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695 lines
25 KiB
PHP
695 lines
25 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db;
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/**
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* ActiveQuery represents a DB query associated with an Active Record class.
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*
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* An ActiveQuery can be a normal query or be used in a relational context.
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*
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* ActiveQuery instances are usually created by [[ActiveRecord::find()]] and [[ActiveRecord::findBySql()]].
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* Relational queries are created by [[ActiveRecord::hasOne()]] and [[ActiveRecord::hasMany()]].
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*
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* Normal Query
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* ------------
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*
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* ActiveQuery mainly provides the following methods to retrieve the query results:
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*
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* - [[one()]]: returns a single record populated with the first row of data.
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* - [[all()]]: returns all records based on the query results.
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* - [[count()]]: returns the number of records.
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* - [[sum()]]: returns the sum over the specified column.
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* - [[average()]]: returns the average over the specified column.
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* - [[min()]]: returns the min over the specified column.
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* - [[max()]]: returns the max over the specified column.
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* - [[scalar()]]: returns the value of the first column in the first row of the query result.
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* - [[column()]]: returns the value of the first column in the query result.
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* - [[exists()]]: returns a value indicating whether the query result has data or not.
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*
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* Because ActiveQuery extends from [[Query]], one can use query methods, such as [[where()]],
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* [[orderBy()]] to customize the query options.
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*
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* ActiveQuery also provides the following additional query options:
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*
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* - [[with()]]: list of relations that this query should be performed with.
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* - [[indexBy()]]: the name of the column by which the query result should be indexed.
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* - [[asArray()]]: whether to return each record as an array.
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*
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* These options can be configured using methods of the same name. For example:
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*
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* ```php
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* $customers = Customer::find()->with('orders')->asArray()->all();
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* ```
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*
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* Relational query
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* ----------------
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*
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* In relational context ActiveQuery represents a relation between two Active Record classes.
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*
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* Relational ActiveQuery instances are usually created by calling [[ActiveRecord::hasOne()]] and
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* [[ActiveRecord::hasMany()]]. An Active Record class declares a relation by defining
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* a getter method which calls one of the above methods and returns the created ActiveQuery object.
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*
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* A relation is specified by [[link]] which represents the association between columns
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* of different tables; and the multiplicity of the relation is indicated by [[multiple]].
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*
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* If a relation involves a junction table, it may be specified by [[via()]] or [[viaTable()]] method.
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* These methods may only be called in a relational context. Same is true for [[inverseOf()]], which
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* marks a relation as inverse of another relation and [[onCondition()]] which adds a condition that
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* is to be added to relational query join condition.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @author Carsten Brandt <mail@cebe.cc>
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* @since 2.0
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*/
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class ActiveQuery extends Query implements ActiveQueryInterface
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{
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use ActiveQueryTrait;
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use ActiveRelationTrait;
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/**
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* @event Event an event that is triggered when the query is initialized via [[init()]].
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*/
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const EVENT_INIT = 'init';
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/**
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* @var string the SQL statement to be executed for retrieving AR records.
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* This is set by [[ActiveRecord::findBySql()]].
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*/
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public $sql;
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/**
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* @var string|array the join condition to be used when this query is used in a relational context.
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* The condition will be used in the ON part when [[ActiveQuery::joinWith()]] is called.
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* Otherwise, the condition will be used in the WHERE part of a query.
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* Please refer to [[Query::where()]] on how to specify this parameter.
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* @see onCondition()
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*/
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public $on;
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/**
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* @var array a list of relations that this query should be joined with
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*/
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public $joinWith;
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/**
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* Constructor.
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* @param string $modelClass the model class associated with this query
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* @param array $config configurations to be applied to the newly created query object
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*/
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public function __construct($modelClass, $config = [])
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{
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$this->modelClass = $modelClass;
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parent::__construct($config);
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}
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/**
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* Initializes the object.
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* This method is called at the end of the constructor. The default implementation will trigger
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* an [[EVENT_INIT]] event. If you override this method, make sure you call the parent implementation at the end
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* to ensure triggering of the event.
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*/
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public function init()
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{
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parent::init();
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$this->trigger(self::EVENT_INIT);
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}
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/**
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* Executes query and returns all results as an array.
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* @param Connection $db the DB connection used to create the DB command.
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* If null, the DB connection returned by [[modelClass]] will be used.
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* @return array|ActiveRecord[] the query results. If the query results in nothing, an empty array will be returned.
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*/
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public function all($db = null)
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{
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return parent::all($db);
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}
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/**
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* @inheritdoc
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*/
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public function prepare($builder)
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{
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// NOTE: because the same ActiveQuery may be used to build different SQL statements
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// (e.g. by ActiveDataProvider, one for count query, the other for row data query,
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// it is important to make sure the same ActiveQuery can be used to build SQL statements
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// multiple times.
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if (!empty($this->joinWith)) {
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$this->buildJoinWith();
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$this->joinWith = null; // clean it up to avoid issue https://github.com/yiisoft/yii2/issues/2687
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}
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if (empty($this->from)) {
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/* @var $modelClass ActiveRecord */
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$modelClass = $this->modelClass;
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$tableName = $modelClass::tableName();
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$this->from = [$tableName];
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}
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if (empty($this->select) && !empty($this->join)) {
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foreach ((array) $this->from as $alias => $table) {
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if (is_string($alias)) {
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$this->select = ["$alias.*"];
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} elseif (is_string($table)) {
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if (preg_match('/^(.*?)\s+({{\w+}}|\w+)$/', $table, $matches)) {
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$alias = $matches[2];
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} else {
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$alias = $table;
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}
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$this->select = ["$alias.*"];
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}
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break;
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}
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}
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if ($this->primaryModel === null) {
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// eager loading
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$query = Query::create($this);
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} else {
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// lazy loading of a relation
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$where = $this->where;
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if ($this->via instanceof self) {
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// via junction table
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$viaModels = $this->via->findJunctionRows([$this->primaryModel]);
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$this->filterByModels($viaModels);
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} elseif (is_array($this->via)) {
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// via relation
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/* @var $viaQuery ActiveQuery */
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list($viaName, $viaQuery) = $this->via;
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if ($viaQuery->multiple) {
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$viaModels = $viaQuery->all();
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$this->primaryModel->populateRelation($viaName, $viaModels);
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} else {
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$model = $viaQuery->one();
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$this->primaryModel->populateRelation($viaName, $model);
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$viaModels = $model === null ? [] : [$model];
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}
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$this->filterByModels($viaModels);
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} else {
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$this->filterByModels([$this->primaryModel]);
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}
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$query = Query::create($this);
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$this->where = $where;
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}
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if (!empty($this->on)) {
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$query->andWhere($this->on);
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}
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return $query;
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}
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/**
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* @inheritdoc
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*/
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public function populate($rows)
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{
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if (empty($rows)) {
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return [];
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}
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$models = $this->createModels($rows);
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if (!empty($this->join) && $this->indexBy === null) {
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$models = $this->removeDuplicatedModels($models);
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}
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if (!empty($this->with)) {
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$this->findWith($this->with, $models);
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}
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if (!$this->asArray) {
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foreach ($models as $model) {
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$model->afterFind();
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}
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}
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return $models;
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}
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/**
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* Removes duplicated models by checking their primary key values.
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* This method is mainly called when a join query is performed, which may cause duplicated rows being returned.
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* @param array $models the models to be checked
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* @return array the distinctive models
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*/
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private function removeDuplicatedModels($models)
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{
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$hash = [];
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/* @var $class ActiveRecord */
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$class = $this->modelClass;
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$pks = $class::primaryKey();
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if (count($pks) > 1) {
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foreach ($models as $i => $model) {
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$key = [];
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foreach ($pks as $pk) {
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$key[] = $model[$pk];
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}
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$key = serialize($key);
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if (isset($hash[$key])) {
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unset($models[$i]);
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} else {
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$hash[$key] = true;
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}
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}
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} else {
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$pk = reset($pks);
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foreach ($models as $i => $model) {
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$key = $model[$pk];
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if (isset($hash[$key])) {
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unset($models[$i]);
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} elseif ($key !== null) {
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$hash[$key] = true;
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}
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}
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}
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return array_values($models);
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}
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/**
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* Executes query and returns a single row of result.
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* @param Connection $db the DB connection used to create the DB command.
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* If null, the DB connection returned by [[modelClass]] will be used.
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* @return ActiveRecord|array|null a single row of query result. Depending on the setting of [[asArray]],
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* the query result may be either an array or an ActiveRecord object. Null will be returned
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* if the query results in nothing.
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*/
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public function one($db = null)
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{
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$row = parent::one($db);
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if ($row !== false) {
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$models = $this->populate([$row]);
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return reset($models) ?: null;
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} else {
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return null;
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}
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}
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/**
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* Creates a DB command that can be used to execute this query.
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* @param Connection $db the DB connection used to create the DB command.
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* If null, the DB connection returned by [[modelClass]] will be used.
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* @return Command the created DB command instance.
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*/
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public function createCommand($db = null)
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{
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/* @var $modelClass ActiveRecord */
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$modelClass = $this->modelClass;
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if ($db === null) {
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$db = $modelClass::getDb();
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}
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if ($this->sql === null) {
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list ($sql, $params) = $db->getQueryBuilder()->build($this);
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} else {
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$sql = $this->sql;
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$params = $this->params;
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}
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return $db->createCommand($sql, $params);
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}
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/**
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* Joins with the specified relations.
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*
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* This method allows you to reuse existing relation definitions to perform JOIN queries.
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* Based on the definition of the specified relation(s), the method will append one or multiple
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* JOIN statements to the current query.
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*
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* If the `$eagerLoading` parameter is true, the method will also eager loading the specified relations,
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* which is equivalent to calling [[with()]] using the specified relations.
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*
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* Note that because a JOIN query will be performed, you are responsible to disambiguate column names.
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*
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* This method differs from [[with()]] in that it will build up and execute a JOIN SQL statement
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* for the primary table. And when `$eagerLoading` is true, it will call [[with()]] in addition with the specified relations.
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*
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* @param string|array $with the relations to be joined. Each array element represents a single relation.
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* The array keys are relation names, and the array values are the corresponding anonymous functions that
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* can be used to modify the relation queries on-the-fly. If a relation query does not need modification,
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* you may use the relation name as the array value. Sub-relations can also be specified (see [[with()]]).
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* For example,
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*
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* ```php
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* // find all orders that contain books, and eager loading "books"
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* Order::find()->joinWith('books', true, 'INNER JOIN')->all();
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* // find all orders, eager loading "books", and sort the orders and books by the book names.
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* Order::find()->joinWith([
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* 'books' => function ($query) {
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* $query->orderBy('item.name');
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* }
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* ])->all();
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* ```
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*
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* @param boolean|array $eagerLoading whether to eager load the relations specified in `$with`.
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* When this is a boolean, it applies to all relations specified in `$with`. Use an array
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* to explicitly list which relations in `$with` need to be eagerly loaded.
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* @param string|array $joinType the join type of the relations specified in `$with`.
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* When this is a string, it applies to all relations specified in `$with`. Use an array
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* in the format of `relationName => joinType` to specify different join types for different relations.
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* @return static the query object itself
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*/
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public function joinWith($with, $eagerLoading = true, $joinType = 'LEFT JOIN')
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{
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$this->joinWith[] = [(array) $with, $eagerLoading, $joinType];
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return $this;
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}
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private function buildJoinWith()
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{
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$join = $this->join;
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$this->join = [];
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foreach ($this->joinWith as $config) {
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list ($with, $eagerLoading, $joinType) = $config;
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$this->joinWithRelations(new $this->modelClass, $with, $joinType);
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if (is_array($eagerLoading)) {
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foreach ($with as $name => $callback) {
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if (is_integer($name)) {
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if (!in_array($callback, $eagerLoading, true)) {
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unset($with[$name]);
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}
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} elseif (!in_array($name, $eagerLoading, true)) {
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unset($with[$name]);
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}
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}
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} elseif (!$eagerLoading) {
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$with = [];
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}
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$this->with($with);
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}
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// remove duplicated joins added by joinWithRelations that may be added
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// e.g. when joining a relation and a via relation at the same time
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$uniqueJoins = [];
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foreach ($this->join as $j) {
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$uniqueJoins[serialize($j)] = $j;
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}
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$this->join = array_values($uniqueJoins);
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if (!empty($join)) {
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// append explicit join to joinWith()
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// https://github.com/yiisoft/yii2/issues/2880
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$this->join = empty($this->join) ? $join : array_merge($this->join, $join);
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}
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}
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/**
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* Inner joins with the specified relations.
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* This is a shortcut method to [[joinWith()]] with the join type set as "INNER JOIN".
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* Please refer to [[joinWith()]] for detailed usage of this method.
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* @param string|array $with the relations to be joined with
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* @param boolean|array $eagerLoading whether to eager loading the relations
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* @return static the query object itself
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* @see joinWith()
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*/
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public function innerJoinWith($with, $eagerLoading = true)
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{
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return $this->joinWith($with, $eagerLoading, 'INNER JOIN');
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}
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/**
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* Modifies the current query by adding join fragments based on the given relations.
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* @param ActiveRecord $model the primary model
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* @param array $with the relations to be joined
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* @param string|array $joinType the join type
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*/
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private function joinWithRelations($model, $with, $joinType)
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{
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$relations = [];
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foreach ($with as $name => $callback) {
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if (is_integer($name)) {
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$name = $callback;
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$callback = null;
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}
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$primaryModel = $model;
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$parent = $this;
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$prefix = '';
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while (($pos = strpos($name, '.')) !== false) {
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$childName = substr($name, $pos + 1);
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$name = substr($name, 0, $pos);
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$fullName = $prefix === '' ? $name : "$prefix.$name";
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if (!isset($relations[$fullName])) {
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$relations[$fullName] = $relation = $primaryModel->getRelation($name);
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$this->joinWithRelation($parent, $relation, $this->getJoinType($joinType, $fullName));
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} else {
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$relation = $relations[$fullName];
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}
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$primaryModel = new $relation->modelClass;
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$parent = $relation;
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$prefix = $fullName;
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$name = $childName;
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}
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$fullName = $prefix === '' ? $name : "$prefix.$name";
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if (!isset($relations[$fullName])) {
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$relations[$fullName] = $relation = $primaryModel->getRelation($name);
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if ($callback !== null) {
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call_user_func($callback, $relation);
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}
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if (!empty($relation->joinWith)) {
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$relation->buildJoinWith();
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}
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$this->joinWithRelation($parent, $relation, $this->getJoinType($joinType, $fullName));
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}
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}
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}
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/**
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* Returns the join type based on the given join type parameter and the relation name.
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* @param string|array $joinType the given join type(s)
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* @param string $name relation name
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* @return string the real join type
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*/
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private function getJoinType($joinType, $name)
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{
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if (is_array($joinType) && isset($joinType[$name])) {
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return $joinType[$name];
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} else {
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return is_string($joinType) ? $joinType : 'INNER JOIN';
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}
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}
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/**
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* Returns the table name and the table alias for [[modelClass]].
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* @param ActiveQuery $query
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* @return array the table name and the table alias.
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*/
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private function getQueryTableName($query)
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{
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if (empty($query->from)) {
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/* @var $modelClass ActiveRecord */
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$modelClass = $query->modelClass;
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$tableName = $modelClass::tableName();
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} else {
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$tableName = '';
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foreach ($query->from as $alias => $tableName) {
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if (is_string($alias)) {
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return [$tableName, $alias];
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} else {
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break;
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}
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}
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}
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if (preg_match('/^(.*?)\s+({{\w+}}|\w+)$/', $tableName, $matches)) {
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$alias = $matches[2];
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} else {
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$alias = $tableName;
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}
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return [$tableName, $alias];
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}
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/**
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* Joins a parent query with a child query.
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* The current query object will be modified accordingly.
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* @param ActiveQuery $parent
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* @param ActiveQuery $child
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* @param string $joinType
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*/
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private function joinWithRelation($parent, $child, $joinType)
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{
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$via = $child->via;
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$child->via = null;
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if ($via instanceof ActiveQuery) {
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// via table
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$this->joinWithRelation($parent, $via, $joinType);
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$this->joinWithRelation($via, $child, $joinType);
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return;
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} elseif (is_array($via)) {
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// via relation
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$this->joinWithRelation($parent, $via[1], $joinType);
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$this->joinWithRelation($via[1], $child, $joinType);
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return;
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}
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list ($parentTable, $parentAlias) = $this->getQueryTableName($parent);
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list ($childTable, $childAlias) = $this->getQueryTableName($child);
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if (!empty($child->link)) {
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if (strpos($parentAlias, '{{') === false) {
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$parentAlias = '{{' . $parentAlias . '}}';
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}
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if (strpos($childAlias, '{{') === false) {
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$childAlias = '{{' . $childAlias . '}}';
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}
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$on = [];
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foreach ($child->link as $childColumn => $parentColumn) {
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$on[] = "$parentAlias.[[$parentColumn]] = $childAlias.[[$childColumn]]";
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}
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$on = implode(' AND ', $on);
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if (!empty($child->on)) {
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$on = ['and', $on, $child->on];
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}
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} else {
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$on = $child->on;
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}
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$this->join($joinType, empty($child->from) ? $childTable : $child->from, $on);
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if (!empty($child->where)) {
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$this->andWhere($child->where);
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}
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if (!empty($child->having)) {
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$this->andHaving($child->having);
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}
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if (!empty($child->orderBy)) {
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$this->addOrderBy($child->orderBy);
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}
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if (!empty($child->groupBy)) {
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$this->addGroupBy($child->groupBy);
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}
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if (!empty($child->params)) {
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$this->addParams($child->params);
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}
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if (!empty($child->join)) {
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foreach ($child->join as $join) {
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$this->join[] = $join;
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}
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}
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if (!empty($child->union)) {
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foreach ($child->union as $union) {
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$this->union[] = $union;
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}
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}
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}
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/**
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* Sets the ON condition for a relational query.
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* The condition will be used in the ON part when [[ActiveQuery::joinWith()]] is called.
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* Otherwise, the condition will be used in the WHERE part of a query.
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*
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* Use this method to specify additional conditions when declaring a relation in the [[ActiveRecord]] class:
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*
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* ```php
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* public function getActiveUsers()
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* {
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* return $this->hasMany(User::className(), ['id' => 'user_id'])->onCondition(['active' => true]);
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* }
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* ```
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*
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* @param string|array $condition the ON condition. Please refer to [[Query::where()]] on how to specify this parameter.
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* @param array $params the parameters (name => value) to be bound to the query.
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* @return static the query object itself
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*/
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public function onCondition($condition, $params = [])
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{
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$this->on = $condition;
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$this->addParams($params);
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return $this;
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}
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/**
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* Adds an additional ON condition to the existing one.
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* The new condition and the existing one will be joined using the 'AND' operator.
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* @param string|array $condition the new ON condition. Please refer to [[where()]]
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* on how to specify this parameter.
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* @param array $params the parameters (name => value) to be bound to the query.
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* @return static the query object itself
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* @see onCondition()
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* @see orOnCondition()
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*/
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public function andOnCondition($condition, $params = [])
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{
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if ($this->on === null) {
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$this->on = $condition;
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} else {
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$this->on = ['and', $this->on, $condition];
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}
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$this->addParams($params);
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return $this;
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}
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/**
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* Adds an additional ON condition to the existing one.
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* The new condition and the existing one will be joined using the 'OR' operator.
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* @param string|array $condition the new ON condition. Please refer to [[where()]]
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* on how to specify this parameter.
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* @param array $params the parameters (name => value) to be bound to the query.
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* @return static the query object itself
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* @see onCondition()
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* @see andOnCondition()
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*/
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public function orOnCondition($condition, $params = [])
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{
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if ($this->on === null) {
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$this->on = $condition;
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} else {
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$this->on = ['or', $this->on, $condition];
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}
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$this->addParams($params);
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return $this;
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}
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/**
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* Specifies the junction table for a relational query.
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*
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* Use this method to specify a junction table when declaring a relation in the [[ActiveRecord]] class:
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*
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* ```php
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* public function getItems()
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* {
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* return $this->hasMany(Item::className(), ['id' => 'item_id'])
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* ->viaTable('order_item', ['order_id' => 'id']);
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* }
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* ```
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*
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* @param string $tableName the name of the junction table.
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* @param array $link the link between the junction table and the table associated with [[primaryModel]].
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* The keys of the array represent the columns in the junction table, and the values represent the columns
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* in the [[primaryModel]] table.
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* @param callable $callable a PHP callback for customizing the relation associated with the junction table.
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* Its signature should be `function($query)`, where `$query` is the query to be customized.
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* @return static
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* @see via()
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*/
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public function viaTable($tableName, $link, callable $callable = null)
|
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{
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$relation = new ActiveQuery(get_class($this->primaryModel), [
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'from' => [$tableName],
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'link' => $link,
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'multiple' => true,
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'asArray' => true,
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]);
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$this->via = $relation;
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if ($callable !== null) {
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call_user_func($callable, $relation);
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}
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return $this;
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}
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}
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