summaryrefslogtreecommitdiff
path: root/framework/Data/ActiveRecord/TActiveRecord.php
blob: bdb0359629a86f531494dbe4e6eaf07454885f8b (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
<?php
/**
 * TActiveRecord class file.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2007 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id$
 * @package System.Data.ActiveRecord
 */

Prado::using('System.Data.ActiveRecord.TActiveRecordManager');
Prado::using('System.Data.ActiveRecord.TActiveRecordCriteria');

/**
 * Base class for active records.
 *
 * An active record creates an object that wraps a row in a database table
 * or view, encapsulates the database access, and adds domain logic on that data.
 *
 * The essence of an Active Record is an object model of the
 * domain (e.g. products, items) that incorporates both behavior and
 * data in which the classes match very closely the record structure of an
 * underlying database. Each Active Record is responsible for saving and
 * loading to the database and also for any domain logic that acts on the data.
 *
 * The Active Record provides methods that do the following:
 *  1. Construct an instance of the Active Record from a SQL result set row.
 *  2. Construct a new instance for later insertion into the table.
 *  3. Finder methods to wrap commonly used SQL queries and return Active Record objects.
 *  4. Update the database and insert into it the data in the Active Record.
 *
 * Example:
 * <code>
 * class UserRecord extends TActiveRecord
 * {
 *     public $username; //corresponds to the fieldname in the table
 *     public $email;
 *
 *     public static final $_tablename='users'; //optional table name.
 *
 *     //returns active record finder instance
 *     public static function finder()
 *     {
 *         return self::getRecordFinder('UserRecord');
 *     }
 * }
 *
 * //create a connection and give it to the ActiveRecord manager.
 * $dsn = 'pgsql:host=localhost;dbname=test';
 * $conn = new TDbConnection($dsn, 'dbuser','dbpass');
 * TActiveRecordManager::getInstance()->setDbConnection($conn);
 *
 * //load the user record with username (primary key) 'admin'.
 * $user = UserRecord::finder()->findByPk('admin');
 * $user->email = 'admin@example.org';
 * $user->save(); //update the 'admin' record.
 * </code>
 *
 * @author Wei Zhuo <weizho[at]gmail[dot]com>
 * @version $Id$
 * @package System.Data.ActiveRecord
 * @since 3.1
 */
abstract class TActiveRecord extends TComponent
{
	/**
	 * @var boolean true if this class is read only.
	 */
	private $_readOnly=false;

	/**
	 * @var TDbConnection database connection object.
	 */
	private $_connection;

	/**
	 * Prevent __call() method creating __sleep() when serializing.
	 */
	public function __sleep()
	{
		return array_keys(get_object_vars($this));
	}

	/**
	 * Prevent __call() method creating __wake() when unserializing.
	 */
	public function __wake(){}

	/**
	 * Create a new instance of an active record with given $data. The record
	 * can be saved to the database specified by the $connection object.
	 *
	 * @param array optional name value pair record data.
	 * @param TDbConnection optional database connection this object record use.
	 */
	public function __construct($data=array(), $connection=null)
	{
		$this->copyFrom($data);
		if($connection!==null)
			$this->_connection=$connection;
	}

	/**
	 * Copies data from an array or another object.
	 * @throws TActiveRecordException if data is not array or not object.
	 * @return TActiveRecord current instance.
	 */
	public function copyFrom($data)
	{
		$data = is_object($data) ? get_object_vars($data) : $data;
		if(!is_array($data))
			throw new TActiveRecordException('ar_must_copy_from_array_or_object', get_class($this));
		foreach($data as $name=>$value)
				$this->$name = $value;
		return $this;
	}

	/**
	 * Gets the current Db connection, the connection object is obtained from
	 * the TActiveRecordManager if connection is currently null.
	 * @return TDbConnection current db connection for this object.
	 */
	public function getDbConnection()
	{
		if($this->_connection===null)
			$this->_connection=self::getRecordManager()->getDbConnection();
		if($this->_connection===null) //check it
			throw new TActiveRecordException('ar_invalid_db_connection',get_class($this));
		return $this->_connection;
	}

	/**
	 * @param TDbConnection db connection object for this record.
	 */
	public function setDbConnection($connection)
	{
		$this->_connection=$connection;
	}

	/**
	 * Returns the instance of a active record finder for a particular class.
	 * @param string active record class name.
	 * @return TActiveRecord active record finder instance.
	 */
	public static function getRecordFinder($class)
	{
		static $finders = array();
		if(!isset($finders[$class]))
		{
			$f = Prado::createComponent($class);
			$f->_readOnly=true;
			$finders[$class]=$f;
		}
		return $finders[$class];
	}

	/**
	 * Gets the record manager for this object, the default is to call
	 * TActiveRecordManager::getInstance().
	 * @return TActiveRecordManager default active record manager.
	 */
	public function getRecordManager()
	{
		return TActiveRecordManager::getInstance();
	}

	/**
	 * Saves the current record to the database, insert or update is automatically determined.
	 * @return boolean true if record was saved successfully, false otherwise.
	 */
	public function save()
	{
		$registry = $this->getRecordManager()->getObjectStateRegistry();
		$gateway = $this->getRecordManager()->getRecordGateway();
		if(!$this->_readOnly)
			$this->_readOnly = $gateway->getMetaData($this)->getIsView();
		if($this->_readOnly)
			throw new TActiveRecordException('ar_readonly_exception',get_class($this));
		return $registry->commit($this,$gateway);
	}

	/**
	 * Deletes the current record from the database. Once deleted, this object
	 * can not be saved again in the same instance.
	 * @return boolean true if the record was deleted successfully, false otherwise.
	 */
	public function delete()
	{
		$registry = $this->getRecordManager()->getObjectStateRegistry();
		$registry->registerRemoved($this);
		return $this->save();
	}

	/**
	 * Delete records by primary key. Usage:
	 *
	 * <code>
	 * $finder->deleteByPk($primaryKey); //delete 1 record
	 * $finder->deleteByPk($key1,$key2,...); //delete multiple records
	 * $finder->deleteByPk(array($key1,$key2,...)); //delete multiple records
	 * </code>
	 *
	 * For composite primary keys (determined from the table definitions):
	 * <code>
	 * $finder->deleteByPk(array($key1,$key2)); //delete 1 record
	 *
	 * //delete multiple records
	 * $finder->deleteByPk(array($key1,$key2), array($key3,$key4),...);
	 *
	 * //delete multiple records
	 * $finder->deleteByPk(array( array($key1,$key2), array($key3,$key4), .. ));
	 * </code>
	 *
	 * @param mixed primary key values.
	 * @return int number of records deleted.
	 */
	public function deleteByPk($keys)
	{
		if(func_num_args() > 1)
			$keys = func_get_args();
		$gateway = $this->getRecordManager()->getRecordGateway();
		return $gateway->deleteRecordsByPk($this,(array)$keys);
	}


	/**
	 * Delete multiple records using a criteria.
	 * @param string|TActiveRecordCriteria SQL condition or criteria object.
	 * @param mixed parameter values.
	 * @return int number of records deleted.
	 */
	public function deleteAll($criteria, $parameters=array())
	{
		if(is_string($criteria))
		{
			if(!is_array($parameters) && func_num_args() > 1)
			{
				$parameters = func_get_args();
				array_shift($parameters);
			}
			$criteria=new TActiveRecordCriteria($criteria,$parameters);
		}
		$gateway = $this->getRecordManager()->getRecordGateway();
		return $gateway->deleteRecordsByCriteria($this, $criteria);
	}

	/**
	 * Populate the record with data, registers the object as clean.
	 * @param string new record name
	 * @param array name value pair record data
	 * @return TActiveRecord object record, null if data is empty.
	 */
	protected function populateObject($type, $data)
	{
		if(empty($data)) return null;
		$registry = $this->getRecordManager()->getObjectStateRegistry();

		//try the cache (the cache object must be clean)
		if(!is_null($obj = $registry->getCachedInstance($data)))
			return $obj;

		//create and populate the object
		$obj = Prado::createComponent($type);
		foreach($data as $name => $value)
			$obj->{$name} = $value;

		$gateway = $this->getRecordManager()->getRecordGateway();
		$obj->_readOnly = $gateway->getMetaData($this)->getIsView();

		//cache it
		return $registry->addCachedInstance($data,$obj);
	}

	/**
	 * Find one single record that matches the criteria.
	 *
	 * Usage:
	 * <code>
	 * $finder->find('username = :name AND password = :pass',
	 * 					array(':name'=>$name, ':pass'=>$pass));
	 * $finder->find('username = ? AND password = ?', array($name, $pass));
	 * $finder->find('username = ? AND password = ?', $name, $pass);
	 * //$criteria is of TActiveRecordCriteria
	 * $finder->find($criteria); //the 2nd parameter for find() is ignored.
	 * </code>
	 *
	 * @param string|TActiveRecordCriteria SQL condition or criteria object.
	 * @param mixed parameter values.
	 * @return TActiveRecord matching record object.
	 */
	public function find($criteria,$parameters=array())
	{
		if(is_string($criteria))
		{
			if(!is_array($parameters) && func_num_args() > 1)
			{
				$parameters = func_get_args();
				array_shift($parameters);
			}
			$criteria=new TActiveRecordCriteria($criteria,$parameters);
		}
		$gateway = $this->getRecordManager()->getRecordGateway();
		$data = $gateway->findRecordsByCriteria($this,$criteria);
		return $this->populateObject(get_class($this), $data);
	}

	/**
	 * Same as find() but returns an array of objects.
	 *
	 * @param string|TActiveRecordCriteria SQL condition or criteria object.
	 * @param mixed parameter values.
	 * @return array matching record objects
	 */
	public function findAll($criteria=null,$parameters=array())
	{
		if(is_string($criteria))
		{
			if(!is_array($parameters) && func_num_args() > 1)
			{
				$parameters = func_get_args();
				array_shift($parameters);
			}
			$criteria=new TActiveRecordCriteria($criteria,$parameters);
		}
		$gateway = $this->getRecordManager()->getRecordGateway();
		$results = array();
		$class = get_class($this);
		foreach($gateway->findRecordsByCriteria($this,$criteria,true)  as $data)
			$results[] = $this->populateObject($class,$data);
		return $results;
	}

	/**
	 * Find one record using only the primary key or composite primary keys. Usage:
	 *
	 * <code>
	 * $finder->findByPk($primaryKey);
	 * $finder->findByPk($key1, $key2, ...);
	 * $finder->findByPk(array($key1,$key2,...));
	 * </code>
	 *
	 * @param mixed primary keys
	 * @return TActiveRecord
	 */
	public function findByPk($keys)
	{
		if(func_num_args() > 1)
			$keys = func_get_args();
		$gateway = $this->getRecordManager()->getRecordGateway();
		$data = $gateway->findRecordByPK($this,$keys);
		return $this->populateObject(get_class($this), $data);
	}

	/**
	 * Find multiple records matching a list of primary or composite keys.
	 *
	 * For scalar primary keys:
	 * <code>
	 * $finder->findAllByPk($key1, $key2, ...);
	 * $finder->findAllByPk(array($key1, $key2, ...));
	 * </code>
	 *
	 * For composite keys:
	 * <code>
	 * $finder->findAllByPk(array($key1, $key2), array($key3, $key4), ...);
	 * $finder->findAllByPk(array(array($key1, $key2), array($key3, $key4), ...));
	 * </code>
	 * @param mixed primary keys
	 * @return array matching ActiveRecords
	 */
	public function findAllByPks($keys)
	{
		if(func_num_args() > 1)
			$keys = func_get_args();
		$gateway = $this->getRecordManager()->getRecordGateway();
		$results = array();
		$class = get_class($this);
		foreach($gateway->findRecordsByPks($this,(array)$keys) as $data)
			$results[] = $this->populateObject($class,$data);
		return $results;
	}

	/**
	 * Find records using full SQL, returns corresponding record object.
	 * The names of the column retrieved must be defined in your Active Record
	 * class.
	 * @param string select SQL
	 * @param array $parameters
	 * @return array matching active records.
	 */
	public function findBySql($sql,$parameters=array())
	{
		if(!is_array($parameters) && func_num_args() > 1)
		{
			$parameters = func_get_args();
			array_shift($parameters);
		}
		$gateway = $this->getRecordManager()->getRecordGateway();
		$data = $gateway->findRecordsBySql($this,$sql,$parameters);
		$results = array();
		$class = get_class($this);
		foreach($gateway->findRecordsBySql($this,$sql,$parameters) as $data)
			$results[] = $this->populateObject($class,$data);
		return $results;
	}

	/**
	 * Find the number of records.
	 * @param string|TActiveRecordCriteria SQL condition or criteria object.
	 * @param mixed parameter values.
	 * @return int number of records.
	 */
	public function count($criteria=null,$parameters=array())
	{
		if(is_string($criteria))
		{
			if(!is_array($parameters) && func_num_args() > 1)
			{
				$parameters = func_get_args();
				array_shift($parameters);
			}
			$criteria=new TActiveRecordCriteria($criteria,$parameters);
		}
		$gateway = $this->getRecordManager()->getRecordGateway();
		return $gateway->countRecords($this,$criteria);
	}

	/**
	 * Dynamic find method using parts of method name as search criteria.
	 * Method name starting with "findBy" only returns 1 record.
	 * Method name starting with "findAllBy" returns 0 or more records.
	 * Method name starting with "deleteBy" deletes records by the trail criteria.
	 * The condition is taken as part of the method name after "findBy", "findAllBy"
	 * or "deleteBy".
	 *
	 * The following are equivalent:
	 * <code>
	 * $finder->findByName($name)
	 * $finder->find('Name = ?', $name);
	 * </code>
	 * <code>
	 * $finder->findByUsernameAndPassword($name,$pass); // OR may be used
	 * $finder->findBy_Username_And_Password($name,$pass); // _OR_ may be used
	 * $finder->find('Username = ? AND Password = ?', $name, $pass);
	 * </code>
	 * <code>
	 * $finder->findAllByAge($age);
	 * $finder->findAll('Age = ?', $age);
	 * </code>
	 * <code>
	 * $finder->deleteAll('Name = ?', $name);
	 * $finder->deleteByName($name);
	 * </code>
	 * @return mixed single record if method name starts with "findBy", 0 or more records
	 * if method name starts with "findAllBy"
	 */
	public function __call($method,$args)
	{
		$delete =false;
		if($findOne = substr(strtolower($method),0,6)==='findby')
			$condition = $method[6]==='_' ? substr($method,7) : substr($method,6);
		else if(substr(strtolower($method),0,9)==='findallby')
			$condition = $method[9]==='_' ? substr($method,10) : substr($method,9);
		else if($delete = substr(strtolower($method),0,8)==='deleteby')
			$condition = $method[8]==='_' ? substr($method,9) : substr($method,8);
		else
			return null;//throw new TActiveRecordException('ar_invalid_finder_method',$method);

		$criteria = $this->createCriteriaFromString($method, $condition, $args);
		if($delete)
			return $this->deleteAll($criteria);
		else
			return $findOne ? $this->find($criteria) : $this->findAll($criteria);
	}

	/**
	 * @param string __call method name
	 * @param string criteria conditions
	 * @param array method arguments
	 * @return TActiveRecordCriteria criteria created from the method name and its arguments.
	 */
	private function createCriteriaFromString($method, $condition, $args)
	{
		$fields = $this->extractMatchingConditions($method, $condition);
		$args=count($args) === 1 && is_array($args[0]) ? $args[0] : $args;
		if(count($fields)>count($args))
		{
			throw new TActiveRecordException('ar_mismatch_args_exception',
				$method,count($fields),count($args));
		}
		return new TActiveRecordCriteria(implode(' ',$fields),$args);
	}

	/**
	 * Calculates the AND/OR condition from dynamic method substrings using
	 * table meta data, allows for any AND-OR combinations.
	 * @param string dynamic method name
	 * @param string dynamic method search criteria
	 * @return array search condition substrings
	 */
	private function extractMatchingConditions($method, $condition)
	{
		$meta = $this->getRecordManager()->getRecordGateway()->getMetaData($this);
		$search = implode('|', $meta->getColumnNames());
		$regexp = '/('.$search.')(and|_and_|or|_or_)?/i';
		$matches = array();
		if(!preg_match_all($regexp, strtolower($condition), $matches,PREG_SET_ORDER))
		{
			throw new TActiveRecordException('ar_mismatch_column_names',
				$method, implode(', ', $meta->getColumnNames()), $meta->getTableName());
		}
		$fields = array();
		foreach($matches as $match)
		{
			$sql = $meta->getColumn($match[1])->getName() . ' = ? ';
			if(count($match) > 2)
				$sql .= strtoupper(str_replace('_', '', $match[2]));
			$fields[] = $sql;
		}
		return $fields;
	}
}
?>