182579901eefe72297099d44a27e223ad0d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
<?php

/**
 +-----------------------------------------------------------------------+
 | This file is part of the Roundcube Webmail client                     |
 | Copyright (C) 2011-2014, Kolab Systems AG                             |
 |                                                                       |
 | Licensed under the GNU General Public License version 3 or            |
 | any later version with exceptions for skins & plugins.                |
 | See the README file for a full license statement.                     |
 |                                                                       |
 | PURPOSE:                                                              |
 |   Database wrapper class that implements database functions           |
 |   for Oracle database using OCI8 extension                            |
 +-----------------------------------------------------------------------+
 | Author: Aleksander Machniak <machniak@kolabsys.com>                   |
 +-----------------------------------------------------------------------+
*/

/**
 * Database independent query interface
 *
 * @package    Framework
 * @subpackage Database
 */
class rcube_db_oci8 extends rcube_db
{
    public $db_provider = 'oracle';


    /**
     * Create connection instance
     */
    protected function conn_create($dsn)
    {
        // Get database specific connection options
        $dsn_options = $this->dsn_options($dsn);

        $function = $this->db_pconn ? 'oci_pconnect' : 'oci_connect';

        if (!function_exists($function)) {
            $this->db_error     = true;
            $this->db_error_msg = 'OCI8 extension not loaded. See http://php.net/manual/en/book.oci8.php';

            rcube::raise_error(array('code' => 500, 'type' => 'db',
                'line' => __LINE__, 'file' => __FILE__,
                'message' => $this->db_error_msg), true, false);

            return;
        }

        // connect
        $dbh = @$function($dsn['username'], $dsn['password'], $dsn_options['database'], $dsn_options['charset']);

        if (!$dbh) {
            $error              = oci_error();
            $this->db_error     = true;
            $this->db_error_msg = $error['message'];

            rcube::raise_error(array('code' => 500, 'type' => 'db',
                'line' => __LINE__, 'file' => __FILE__,
                'message' => $this->db_error_msg), true, false);

            return;
        }

        // configure session
        $this->conn_configure($dsn, $dbh);

        return $dbh;
    }

    /**
     * Driver-specific configuration of database connection
     *
     * @param array $dsn DSN for DB connections
     * @param PDO   $dbh Connection handler
     */
    protected function conn_configure($dsn, $dbh)
    {
        $init_queries = array(
            "ALTER SESSION SET nls_date_format = 'YYYY-MM-DD'",
            "ALTER SESSION SET nls_timestamp_format = 'YYYY-MM-DD HH24:MI:SS'",
        );

        foreach ($init_queries as $query) {
            $stmt = oci_parse($dbh, $query);
            oci_execute($stmt);
        }
    }

    /**
     * Connection state checker
     *
     * @return boolean True if in connected state
     */
    public function is_connected()
    {
        return empty($this->dbh) ? false : $this->db_connected;
    }

    /**
     * Execute a SQL query with limits
     *
     * @param string $query   SQL query to execute
     * @param int    $offset  Offset for LIMIT statement
     * @param int    $numrows Number of rows for LIMIT statement
     * @param array  $params  Values to be inserted in query
     *
     * @return PDOStatement|bool Query handle or False on error
     */
    protected function _query($query, $offset, $numrows, $params)
    {
        $query = ltrim($query);

        $this->db_connect($this->dsn_select($query), true);

        // check connection before proceeding
        if (!$this->is_connected()) {
            return $this->last_result = false;
        }

        if ($numrows || $offset) {
            $query = $this->set_limit($query, $numrows, $offset);
        }

        // replace self::DEFAULT_QUOTE with driver-specific quoting
        $query = $this->query_parse($query);

        // Because in Roundcube we mostly use queries that are
        // executed only once, we will not use prepared queries
        $pos  = 0;
        $idx  = 0;
        $args = array();

        if (count($params)) {
            while ($pos = strpos($query, '?', $pos)) {
                if ($query[$pos+1] == '?') {  // skip escaped '?'
                    $pos += 2;
                }
                else {
                    $val = $this->quote($params[$idx++]);

                    // long strings are not allowed inline, need to be parametrized
                    if (strlen($val) > 4000) {
                        $key = ':param' . (count($args) + 1);
                        $args[$key] = $params[$idx-1];
                        $val = $key;
                    }

                    unset($params[$idx-1]);
                    $query = substr_replace($query, $val, $pos, 1);
                    $pos += strlen($val);
                }
            }
        }

        // replace escaped '?' back to normal, see self::quote()
        $query = str_replace('??', '?', $query);
        $query = rtrim($query, " \t\n\r\0\x0B;");

        // log query
        $this->debug($query);

        // destroy reference to previous result
        $this->last_result  = null;
        $this->db_error_msg = null;

        // prepare query
        $result = @oci_parse($this->dbh, $query);
        $mode   = $this->in_transaction ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;

        if ($result) {
            foreach ($args as $param => $arg) {
                oci_bind_by_name($result, $param, $args[$param], -1, SQLT_LNG);
            }
        }

        // execute query
        if (!$result || !@oci_execute($result, $mode)) {
            $result = $this->handle_error($query, $result);
        }

        return $this->last_result = $result;
    }

    /**
     * Helper method to handle DB errors.
     * This by default logs the error but could be overriden by a driver implementation
     *
     * @param string Query that triggered the error
     * @return mixed Result to be stored and returned
     */
    protected function handle_error($query, $result = null)
    {
        $error = oci_error(is_resource($result) ? $result : $this->dbh);

        // @TODO: Find error codes for key errors
        if (empty($this->options['ignore_key_errors']) || !in_array($error['code'], array('23000', '23505'))) {
            $this->db_error = true;
            $this->db_error_msg = sprintf('[%s] %s', $error['code'], $error['message']);

            rcube::raise_error(array('code' => 500, 'type' => 'db',
                'line' => __LINE__, 'file' => __FILE__,
                'message' => $this->db_error_msg . " (SQL Query: $query)"
                ), true, false);
        }

        return false;
    }

    /**
     * Get last inserted record ID
     *
     * @param string $table Table name (to find the incremented sequence)
     *
     * @return mixed ID or false on failure
     */
    public function insert_id($table = null)
    {
        if (!$this->db_connected || $this->db_mode == 'r' || empty($table)) {
            return false;
        }

        $sequence = $this->quote_identifier($this->sequence_name($table));
        $result   = $this->query("SELECT $sequence.currval FROM dual");
        $result   = $this->fetch_array($result);

        return $result[0] ?: false;
    }

    /**
     * Get number of affected rows for the last query
     *
     * @param mixed $result Optional query handle
     *
     * @return int Number of (matching) rows
     */
    public function affected_rows($result = null)
    {
        if ($result || ($result === null && ($result = $this->last_result))) {
            return oci_num_rows($result);
        }

        return 0;
    }

    /**
     * Get number of rows for a SQL query
     * If no query handle is specified, the last query will be taken as reference
     *
     * @param mixed $result Optional query handle
     * @return mixed   Number of rows or false on failure
     * @deprecated This method shows very poor performance and should be avoided.
     */
    public function num_rows($result = null)
    {
        // not implemented
        return false;
    }

    /**
     * Get an associative array for one row
     * If no query handle is specified, the last query will be taken as reference
     *
     * @param mixed $result Optional query handle
     *
     * @return mixed Array with col values or false on failure
     */
    public function fetch_assoc($result = null)
    {
        return $this->_fetch_row($result, OCI_ASSOC);
    }

    /**
     * Get an index array for one row
     * If no query handle is specified, the last query will be taken as reference
     *
     * @param mixed $result Optional query handle
     *
     * @return mixed Array with col values or false on failure
     */
    public function fetch_array($result = null)
    {
        return $this->_fetch_row($result, OCI_NUM);
    }

    /**
     * Get col values for a result row
     *
     * @param mixed $result Optional query handle
     * @param int   $mode   Fetch mode identifier
     *
     * @return mixed Array with col values or false on failure
     */
    protected function _fetch_row($result, $mode)
    {
        if ($result || ($result === null && ($result = $this->last_result))) {
            return oci_fetch_array($result, $mode + OCI_RETURN_NULLS + OCI_RETURN_LOBS);
        }

        return false;
    }

    /**
     * Formats input so it can be safely used in a query
     * PDO_OCI does not implement quote() method
     *
     * @param mixed  $input Value to quote
     * @param string $type  Type of data (integer, bool, ident)
     *
     * @return string Quoted/converted string for use in query
     */
    public function quote($input, $type = null)
    {
        // handle int directly for better performance
        if ($type == 'integer' || $type == 'int') {
            return intval($input);
        }

        if (is_null($input)) {
            return 'NULL';
        }

        if ($type == 'ident') {
            return $this->quote_identifier($input);
        }

        switch ($type) {
        case 'bool':
        case 'integer':
            return intval($input);
        default:
            return "'" . strtr($input, array(
                    '?' => '??',
                    "'" => "''",
                    rcube_db::DEFAULT_QUOTE => rcube_db::DEFAULT_QUOTE . rcube_db::DEFAULT_QUOTE
            )) . "'";
        }
    }

    /**
     * Return correct name for a specific database sequence
     *
     * @param string $table Table name
     *
     * @return string Translated sequence name
     */
    protected function sequence_name($table)
    {
        // Note: we support only one sequence per table
        // Note: The sequence name must be <table_name>_seq
        $sequence = $table . '_seq';

        // modify sequence name if prefix is configured
        if ($prefix = $this->options['table_prefix']) {
            return $prefix . $sequence;
        }

        return $sequence;
    }

    /**
     * Return SQL statement for case insensitive LIKE
     *
     * @param string $column Field name
     * @param string $value  Search value
     *
     * @return string SQL statement to use in query
     */
    public function ilike($column, $value)
    {
        return 'UPPER(' . $this->quote_identifier($column) . ') LIKE UPPER(' . $this->quote($value) . ')';
    }

    /**
     * Return SQL function for current time and date
     *
     * @param int $interval Optional interval (in seconds) to add/subtract
     *
     * @return string SQL function to use in query
     */
    public function now($interval = 0)
    {
        if ($interval) {
            $interval = intval($interval);
            return "current_timestamp + INTERVAL '$interval' SECOND";
        }

        return "current_timestamp";
    }

    /**
     * Return SQL statement to convert a field value into a unix timestamp
     *
     * @param string $field Field name
     *
     * @return string SQL statement to use in query
     * @deprecated
     */
    public function unixtimestamp($field)
    {
        return "(($field - to_date('1970-01-01','YYYY-MM-DD')) * 60 * 60 * 24)";
    }

    /**
     * Adds TOP (LIMIT,OFFSET) clause to the query
     *
     * @param string $query  SQL query
     * @param int    $limit  Number of rows
     * @param int    $offset Offset
     *
     * @return string SQL query
     */
    protected function set_limit($query, $limit = 0, $offset = 0)
    {
        $limit  = intval($limit);
        $offset = intval($offset);
        $end    = $offset + $limit;

        // @TODO: Oracle 12g has better OFFSET support

        if (!$offset) {
            $query = "SELECT * FROM ($query) a WHERE rownum <= $end";
        }
        else {
            $query = "SELECT * FROM (SELECT a.*, rownum as rn FROM ($query) a WHERE rownum <= $end) b WHERE rn > $offset";
        }

        return $query;
    }

    /**
     * Parse SQL file and fix table names according to table prefix
     */
    protected function fix_table_names($sql)
    {
        if (!$this->options['table_prefix']) {
            return $sql;
        }

        $sql = parent::fix_table_names($sql);

        // replace sequence names, and other Oracle-specific commands
        $sql = preg_replace_callback('/((SEQUENCE ["]?)([^" \r\n]+)/',
            array($this, 'fix_table_names_callback'),
            $sql
        );

        $sql = preg_replace_callback(
            '/([ \r\n]+["]?)([^"\' \r\n\.]+)(["]?\.nextval)/',
            array($this, 'fix_table_names_seq_callback'),
            $sql
        );

        return $sql;
    }

    /**
     * Preg_replace callback for fix_table_names()
     */
    protected function fix_table_names_seq_callback($matches)
    {
        return $matches[1] . $this->options['table_prefix'] . $matches[2] . $matches[3];
    }

    /**
     * Returns connection options from DSN array
     */
    protected function dsn_options($dsn)
    {
        $params = array();

        if ($dsn['hostspec']) {
            $host = $dsn['hostspec'];
            if ($dsn['port']) {
                $host .= ':' . $dsn['port'];
            }

            $params['database'] = $host . '/' . $dsn['database'];
        }

        $params['charset'] = 'UTF8';

        return $params;
    }

    /**
     * Execute the given SQL script
     *
     * @param string SQL queries to execute
     *
     * @return boolen True on success, False on error
     */
    public function exec_script($sql)
    {
        $sql  = $this->fix_table_names($sql);
        $buff = '';
        $body = false;

        foreach (explode("\n", $sql) as $line) {
            $tok = strtolower(trim($line));
            if (preg_match('/^--/', $line) || $tok == '') {
                continue;
            }

            $buff .= $line . "\n";

            // detect PL/SQL function bodies, don't break on semicolon
            if ($body && $tok == 'end;') {
                $body = false;
            }
            else if (!$body && $tok == 'begin') {
                $body = true;
            }

            if (!$body && substr($tok, -1) == ';') {
                $this->query($buff);
                $buff = '';
                if ($this->db_error) {
                    break;
                }
            }
        }

        return !$this->db_error;
    }

    /**
     * Start transaction
     *
     * @return bool True on success, False on failure
     */
    public function startTransaction()
    {
        $this->db_connect('w', true);

        // check connection before proceeding
        if (!$this->is_connected()) {
            return $this->last_result = false;
        }

        $this->debug('BEGIN TRANSACTION');

        return $this->last_result = $this->in_transaction = true;
    }

    /**
     * Commit transaction
     *
     * @return bool True on success, False on failure
     */
    public function endTransaction()
    {
        $this->db_connect('w', true);

        // check connection before proceeding
        if (!$this->is_connected()) {
            return $this->last_result = false;
        }

        $this->debug('COMMIT TRANSACTION');

        if ($result = @oci_commit($this->dbh)) {
            $this->in_transaction = true;
        }
        else {
            $this->handle_error('COMMIT');
        }

        return $this->last_result = $result;
    }

    /**
     * Rollback transaction
     *
     * @return bool True on success, False on failure
     */
    public function rollbackTransaction()
    {
        $this->db_connect('w', true);

        // check connection before proceeding
        if (!$this->is_connected()) {
            return $this->last_result = false;
        }

        $this->debug('ROLLBACK TRANSACTION');

        if ($result = @oci_rollback($this->dbh)) {
            $this->in_transaction = false;
        }
        else {
            $this->handle_error('ROLLBACK');
        }

        return $this->last_result = $this->dbh->rollBack();
    }
}