Yii Framework v1.1.10 Class Reference

CActiveFinder

Package system.db.ar
Inheritance class CActiveFinder » CComponent
Since 1.0
Version $Id: CActiveFinder.php 3562 2012-02-13 01:27:06Z qiang.xue $
Source Code framework/db/ar/CActiveFinder.php
CActiveFinder implements eager loading and lazy loading of related active records.

When used in eager loading, this class provides the same set of find methods as CActiveRecord.

Public Properties

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PropertyTypeDescriptionDefined By
baseLimited boolean whether the base model has limit or offset. CActiveFinder
joinAll boolean join all tables all at once. CActiveFinder

Public Methods

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MethodDescriptionDefined By
__call() Calls the named method which is not a class method. CComponent
__construct() Constructor. CActiveFinder
__get() Returns a property value, an event handler list or a behavior based on its name. CComponent
__isset() Checks if a property value is null. CComponent
__set() Sets value of a component property. CComponent
__unset() Sets a component property to be null. CComponent
asa() Returns the named behavior object. CComponent
attachBehavior() Attaches a behavior to this component. CComponent
attachBehaviors() Attaches a list of behaviors to the component. CComponent
attachEventHandler() Attaches an event handler to an event. CComponent
canGetProperty() Determines whether a property can be read. CComponent
canSetProperty() Determines whether a property can be set. CComponent
count() This method is internally called. CActiveFinder
detachBehavior() Detaches a behavior from the component. CComponent
detachBehaviors() Detaches all behaviors from the component. CComponent
detachEventHandler() Detaches an existing event handler. CComponent
disableBehavior() Disables an attached behavior. CComponent
disableBehaviors() Disables all behaviors attached to this component. CComponent
enableBehavior() Enables an attached behavior. CComponent
enableBehaviors() Enables all behaviors attached to this component. CComponent
evaluateExpression() Evaluates a PHP expression or callback under the context of this component. CComponent
findAllBySql() This method is internally called. CActiveFinder
findBySql() This method is internally called. CActiveFinder
getEventHandlers() Returns the list of attached event handlers for an event. CComponent
hasEvent() Determines whether an event is defined. CComponent
hasEventHandler() Checks whether the named event has attached handlers. CComponent
hasProperty() Determines whether a property is defined. CComponent
lazyFind() Finds the related objects for the specified active record. CActiveFinder
query() Do not call this method. This method is used internally to perform the relational query CActiveFinder
raiseEvent() Raises an event. CComponent

Property Details

baseLimited property
public boolean $baseLimited;

whether the base model has limit or offset. This property is internally used.

joinAll property
public boolean $joinAll;

join all tables all at once. Defaults to false. This property is internally used.

Method Details

__construct() method
public void __construct(CActiveRecord $model, mixed $with)
$model CActiveRecord the model that initiates the active finding process
$with mixed the relation names to be actively looked for
Source Code: framework/db/ar/CActiveFinder.php#45 (show)
public function __construct($model,$with)
{
    $this->_builder=$model->getCommandBuilder();
    $this->_joinTree=new CJoinElement($this,$model);
    $this->buildJoinTree($this->_joinTree,$with);
}

Constructor. A join tree is built up based on the declared relationships between active record classes.

count() method
public string count(CDbCriteria $criteria)
$criteria CDbCriteria the query criteria
{return} string
Source Code: framework/db/ar/CActiveFinder.php#146 (show)
public function count($criteria)
{
    Yii::trace(get_class($this->_joinTree->model).'.count() eagerly','system.db.ar.CActiveRecord');
    $this->joinAll=$criteria->together!==true;

    $alias=$criteria->alias===null ? 't' : $criteria->alias;
    $this->_joinTree->tableAlias=$alias;
    $this->_joinTree->rawTableAlias=$this->_builder->getSchema()->quoteTableName($alias);

    $n=$this->_joinTree->count($criteria);
    $this->destroyJoinTree();
    return $n;
}

This method is internally called.

findAllBySql() method
public CActiveRecord[] findAllBySql(string $sql, array $params=array ( ))
$sql string the SQL statement
$params array parameters to be bound to the SQL statement
{return} CActiveRecord[]
Source Code: framework/db/ar/CActiveFinder.php#122 (show)
public function findAllBySql($sql,$params=array())
{
    Yii::trace(get_class($this->_joinTree->model).'.findAllBySql() eagerly','system.db.ar.CActiveRecord');
    if(($rows=$this->_builder->createSqlCommand($sql,$params)->queryAll())!==array())
    {
        $baseRecords=$this->_joinTree->model->populateRecords($rows,false);
        $this->_joinTree->beforeFind(false);
        $this->_joinTree->findWithBase($baseRecords);
        $this->_joinTree->afterFind();
        $this->destroyJoinTree();
        return $baseRecords;
    }
    else
    {
        $this->destroyJoinTree();
        return array();
    }
}

This method is internally called.

findBySql() method
public CActiveRecord findBySql(string $sql, array $params=array ( ))
$sql string the SQL statement
$params array parameters to be bound to the SQL statement
{return} CActiveRecord
Source Code: framework/db/ar/CActiveFinder.php#100 (show)
public function findBySql($sql,$params=array())
{
    Yii::trace(get_class($this->_joinTree->model).'.findBySql() eagerly','system.db.ar.CActiveRecord');
    if(($row=$this->_builder->createSqlCommand($sql,$params)->queryRow())!==false)
    {
        $baseRecord=$this->_joinTree->model->populateRecord($row,false);
        $this->_joinTree->beforeFind(false);
        $this->_joinTree->findWithBase($baseRecord);
        $this->_joinTree->afterFind();
        $this->destroyJoinTree();
        return $baseRecord;
    }
    else
        $this->destroyJoinTree();
}

This method is internally called.

lazyFind() method
public void lazyFind(CActiveRecord $baseRecord)
$baseRecord CActiveRecord the base record whose related objects are to be loaded
Source Code: framework/db/ar/CActiveFinder.php#165 (show)
public function lazyFind($baseRecord)
{
    $this->_joinTree->lazyFind($baseRecord);
    if(!empty($this->_joinTree->children))
    {
        $child=reset($this->_joinTree->children);
        $child->afterFind();
    }
    $this->destroyJoinTree();
}

Finds the related objects for the specified active record. This method is internally invoked by CActiveRecord to support lazy loading.

query() method
public mixed query(CDbCriteria $criteria, boolean $all=false)
$criteria CDbCriteria the DB criteria
$all boolean whether to bring back all records
{return} mixed the query result
Source Code: framework/db/ar/CActiveFinder.php#59 (show)
public function query($criteria,$all=false)
{
    $this->joinAll=$criteria->together===true;
    $this->_joinTree->beforeFind(false);

    if($criteria->alias!='')
    {
        $this->_joinTree->tableAlias=$criteria->alias;
        $this->_joinTree->rawTableAlias=$this->_builder->getSchema()->quoteTableName($criteria->alias);
    }

    $this->_joinTree->find($criteria);
    $this->_joinTree->afterFind();

    if($all)
    {
        $result = array_values($this->_joinTree->records);
        if ($criteria->index!==null)
        {
            $index=$criteria->index;
            $array=array();
            foreach($result as $object)
                $array[$object->$index]=$object;
            $result=$array;
        }
    }
    else if(count($this->_joinTree->records))
        $result = reset($this->_joinTree->records);
    else
        $result = null;

    $this->destroyJoinTree();
    return $result;
}

Do not call this method. This method is used internally to perform the relational query based on the given DB criteria.

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