summaryrefslogtreecommitdiffstats
path: root/system/database/drivers/pdo/pdo_driver.php
blob: 3d54126000fb27c0f13a0a6235b2950730e2f68b (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
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * NOTICE OF LICENSE
 * 
 * Licensed under the Open Software License version 3.0
 * 
 * This source file is subject to the Open Software License (OSL 3.0) that is
 * bundled with this package in the files license.txt / license.rst.  It is
 * also available through the world wide web at this URL:
 * http://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to obtain it
 * through the world wide web, please send an email to
 * licensing@ellislab.com so we can send you a copy immediately.
 *
 * @package		CodeIgniter
 * @author		EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc. (http://ellislab.com/)
 * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 * @link		http://codeigniter.com
 * @since		Version 2.1.0
 * @filesource
 */

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

/**
 * PDO Database Adapter Class
 *
 * Note: _DB is an extender class that the app controller
 * creates dynamically based on whether the active record
 * class is being used or not.
 *
 * @package		CodeIgniter
 * @subpackage	Drivers
 * @category	Database
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_pdo_driver extends CI_DB {

	var $dbdriver = 'pdo';
	var $pdo_driver = '';
	var $dsn = '';

	// the character used to excape - not necessary for PDO
	var $_escape_char = '';
	var $_like_escape_str;
	var $_like_escape_chr;
	

	/**
	 * The syntax to count rows is slightly different across different
	 * database engines, so this string appears in each driver and is
	 * used for the count_all() and count_all_results() functions.
	 */
	var $_count_string = "SELECT COUNT(*) AS ";
	var $_random_keyword;
	
	var $options = array();

	function __construct($params)
	{
		parent::__construct($params);
		
		$host = explode(":", $this->hostname);
		$this->pdo_driver = $host[0];
		
		$this->dsn = $this->hostname;
		
		switch($this->pdo_driver)
		{
			case "mysql":
				$this->_like_escape_str = '';
				$this->_like_escape_chr = '';
				
				//Prior to this version, the charset can't be set in the dsn
				if(is_php('5.3.6'))
				{
					$this->dsn .= ";charset={$this->char_set}";
				}
				
				//Set the charset with the connection options
				$this->options['PDO::MYSQL_ATTR_INIT_COMMAND'] = "SET NAMES {$this->char_set}";
			break;
			
			case "odbc":
				$this->_like_escape_str = " {escape '%s'} ";
				$this->_like_escape_chr = '!';
			break;
			
			case "sqlite":
				
			break;
			
			default:
				$this->_like_escape_str = " ESCAPE '%s' ";
				$this->_like_escape_chr = '!';
			break;
		}
		
		$this->dsn .= ";dbname=".$this->database;
		$this->trans_enabled = FALSE;
		$this->_random_keyword = ' RND('.time().')'; // database specific random keyword
	}

	/**
	 * Non-persistent database connection
	 *
	 * @access	private called by the base class
	 * @return	resource
	 */
	function db_connect()
	{
		$this->options['PDO::ATTR_ERRMODE'] = PDO::ERRMODE_SILENT;
		
		return new PDO($this->dsn, $this->username, $this->password, $this->options);
	}

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

	/**
	 * Persistent database connection
	 *
	 * @access	private called by the base class
	 * @return	resource
	 */
	function db_pconnect()
	{
		$this->options['PDO::ATTR_ERRMODE'] = PDO::ERRMODE_SILENT;
		$this->options['PDO::ATTR_PERSISTENT'] = TRUE;
	
		return new PDO($this->dsn, $this->username, $this->password, $this->options);
	}

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

	/**
	 * Reconnect
	 *
	 * Keep / reestablish the db connection if no queries have been
	 * sent for a length of time exceeding the server's idle timeout
	 *
	 * @access	public
	 * @return	void
	 */
	function reconnect()
	{
		if ($this->db->db_debug)
		{
			return $this->db->display_error('db_unsuported_feature');
		}
		return FALSE;
	}

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

	/**
	 * Select the database
	 *
	 * @access	private called by the base class
	 * @return	resource
	 */
	function db_select()
	{
		// Not needed for PDO
		return TRUE;
	}

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

	/**
	 * Set client character set
	 *
	 * @access	public
	 * @param	string
	 * @param	string
	 * @return	resource
	 */
	function db_set_charset($charset, $collation)
	{
		// @todo - add support if needed
		return TRUE;
	}

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

	/**
	 * Version number query string
	 *
	 * @access	public
	 * @return	string
	 */
	function _version()
	{
		return $this->conn_id->getAttribute(PDO::ATTR_CLIENT_VERSION);
	}

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

	/**
	 * Execute the query
	 *
	 * @access	private called by the base class
	 * @param	string	an SQL query
	 * @return	object
	 */
	function _execute($sql)
	{
		$sql = $this->_prep_query($sql);
		$result_id = $this->conn_id->query($sql);
		
		if (is_object($result_id))
		{
			$this->affect_rows = $result_id->rowCount();
		}
		else
		{
			$this->affect_rows = 0;
		}
		
		return $result_id;
	}

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

	/**
	 * Prep the query
	 *
	 * If needed, each database adapter can prep the query string
	 *
	 * @access	private called by execute()
	 * @param	string	an SQL query
	 * @return	string
	 */
	function _prep_query($sql)
	{
		return $sql;
	}

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

	/**
	 * Begin Transaction
	 *
	 * @access	public
	 * @return	bool
	 */
	function trans_begin($test_mode = FALSE)
	{
		if ( ! $this->trans_enabled)
		{
			return TRUE;
		}

		// When transactions are nested we only begin/commit/rollback the outermost ones
		if ($this->_trans_depth > 0)
		{
			return TRUE;
		}

		// Reset the transaction failure flag.
		// If the $test_mode flag is set to TRUE transactions will be rolled back
		// even if the queries produce a successful result.
		$this->_trans_failure = (bool) ($test_mode === TRUE);

		return $this->conn_id->beginTransaction();
	}

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

	/**
	 * Commit Transaction
	 *
	 * @access	public
	 * @return	bool
	 */
	function trans_commit()
	{
		if ( ! $this->trans_enabled)
		{
			return TRUE;
		}

		// When transactions are nested we only begin/commit/rollback the outermost ones
		if ($this->_trans_depth > 0)
		{
			return TRUE;
		}

		$ret = $this->conn->commit();
		return $ret;
	}

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

	/**
	 * Rollback Transaction
	 *
	 * @access	public
	 * @return	bool
	 */
	function trans_rollback()
	{
		if ( ! $this->trans_enabled)
		{
			return TRUE;
		}

		// When transactions are nested we only begin/commit/rollback the outermost ones
		if ($this->_trans_depth > 0)
		{
			return TRUE;
		}

		$ret = $this->conn_id->rollBack();
		return $ret;
	}

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

	/**
	 * Escape String
	 *
	 * @access	public
	 * @param	string
	 * @param	bool	whether or not the string will be used in a LIKE condition
	 * @return	string
	 */
	function escape_str($str, $like = FALSE)
	{
		if (is_array($str))
		{
			foreach ($str as $key => $val)
			{
				$str[$key] = $this->escape_str($val, $like);
			}

			return $str;
		}
		
		//Escape the string
		$str = $this->conn_id->quote($str);
		
		//If there are duplicated quotes, trim them away
		if (strpos($str, "'") === 0)
		{
			$str = substr($str, 1, -1);
		}
		
		// escape LIKE condition wildcards
		if ($like === TRUE)
		{
			$str = str_replace(	array('%', '_', $this->_like_escape_chr),
								array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
								$str);
		}

		return $str;
	}

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

	/**
	 * Affected Rows
	 *
	 * @access	public
	 * @return	integer
	 */
	function affected_rows()
	{
		return $this->affect_rows;
	}

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

	/**
	 * Insert ID
	 * 
	 * @access	public
	 * @return	integer
	 */
	function insert_id($name=NULL)
	{
		//Convenience method for postgres insertid
		if ($this->pdo_driver === "pgsql")
		{
			$v = $this->_version();

			$table	= func_num_args() > 0 ? func_get_arg(0) : NULL;

			if ($table == NULL && $v >= '8.1')
			{
				$sql='SELECT LASTVAL() as ins_id';
			}
			$query = $this->query($sql);
			$row = $query->row();
			return $row->ins_id;
		}
		else
		{
			return $this->conn_id->lastInsertId($name);
		}
	}

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

	/**
	 * "Count All" query
	 *
	 * Generates a platform-specific query string that counts all records in
	 * the specified database
	 *
	 * @access	public
	 * @param	string
	 * @return	string
	 */
	function count_all($table = '')
	{
		if ($table == '')
		{
			return 0;
		}

		$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows') . " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));

		if ($query->num_rows() == 0)
		{
			return 0;
		}

		$row = $query->row();
		$this->_reset_select();
		return (int) $row->numrows;
	}

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

	/**
	 * Show table query
	 *
	 * Generates a platform-specific query string so that the table names can be fetched
	 *
	 * @access	private
	 * @param	boolean
	 * @return	string
	 */
	function _list_tables($prefix_limit = FALSE)
	{
		$sql = "SHOW TABLES FROM `".$this->database."`";

		if ($prefix_limit !== FALSE AND $this->dbprefix != '')
		{
			//$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
			return FALSE; // not currently supported
		}

		return $sql;
	}

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

	/**
	 * Show column query
	 *
	 * Generates a platform-specific query string so that the column names can be fetched
	 *
	 * @access	public
	 * @param	string	the table name
	 * @return	string
	 */
	function _list_columns($table = '')
	{
		return "SHOW COLUMNS FROM ".$table;
	}

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

	/**
	 * Field data query
	 *
	 * Generates a platform-specific query so that the column data can be retrieved
	 *
	 * @access	public
	 * @param	string	the table name
	 * @return	object
	 */
	function _field_data($table)
	{
		return "SELECT TOP 1 FROM ".$table;
	}

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

	/**
	 * The error message string
	 *
	 * @access	private
	 * @return	string
	 */
	function _error_message()
	{
		$error_array = $this->conn_id->errorInfo();
		return $error_array[2];
	}

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

	/**
	 * The error message number
	 *
	 * @access	private
	 * @return	integer
	 */
	function _error_number()
	{
		return $this->conn_id->errorCode();
	}

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

	/**
	 * Escape the SQL Identifiers
	 *
	 * This function escapes column and table names
	 *
	 * @access	private
	 * @param	string
	 * @return	string
	 */
	function _escape_identifiers($item)
	{
		if ($this->_escape_char == '')
		{
			return $item;
		}

		foreach ($this->_reserved_identifiers as $id)
		{
			if (strpos($item, '.'.$id) !== FALSE)
			{
				$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);

				// remove duplicates if the user already included the escape
				return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
			}
		}

		if (strpos($item, '.') !== FALSE)
		{
			$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;
			
		}
		else
		{
			$str = $this->_escape_char.$item.$this->_escape_char;
		}

		// remove duplicates if the user already included the escape
		return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
	}

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

	/**
	 * From Tables
	 *
	 * This function implicitly groups FROM tables so there is no confusion
	 * about operator precedence in harmony with SQL standards
	 *
	 * @access	public
	 * @param	type
	 * @return	type
	 */
	function _from_tables($tables)
	{
		if ( ! is_array($tables))
		{
			$tables = array($tables);
		}

		return (count($tables) == 1) ? $tables[0] : '('.implode(', ', $tables).')';
	}

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

	/**
	 * Insert statement
	 *
	 * Generates a platform-specific insert string from the supplied data
	 *
	 * @access	public
	 * @param	string	the table name
	 * @param	array	the insert keys
	 * @param	array	the insert values
	 * @return	string
	 */
	function _insert($table, $keys, $values)
	{
		return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
	}
	
	// --------------------------------------------------------------------

	/**
	 * Insert_batch statement
	 *
	 * Generates a platform-specific insert string from the supplied data
	 *
	 * @access  public
	 * @param   string  the table name
	 * @param   array   the insert keys
	 * @param   array   the insert values
	 * @return  string
	 */
	function _insert_batch($table, $keys, $values)
	{
		return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES ".implode(', ', $values);
	}

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

	/**
	 * Update statement
	 *
	 * Generates a platform-specific update string from the supplied data
	 *
	 * @access	public
	 * @param	string	the table name
	 * @param	array	the update data
	 * @param	array	the where clause
	 * @param	array	the orderby clause
	 * @param	array	the limit clause
	 * @return	string
	 */
	function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
	{
		foreach ($values as $key => $val)
		{
			$valstr[] = $key." = ".$val;
		}

		$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

		$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';

		$sql = "UPDATE ".$table." SET ".implode(', ', $valstr);

		$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';

		$sql .= $orderby.$limit;

		return $sql;
	}
	
	// --------------------------------------------------------------------

	/**
	 * Update_Batch statement
	 *
	 * Generates a platform-specific batch update string from the supplied data
	 *
	 * @access	public
	 * @param	string	the table name
	 * @param	array	the update data
	 * @param	array	the where clause
	 * @return	string
	 */
	function _update_batch($table, $values, $index, $where = NULL)
	{
		$ids = array();
		$where = ($where != '' AND count($where) >=1) ? implode(" ", $where).' AND ' : '';

		foreach ($values as $key => $val)
		{
			$ids[] = $val[$index];

			foreach (array_keys($val) as $field)
			{
				if ($field != $index)
				{
					$final[$field][] =  'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
				}
			}
		}

		$sql = "UPDATE ".$table." SET ";
		$cases = '';

		foreach ($final as $k => $v)
		{
			$cases .= $k.' = CASE '."\n";
			foreach ($v as $row)
			{
				$cases .= $row."\n";
			}

			$cases .= 'ELSE '.$k.' END, ';
		}

		$sql .= substr($cases, 0, -2);

		$sql .= ' WHERE '.$where.$index.' IN ('.implode(',', $ids).')';

		return $sql;
	}


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

	/**
	 * Truncate statement
	 *
	 * Generates a platform-specific truncate string from the supplied data
	 * If the database does not support the truncate() command
	 * This function maps to "DELETE FROM table"
	 *
	 * @access	public
	 * @param	string	the table name
	 * @return	string
	 */
	function _truncate($table)
	{
		return $this->_delete($table);
	}

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

	/**
	 * Delete statement
	 *
	 * Generates a platform-specific delete string from the supplied data
	 *
	 * @access	public
	 * @param	string	the table name
	 * @param	array	the where clause
	 * @param	string	the limit clause
	 * @return	string
	 */
	function _delete($table, $where = array(), $like = array(), $limit = FALSE)
	{
		$conditions = '';

		if (count($where) > 0 OR count($like) > 0)
		{
			$conditions = "\nWHERE ";
			$conditions .= implode("\n", $this->ar_where);

			if (count($where) > 0 && count($like) > 0)
			{
				$conditions .= " AND ";
			}
			$conditions .= implode("\n", $like);
		}

		$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

		return "DELETE FROM ".$table.$conditions.$limit;
	}

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

	/**
	 * Limit string
	 *
	 * Generates a platform-specific LIMIT clause
	 *
	 * @access	public
	 * @param	string	the sql query string
	 * @param	integer	the number of rows to limit the query to
	 * @param	integer	the offset value
	 * @return	string
	 */
	function _limit($sql, $limit, $offset)
	{
		if ($this->pdo_driver === "cubrid" || $this->pdo_driver === "sqlite")
		{
			if ($offset == 0)
			{
				$offset = '';
			}
			else
			{
				$offset .= ", ";
			}

			return $sql."LIMIT ".$offset.$limit;
		}
		else
		{
			$sql .= "LIMIT ".$limit;

			if ($offset > 0)
			{
				$sql .= " OFFSET ".$offset;
			}
			
			return $sql;
		}
	}

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

	/**
	 * Close DB Connection
	 *
	 * @access	public
	 * @param	resource
	 * @return	void
	 */
	function _close($conn_id)
	{
		$this->conn_id = null;
	}


}



/* End of file pdo_driver.php */
/* Location: ./system/database/drivers/pdo/pdo_driver.php */