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<?php
/**
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db;
/**
* ActiveQuery represents a DB query associated with an Active Record class.
*
* ActiveQuery instances are usually created by [[ActiveRecord::find()]] and [[ActiveRecord::findBySql()]].
*
* ActiveQuery mainly provides the following methods to retrieve the query results:
*
* - [[one()]]: returns a single record populated with the first row of data.
* - [[all()]]: returns all records based on the query results.
* - [[count()]]: returns the number of records.
* - [[sum()]]: returns the sum over the specified column.
* - [[average()]]: returns the average over the specified column.
* - [[min()]]: returns the min over the specified column.
* - [[max()]]: returns the max over the specified column.
* - [[scalar()]]: returns the value of the first column in the first row of the query result.
* - [[exists()]]: returns a value indicating whether the query result has data or not.
*
* Because ActiveQuery extends from [[Query]], one can use query methods, such as [[where()]],
* [[orderBy()]] to customize the query options.
*
* ActiveQuery also provides the following additional query options:
*
* - [[with()]]: list of relations that this query should be performed with.
* - [[indexBy()]]: the name of the column by which the query result should be indexed.
* - [[asArray()]]: whether to return each record as an array.
*
* These options can be configured using methods of the same name. For example:
*
* ~~~
* $customers = Customer::find()->with('orders')->asArray()->all();
* ~~~
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Carsten Brandt <mail@cebe.cc>
* @since 2.0
*/
class ActiveQuery extends Query implements ActiveQueryInterface
{
use ActiveQueryTrait;
/**
* @var string the SQL statement to be executed for retrieving AR records.
* This is set by [[ActiveRecord::findBySql()]].
*/
public $sql;
/**
* Executes query and returns all results as an array.
* @param Connection $db the DB connection used to create the DB command.
* If null, the DB connection returned by [[modelClass]] will be used.
* @return array the query results. If the query results in nothing, an empty array will be returned.
*/
public function all($db = null)
{
$command = $this->createCommand($db);
$rows = $command->queryAll();
if (!empty($rows)) {
$models = $this->createModels($rows);
if (!empty($this->with)) {
$this->findWith($this->with, $models);
}
return $models;
} else {
return [];
}
}
/**
* Executes query and returns a single row of result.
* @param Connection $db the DB connection used to create the DB command.
* If null, the DB connection returned by [[modelClass]] will be used.
* @return ActiveRecord|array|null a single row of query result. Depending on the setting of [[asArray]],
* the query result may be either an array or an ActiveRecord object. Null will be returned
* if the query results in nothing.
*/
public function one($db = null)
{
$command = $this->createCommand($db);
$row = $command->queryOne();
if ($row !== false) {
if ($this->asArray) {
$model = $row;
} else {
/** @var ActiveRecord $class */
$class = $this->modelClass;
$model = $class::create($row);
}
if (!empty($this->with)) {
$models = [$model];
$this->findWith($this->with, $models);
$model = $models[0];
}
return $model;
} else {
return null;
}
}
/**
* Creates a DB command that can be used to execute this query.
* @param Connection $db the DB connection used to create the DB command.
* If null, the DB connection returned by [[modelClass]] will be used.
* @return Command the created DB command instance.
*/
public function createCommand($db = null)
{
/** @var ActiveRecord $modelClass */
$modelClass = $this->modelClass;
if ($db === null) {
$db = $modelClass::getDb();
}
$params = $this->params;
if ($this->sql === null) {
if ($this->from === null) {
$tableName = $modelClass::tableName();
if ($this->select === null && !empty($this->join)) {
$this->select = ["$tableName.*"];
}
$this->from = [$tableName];
}
list ($this->sql, $params) = $db->getQueryBuilder()->build($this);
}
return $db->createCommand($this->sql, $params);
}
}