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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.
* - [[column()]]: returns the value of the first column in 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->join) && $this->indexBy === null) {
$models = $this->removeDuplicatedModels($models);
}
if (!empty($this->with)) {
$this->findWith($this->with, $models);
}
return $models;
} else {
return [];
}
}
/**
* Removes duplicated models by checking their primary key values.
* This method is mainly called when a join query is performed, which may cause duplicated rows being returned.
* @param array $models the models to be checked
* @return array the distinctive models
*/
private function removeDuplicatedModels($models)
{
$hash = [];
/** @var ActiveRecord $class */
$class = $this->modelClass;
$pks = $class::primaryKey();
if (count($pks) > 1) {
foreach ($models as $i => $model) {
$key = [];
foreach ($pks as $pk) {
$key[] = $model[$pk];
}
$key = serialize($key);
if (isset($hash[$key])) {
unset($models[$i]);
} else {
$hash[$key] = true;
}
}
} else {
$pk = reset($pks);
foreach ($models as $i => $model) {
$key = $model[$pk];
if (isset($hash[$key])) {
unset($models[$i]);
} else {
$hash[$key] = true;
}
}
}
return array_values($models);
}
/**
* 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 = $modelClass::getDb();
}
if ($this->sql === null) {
$select = $this->select;
$from = $this->from;
if ($this->from === null) {
$tableName = $modelClass::tableName();
if ($this->select === null && !empty($this->join)) {
$this->select = ["$tableName.*"];
}
$this->from = [$tableName];
}
list ($sql, $params) = $db->getQueryBuilder()->build($this);
$this->select = $select;
$this->from = $from;
} else {
$sql = $this->sql;
$params = $this->params;
}
return $db->createCommand($sql, $params);
}
/**
* Joins with the specified relations.
*
* This method allows you to reuse existing relation definitions to perform JOIN queries.
* Based on the definition of the specified relation(s), the method will append one or multiple
* JOIN statements to the current query.
*
* If the `$eagerLoading` parameter is true, the method will also eager loading the specified relations,
* which is equivalent to calling [[with()]] using the specified relations.
*
* Note that because a JOIN query will be performed, you are responsible to disambiguate column names.
*
* This method differs from [[with()]] in that it will build up and execute a JOIN SQL statement
* for the primary table. And when `$eagerLoading` is true, it will call [[with()]] in addition with the specified relations.
*
* @param array $with the relations to be joined. Each array element represents a single relation.
* The array keys are relation names, and the array values are the corresponding anonymous functions that
* can be used to modify the relation queries on-the-fly. If a relation query does not need modification,
* you may use the relation name as the array value. Sub-relations can also be specified (see [[with()]]).
* For example,
*
* ```php
* // find all orders that contain books, and eager loading "books"
* Order::find()->joinWith('books', true, 'INNER JOIN')->all();
* // find all orders, eager loading "books", and sort the orders and books by the book names.
* Order::find()->joinWith([
* 'books' => function ($query) {
* $query->orderBy('tbl_item.name');
* }
* ])->all();
* ```
*
* @param boolean|array $eagerLoading whether to eager load the relations specified in `$with`.
* When this is a boolean, it applies to all relations specified in `$with`. Use an array
* to explicitly list which relations in `$with` need to be eagerly loaded.
* @param string|array $joinType the join type of the relations specified in `$with`.
* When this is a string, it applies to all relations specified in `$with`. Use an array
* in the format of `relationName => joinType` to specify different join types for different relations.
* @return static the query object itself
*/
public function joinWith($with, $eagerLoading = true, $joinType = 'LEFT JOIN')
{
$with = (array)$with;
$this->joinWithRelations(new $this->modelClass, $with, $joinType);
if (is_array($eagerLoading)) {
foreach ($with as $name => $callback) {
if (is_integer($name)) {
if (!in_array($callback, $eagerLoading, true)) {
unset($with[$name]);
}
} elseif (!in_array($name, $eagerLoading, true)) {
unset($with[$name]);
}
}
$this->with($with);
} elseif ($eagerLoading) {
$this->with($with);
}
return $this;
}
/**
* Inner joins with the specified relations.
* This is a shortcut method to [[joinWith()]] with the join type set as "INNER JOIN".
* Please refer to [[joinWith()]] for detailed usage of this method.
* @param array $with the relations to be joined with
* @param boolean|array $eagerLoading whether to eager loading the relations
* @return static the query object itself
* @see joinWith()
*/
public function innerJoinWith($with, $eagerLoading = true)
{
return $this->joinWith($with, $eagerLoading, 'INNER JOIN');
}
/**
* Modifies the current query by adding join fragments based on the given relations.
* @param ActiveRecord $model the primary model
* @param array $with the relations to be joined
* @param string|array $joinType the join type
*/
private function joinWithRelations($model, $with, $joinType)
{
$relations = [];
foreach ($with as $name => $callback) {
if (is_integer($name)) {
$name = $callback;
$callback = null;
}
$primaryModel = $model;
$parent = $this;
$prefix = '';
while (($pos = strpos($name, '.')) !== false) {
$childName = substr($name, $pos + 1);
$name = substr($name, 0, $pos);
$fullName = $prefix === '' ? $name : "$prefix.$name";
if (!isset($relations[$fullName])) {
$relations[$fullName] = $relation = $primaryModel->getRelation($name);
$this->joinWithRelation($parent, $relation, $this->getJoinType($joinType, $fullName));
} else {
$relation = $relations[$fullName];
}
$primaryModel = new $relation->modelClass;
$parent = $relation;
$prefix = $fullName;
$name = $childName;
}
$fullName = $prefix === '' ? $name : "$prefix.$name";
if (!isset($relations[$fullName])) {
$relations[$fullName] = $relation = $primaryModel->getRelation($name);
if ($callback !== null) {
call_user_func($callback, $relation);
}
$this->joinWithRelation($parent, $relation, $this->getJoinType($joinType, $fullName));
}
}
}
/**
* Returns the join type based on the given join type parameter and the relation name.
* @param string|array $joinType the given join type(s)
* @param string $name relation name
* @return string the real join type
*/
private function getJoinType($joinType, $name)
{
if (is_array($joinType) && isset($joinType[$name])) {
return $joinType[$name];
} else {
return is_string($joinType) ? $joinType : 'INNER JOIN';
}
}
/**
* Returns the table name used by the specified active query.
* @param ActiveQuery $query
* @return string the table name
*/
private function getQueryTableName($query)
{
if (empty($query->from)) {
/** @var ActiveRecord $modelClass */
$modelClass = $query->modelClass;
return $modelClass::tableName();
} else {
return reset($query->from);
}
}
/**
* Joins a parent query with a child query.
* The current query object will be modified accordingly.
* @param ActiveQuery $parent
* @param ActiveRelation $child
* @param string $joinType
*/
private function joinWithRelation($parent, $child, $joinType)
{
$via = $child->via;
$child->via = null;
if ($via instanceof ActiveRelation) {
// via table
$this->joinWithRelation($parent, $via, $joinType);
$this->joinWithRelation($via, $child, $joinType);
return;
} elseif (is_array($via)) {
// via relation
$this->joinWithRelation($parent, $via[1], $joinType);
$this->joinWithRelation($via[1], $child, $joinType);
return;
}
$parentTable = $this->getQueryTableName($parent);
$childTable = $this->getQueryTableName($child);
if (strpos($parentTable, '{{') === false) {
$parentTable = '{{' . $parentTable . '}}';
}
if (strpos($childTable, '{{') === false) {
$childTable = '{{' . $childTable . '}}';
}
if (!empty($child->link)) {
$on = [];
foreach ($child->link as $childColumn => $parentColumn) {
$on[] = "$parentTable.[[$parentColumn]] = $childTable.[[$childColumn]]";
}
$on = implode(' AND ', $on);
} else {
$on = '';
}
$this->join($joinType, $childTable, $on);
if (!empty($child->where)) {
$this->andWhere($child->where);
}
if (!empty($child->having)) {
$this->andHaving($child->having);
}
if (!empty($child->orderBy)) {
$this->addOrderBy($child->orderBy);
}
if (!empty($child->groupBy)) {
$this->addGroupBy($child->groupBy);
}
if (!empty($child->params)) {
$this->addParams($child->params);
}
if (!empty($child->join)) {
foreach ($child->join as $join) {
$this->join[] = $join;
}
}
if (!empty($child->union)) {
foreach ($child->union as $union) {
$this->union[] = $union;
}
}
}
}