summaryrefslogtreecommitdiffstats
path: root/system/database/DB_driver.php
blob: 94db84bbf0dd62dc831ef355243e7441d3b850d8 (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
<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
 * Code Igniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		Rick Ellis
 * @copyright	Copyright (c) 2006, pMachine, Inc.
 * @license		http://www.codeignitor.com/user_guide/license.html 
 * @link		http://www.codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
 
// ------------------------------------------------------------------------

/**
 * Database Driver Class
 * 
 * This is the platform-independent base DB implementation class.
 * This class will not be called directly. Rather, the adapter
 * class for the specific database will extend and instantiate it.
 *
 * @package		CodeIgniter
 * @subpackage	Drivers
 * @category	Database
 * @author		Rick Ellis
 * @link		http://www.codeigniter.com/user_guide/database/
 */
class CI_DB_driver {

	var $username;
	var $password;
	var $hostname;
	var $database;
	var $dbdriver		= 'mysql';
	var $dbprefix		= '';
	var $port			= '';
	var $pconnect		= FALSE;
	var $conn_id		= FALSE;
	var $result_id		= FALSE;
	var $db_debug		= FALSE;
	var $benchmark		= 0;
	var $query_count	= 0;
	var $bind_marker	= '?';
	var $queries		= array();
	var $trans_enabled	= TRUE;
	var $_trans_depth	= 0;
	var $_trans_failure	= FALSE; // Used with transactions to determine if a rollback should occur

    // These are use with Oracle
    var $stmt_id;
    var $curs_id;
    var $limit_used;

	
	/**
	 * Constructor.  Accepts one parameter containing the database
	 * connection settings. 
	 *
	 * Database settings can be passed as discreet 
	 * parameters or as a data source name in the first 
	 * parameter. DSNs must have this prototype:
	 * $dsn = 'driver://username:password@hostname/database';
	 *
	 * @param mixed. Can be an array or a DSN string
	 */	
	function CI_DB_driver($params)
	{
		$this->initialize($params);
		log_message('debug', 'Database Driver Class Initialized');
	}
	
	// --------------------------------------------------------------------

	/**
	 * Initialize Database Settings
	 *
	 * @access	private Called by the constructor
	 * @param	mixed
	 * @return	void
	 */	
	function initialize($params = '')
	{	
		if (is_array($params))
		{
			foreach (array('hostname' => '', 'username' => '', 'password' => '', 'database' => '', 'dbdriver' => 'mysql', 'dbprefix' => '', 'port' => '', 'pconnect' => FALSE, 'db_debug' => FALSE) as $key => $val)
			{
				$this->$key = ( ! isset($params[$key])) ? $val : $params[$key];
			}
		}
		elseif (strpos($params, '://'))
		{
			if (FALSE === ($dsn = @parse_url($params)))
			{
				log_message('error', 'Invalid DB Connection String');
			
				if ($this->db_debug)
				{
					return $this->display_error('db_invalid_connection_str');
				}
				return FALSE;			
			}
			
			$this->hostname = ( ! isset($dsn['host'])) ? '' : rawurldecode($dsn['host']);
			$this->username = ( ! isset($dsn['user'])) ? '' : rawurldecode($dsn['user']);
			$this->password = ( ! isset($dsn['pass'])) ? '' : rawurldecode($dsn['pass']);
			$this->database = ( ! isset($dsn['path'])) ? '' : rawurldecode(substr($dsn['path'], 1));
		}
	
		if ($this->pconnect == FALSE)
		{
			$this->conn_id = $this->db_connect();
		}
		else
		{
			$this->conn_id = $this->db_pconnect();
		}	
       
        if ( ! $this->conn_id)
        { 
			log_message('error', 'Unable to connect to the database');
			
            if ($this->db_debug)
            {
				$this->display_error('db_unable_to_connect');
            }
        }
		else
		{
			if ( ! $this->db_select())
			{
				log_message('error', 'Unable to select database: '.$this->database);
			
				if ($this->db_debug)
				{
					$this->display_error('db_unable_to_select', $this->database);
				}
			}	
		}	
	}
	
	
	// --------------------------------------------------------------------

	/**
	 * The name of the platform in use (mysql, mssql, etc...)
	 *
	 * @access	public
	 * @return	string		 
	 */	
	function platform()
	{
		return $this->dbdriver;
	}

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

	/**
	 * Database Version Number.  Returns a string containing the 
	 * version of the database being used
	 *
	 * @access	public
	 * @return	string	
	 */	
	function version()
	{
		if (FALSE === ($sql = $this->_version()))
		{
            if ($this->db_debug)
            {
				return $this->display_error('db_unsupported_function');
            }
            return FALSE;        
		}
		
        if ($this->dbdriver == 'oci8')
        {
			return $sql;
		}
	
		$query = $this->query($sql);
		$row = $query->row();
		return $row->ver;
	}
	
	// --------------------------------------------------------------------

	/**
	 * Execute the query
	 *
	 * Accepts an SQL string as input and returns a result object upon 
	 * successful execution of a "read" type query.  Returns boolean TRUE 
	 * upon successful execution of a "write" type query. Returns boolean 
	 * FALSE upon failure, and if the $db_debug variable is set to TRUE 
	 * will raise an error.
	 * 
	 * @access	public
	 * @param	string	An SQL query string
	 * @param	array	An array of binding data
	 * @return	mixed		 
	 */	
    function query($sql, $binds = FALSE, $return_object = TRUE)
    {    
		if ($sql == '')
		{
            if ($this->db_debug)
            {
				log_message('error', 'Invalid query: '.$sql);
				return $this->display_error('db_invalid_query');
            }
            return FALSE;        
		}
		
		// Compile binds if needed
		if ($binds !== FALSE)
		{
			$sql = $this->compile_binds($sql, $binds);
		}

        // Save the  query for debugging
        $this->queries[] = $sql;

		// Start the Query Timer
        $time_start = list($sm, $ss) = explode(' ', microtime());
      
		// Run the Query
        if (FALSE === ($this->result_id = $this->simple_query($sql)))
        { 
        	// This will trigger a rollback if transactions are being used
        	$this->_trans_failure = TRUE;
        	
            if ($this->db_debug)
            {
				log_message('error', 'Query error: '.$this->_error_message());
				return $this->display_error(
										array(
												'Error Number: '.$this->_error_number(), 
												$this->_error_message(),
												$sql
											)
										);
            }
          
          return FALSE;
        }
        
		// Stop and aggregate the query time results
		$time_end = list($em, $es) = explode(' ', microtime());
		$this->benchmark += ($em + $es) - ($sm + $ss);

		// Increment the query counter
        $this->query_count++;
        
		// Was the query a "write" type?
		// If so we'll simply return true
		if ($this->is_write_type($sql) === TRUE)
		{
			return TRUE;
		}
		
		// Return TRUE if we don't need to create a result object 
		// Currently only the Oracle driver uses this when stored
		// procedures are used
		if ($return_object !== TRUE)
		{
			return TRUE;
		}
		
		// Define the result driver name
		$result = 'CI_DB_'.$this->dbdriver.'_result';
		
		// Load the result classes
		if ( ! class_exists($result))
		{
			include_once(BASEPATH.'database/DB_result'.EXT);
			include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT);		
		}

		// Instantiate the result object	
        $RES = new $result();
        $RES->conn_id	= $this->conn_id;
        $RES->db_debug	= $this->db_debug;
        $RES->result_id	= $this->result_id;
        
        if ($this->dbdriver == 'oci8')
        {
			$RES->stmt_id   = $this->stmt_id;
			$RES->curs_id   = NULL;
			$RES->limit_used = $this->limit_used;
        }

		return $RES;
	}
	
	// --------------------------------------------------------------------

	/**
	 * Simple Query  
	 * This is a simiplified version of the query() function.  Internally
	 * we only use it when running transaction commands since they do
	 * not require all the features of the main query() function.
	 * 
	 * @access	public
	 * @param	string	the sql query
	 * @return	mixed		 
	 */	
	function simple_query($sql)
	{
		if ( ! $this->conn_id)
		{
			$this->initialize();
		}

		return $this->_execute($sql, $this->conn_id);
	}
	
	// --------------------------------------------------------------------

	/**
	 * Disable Transactions
	 * This permits transactions to be disabled at run-time.
	 * 
	 * @access	public
	 * @return	void		 
	 */	
	function trans_off()
	{
		$this->trans_enabled = FALSE;
	}

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

	/**
	 * Start Transaction
	 * 
	 * @access	public
	 * @return	void		 
	 */	
	function trans_start($test_mode = FALSE)
	{	
		if ( ! $this->trans_enabled)
		{
			return FALSE;
		}

		// When transactions are nested we only begin/commit/rollback the outermost ones
		if ($this->_trans_depth > 0)
		{
			$this->_trans_depth += 1;
			return;
		}
		
		$this->trans_begin($test_mode);
	}

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

	/**
	 * Complete Transaction
	 * 
	 * @access	public
	 * @return	bool		 
	 */	
	function trans_complete()
	{
		if ( ! $this->trans_enabled)
		{
			return FALSE;
		}
	
		// When transactions are nested we only begin/commit/rollback the outermost ones
		if ($this->_trans_depth > 1)
		{
			$this->_trans_depth -= 1;
			return TRUE;
		}
	
		// The query() function will set this flag to TRUE in the event that a query failed
		if ($this->_trans_failure === TRUE)
		{
			$this->trans_rollback();
			
			if ($this->db_debug)
			{
				return $this->display_error('db_transaction_failure');
			}
			return FALSE;			
		}
		
		$this->trans_commit();
		return TRUE;	
	}

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

	/**
	 * Lets you retrieve the transaction flag to determine if it has failed
	 * 
	 * @access	public
	 * @return	bool		 
	 */	
	function trans_status()
	{
		return $this->_trans_failure;
	}

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

	/**
	 * Compile Bindings
	 * 
	 * @access	public
	 * @param	string	the sql statement
	 * @param	array	an array of bind data
	 * @return	string		 
	 */	
	function compile_binds($sql, $binds)
	{	
		if (FALSE === strpos($sql, $this->bind_marker))
		{
			return $sql;
		}
		
		if ( ! is_array($binds))
		{
			$binds = array($binds);
		}
		
		foreach ($binds as $val)
		{
			$val = $this->escape($val);
					
			// Just in case the replacement string contains the bind
			// character we'll temporarily replace it with a marker
			$val = str_replace($this->bind_marker, '{%bind_marker%}', $val);
			$sql = preg_replace("#".preg_quote($this->bind_marker, '#')."#", str_replace('$', '\$', $val), $sql, 1);
		}

		return str_replace('{%bind_marker%}', $this->bind_marker, $sql);		
	}
	
	// --------------------------------------------------------------------

	/**
	 * Determines if a query is a "write" type. 
	 * 
	 * @access	public
	 * @param	string	An SQL query string
	 * @return	boolean		 
	 */	
	function is_write_type($sql)
	{
		if ( ! preg_match('/^\s*"?(INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|LOAD DATA|COPY|ALTER|GRANT|REVOKE|LOCK|UNLOCK)\s+/i', $sql)) 
		{
			return FALSE;
		}
		return TRUE;
	}
	
	// --------------------------------------------------------------------

	/**
	 * Calculate the aggregate query elapsed time 
	 * 
	 * @access	public
	 * @param	intiger	The number of decimal places
	 * @return	integer		 
	 */	
	function elapsed_time($decimals = 6)
	{
		return number_format($this->benchmark, $decimals);
	}
	
	// --------------------------------------------------------------------

	/**
	 * Returns the total number of queries
	 * 
	 * @access	public
	 * @return	integer		 
	 */	
	function total_queries()
	{
		return $this->query_count;
	}
	
	// --------------------------------------------------------------------

	/**
	 * Returns the last query that was executed
	 * 
	 * @access	public
	 * @return	void		 
	 */	
	function last_query()
	{
		return end($this->queries);
	}
	
	// --------------------------------------------------------------------

	/**
	 * "Smart" Escape String
	 *
	 * Escapes data based on type
	 * Sets boolean and null types
	 * 
	 * @access	public
	 * @param	string
	 * @return	integer		 
	 */	
	function escape($str)
	{	
		switch (gettype($str))
		{
			case 'string'	:	$str = "'".$this->escape_str($str)."'";
				break;
			case 'boolean'	:	$str = ($str === FALSE) ? 0 : 1;
				break;
			default			:	$str = ($str === NULL) ? 'NULL' : $str;
				break;
		}		

		return $str;
	}



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

	/**
	 * Primary
	 *
	 * Retrieves the primary key.  It assumes that the row in the first
	 * position is the primary key
	 * 
	 * @access	public
	 * @param	string	the table name
	 * @return	string		 
	 */	
	function primary($table = '')
	{	
		$fields = $this->field_names($table);
		
		if ( ! is_array($fields))
		{
			return FALSE;
		}

		return current($fields);
	}

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

	/**
	 * Fetch MySQL Field Names
	 *
	 * @access	public
	 * @param	string	the table name
	 * @return	array		 
	 */
    function field_names($table = '')
    {
    	if ($table == '')
    	{
			if ($this->db_debug)
			{
				return $this->display_error('db_field_param_missing');
			}
			return FALSE;			
    	}
    	
		if (FALSE === ($sql = $this->_list_columns($this->dbprefix.$table)))
		{
            if ($this->db_debug)
            {
				return $this->display_error('db_unsupported_function');
            }
            return FALSE;        
		}
    	
    	$query = $this->query($sql);
    	
    	$retval = array();
		foreach($query->result_array() as $row)
		{
			if (isset($row['COLUMN_NAME']))
			{
				$retval[] = $row['COLUMN_NAME'];
			}
			else
			{
				$retval[] = current($row);
			}    	
		}
    	
    	return $retval;
    }
	
	// --------------------------------------------------------------------

	/**
	 * Returns an object with field data
	 * 
	 * @access	public
	 * @param	string	the table name
	 * @return	object		 
	 */	
	function field_data($table = '')
	{
    	if ($table == '')
    	{
			if ($this->db_debug)
			{
				return $this->display_error('db_field_param_missing');
			}
			return FALSE;			
    	}
    	
		$query = $this->query($this->_field_data($this->dbprefix.$table));
		return $query->field_data();
	}	

	// --------------------------------------------------------------------
	
	/**
	 * Generate an insert string
	 * 
	 * @access	public
	 * @param	string	the table upon which the query will be performed
	 * @param	array	an associative array data of key/values
	 * @return	string		 
	 */	
	function insert_string($table, $data)
	{
		$fields = array();      
		$values = array();
		
		foreach($data as $key => $val) 
		{
			$fields[] = $key;
			$values[] = $this->escape($val);
		}

		return $this->_insert($this->dbprefix.$table, $fields, $values);
	}
	
	// --------------------------------------------------------------------

	/**
	 * Generate an update string
	 * 
	 * @access	public
	 * @param	string	the table upon which the query will be performed
	 * @param	array	an associative array data of key/values
	 * @param	mixed	the "where" statement
	 * @return	string		 
	 */	
	function update_string($table, $data, $where)
	{
		if ($where == '')
			return false;
					
		$fields = array();
		foreach($data as $key => $val) 
		{
			$fields[$key] = $this->escape($val);
		}

		if ( ! is_array($where))
		{
			$dest = array($where);
		}
		else
		{
			$dest = array();
			foreach ($where as $key => $val)
			{
				$prefix = (count($dest) == 0) ? '' : ' AND ';
	
				if ($val != '')
				{
					if ( ! $this->_has_operator($key))
					{
						$key .= ' =';
					}
				
					$val = ' '.$this->escape($val);
				}
							
				$dest[] = $prefix.$key.$val;
			}
		}		

		return $this->_update($this->dbprefix.$table, $fields, $dest);
	}    

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

	/**
	 * Enables a native PHP function to be run, using a platform agnostic wrapper.
	 * 
	 * @access	public
	 * @param	string	the function name
	 * @param	mixed	any parameters needed by the function
	 * @return	mixed		 
	 */	
	function call_function($function)
	{
		$driver = ($this->dbdriver == 'postgre') ? 'pg_' : $this->dbdriver.'_';
	
		if (FALSE === strpos($driver, $function))
		{
			$function = $driver.$function;
		}
		
		if ( ! function_exists($function))
		{ 
			if ($this->db_debug)
			{
				return $this->display_error('db_unsupported_function');
			}
			return FALSE;			
		}
		else
		{
			$args = (func_num_args() > 1) ? array_splice(func_get_args(), 1) : null;

			return call_user_func_array($function, $args); 
		}
	}
	
	// --------------------------------------------------------------------

	/**
	 * Close DB Connection
	 * 
	 * @access	public
	 * @return	void		 
	 */	
    function close()
    {
        if (is_resource($this->conn_id))
        {
            $this->_close($this->conn_id);
		}   
		$this->conn_id = FALSE;
    }
	
	// --------------------------------------------------------------------

	/**
	 * Display an error message
	 * 
	 * @access	public
	 * @param	string	the error message
	 * @param	string	any "swap" values
	 * @param	boolean	whether to localize the message
	 * @return	string	sends the application/errror_db.php template		 
	 */	
    function display_error($error = '', $swap = '', $native = FALSE) 
    {
		$LANG = new CI_Language();
		$LANG->load('db');

		$heading = 'MySQL Error';
		
		if ($native == TRUE)
		{
			$message = $error;
		}
		else
		{
			$message = ( ! is_array($error)) ? array(str_replace('%s', $swap, $LANG->line($error))) : $error;
		}

		if ( ! class_exists('CI_Exceptions'))
		{
			include_once(BASEPATH.'libraries/Exceptions'.EXT);
		}
		
		$error = new CI_Exceptions();
		echo $error->show_error('An Error Was Encountered', $message, 'error_db');
		exit;

    }  
	
}

?>