<?php
/**
* ActiveFinder class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @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\VectorIterator;
use yii\db\dao\Expression;
use yii\db\Exception;
/**
* 1. eager loading, base limited and has has_many relations
* 2.
* ActiveFinder.php is ...
*
* @property integer $count
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class ActiveQuery extends BaseActiveQuery implements \IteratorAggregate, \ArrayAccess, \Countable
{
/**
* @var string the SQL statement to be executed to retrieve primary records.
* This is set by [[ActiveRecord::findBySql()]].
*/
public $sql;
/**
* @var array list of query results
*/
public $records;
/**
* @param string $modelClass the name of the ActiveRecord class.
*/
public function __construct($modelClass)
{
$this->modelClass = $modelClass;
}
public function __call($name, $params)
{
$class = $this->modelClass;
$scopes = $class::scopes();
if (isset($scopes[$name])) {
array_unshift($params, $this);
return call_user_func_array($scopes[$name], $params);
} else {
return parent::__call($name, $params);
}
}
/**
* Executes query and returns all results as an array.
* @return array the query results. If the query results in nothing, an empty array will be returned.
*/
public function all()
{
if ($this->records === null) {
$this->records = $this->findRecords();
}
return $this->records;
}
/**
* Executes query and returns a single row of result.
* @return null|array|ActiveRecord the single row of query result. Depending on the setting of [[asArray]],
* the query result may be either an array or an ActiveRecord object. Null will be returned
* if the query results in nothing.
*/
public function one()
{
if ($this->records === null) {
$this->limit = 1;
$this->records = $this->findRecords();
}
return isset($this->records[0]) ? $this->records[0] : null;
}
/**
* Returns a scalar value for this query.
* The value returned will be the first column in the first row of the query results.
* @return string|boolean the value of the first column in the first row of the query result.
* False is returned if there is no value.
*/
public function value()
{
return $this->createFinder()->find($this, true);
}
public function exists()
{
return $this->select(array(new Expression('1')))->value() !== false;
}
/**
* Returns the database connection used by this query.
* This method returns the connection used by the [[modelClass]].
* @return \yii\db\dao\Connection the database connection used by this query
*/
public function getDbConnection()
{
$class = $this->modelClass;
return $class::getDbConnection();
}
/**
* Returns the number of items in the vector.
* @return integer the number of items in the vector
*/
public function getCount()
{
return $this->count();
}
/**
* Sets the parameters about query caching.
* This is a shortcut method to {@link CDbConnection::cache()}.
* It changes the query caching parameter of the {@link dbConnection} instance.
* @param integer $duration the number of seconds that query results may remain valid in cache.
* If this is 0, the caching will be disabled.
* @param CCacheDependency $dependency the dependency that will be used when saving the query results into cache.
* @param integer $queryCount number of SQL queries that need to be cached after calling this method. Defaults to 1,
* meaning that the next SQL query will be cached.
* @return ActiveRecord the active record instance itself.
*/
public function cache($duration, $dependency = null, $queryCount = 1)
{
$this->getDbConnection()->cache($duration, $dependency, $queryCount);
return $this;
}
/**
* Returns an iterator for traversing the items in the vector.
* This method is required by the SPL interface `IteratorAggregate`.
* It will be implicitly called when you use `foreach` to traverse the vector.
* @return VectorIterator an iterator for traversing the items in the vector.
*/
public function getIterator()
{
if ($this->records === null) {
$this->records = $this->findRecords();
}
return new VectorIterator($this->records);
}
/**
* Returns the number of items in the vector.
* This method is required by the SPL `Countable` interface.
* It will be implicitly called when you use `count($vector)`.
* @return integer number of items in the vector.
*/
public function count()
{
if ($this->records === null) {
$this->records = $this->findRecords();
}
return count($this->records);
}
/**
* Returns a value indicating whether there is an item at the specified offset.
* This method is required by the SPL interface `ArrayAccess`.
* It is implicitly called when you use something like `isset($vector[$offset])`.
* @param integer $offset the offset to be checked
* @return boolean whether there is an item at the specified offset.
*/
public function offsetExists($offset)
{
if ($this->records === null) {
$this->records = $this->findRecords();
}
return isset($this->records[$offset]);
}
/**
* Returns the item at the specified offset.
* This method is required by the SPL interface `ArrayAccess`.
* It is implicitly called when you use something like `$value = $vector[$offset];`.
* This is equivalent to [[itemAt]].
* @param integer $offset the offset to retrieve item.
* @return ActiveRecord the item at the offset
* @throws Exception if the offset is out of range
*/
public function offsetGet($offset)
{
if ($this->records === null) {
$this->records = $this->findRecords();
}
return isset($this->records[$offset]) ? $this->records[$offset] : null;
}
/**
* Sets the item at the specified offset.
* This method is required by the SPL interface `ArrayAccess`.
* It is implicitly called when you use something like `$vector[$offset] = $item;`.
* If the offset is null or equal to the number of the existing items,
* the new item will be appended to the vector.
* Otherwise, the existing item at the offset will be replaced with the new item.
* @param integer $offset the offset to set item
* @param ActiveRecord $item the item value
* @throws Exception if the offset is out of range, or the vector is read only.
*/
public function offsetSet($offset, $item)
{
if ($this->records === null) {
$this->records = $this->findRecords();
}
$this->records[$offset] = $item;
}
/**
* Unsets the item at the specified offset.
* This method is required by the SPL interface `ArrayAccess`.
* It is implicitly called when you use something like `unset($vector[$offset])`.
* This is equivalent to [[removeAt]].
* @param integer $offset the offset to unset item
* @throws Exception if the offset is out of range, or the vector is read only.
*/
public function offsetUnset($offset)
{
if ($this->records === null) {
$this->records = $this->findRecords();
}
unset($this->records[$offset]);
}
protected function findRecords()
{
return $this->createFinder()->find($this);
}
protected function createFinder()
{
return new ActiveFinder($this->getDbConnection());
}
}