summaryrefslogtreecommitdiffstats
path: root/system/database/DB_utility.php
blob: 12680be5fbb3dada051074d2ac6dbf5cddeefbf4 (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
<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.2.4 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 - 2012, 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 1.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Database Utility Class
 *
 * @category	Database
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
abstract class CI_DB_utility extends CI_DB_forge {

	public $db;

	// Platform specific SQL strings
	// Just setting those defaults to FALSE as they are mostly MySQL-specific
	protected $_optimize_table	= FALSE;
	protected $_repair_table	= FALSE;

	/**
	 * Constructor
	 *
	 * @return	void
	 */
	public function __construct()
	{
		// Assign the main database object to $this->db
		$CI =& get_instance();
		$this->db =& $CI->db;
		log_message('debug', 'Database Utility Class Initialized');
	}

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

	/**
	 * List databases
	 *
	 * @return	array
	 */
	public function list_databases()
	{
		// Is there a cached result?
		if (isset($this->db->data_cache['db_names']))
		{
			return $this->db->data_cache['db_names'];
		}
		elseif ($this->_list_databases === FALSE)
		{
			return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
		}

		$this->db->data_cache['db_names'] = array();

		$query = $this->db->query($this->_list_databases);
		if ($query === FALSE)
		{
			return $this->db->data_cache['db_names'];
		}

		for ($i = 0, $c = count($query); $i < $c; $i++)
		{
			$this->db->data_cache['db_names'] = current($query[$i]);
		}

		return $this->db->data_cache['db_names'];
	}

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

	/**
	 * Determine if a particular database exists
	 *
	 * @param	string
	 * @return	bool
	 */
	public function database_exists($database_name)
	{
		return in_array($database_name, $this->list_databases());
	}

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

	/**
	 * Optimize Table
	 *
	 * @param	string	the table name
	 * @return	mixed
	 */
	public function optimize_table($table_name)
	{
		if ($this->_optimize_table === FALSE)
		{
			return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
		}

		$query = $this->db->query(sprintf($this->_optimize_table, $this->db->escape_identifiers($table_name)));
		if ($query !== FALSE)
		{
			$query = $query->result_array();
			return current($res);
		}

		return FALSE;
	}

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

	/**
	 * Optimize Database
	 *
	 * @return	mixed
	 */
	public function optimize_database()
	{
		if ($this->_optimize_table === FALSE)
		{
			return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
		}

		$result = array();
		foreach ($this->db->list_tables() as $table_name)
		{
			$res = $this->db->query(sprintf($this->_optimize_table, $this->db->escape_identifiers($table_name)));
			if (is_bool($res))
			{
				return $res;
			}

			// Build the result array...
			$res = $res->result_array();
			$res = current($res);
			$key = str_replace($this->db->database.'.', '', current($res));
			$keys = array_keys($res);
			unset($res[$keys[0]]);

			$result[$key] = $res;
		}

		return $result;
	}

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

	/**
	 * Repair Table
	 *
	 * @param	string	the table name
	 * @return	mixed
	 */
	public function repair_table($table_name)
	{
		if ($this->_repair_table === FALSE)
		{
			return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
		}

		$query = $this->db->query(sprintf($this->_repair_table, $this->db->escape_identifiers($table_name)));
		if (is_bool($query))
		{
			return $query;
		}

		$query = $query->result_array();
		return current($query);
	}

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

	/**
	 * Generate CSV from a query result object
	 *
	 * @param	object	The query result object
	 * @param	string	The delimiter - comma by default
	 * @param	string	The newline character - \n by default
	 * @param	string	The enclosure - double quote by default
	 * @return	string
	 */
	public function csv_from_result($query, $delim = ',', $newline = "\n", $enclosure = '"')
	{
		if ( ! is_object($query) OR ! method_exists($query, 'list_fields'))
		{
			show_error('You must submit a valid result object');
		}

		$out = '';
		// First generate the headings from the table column names
		foreach ($query->list_fields() as $name)
		{
			$out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $name).$enclosure.$delim;
		}

		$out = rtrim($out).$newline;

		// Next blast through the result array and build out the rows
		while ($row = $query->unbuffered_row('array'))
		{
			foreach ($row as $item)
			{
				$out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $item).$enclosure.$delim;
			}
			$out = rtrim($out).$newline;
		}

		return $out;
	}

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

	/**
	 * Generate XML data from a query result object
	 *
	 * @param	object	The query result object
	 * @param	array	Any preferences
	 * @return	string
	 */
	public function xml_from_result($query, $params = array())
	{
		if ( ! is_object($query) OR ! method_exists($query, 'list_fields'))
		{
			show_error('You must submit a valid result object');
		}

		// Set our default values
		foreach (array('root' => 'root', 'element' => 'element', 'newline' => "\n", 'tab' => "\t") as $key => $val)
		{
			if ( ! isset($params[$key]))
			{
				$params[$key] = $val;
			}
		}

		// Create variables for convenience
		extract($params);

		// Load the xml helper
		$CI =& get_instance();
		$CI->load->helper('xml');

		// Generate the result
		$xml = '<'.$root.'>'.$newline;
		while ($row = $query->unbuffered_row())
		{
			$xml .= $tab.'<'.$element.'>'.$newline;
			foreach ($row as $key => $val)
			{
				$xml .= $tab.$tab.'<'.$key.'>'.xml_convert($val).'</'.$key.'>'.$newline;
			}
			$xml .= $tab.'</'.$element.'>'.$newline;
		}

		return $xml.'</'.$root.'>'.$newline;
	}

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

	/**
	 * Database Backup
	 *
	 * @param	array	$params = array()
	 * @return	void
	 */
	public function backup($params = array())
	{
		// If the parameters have not been submitted as an
		// array then we know that it is simply the table
		// name, which is a valid short cut.
		if (is_string($params))
		{
			$params = array('tables' => $params);
		}

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

		// Set up our default preferences
		$prefs = array(
				'tables'		=> array(),
				'ignore'		=> array(),
				'filename'		=> '',
				'format'		=> 'gzip', // gzip, zip, txt
				'add_drop'		=> TRUE,
				'add_insert'		=> TRUE,
				'newline'		=> "\n"
			);

		// Did the user submit any preferences? If so set them....
		if (count($params) > 0)
		{
			foreach ($prefs as $key => $val)
			{
				if (isset($params[$key]))
				{
					$prefs[$key] = $params[$key];
				}
			}
		}

		// Are we backing up a complete database or individual tables?
		// If no table names were submitted we'll fetch the entire table list
		if (count($prefs['tables']) === 0)
		{
			$prefs['tables'] = $this->db->list_tables();
		}

		// Validate the format
		if ( ! in_array($prefs['format'], array('gzip', 'zip', 'txt'), TRUE))
		{
			$prefs['format'] = 'txt';
		}

		// Is the encoder supported? If not, we'll either issue an
		// error or use plain text depending on the debug settings
		if (($prefs['format'] === 'gzip' && ! @function_exists('gzencode'))
			OR ($prefs['format'] === 'zip' && ! @function_exists('gzcompress')))
		{
			if ($this->db->db_debug)
			{
				return $this->db->display_error('db_unsuported_compression');
			}

			$prefs['format'] = 'txt';
		}

		// Was a Zip file requested?
		if ($prefs['format'] === 'zip')
		{
			// Set the filename if not provided (only needed with Zip files)
			if ($prefs['filename'] === '')
			{
				$prefs['filename'] = (count($prefs['tables']) === 1 ? $prefs['tables'] : $this->db->database)
							.date('Y-m-d_H-i', time()).'.sql';
			}
			else
			{
				// If they included the .zip file extension we'll remove it
				if (preg_match('|.+?\.zip$|', $prefs['filename']))
				{
					$prefs['filename'] = str_replace('.zip', '', $prefs['filename']);
				}

				// Tack on the ".sql" file extension if needed
				if ( ! preg_match('|.+?\.sql$|', $prefs['filename']))
				{
					$prefs['filename'] .= '.sql';
				}
			}

			// Load the Zip class and output it
			$CI =& get_instance();
			$CI->load->library('zip');
			$CI->zip->add_data($prefs['filename'], $this->_backup($prefs));
			return $CI->zip->get_zip();
		}
		elseif ($prefs['format'] === 'txt') // Was a text file requested?
		{
			return $this->_backup($prefs);
		}
		elseif ($prefs['format'] === 'gzip') // Was a Gzip file requested?
		{
			return gzencode($this->_backup($prefs));
		}

		return;
	}

}

/* End of file DB_utility.php */
/* Location: ./system/database/DB_utility.php */