PHP Class yii\db\ActiveQuery

An ActiveQuery can be a normal query or be used in a relational context. ActiveQuery instances are usually created by [[ActiveRecord::find()]] and [[ActiveRecord::findBySql()]]. Relational queries are created by [[ActiveRecord::hasOne()]] and [[ActiveRecord::hasMany()]]. Normal Query ------------ ActiveQuery mainly provides the following methods to retrieve the query results: - ActiveQuery::one: returns a single record populated with the first row of data. - ActiveQuery::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. - ActiveQuery::joinWith: reuse a relation query definition to add a join to a query. - [[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: php $customers = Customer::find()->with('orders')->asArray()->all(); Relational query ---------------- In relational context ActiveQuery represents a relation between two Active Record classes. Relational ActiveQuery instances are usually created by calling [[ActiveRecord::hasOne()]] and [[ActiveRecord::hasMany()]]. An Active Record class declares a relation by defining a getter method which calls one of the above methods and returns the created ActiveQuery object. A relation is specified by [[link]] which represents the association between columns of different tables; and the multiplicity of the relation is indicated by [[multiple]]. If a relation involves a junction table, it may be specified by [[via()]] or ActiveQuery::viaTable method. These methods may only be called in a relational context. Same is true for [[inverseOf()]], which marks a relation as inverse of another relation and ActiveQuery::onCondition which adds a condition that is to be added to relational query join condition.

Since: 2.0

Author: Qiang Xue ([email protected])

Author: Carsten Brandt ([email protected])

Inheritance: extends Query, implements yii\db\ActiveQueryInterface, use trait ActiveQueryTrait, use trait ActiveRelationTrait

显示文件 Open project: yiisoft/yii2 Class Usage Examples

Public Properties

Property	Type	Description
$joinWith		a list of relations that this query should be joined with
$on		the join condition to be used when this query is used in a relational context. The condition will be used in the ON part when [[ActiveQuery::joinWith()]] is called. Otherwise, the condition will be used in the WHERE part of a query. Please refer to [[Query::where()]] on how to specify this parameter.
$sql		the SQL statement to be executed for retrieving AR records. This is set by [[ActiveRecord::findBySql()]].

Public Methods

Method	Description
__construct ( string $modelClass, array $config = [] )	Constructor.
alias ( string $alias )	Define an alias for the table defined in [[modelClass]].
all ( Connection $db = null ) : array \| ActiveRecord[]	Executes query and returns all results as an array.
andOnCondition ( string \| array $condition, array $params = [] )	Adds an additional ON condition to the existing one.
createCommand ( Connection \| null $db = null ) : Command	Creates a DB command that can be used to execute this query.
init ( )	Initializes the object.
innerJoinWith ( string \| array $with, boolean \| array $eagerLoading = true )	Inner joins with the specified relations.
joinWith ( string \| array $with, boolean \| array $eagerLoading = true, string \| array $joinType = 'LEFT JOIN' )	Joins with the specified relations.
onCondition ( string \| array $condition, array $params = [] )	Sets the ON condition for a relational query.
one ( Connection \| null $db = null ) : ActiveRecord \| array \| null	Executes query and returns a single row of result.
orOnCondition ( string \| array $condition, array $params = [] )	Adds an additional ON condition to the existing one.
populate ( $rows )
prepare ( $builder )
viaTable ( string $tableName, array $link, callable $callable = null )	Specifies the junction table for a relational query.

Protected Methods

Method	Description
queryScalar ( $selectExpression, $db )

Private Methods

Method	Description
buildJoinWith ( )
getJoinType ( string \| array $joinType, string $name ) : string	Returns the join type based on the given join type parameter and the relation name.
getQueryTableName ( ActiveQuery $query ) : array	Returns the table name and the table alias for [[modelClass]].
joinWithRelation ( ActiveQuery $parent, ActiveQuery $child, string $joinType )	Joins a parent query with a child query.
joinWithRelations ( ActiveRecord $model, array $with, string \| array $joinType )	Modifies the current query by adding join fragments based on the given relations.
removeDuplicatedModels ( array $models ) : array	Removes duplicated models by checking their primary key values.

Method Details

__construct() public method

Constructor.

public __construct ( string $modelClass, array $config = [] )
$modelClass	string	the model class associated with this query
$config	array	configurations to be applied to the newly created query object

alias() public method

This method will adjust [[from]] so that an already defined alias will be overwritten. If none was defined, [[from]] will be populated with the given alias.

Since: 2.0.7

public alias ( string $alias )
$alias	string	the table alias.

all() public method

Executes query and returns all results as an array.

public all ( Connection $db = null ) : array \| ActiveRecord[]
$db	Connection	the DB connection used to create the DB command. If null, the DB connection returned by [[modelClass]] will be used.
return	array \| ActiveRecord[]	the query results. If the query results in nothing, an empty array will be returned.

andOnCondition() public method

The new condition and the existing one will be joined using the 'AND' operator.

createCommand() public method

Creates a DB command that can be used to execute this query.

public createCommand ( Connection \| null $db = null ) : Command
$db	Connection \| null	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.

init() public method

This method is called at the end of the constructor. The default implementation will trigger an [[EVENT_INIT]] event. If you override this method, make sure you call the parent implementation at the end to ensure triggering of the event.

public init ( )

innerJoinWith() public method

This is a shortcut method to ActiveQuery::joinWith with the join type set as "INNER JOIN". Please refer to ActiveQuery::joinWith for detailed usage of this method.

joinWith() public method

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 perform eager loading for 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.

public joinWith ( string \| array $with, boolean \| array $eagerLoading = true, string \| array $joinType = 'LEFT JOIN' )
$with	string \| array	the relations to be joined. This can either be a string, representing a relation name or an array with the following semantics: - Each array element represents a single relation. - You may specify the relation name as the array key and provide an anonymous functions that can be used to modify the relation queries on-the-fly as the array value. - If a relation query does not need modification, you may use the relation name as the array value. The relation name may optionally contain an alias for the relation table (e.g. `books b`). Sub-relations can also be specified, see [[with()]] for the syntax. In the following you find some examples: ```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 (\yii\db\ActiveQuery $query) { $query->orderBy('item.name'); } ])->all(); // find all orders that contain books of the category 'Science fiction', using the alias "b" for the books table Order::find()->joinWith(['books b'], true, 'INNER JOIN')->where(['b.category' => 'Science fiction'])->all(); ``` The alias syntax is available since version 2.0.7.
$eagerLoading	boolean \| array	whether to eager load the relations specified in `$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. Defaults to `true`.
$joinType	string \| array	the join type of the relations specified in `$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.

onCondition() public method

The condition will be used in the ON part when [[ActiveQuery::joinWith()]] is called. Otherwise, the condition will be used in the WHERE part of a query. Use this method to specify additional conditions when declaring a relation in the ActiveRecord class: php public function getActiveUsers() { return $this->hasMany(User::className(), ['id' => 'user_id']) ->onCondition(['active' => true]); } Note that this condition is applied in case of a join as well as when fetching the related records. Thus only fields of the related table can be used in the condition. Trying to access fields of the primary record will cause an error in a non-join-query.

public onCondition ( string \| array $condition, array $params = [] )
$condition	string \| array	the ON condition. Please refer to [[Query::where()]] on how to specify this parameter.
$params	array	the parameters (name => value) to be bound to the query.

one() public method

Executes query and returns a single row of result.

public one ( Connection \| null $db = null ) : ActiveRecord \| array \| null
$db	Connection \| null	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.

orOnCondition() public method

The new condition and the existing one will be joined using the 'OR' operator.

populate() public method

public populate ( $rows )

prepare() public method

public prepare ( $builder )

queryScalar() protected method

protected queryScalar ( $selectExpression, $db )

viaTable() public method

Use this method to specify a junction table when declaring a relation in the ActiveRecord class: php public function getItems() { return $this->hasMany(Item::className(), ['id' => 'item_id']) ->viaTable('order_item', ['order_id' => 'id']); }

Property Details

$joinWith public_oe property

a list of relations that this query should be joined with

public $joinWith

$on public_oe property

the join condition to be used when this query is used in a relational context. The condition will be used in the ON part when [[ActiveQuery::joinWith()]] is called. Otherwise, the condition will be used in the WHERE part of a query. Please refer to [[Query::where()]] on how to specify this parameter.

$sql public_oe property

the SQL statement to be executed for retrieving AR records. This is set by [[ActiveRecord::findBySql()]].

public $sql

public innerJoinWith ( string \| array $with, boolean \| array $eagerLoading = true )
$with	string \| array	the relations to be joined with.
$eagerLoading	boolean \| array	whether to eager loading the relations.

public andOnCondition ( string \| array $condition, array $params = [] )
$condition	string \| array	the new ON condition. Please refer to [[where()]] on how to specify this parameter.
$params	array	the parameters (name => value) to be bound to the query.

public orOnCondition ( string \| array $condition, array $params = [] )
$condition	string \| array	the new ON condition. Please refer to [[where()]] on how to specify this parameter.
$params	array	the parameters (name => value) to be bound to the query.

public viaTable ( string $tableName, array $link, callable $callable = null )
$tableName	string	the name of the junction table.
$link	array	the link between the junction table and the table associated with [[primaryModel]]. The keys of the array represent the columns in the junction table, and the values represent the columns in the [[primaryModel]] table.
$callable	callable	a PHP callback for customizing the relation associated with the junction table. Its signature should be `function($query)`, where `$query` is the query to be customized.