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/halogy/database/drivers/sqlite/sqlite_driver.php

https://bitbucket.org/haloweb/halogy-1.0/
PHP | 657 lines | 250 code | 105 blank | 302 comment | 30 complexity | 1a5ec4dd7662ff9ad4ed28696d36caa3 MD5 | raw file
  1<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
  2/**
  3 * CodeIgniter
  4 *
  5 * An open source application development framework for PHP 4.3.2 or newer
  6 *
  7 * @package		CodeIgniter
  8 * @author		ExpressionEngine Dev Team
  9 * @copyright	Copyright (c) 2008 - 2009, EllisLab, Inc.
 10 * @license		http://codeigniter.com/user_guide/license.html
 11 * @link		http://codeigniter.com
 12 * @since		Version 1.0
 13 * @filesource
 14 */
 15
 16// ------------------------------------------------------------------------
 17
 18
 19
 20/**
 21 * SQLite Database Adapter Class
 22 *
 23 * Note: _DB is an extender class that the app controller
 24 * creates dynamically based on whether the active record
 25 * class is being used or not.
 26 *
 27 * @package		CodeIgniter
 28 * @subpackage	Drivers
 29 * @category	Database
 30 * @author		ExpressionEngine Dev Team
 31 * @link		http://codeigniter.com/user_guide/database/
 32 */
 33class CI_DB_sqlite_driver extends CI_DB {
 34
 35	var $dbdriver = 'sqlite';
 36	
 37	// The character used to escape with - not needed for SQLite
 38	var $_escape_char = '';
 39
 40	// clause and character used for LIKE escape sequences
 41 	var $_like_escape_str = " ESCAPE '%s' ";
 42	var $_like_escape_chr = '!';
 43	
 44	/**
 45	 * The syntax to count rows is slightly different across different
 46	 * database engines, so this string appears in each driver and is
 47	 * used for the count_all() and count_all_results() functions.
 48	 */
 49	var $_count_string = "SELECT COUNT(*) AS ";
 50	var $_random_keyword = ' Random()'; // database specific random keyword
 51
 52	/**
 53	 * Non-persistent database connection
 54	 *
 55	 * @access	private called by the base class
 56	 * @return	resource
 57	 */	
 58	function db_connect()
 59	{
 60		if ( ! $conn_id = @sqlite_open($this->database, FILE_WRITE_MODE, $error))
 61		{
 62			log_message('error', $error);
 63			
 64			if ($this->db_debug)
 65			{
 66				$this->display_error($error, '', TRUE);
 67			}
 68			
 69			return FALSE;
 70		}
 71		
 72		return $conn_id;
 73	}
 74	
 75	// --------------------------------------------------------------------
 76
 77	/**
 78	 * Persistent database connection
 79	 *
 80	 * @access	private called by the base class
 81	 * @return	resource
 82	 */	
 83	function db_pconnect()
 84	{
 85		if ( ! $conn_id = @sqlite_popen($this->database, FILE_WRITE_MODE, $error))
 86		{
 87			log_message('error', $error);
 88			
 89			if ($this->db_debug)
 90			{
 91				$this->display_error($error, '', TRUE);
 92			}
 93			
 94			return FALSE;
 95		}
 96		
 97		return $conn_id;
 98	}
 99	
100	// --------------------------------------------------------------------
101
102	/**
103	 * Reconnect
104	 *
105	 * Keep / reestablish the db connection if no queries have been
106	 * sent for a length of time exceeding the server's idle timeout
107	 *
108	 * @access	public
109	 * @return	void
110	 */
111	function reconnect()
112	{
113		// not implemented in SQLite
114	}
115
116	// --------------------------------------------------------------------
117
118	/**
119	 * Select the database
120	 *
121	 * @access	private called by the base class
122	 * @return	resource
123	 */	
124	function db_select()
125	{
126		return TRUE;
127	}
128
129	// --------------------------------------------------------------------
130
131	/**
132	 * Set client character set
133	 *
134	 * @access	public
135	 * @param	string
136	 * @param	string
137	 * @return	resource
138	 */
139	function db_set_charset($charset, $collation)
140	{
141		// @todo - add support if needed
142		return TRUE;
143	}
144
145	// --------------------------------------------------------------------
146	
147	/**
148	 * Version number query string
149	 *
150	 * @access	public
151	 * @return	string
152	 */
153	function _version()
154	{
155		return sqlite_libversion();
156	}
157	
158	// --------------------------------------------------------------------
159
160	/**
161	 * Execute the query
162	 *
163	 * @access	private called by the base class
164	 * @param	string	an SQL query
165	 * @return	resource
166	 */	
167	function _execute($sql)
168	{
169		$sql = $this->_prep_query($sql);
170		return @sqlite_query($this->conn_id, $sql);
171	}
172	
173	// --------------------------------------------------------------------
174
175	/**
176	 * Prep the query
177	 *
178	 * If needed, each database adapter can prep the query string
179	 *
180	 * @access	private called by execute()
181	 * @param	string	an SQL query
182	 * @return	string
183	 */	
184	function _prep_query($sql)
185	{
186		return $sql;
187	}
188
189	// --------------------------------------------------------------------
190
191	/**
192	 * Begin Transaction
193	 *
194	 * @access	public
195	 * @return	bool		
196	 */	
197	function trans_begin($test_mode = FALSE)
198	{
199		if ( ! $this->trans_enabled)
200		{
201			return TRUE;
202		}
203		
204		// When transactions are nested we only begin/commit/rollback the outermost ones
205		if ($this->_trans_depth > 0)
206		{
207			return TRUE;
208		}
209
210		// Reset the transaction failure flag.
211		// If the $test_mode flag is set to TRUE transactions will be rolled back
212		// even if the queries produce a successful result.
213		$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;
214
215		$this->simple_query('BEGIN TRANSACTION');
216		return TRUE;
217	}
218
219	// --------------------------------------------------------------------
220
221	/**
222	 * Commit Transaction
223	 *
224	 * @access	public
225	 * @return	bool		
226	 */	
227	function trans_commit()
228	{
229		if ( ! $this->trans_enabled)
230		{
231			return TRUE;
232		}
233
234		// When transactions are nested we only begin/commit/rollback the outermost ones
235		if ($this->_trans_depth > 0)
236		{
237			return TRUE;
238		}
239
240		$this->simple_query('COMMIT');
241		return TRUE;
242	}
243
244	// --------------------------------------------------------------------
245
246	/**
247	 * Rollback Transaction
248	 *
249	 * @access	public
250	 * @return	bool		
251	 */	
252	function trans_rollback()
253	{
254		if ( ! $this->trans_enabled)
255		{
256			return TRUE;
257		}
258
259		// When transactions are nested we only begin/commit/rollback the outermost ones
260		if ($this->_trans_depth > 0)
261		{
262			return TRUE;
263		}
264
265		$this->simple_query('ROLLBACK');
266		return TRUE;
267	}
268	
269	// --------------------------------------------------------------------
270
271	/**
272	 * Escape String
273	 *
274	 * @access	public
275	 * @param	string
276	 * @param	bool	whether or not the string will be used in a LIKE condition
277	 * @return	string
278	 */
279	function escape_str($str, $like = FALSE)
280	{
281		if (is_array($str))
282		{
283			foreach($str as $key => $val)
284	   		{
285				$str[$key] = $this->escape_str($val, $like);
286	   		}
287   		
288	   		return $str;
289	   	}
290	
291		$str = sqlite_escape_string($str);
292		
293		// escape LIKE condition wildcards
294		if ($like === TRUE)
295		{
296			$str = str_replace(	array('%', '_', $this->_like_escape_chr),
297								array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
298								$str);
299		}
300		
301		return $str;
302	}
303		
304	// --------------------------------------------------------------------
305
306	/**
307	 * Affected Rows
308	 *
309	 * @access	public
310	 * @return	integer
311	 */
312	function affected_rows()
313	{
314		return sqlite_changes($this->conn_id);
315	}
316	
317	// --------------------------------------------------------------------
318
319	/**
320	 * Insert ID
321	 *
322	 * @access	public
323	 * @return	integer
324	 */
325	function insert_id()
326	{
327		return @sqlite_last_insert_rowid($this->conn_id);
328	}
329
330	// --------------------------------------------------------------------
331
332	/**
333	 * "Count All" query
334	 *
335	 * Generates a platform-specific query string that counts all records in
336	 * the specified database
337	 *
338	 * @access	public
339	 * @param	string
340	 * @return	string
341	 */
342	function count_all($table = '')
343	{
344		if ($table == '')
345		{
346			return 0;
347		}
348
349		$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows') . " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));
350		
351		if ($query->num_rows() == 0)
352		{
353			return 0;
354		}
355
356		$row = $query->row();
357		return (int) $row->numrows;
358	}
359
360	// --------------------------------------------------------------------
361
362	/**
363	 * List table query
364	 *
365	 * Generates a platform-specific query string so that the table names can be fetched
366	 *
367	 * @access	private
368	 * @param	boolean
369	 * @return	string
370	 */
371	function _list_tables($prefix_limit = FALSE)
372	{
373		$sql = "SELECT name from sqlite_master WHERE type='table'";
374
375		if ($prefix_limit !== FALSE AND $this->dbprefix != '')
376		{
377			$sql .= " AND 'name' LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_char);
378		}
379		return $sql;
380	}
381
382	// --------------------------------------------------------------------
383
384	/**
385	 * Show column query
386	 *
387	 * Generates a platform-specific query string so that the column names can be fetched
388	 *
389	 * @access	public
390	 * @param	string	the table name
391	 * @return	string
392	 */
393	function _list_columns($table = '')
394	{
395		// Not supported
396		return FALSE;
397	}
398
399	// --------------------------------------------------------------------
400
401	/**
402	 * Field data query
403	 *
404	 * Generates a platform-specific query so that the column data can be retrieved
405	 *
406	 * @access	public
407	 * @param	string	the table name
408	 * @return	object
409	 */
410	function _field_data($table)
411	{
412		return "SELECT * FROM ".$table." LIMIT 1";
413	}
414
415	// --------------------------------------------------------------------
416
417	/**
418	 * The error message string
419	 *
420	 * @access	private
421	 * @return	string
422	 */
423	function _error_message()
424	{
425		return sqlite_error_string(sqlite_last_error($this->conn_id));
426	}
427	
428	// --------------------------------------------------------------------
429
430	/**
431	 * The error message number
432	 *
433	 * @access	private
434	 * @return	integer
435	 */
436	function _error_number()
437	{
438		return sqlite_last_error($this->conn_id);
439	}
440
441	// --------------------------------------------------------------------
442
443	/**
444	 * Escape the SQL Identifiers
445	 *
446	 * This function escapes column and table names
447	 *
448	 * @access	private
449	 * @param	string
450	 * @return	string
451	 */
452	function _escape_identifiers($item)
453	{
454		if ($this->_escape_char == '')
455		{
456			return $item;
457		}
458
459		foreach ($this->_reserved_identifiers as $id)
460		{
461			if (strpos($item, '.'.$id) !== FALSE)
462			{
463				$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);  
464				
465				// remove duplicates if the user already included the escape
466				return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
467			}		
468		}
469	
470		if (strpos($item, '.') !== FALSE)
471		{
472			$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;			
473		}
474		else
475		{
476			$str = $this->_escape_char.$item.$this->_escape_char;
477		}
478		
479		// remove duplicates if the user already included the escape
480		return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
481	}
482			
483	// --------------------------------------------------------------------
484
485	/**
486	 * From Tables
487	 *
488	 * This function implicitly groups FROM tables so there is no confusion
489	 * about operator precedence in harmony with SQL standards
490	 *
491	 * @access	public
492	 * @param	type
493	 * @return	type
494	 */
495	function _from_tables($tables)
496	{
497		if ( ! is_array($tables))
498		{
499			$tables = array($tables);
500		}
501		
502		return '('.implode(', ', $tables).')';
503	}
504
505	// --------------------------------------------------------------------
506	
507	/**
508	 * Insert statement
509	 *
510	 * Generates a platform-specific insert string from the supplied data
511	 *
512	 * @access	public
513	 * @param	string	the table name
514	 * @param	array	the insert keys
515	 * @param	array	the insert values
516	 * @return	string
517	 */
518	function _insert($table, $keys, $values)
519	{	
520		return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
521	}
522	
523	// --------------------------------------------------------------------
524
525	/**
526	 * Update statement
527	 *
528	 * Generates a platform-specific update string from the supplied data
529	 *
530	 * @access	public
531	 * @param	string	the table name
532	 * @param	array	the update data
533	 * @param	array	the where clause
534	 * @param	array	the orderby clause
535	 * @param	array	the limit clause
536	 * @return	string
537	 */
538	function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
539	{
540		foreach($values as $key => $val)
541		{
542			$valstr[] = $key." = ".$val;
543		}
544		
545		$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
546		
547		$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';
548	
549		$sql = "UPDATE ".$table." SET ".implode(', ', $valstr);
550
551		$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';
552
553		$sql .= $orderby.$limit;
554		
555		return $sql;
556	}
557
558	
559	// --------------------------------------------------------------------
560
561	/**
562	 * Truncate statement
563	 *
564	 * Generates a platform-specific truncate string from the supplied data
565	 * If the database does not support the truncate() command
566	 * This function maps to "DELETE FROM table"
567	 *
568	 * @access	public
569	 * @param	string	the table name
570	 * @return	string
571	 */	
572	function _truncate($table)
573	{
574		return $this->_delete($table);
575	}
576	
577	// --------------------------------------------------------------------
578
579	/**
580	 * Delete statement
581	 *
582	 * Generates a platform-specific delete string from the supplied data
583	 *
584	 * @access	public
585	 * @param	string	the table name
586	 * @param	array	the where clause
587	 * @param	string	the limit clause
588	 * @return	string
589	 */	
590	function _delete($table, $where = array(), $like = array(), $limit = FALSE)
591	{
592		$conditions = '';
593
594		if (count($where) > 0 OR count($like) > 0)
595		{
596			$conditions = "\nWHERE ";
597			$conditions .= implode("\n", $this->ar_where);
598
599			if (count($where) > 0 && count($like) > 0)
600			{
601				$conditions .= " AND ";
602			}
603			$conditions .= implode("\n", $like);
604		}
605
606		$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
607	
608		return "DELETE FROM ".$table.$conditions.$limit;
609	}
610	
611	// --------------------------------------------------------------------
612
613	/**
614	 * Limit string
615	 *
616	 * Generates a platform-specific LIMIT clause
617	 *
618	 * @access	public
619	 * @param	string	the sql query string
620	 * @param	integer	the number of rows to limit the query to
621	 * @param	integer	the offset value
622	 * @return	string
623	 */
624	function _limit($sql, $limit, $offset)
625	{	
626		if ($offset == 0)
627		{
628			$offset = '';
629		}
630		else
631		{
632			$offset .= ", ";
633		}
634		
635		return $sql."LIMIT ".$offset.$limit;
636	}
637
638	// --------------------------------------------------------------------
639
640	/**
641	 * Close DB Connection
642	 *
643	 * @access	public
644	 * @param	resource
645	 * @return	void
646	 */
647	function _close($conn_id)
648	{
649		@sqlite_close($conn_id);
650	}
651
652
653}
654
655
656/* End of file sqlite_driver.php */
657/* Location: ./system/database/drivers/sqlite/sqlite_driver.php */