* @link http://www.yiiframework.com/ * @copyright Copyright © 2008-2012 Yii Software LLC * @license http://www.yiiframework.com/license/ */ namespace yii\db\ar; use yii\base\Model; use yii\base\Event; use yii\base\ModelEvent; use yii\db\Exception; use yii\db\dao\Connection; use yii\db\dao\TableSchema; use yii\db\dao\Query; use yii\db\dao\Expression; use yii\util\Text; /** * ActiveRecord is the base class for classes representing relational data. * * @author Qiang Xue * @since 2.0 * * @property array $attributes */ abstract class ActiveRecord extends Model { /** * @var array attribute values indexed by attribute names */ private $_attributes = array(); /** * @var array old attribute values indexed by attribute names. */ private $_oldAttributes; /** * @var array related records indexed by relation names. */ private $_related; /** * Returns the metadata for this AR class. * @param boolean $refresh whether to rebuild the metadata. * @return ActiveMetaData the meta for this AR class. */ public static function getMetaData($refresh = false) { return ActiveMetaData::getInstance(get_called_class(), $refresh); } /** * Returns the database connection used by this AR class. * By default, the "db" application component is used as the database connection. * You may override this method if you want to use a different database connection. * @return Connection the database connection used by this AR class. */ public static function getDbConnection() { return \Yii::$application->getDb(); } /** * Creates an [[ActiveQuery]] instance for query purpose. * * Because [[ActiveQuery]] implements a set of query building methods, * additional query conditions can be specified by calling the methods of [[ActiveQuery]]. * * Below are some usage examples: * * ~~~ * // find all customers * $customers = Customer::find()->all(); * // find a single customer whose primary key value is 10 * $customer = Customer::find(10)->one(); * // find all active customers and order them by their age: * $customers = Customer::find() * ->where(array('status' => 1)) * ->orderBy('age') * ->all(); * // or alternatively: * $customers = Customer::find(array( * 'where' => array('status' => 1), * 'orderBy' => 'age', * ))->all(); * ~~~ * * @param mixed $q the query parameter. This can be one of the followings: * * - a scalar value (integer or string): query by a single primary key value. * - an array of name-value pairs: it will be used to configure the [[ActiveQuery]] object. * * @return ActiveQuery the [[ActiveQuery]] instance for query purpose. */ public static function find($q = null) { $query = static::createActiveQuery(); if (is_array($q)) { foreach ($q as $name => $value) { $query->$name = $value; } } elseif ($q !== null) { // query by primary key $primaryKey = static::getMetaData()->table->primaryKey; $query->where(array($primaryKey[0] => $q)); } return $query; } /** * Creates an [[ActiveQuery]] instance and query by a given SQL statement. * Note that because the SQL statement is already specified, calling further * query methods (such as `where()`, `orderBy()`) on [[ActiveQuery]] will have no effect. * Methods such as `with()`, `asArray()` can still be called though. * @param string $sql the SQL statement to be executed * @param array $params parameters to be bound to the SQL statement during execution. * @return ActiveQuery the [[ActiveQuery]] instance */ public static function findBySql($sql, $params = array()) { $query = static::createActiveQuery(); $query->sql = $sql; return $query->params($params); } /** * Performs a COUNT query for this AR class. * * Below are some usage examples: * * ~~~ * // count the total number of customers * echo Customer::count(); * // count the number of customers whose primary key value is 10. * echo Customer::count(10); * // count the number of active customers: * echo Customer::count(array( * 'where' => array('status' => 1), * )); * ~~~ * * @param mixed $q the query parameter. This can be one of the followings: * * - a scalar value (integer or string): query by a single primary key value. * - an array of name-value pairs: it will be used to configure the [[ActiveQuery]] object for query purpose. * * @return integer the counting result */ public static function count($q = null) { $query = static::createActiveQuery(); if (is_array($q)) { foreach ($q as $name => $value) { $query->$name = $value; } } elseif ($q !== null) { // query by primary key $primaryKey = static::getMetaData()->table->primaryKey; $query->where(array($primaryKey[0] => $q)); } if ($query->select === null) { $query->select = 'COUNT(*)'; } return $query->value(); } /** * Updates the whole table using the provided attribute values and conditions. * @param array $attributes attribute values to be saved into the table * @param string|array $condition the conditions that will be put in the WHERE part. * Please refer to [[Query::where()]] on how to specify this parameter. * @param array $params the parameters (name=>value) to be bound to the query. * @return integer the number of rows updated */ public static function updateAll($attributes, $condition = '', $params = array()) { $query = new Query; $query->update(static::tableName(), $attributes, $condition, $params); return $query->createCommand(static::getDbConnection())->execute(); } /** * Updates the whole table using the provided counter values and conditions. * @param array $counters the counters to be updated (attribute name => increment value). * @param string|array $condition the conditions that will be put in the WHERE part. * Please refer to [[Query::where()]] on how to specify this parameter. * @param array $params the parameters (name=>value) to be bound to the query. * @return integer the number of rows updated */ public static function updateAllCounters($counters, $condition = '', $params = array()) { $db = static::getDbConnection(); foreach ($counters as $name => $value) { $value = (int)$value; $quotedName = $db->quoteColumnName($name, true); $counters[$name] = new Expression($value >= 0 ? "$quotedName+$value" : "$quotedName$value"); } $query = new Query; $query->update(static::tableName(), $counters, $condition, $params); return $query->createCommand($db)->execute(); } /** * Deletes rows in the table using the provided conditions. * @param string|array $condition the conditions that will be put in the WHERE part. * Please refer to [[Query::where()]] on how to specify this parameter. * @param array $params the parameters (name=>value) to be bound to the query. * @return integer the number of rows updated */ public static function deleteAll($condition = '', $params = array()) { $query = new Query; $query->delete(static::tableName(), $condition, $params); return $query->createCommand(static::getDbConnection())->execute(); } /** * Creates a [[ActiveQuery]] instance. * This method is called by [[find()]] and [[findBySql()]] to start a SELECT query. * @return ActiveQuery the newly created [[ActiveQuery]] instance. */ public static function createActiveQuery() { return new ActiveQuery(get_called_class()); } /** * Declares the name of the database table associated with this AR class. * By default this method returns the class name as the table name by calling [[Text::camel2id()]]. * For example, 'Customer' becomes 'customer', and 'OrderDetail' becomes 'order_detail'. * You may override this method if the table is not named after this convention. * @return string the table name */ public static function tableName() { return Text::camel2id(basename(get_called_class()), '_'); } /** * Declares the primary key name for this AR class. * This method is meant to be overridden in case when the table has no primary key defined * (for some legacy database). If the table already has a primary key, * you do not need to override this method. The default implementation simply returns null, * meaning using the primary key defined in the database table. * @return string|array the primary key of the associated database table. * If the key is a single column, it should return the column name; * If the key is a composite one consisting of several columns, it should * return the array of the key column names. */ public static function primaryKey() { } /** * Declares the relations for this AR class. * * Child classes may override this method to specify their relations. * * The following code shows how to declare relations for a `Programmer` AR class: * * ~~~ * return array( * 'manager:Manager' => '@.id = ?.manager_id', * 'assignments:Assignment[]' => array( * 'on' => '@.owner_id = ?.id AND @.status = 1', * 'orderBy' => '@.create_time DESC', * ), * 'projects:Project[]' => array( * 'via' => 'assignments', * 'on' => '@.id = ?.project_id', * ), * ); * ~~~ * * This method should be overridden to declare related objects. * * There are four types of relations that may exist between two active record objects: * * * Besides the above relation types, a special relation called STAT is also supported * that can be used to perform statistical query (or aggregational query). * It retrieves the aggregational information about the related objects, such as the number * of comments for each post, the average rating for each product, etc. * * Each kind of related objects is defined in this method as an array with the following elements: *
	 * 'varName'=>array('relationType', 'className', 'foreign_key', ...additional options)
	 * 
* where 'varName' refers to the name of the variable/property that the related object(s) can * be accessed through; 'relationType' refers to the type of the relation, which can be one of the * following four constants: self::BELONGS_TO, self::HAS_ONE, self::HAS_MANY and self::MANY_MANY; * 'className' refers to the name of the active record class that the related object(s) is of; * and 'foreign_key' states the foreign key that relates the two kinds of active record. * Note, for composite foreign keys, they must be listed together, separated by commas; * and for foreign keys used in MANY_MANY relation, the joining table must be declared as well * (e.g. 'join_table(fk1, fk2)'). * * Additional options may be specified as name-value pairs in the rest array elements: * * * The following options are available for certain relations when lazy loading: * * * Below is an example declaring related objects for 'Post' active record class: *
	 * return array(
	 *	 'author'=>array(self::BELONGS_TO, 'User', 'author_id'),
	 *	 'comments'=>array(self::HAS_MANY, 'Comment', 'post_id', 'with'=>'author', 'order'=>'create_time DESC'),
	 *	 'tags'=>array(self::MANY_MANY, 'Tag', 'post_tag(post_id, tag_id)', 'order'=>'name'),
	 * );
	 * 
* * @return array list of related object declarations. Defaults to empty array. */ public static function relations() { return array(); } /** * Returns the default named scope that should be implicitly applied to all queries for this model. * Note, default scope only applies to SELECT queries. It is ignored for INSERT, UPDATE and DELETE queries. * The default implementation simply returns an empty array. You may override this method * if the model needs to be queried with some default criteria (e.g. only active records should be returned). * @param BaseActiveQuery * @return BaseActiveQuery the query criteria. This will be used as the parameter to the constructor * of {@link CDbCriteria}. */ public static function defaultScope($query) { return $query; } /** * Returns the declaration of named scopes. * A named scope represents a query criteria that can be chained together with * other named scopes and applied to a query. This method should be overridden * by child classes to declare named scopes for the particular AR classes. * For example, the following code declares two named scopes: 'recently' and * 'published'. *
	 * return array(
	 *	 'published'=>array(
	 *		   'condition'=>'status=1',
	 *	 ),
	 *	 'recently'=>array(
	 *		   'order'=>'create_time DESC',
	 *		   'limit'=>5,
	 *	 ),
	 * );
	 * 
* If the above scopes are declared in a 'Post' model, we can perform the following * queries: *
	 * $posts=Post::model()->published()->findAll();
	 * $posts=Post::model()->published()->recently()->findAll();
	 * $posts=Post::model()->published()->with('comments')->findAll();
	 * 
* Note that the last query is a relational query. * * @return array the scope definition. The array keys are scope names; the array * values are the corresponding scope definitions. Each scope definition is represented * as an array whose keys must be properties of {@link CDbCriteria}. */ public static function scopes() { return array(); } /** * PHP getter magic method. * This method is overridden so that attributes and related objects can be accessed like properties. * @param string $name property name * @return mixed property value * @see getAttribute */ public function __get($name) { if (isset($this->_attributes[$name])) { return $this->_attributes[$name]; } $md = $this->getMetaData(); if (isset($md->table->columns[$name])) { return null; } elseif (isset($md->relations[$name])) { if (array_key_exists($name, $this->_related)) { return $this->_related[$name]; } else { return $this->_related[$name] = $this->findByRelation($md->relations[$name]); } } return parent::__get($name); } /** * PHP setter magic method. * This method is overridden so that AR attributes can be accessed like properties. * @param string $name property name * @param mixed $value property value */ public function __set($name, $value) { $md = $this->getMetaData(); if (isset($md->table->columns[$name])) { $this->_attributes[$name] = $value; } elseif (isset($md->relations[$name])) { $this->_related[$name] = $value; } else { parent::__set($name, $value); } } /** * Checks if a property value is null. * This method overrides the parent implementation by checking * if the named attribute is null or not. * @param string $name the property name or the event name * @return boolean whether the property value is null */ public function __isset($name) { if (isset($this->_attributes[$name]) || isset($this->_related[$name])) { return true; } $md = $this->getMetaData(); if (isset($md->table->columns[$name]) || isset($md->relations[$name])) { return false; } else { return parent::__isset($name); } } /** * Sets a component property to be null. * This method overrides the parent implementation by clearing * the specified attribute value. * @param string $name the property name or the event name */ public function __unset($name) { $md = $this->getMetaData(); if (isset($md->table->columns[$name])) { unset($this->_attributes[$name]); } elseif (isset($md->relations[$name])) { unset($this->_related[$name]); } else { parent::__unset($name); } } /** * Calls the named method which is not a class method. * Do not call this method. This is a PHP magic method that we override * to implement the named scope feature. * @param string $name the method name * @param array $params method parameters * @return mixed the method return value */ public function __call($name, $params) { $md = $this->getMetaData(); if (isset($md->relations[$name])) { return $this->findByRelation($md->relations[$name], isset($params[0]) ? $params[0] : array()); } return parent::__call($name, $params); } /** * Initializes the internal storage for the relation. * This method is internally used by [[ActiveQuery]] when populating relation data. * @param ActiveRelation $relation the relation object */ public function initRelation($relation) { $this->_related[$relation->name] = $relation->hasMany ? array() : null; } public function addRelatedRecord($relation, $record) { if ($relation->hasMany) { $this->_related[$relation->name][] = $record; } else { $this->_related[$relation->name] = $record; } } /** * Returns the related record(s). * This method will return the related record(s) of the current record. * If the relation is HAS_ONE or BELONGS_TO, it will return a single object * or null if the object does not exist. * If the relation is HAS_MANY or MANY_MANY, it will return an array of objects * or an empty array. * @param ActiveRelation|string $relation the relation object or the name of the relation * @param array $params additional parameters that customize the query conditions as specified in the relation declaration. * @return mixed the related object(s). * @throws Exception if the relation is not specified in [[relations()]]. */ public function findByRelation($relation, $params = array()) { if (is_string($relation)) { $md = $this->getMetaData(); if (!isset($md->relations[$relation])) { throw new Exception(get_class($this) . ' has no relation named "' . $relation . '".'); } $relation = $md->relations[$relation]; } $query = $this->createActiveQuery(); return $query->findRelatedRecords($this, $relation, $params); } /** * Returns the list of all attribute names of the model. * This would return all column names of the table associated with this AR class. * @return array list of attribute names. */ public function attributeNames() { return array_keys($this->getMetaData()->table->columns); } /** * Returns the named attribute value. * If this is a new record and the attribute is not set before, * the default column value will be returned. * If this record is the result of a query and the attribute is not loaded, * null will be returned. * You may also use $this->AttributeName to obtain the attribute value. * @param string $name the attribute name * @return mixed the attribute value. Null if the attribute is not set or does not exist. * @see hasAttribute */ public function getAttribute($name) { return isset($this->_attributes[$name]) ? $this->_attributes[$name] : null; } /** * Sets the named attribute value. * You may also use $this->AttributeName to set the attribute value. * @param string $name the attribute name * @param mixed $value the attribute value. * @see hasAttribute */ public function setAttribute($name, $value) { $this->_attributes[$name] = $value; } /** * Returns all column attribute values. * Note, related objects are not returned. * @param null|array $names names of attributes whose value needs to be returned. * If this is true (default), then all attribute values will be returned, including * those that are not loaded from DB (null will be returned for those attributes). * If this is null, all attributes except those that are not loaded from DB will be returned. * @return array attribute values indexed by attribute names. */ public function getAttributes($names = null) { if ($names === null) { $names = $this->attributeNames(); } $values = array(); foreach ($names as $name) { $values[$name] = isset($this->_attributes[$name]) ? $this->_attributes[$name] : null; } return $values; } public function getChangedAttributes($names = null) { if ($names === null) { $names = $this->attributeNames(); } $names = array_flip($names); $attributes = array(); if ($this->_oldAttributes === null) { foreach ($this->_attributes as $name => $value) { if (isset($names[$name])) { $attributes[$name] = $value; } } } else { foreach ($this->_attributes as $name => $value) { if (isset($names[$name]) && (!array_key_exists($name, $this->_oldAttributes) || $value !== $this->_oldAttributes[$name])) { $attributes[$name] = $value; } } } return $attributes; } /** * Saves the current record. * * The record is inserted as a row into the database table if its {@link isNewRecord} * property is true (usually the case when the record is created using the 'new' * operator). Otherwise, it will be used to update the corresponding row in the table * (usually the case if the record is obtained using one of those 'find' methods.) * * Validation will be performed before saving the record. If the validation fails, * the record will not be saved. You can call {@link getErrors()} to retrieve the * validation errors. * * If the record is saved via insertion, its {@link isNewRecord} property will be * set false, and its {@link scenario} property will be set to be 'update'. * And if its primary key is auto-incremental and is not set before insertion, * the primary key will be populated with the automatically generated key value. * * @param boolean $runValidation whether to perform validation before saving the record. * If the validation fails, the record will not be saved to database. * @param array $attributes list of attributes that need to be saved. Defaults to null, * meaning all attributes that are loaded from DB will be saved. * @return boolean whether the saving succeeds */ public function save($runValidation = true, $attributes = null) { if (!$runValidation || $this->validate($attributes)) { return $this->getIsNewRecord() ? $this->insert($attributes) : $this->update($attributes); } return false; } /** * Inserts a row into the table based on this active record attributes. * If the table's primary key is auto-incremental and is null before insertion, * it will be populated with the actual value after insertion. * Note, validation is not performed in this method. You may call {@link validate} to perform the validation. * After the record is inserted to DB successfully, its {@link isNewRecord} property will be set false, * and its {@link scenario} property will be set to be 'update'. * @param array $attributes list of attributes that need to be saved. Defaults to null, * meaning all attributes that are loaded from DB will be saved. * @return boolean whether the attributes are valid and the record is inserted successfully. * @throws Exception if the record is not new */ public function insert($attributes = null) { if ($this->beforeInsert()) { $query = new Query; $values = $this->getChangedAttributes($attributes); $db = $this->getDbConnection(); $command = $query->insert($this->tableName(), $values)->createCommand($db); if ($command->execute()) { $table = $this->getMetaData()->table; if ($table->sequenceName !== null) { foreach ($table->primaryKey as $name) { if (!isset($this->_attributes[$name])) { $this->_oldAttributes[$name] = $this->_attributes[$name] = $db->getLastInsertID($table->sequenceName); break; } } } foreach ($values as $name => $value) { $this->_oldAttributes[$name] = $value; } $this->afterInsert(); return true; } } return false; } /** * Updates the row represented by this active record. * All loaded attributes will be saved to the database. * Note, validation is not performed in this method. You may call {@link validate} to perform the validation. * @param array $attributes list of attributes that need to be saved. Defaults to null, * meaning all attributes that are loaded from DB will be saved. * @return boolean whether the update is successful * @throws Exception if the record is new */ public function update($attributes = null) { if ($this->getIsNewRecord()) { throw new Exception('The active record cannot be updated because it is new.'); } if ($this->beforeUpdate()) { $values = $this->getChangedAttributes($attributes); if ($values !== array()) { $this->updateAll($values, $this->getOldPrimaryKey(true)); foreach ($values as $name => $value) { $this->_oldAttributes[$name] = $this->_attributes[$name]; } $this->afterUpdate(); } return true; } else { return false; } } /** * Saves one or several counter columns for the current AR object. * Note that this method differs from [[updateAllCounters()]] in that it only * saves counters for the current AR object. * * An example usage is as follows: * * ~~~ * $post = Post::find($id)->one(); * $post->updateCounters(array('view_count' => 1)); * ~~~ * * Use negative values if you want to decrease the counters. * @param array $counters the counters to be updated (attribute name => increment value) * @return boolean whether the saving is successful * @throws Exception if the record is new or any database error * @see updateAllCounters() */ public function updateCounters($counters) { if ($this->getIsNewRecord()) { throw new Exception('The active record cannot be updated because it is new.'); } $this->updateAllCounters($counters, $this->getOldPrimaryKey(true)); foreach ($counters as $name => $value) { $this->_attributes[$name] += $value; $this->_oldAttributes[$name] = $this->_attributes[$name]; } return true; } /** * Deletes the row corresponding to this active record. * @return boolean whether the deletion is successful. * @throws Exception if the record is new or any database error */ public function delete() { if ($this->getIsNewRecord()) { throw new Exception('The active record cannot be deleted because it is new.'); } if ($this->beforeDelete()) { $result = $this->deleteAll($this->getPrimaryKey(true)) > 0; $this->_oldAttributes = null; $this->afterDelete(); return $result; } else { return false; } } /** * Returns if the current record is new. * @return boolean whether the record is new and should be inserted when calling {@link save}. * This property is automatically set in constructor and {@link populateRecord}. * Defaults to false, but it will be set to true if the instance is created using * the new operator. */ public function getIsNewRecord() { return $this->_oldAttributes === null; } /** * Sets if the record is new. * @param boolean $value whether the record is new and should be inserted when calling {@link save}. * @see getIsNewRecord */ public function setIsNewRecord($value) { $this->_oldAttributes = $value ? null : $this->_attributes; } /** * This event is raised before the record is saved. * By setting [[\yii\base\ModelEvent::isValid]] to be false, the normal [[save()]] will be stopped. * @param \yii\base\ModelEvent $event the event parameter */ public function onBeforeInsert($event) { $this->raiseEvent('onBeforeInsert', $event); } /** * This event is raised after the record is saved. * @param \yii\base\Event $event the event parameter */ public function onAfterInsert($event) { $this->raiseEvent('onAfterInsert', $event); } /** * This event is raised before the record is saved. * By setting [[\yii\base\ModelEvent::isValid]] to be false, the normal [[save()]] will be stopped. * @param \yii\base\ModelEvent $event the event parameter */ public function onBeforeUpdate($event) { $this->raiseEvent('onBeforeUpdate', $event); } /** * This event is raised after the record is saved. * @param \yii\base\Event $event the event parameter */ public function onAfterUpdate($event) { $this->raiseEvent('onAfterUpdate', $event); } /** * This event is raised before the record is deleted. * By setting [[\yii\base\ModelEvent::isValid]] to be false, the normal [[delete()]] process will be stopped. * @param \yii\base\ModelEvent $event the event parameter */ public function onBeforeDelete($event) { $this->raiseEvent('onBeforeDelete', $event); } /** * This event is raised after the record is deleted. * @param \yii\base\Event $event the event parameter */ public function onAfterDelete($event) { $this->raiseEvent('onAfterDelete', $event); } /** * This method is invoked before saving a record (after validation, if any). * The default implementation raises the {@link onBeforeSave} event. * You may override this method to do any preparation work for record saving. * Use {@link isNewRecord} to determine whether the saving is * for inserting or updating record. * Make sure you call the parent implementation so that the event is raised properly. * @return boolean whether the saving should be executed. Defaults to true. */ public function beforeInsert() { $event = new ModelEvent($this); $this->onBeforeInsert($event); return $event->isValid; } /** * This method is invoked after saving a record successfully. * The default implementation raises the {@link onAfterSave} event. * You may override this method to do postprocessing after record saving. * Make sure you call the parent implementation so that the event is raised properly. */ public function afterInsert() { $this->onAfterInsert(new Event($this)); } /** * This method is invoked before saving a record (after validation, if any). * The default implementation raises the {@link onBeforeSave} event. * You may override this method to do any preparation work for record saving. * Use {@link isNewRecord} to determine whether the saving is * for inserting or updating record. * Make sure you call the parent implementation so that the event is raised properly. * @return boolean whether the saving should be executed. Defaults to true. */ public function beforeUpdate() { $event = new ModelEvent($this); $this->onBeforeUpdate($event); return $event->isValid; } /** * This method is invoked after saving a record successfully. * The default implementation raises the {@link onAfterSave} event. * You may override this method to do postprocessing after record saving. * Make sure you call the parent implementation so that the event is raised properly. */ public function afterUpdate() { $this->onAfterUpdate(new Event($this)); } /** * This method is invoked before deleting a record. * The default implementation raises the {@link onBeforeDelete} event. * You may override this method to do any preparation work for record deletion. * Make sure you call the parent implementation so that the event is raised properly. * @return boolean whether the record should be deleted. Defaults to true. */ public function beforeDelete() { $event = new ModelEvent($this); $this->onBeforeDelete($event); return $event->isValid; } /** * This method is invoked after deleting a record. * The default implementation raises the {@link onAfterDelete} event. * You may override this method to do postprocessing after the record is deleted. * Make sure you call the parent implementation so that the event is raised properly. */ public function afterDelete() { $this->onAfterDelete(new Event($this)); } /** * Repopulates this active record with the latest data. * @param array $attributes * @return boolean whether the row still exists in the database. If true, the latest data will be populated to this active record. */ public function refresh($attributes = null) { if ($this->getIsNewRecord()) { return false; } $record = $this->find()->where($this->getPrimaryKey(true))->one(); if ($record === null) { return false; } if ($attributes === null) { foreach ($this->attributeNames() as $name) { $this->_attributes[$name] = $record->_attributes[$name]; } $this->_oldAttributes = $this->_attributes; } else { foreach ($attributes as $name) { $this->_oldAttributes[$name] = $this->_attributes[$name] = $record->_attributes[$name]; } } return true; } /** * Compares current active record with another one. * The comparison is made by comparing table name and the primary key values of the two active records. * @param ActiveRecord $record record to compare to * @return boolean whether the two active records refer to the same row in the database table. */ public function equals($record) { return $this->tableName() === $record->tableName() && $this->getPrimaryKey() === $record->getPrimaryKey(); } /** * Returns the primary key value. * @param boolean $asArray whether to return the primary key value as an array. If true, * the return value will be an array with column name as key and column value as value. * @return mixed the primary key value. An array (column name=>column value) is returned if the primary key is composite. * If primary key is not defined, null will be returned. */ public function getPrimaryKey($asArray = false) { $table = static::getMetaData()->table; if (count($table->primaryKey) === 1 && !$asArray) { return isset($this->_attributes[$table->primaryKey[0]]) ? $this->_attributes[$table->primaryKey[0]] : null; } else { $values = array(); foreach ($table->primaryKey as $name) { $values[$name] = isset($this->_attributes[$name]) ? $this->_attributes[$name] : null; } return $values; } } /** * Returns the old primary key value. * This refers to the primary key value that is populated into the record * after executing a find method (e.g. find(), findAll()). * The value remains unchanged even if the primary key attribute is manually assigned with a different value. * @param boolean $asArray whether to return the primary key value as an array. If true, * the return value will be an array with column name as key and column value as value. * If this is false (default), a scalar value will be returned for non-composite primary key. * @return string|array the old primary key value. An array (column name=>column value) is returned if the primary key is composite. * If primary key is not defined, null will be returned. */ public function getOldPrimaryKey($asArray = false) { $table = static::getMetaData()->table; if (count($table->primaryKey) === 1 && !$asArray) { return isset($this->_oldAttributes[$table->primaryKey[0]]) ? $this->_oldAttributes[$table->primaryKey[0]] : null; } else { $values = array(); foreach ($table->primaryKey as $name) { $values[$name] = isset($this->_oldAttributes[$name]) ? $this->_oldAttributes[$name] : null; } return $values; } } /** * Creates an active record with the given attributes. * This method is internally used by the find methods. * @param array $row attribute values (column name=>column value) * @return ActiveRecord the newly created active record. The class of the object is the same as the model class. * Null is returned if the input data is false. */ public static function createRecord($row) { $record = static::instantiate($row); $columns = static::getMetaData()->table->columns; foreach ($row as $name => $value) { if (isset($columns[$name])) { $record->_attributes[$name] = $value; } elseif ($record->canSetProperty($name)) { $record->$name = $value; } } $record->_oldAttributes = $record->_attributes; return $record; } /** * Creates an active record instance. * This method is called by [[createRecord()]]. * You may override this method if the instance being created * depends the attributes that are to be populated to the record. * For example, by creating a record based on the value of a column, * you may implement the so-called single-table inheritance mapping. * @param array $row list of attribute values for the active records. * @return ActiveRecord the active record */ public static function instantiate($row) { return static::newInstance(); } /** * Returns whether there is an element at the specified offset. * This method is required by the interface ArrayAccess. * @param mixed $offset the offset to check on * @return boolean */ public function offsetExists($offset) { return $this->__isset($offset); } }