summaryrefslogtreecommitdiffstats
path: root/system/database/drivers/oci8/oci8_driver.php
blob: 6f8b21d750f00d333081c4a6f8335ee47c47eac4 (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
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2019 - 2022, CodeIgniter Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @copyright	Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
 * @license	https://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 1.4.1
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * oci8 Database Adapter Class
 *
 * Note: _DB is an extender class that the app controller
 * creates dynamically based on whether the query builder
 * class is being used or not.
 *
 * @package		CodeIgniter
 * @subpackage  Drivers
 * @category	Database
 * @author		EllisLab Dev Team
 * @link		https://codeigniter.com/userguide3/database/
 */

/**
 * oci8 Database Adapter Class
 *
 * This is a modification of the DB_driver class to
 * permit access to oracle databases
 *
 * @author	  Kelly McArdle
 */
class CI_DB_oci8_driver extends CI_DB {

	/**
	 * Database driver
	 *
	 * @var	string
	 */
	public $dbdriver = 'oci8';

	/**
	 * Commit mode flag
	 *
	 * @var	int
	 */
	public $commit_mode = OCI_COMMIT_ON_SUCCESS;

	/**
	 * Limit used flag
	 *
	 * If we use LIMIT, we'll add a field that will
	 * throw off num_fields later.
	 *
	 * @var	bool
	 */
	public $limit_used = FALSE;

	/**
	 * Error cache
	 *
	 * Cached error info about failed queries.
	 * Used so that statement IDs can be released immediately.
	 *
	 * @var	array|false
	 */
	protected $_error = FALSE;

	/**
	 * Affected rows
	 *
	 * Cached result of oci_num_rows().
	 * Used so that statement IDs can be released immediately.
	 *
	 * @var	int|false
	 */
	protected $_affected_rows = FALSE;

	// --------------------------------------------------------------------

	/**
	 * List of reserved identifiers
	 *
	 * Identifiers that must NOT be escaped.
	 *
	 * @var	string[]
	 */
	protected $_reserved_identifiers = array('*', 'rownum');

	/**
	 * ORDER BY random keyword
	 *
	 * @var	array
	 */
	protected $_random_keyword = array('ASC', 'ASC'); // not currently supported

	/**
	 * COUNT string
	 *
	 * @used-by	CI_DB_driver::count_all()
	 * @used-by	CI_DB_query_builder::count_all_results()
	 *
	 * @var	string
	 */
	protected $_count_string = 'SELECT COUNT(1) AS ';

	// --------------------------------------------------------------------

	/**
	 * Class constructor
	 *
	 * @param	array	$params
	 * @return	void
	 */
	public function __construct($params)
	{
		parent::__construct($params);

		$valid_dsns = array(
			'tns'	=> '/^\(DESCRIPTION=(\(.+\)){2,}\)$/', // TNS
			// Easy Connect string (Oracle 10g+)
			'ec'	=> '/^(\/\/)?[a-z0-9.:_-]+(:[1-9][0-9]{0,4})?(\/[a-z0-9$_]+)?(:[^\/])?(\/[a-z0-9$_]+)?$/i',
			'in'	=> '/^[a-z0-9$_]+$/i' // Instance name (defined in tnsnames.ora)
		);

		/* Space characters don't have any effect when actually
		 * connecting, but can be a hassle while validating the DSN.
		 */
		$this->dsn = str_replace(array("\n", "\r", "\t", ' '), '', $this->dsn);

		if ($this->dsn !== '')
		{
			foreach ($valid_dsns as $regexp)
			{
				if (preg_match($regexp, $this->dsn))
				{
					return;
				}
			}
		}

		// Legacy support for TNS in the hostname configuration field
		$this->hostname = str_replace(array("\n", "\r", "\t", ' '), '', $this->hostname);
		if (preg_match($valid_dsns['tns'], $this->hostname))
		{
			$this->dsn = $this->hostname;
			return;
		}
		elseif ($this->hostname !== '' && strpos($this->hostname, '/') === FALSE && strpos($this->hostname, ':') === FALSE
			&& (( ! empty($this->port) && ctype_digit($this->port)) OR $this->database !== ''))
		{
			/* If the hostname field isn't empty, doesn't contain
			 * ':' and/or '/' and if port and/or database aren't
			 * empty, then the hostname field is most likely indeed
			 * just a hostname. Therefore we'll try and build an
			 * Easy Connect string from these 3 settings, assuming
			 * that the database field is a service name.
			 */
			$this->dsn = $this->hostname
				.(( ! empty($this->port) && ctype_digit($this->port)) ? ':'.$this->port : '')
				.($this->database !== '' ? '/'.ltrim($this->database, '/') : '');

			if (preg_match($valid_dsns['ec'], $this->dsn))
			{
				return;
			}
		}

		/* At this point, we can only try and validate the hostname and
		 * database fields separately as DSNs.
		 */
		if (preg_match($valid_dsns['ec'], $this->hostname) OR preg_match($valid_dsns['in'], $this->hostname))
		{
			$this->dsn = $this->hostname;
			return;
		}

		$this->database = str_replace(array("\n", "\r", "\t", ' '), '', $this->database);
		foreach ($valid_dsns as $regexp)
		{
			if (preg_match($regexp, $this->database))
			{
				return;
			}
		}

		/* Well - OK, an empty string should work as well.
		 * PHP will try to use environment variables to
		 * determine which Oracle instance to connect to.
		 */
		$this->dsn = '';
	}

	// --------------------------------------------------------------------

	/**
	 * Non-persistent database connection
	 *
	 * @param	bool	$persistent
	 * @return	resource
	 */
	public function db_connect($persistent = FALSE)
	{
		$func = ($persistent === TRUE) ? 'oci_pconnect' : 'oci_connect';
		return empty($this->char_set)
			? $func($this->username, $this->password, $this->dsn)
			: $func($this->username, $this->password, $this->dsn, $this->char_set);
	}

	// --------------------------------------------------------------------

	/**
	 * Database version number
	 *
	 * @return	string
	 */
	public function version()
	{
		if (isset($this->data_cache['version']))
		{
			return $this->data_cache['version'];
		}

		if ( ! $this->conn_id OR ($version_string = oci_server_version($this->conn_id)) === FALSE)
		{
			return FALSE;
		}
		elseif (preg_match('#Release\s(\d+(?:\.\d+)+)#', $version_string, $match))
		{
			return $this->data_cache['version'] = $match[1];
		}

		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Execute the query
	 *
	 * @param	string	$sql	an SQL query
	 * @return	resource
	 */
	protected function _execute($sql)
	{
		/* Oracle must parse the query before it is run. All of the actions with
		 * the query are based on the statement id returned by oci_parse().
		 */
		$this->result_id = oci_parse($this->conn_id, $sql);
		oci_set_prefetch($this->result_id, 1000);
		$result = oci_execute($this->result_id, $this->commit_mode);
		$this->_error = oci_error($this->result_id);
		$this->is_write_type($sql) && $this->_affected_rows = oci_num_rows($this->result_id);

		if ($this->is_write_type($sql) OR $result === FALSE)
		{
			oci_free_statement($this->result_id);
			return $result;
		}

		return $this->result_id;
	}

	// --------------------------------------------------------------------

	/**
	 * Begin Transaction
	 *
	 * @return	bool
	 */
	protected function _trans_begin()
	{
		$this->commit_mode = OCI_NO_AUTO_COMMIT;
		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Commit Transaction
	 *
	 * @return	bool
	 */
	protected function _trans_commit()
	{
		$this->commit_mode = OCI_COMMIT_ON_SUCCESS;

		return oci_commit($this->conn_id);
	}

	// --------------------------------------------------------------------

	/**
	 * Rollback Transaction
	 *
	 * @return	bool
	 */
	protected function _trans_rollback()
	{
		$this->commit_mode = OCI_COMMIT_ON_SUCCESS;
		return oci_rollback($this->conn_id);
	}

	// --------------------------------------------------------------------

	/**
	 * Affected Rows
	 *
	 * @return	int
	 */
	public function affected_rows()
	{
		return $this->_affected_rows;
	}

	// --------------------------------------------------------------------

	/**
	 * Insert ID
	 *
	 * @return	int
	 */
	public function insert_id()
	{
		// not supported in oracle
		return $this->display_error('db_unsupported_function');
	}

	// --------------------------------------------------------------------

	/**
	 * Show table query
	 *
	 * Generates a platform-specific query string so that the table names can be fetched
	 *
	 * @param	bool	$prefix_limit
	 * @return	string
	 */
	protected function _list_tables($prefix_limit = FALSE)
	{
		$sql = 'SELECT "TABLE_NAME" FROM "ALL_TABLES"';

		if ($prefix_limit !== FALSE && $this->dbprefix !== '')
		{
			return $sql.' WHERE "TABLE_NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' "
				.sprintf($this->_like_escape_str, $this->_like_escape_chr);
		}

		return $sql;
	}

	// --------------------------------------------------------------------

	/**
	 * Show column query
	 *
	 * Generates a platform-specific query string so that the column names can be fetched
	 *
	 * @param	string	$table
	 * @return	string
	 */
	protected function _list_columns($table = '')
	{
		if (strpos($table, '.') !== FALSE)
		{
			sscanf($table, '%[^.].%s', $owner, $table);
		}
		else
		{
			$owner = $this->username;
		}

		return 'SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS
			WHERE UPPER(OWNER) = '.$this->escape(strtoupper($owner)).'
				AND UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
	}

	// --------------------------------------------------------------------

	/**
	 * Returns an object with field data
	 *
	 * @param	string	$table
	 * @return	array
	 */
	public function field_data($table)
	{
		if (strpos($table, '.') !== FALSE)
		{
			sscanf($table, '%[^.].%s', $owner, $table);
		}
		else
		{
			$owner = $this->username;
		}

		$sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHAR_LENGTH, DATA_PRECISION, DATA_LENGTH, DATA_DEFAULT, NULLABLE
			FROM ALL_TAB_COLUMNS
			WHERE UPPER(OWNER) = '.$this->escape(strtoupper($owner)).'
				AND UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));

		if (($query = $this->query($sql)) === FALSE)
		{
			return FALSE;
		}
		$query = $query->result_object();

		$retval = array();
		for ($i = 0, $c = count($query); $i < $c; $i++)
		{
			$retval[$i]			= new stdClass();
			$retval[$i]->name		= $query[$i]->COLUMN_NAME;
			$retval[$i]->type		= $query[$i]->DATA_TYPE;

			$length = ($query[$i]->CHAR_LENGTH > 0)
				? $query[$i]->CHAR_LENGTH : $query[$i]->DATA_PRECISION;
			if ($length === NULL)
			{
				$length = $query[$i]->DATA_LENGTH;
			}
			$retval[$i]->max_length		= $length;

			$default = $query[$i]->DATA_DEFAULT;
			if ($default === NULL && $query[$i]->NULLABLE === 'N')
			{
				$default = '';
			}
			$retval[$i]->default = $default;
		}

		return $retval;
	}

	// --------------------------------------------------------------------

	/**
	 * Error
	 *
	 * Returns an array containing code and message of the last
	 * database error that has occurred.
	 *
	 * @return	array
	 */
	public function error()
	{
		if ( ! empty($this->_error))
		{
			return $this->_error;
		}

		// oci_error() returns an array that already contains
		// 'code' and 'message' keys, but it can return false
		// if there was no error ....
		if (is_resource($this->conn_id))
		{
			$error = oci_error($this->conn_id);
		}
		else
		{
			$error = oci_error();
		}

		return is_array($error)
			? $error
			: array('code' => '', 'message' => '');
	}

	// --------------------------------------------------------------------

	/**
	 * Insert batch statement
	 *
	 * Generates a platform-specific insert string from the supplied data
	 *
	 * @param	string	$table	Table name
	 * @param	array	$keys	INSERT keys
	 * @param 	array	$values	INSERT values
	 * @return	string
	 */
	protected function _insert_batch($table, $keys, $values)
	{
		$keys = implode(', ', $keys);
		$sql = "INSERT ALL\n";

		for ($i = 0, $c = count($values); $i < $c; $i++)
		{
			$sql .= '	INTO '.$table.' ('.$keys.') VALUES '.$values[$i]."\n";
		}

		return $sql.'SELECT * FROM dual';
	}

	// --------------------------------------------------------------------

	/**
	 * Truncate statement
	 *
	 * Generates a platform-specific truncate string from the supplied data
	 *
	 * If the database does not support the TRUNCATE statement,
	 * then this method maps to 'DELETE FROM table'
	 *
	 * @param	string	$table
	 * @return	string
	 */
	protected function _truncate($table)
	{
		return 'TRUNCATE TABLE '.$table;
	}

	// --------------------------------------------------------------------

	/**
	 * Delete statement
	 *
	 * Generates a platform-specific delete string from the supplied data
	 *
	 * @param	string	$table
	 * @return	string
	 */
	protected function _delete($table)
	{
		if ($this->qb_limit)
		{
			$this->where('rownum <= ',$this->qb_limit, FALSE);
			$this->qb_limit = FALSE;
		}

		return parent::_delete($table);
	}

	// --------------------------------------------------------------------

	/**
	 * LIMIT
	 *
	 * Generates a platform-specific LIMIT clause
	 *
	 * @param	string	$sql	SQL Query
	 * @return	string
	 */
	protected function _limit($sql)
	{
		if (version_compare($this->version(), '12.1', '>='))
		{
			// OFFSET-FETCH can be used only with the ORDER BY clause
			empty($this->qb_orderby) && $sql .= ' ORDER BY 1';

			return $sql.' OFFSET '.(int) $this->qb_offset.' ROWS FETCH NEXT '.$this->qb_limit.' ROWS ONLY';
		}

		$this->limit_used = TRUE;
		return 'SELECT * FROM (SELECT inner_query.*, rownum rnum FROM ('.$sql.') inner_query WHERE rownum < '.($this->qb_offset + $this->qb_limit + 1).')'
			.($this->qb_offset ? ' WHERE rnum >= '.($this->qb_offset + 1) : '');
	}

	// --------------------------------------------------------------------

	/**
	 * Close DB Connection
	 *
	 * @return	void
	 */
	protected function _close()
	{
		if (is_resource($this->result_id))
		{
			oci_free_statement($this->result_id);
		}

		oci_close($this->conn_id);
	}

	// --------------------------------------------------------------------

	/**
	 * We need to reset our $limit_used hack flag, so it doesn't propagate
	 * to subsequent queries.
	 *
	 * @return	void
	 */
	protected function _reset_select()
	{
		$this->limit_used = FALSE;
		parent::_reset_select();
	}
}