# Class yii\redis\ActiveQuery

Inheritance | yii\redis\ActiveQuery » yii\base\Component » yii\base\BaseObject
Implements | yii\base\Configurable, yii\db\ActiveQueryInterface
Uses Traits | yii\db\ActiveQueryTrait, yii\db\ActiveRelationTrait, yii\db\QueryTrait
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2-redis/blob/master/ActiveQuery.php

ActiveQuery represents a query associated with an Active Record class.

An ActiveQuery can be a normal query or be used in a relational context.

ActiveQuery instances are usually created by yii\redis\ActiveRecord::find(). Relational queries are created by yii\redis\ActiveRecord::hasOne() and yii\redis\ActiveRecord::hasMany().

## Normal Query ¶

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.

You can use query methods, such as where(), limit() and 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();

## Relational query ¶

In relational context ActiveQuery represents a relation between two Active Record classes.

Relational ActiveQuery instances are usually created by calling yii\redis\ActiveRecord::hasOne() and yii\redis\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(). This methods may only be called in a relational context. Same is true for inverseOf(), which marks a relation as inverse of another relation.

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$asArray | boolean | Whether to return each record as an array. | yii\db\ActiveQueryTrait
$behaviors | yii\base\Behavior[] | List of behaviors attached to this component. This property is read-only. | yii\base\Component
$emulateExecution | boolean | Whether to emulate the actual query execution, returning empty or false results. | yii\db\QueryTrait
$indexBy | string|callable | The name of the column by which the query results should be indexed by. | yii\db\QueryTrait
$inverseOf | string | The name of the relation that is the inverse of this relation. | yii\db\ActiveRelationTrait
$limit | integer|yii\db\ExpressionInterface | Maximum number of records to be returned. | yii\db\QueryTrait
$link | array | The columns of the primary and foreign tables that establish a relation. | yii\db\ActiveRelationTrait
$modelClass | string | The name of the ActiveRecord class. | yii\db\ActiveQueryTrait
$multiple | boolean | Whether this query represents a relation to more than one record. | yii\db\ActiveRelationTrait
$offset | integer|yii\db\ExpressionInterface | Zero-based offset from where the records are to be returned. | yii\db\QueryTrait
$orderBy | array | How to sort the query results. | yii\db\QueryTrait
$primaryModel | yii\db\ActiveRecord | The primary model of a relational query. | yii\db\ActiveRelationTrait
$via | array|object | The query associated with the junction table. | yii\db\ActiveRelationTrait
$where | string|array|yii\db\ExpressionInterface | Query condition. | yii\db\QueryTrait
$with | array | A list of relations that this query should be performed with | yii\db\ActiveQueryTrait

## Public Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
() | ActiveRecordInterface[] all($db = null) | yii\db\ActiveRelationTrait
__call() | Calls the named method which is not a class method. | yii\base\Component
__clone() | Clones internal objects. | yii\db\ActiveRelationTrait
__construct() | Constructor. | yii\redis\ActiveQuery
__get() | Returns the value of a component property. | yii\base\Component
__isset() | Checks if a property is set, i.e. defined and not null. | yii\base\Component
__set() | Sets the value of a component property. | yii\base\Component
__unset() | Sets a component property to be null. | yii\base\Component
addOrderBy() | Adds additional ORDER BY columns to the query. | yii\db\QueryTrait
all() | Executes the query and returns all results as an array. | yii\redis\ActiveQuery
andFilterWhere() | Adds an additional WHERE condition to the existing one but ignores empty operands. | yii\db\QueryTrait
andWhere() | Adds an additional WHERE condition to the existing one. | yii\db\QueryTrait
asArray() | Sets the asArray() property. | yii\db\ActiveQueryTrait
attachBehavior() | Attaches a behavior to this component. | yii\base\Component
attachBehaviors() | Attaches a list of behaviors to the component. | yii\base\Component
average() | Returns the average of the specified column values. | yii\redis\ActiveQuery
behaviors() | Returns a list of behaviors that this component should behave as. | yii\base\Component
canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\Component
canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\Component
className() | Returns the fully qualified name of this class. | yii\base\BaseObject
column() | Executes the query and returns the first column of the result. | yii\redis\ActiveQuery
count() | Returns the number of records. | yii\redis\ActiveQuery
detachBehavior() | Detaches a behavior from the component. | yii\base\Component
detachBehaviors() | Detaches all behaviors from the component. | yii\base\Component
emulateExecution() | Sets whether to emulate query execution, preventing any interaction with data storage. | yii\db\QueryTrait
ensureBehaviors() | Makes sure that the behaviors declared in behaviors() are attached to this component. | yii\base\Component
exists() | Returns a value indicating whether the query result contains any row of data. | yii\redis\ActiveQuery
filterWhere() | Sets the WHERE part of the query but ignores empty operands. | yii\db\QueryTrait
findFor() | Finds the related records for the specified primary record. | yii\db\ActiveRelationTrait
findWith() | Finds records corresponding to one or multiple relations and populates them into the primary models. | yii\db\ActiveQueryTrait
getBehavior() | Returns the named behavior object. | yii\base\Component
getBehaviors() | Returns all behaviors attached to this component. | yii\base\Component
hasEventHandlers() | Returns a value indicating whether there is any handler attached to the named event. | yii\base\Component
hasMethod() | Returns a value indicating whether a method is defined. | yii\base\Component
hasProperty() | Returns a value indicating whether a property is defined for this component. | yii\base\Component
indexBy() | Sets the indexBy() property. | yii\db\QueryTrait
init() | Initializes the object. | yii\redis\ActiveQuery
inverseOf() | Sets the name of the relation that is the inverse of this relation. | yii\db\ActiveRelationTrait
limit() | Sets the LIMIT part of the query. | yii\db\QueryTrait
max() | Returns the maximum of the specified column values. | yii\redis\ActiveQuery
min() | Returns the minimum of the specified column values. | yii\redis\ActiveQuery
off() | Detaches an existing event handler from this component. | yii\base\Component
offset() | Sets the OFFSET part of the query. | yii\db\QueryTrait
on() | Attaches an event handler to an event. | yii\base\Component
one() | Executes the query and returns a single row of result. | yii\redis\ActiveQuery
orFilterWhere() | Adds an additional WHERE condition to the existing one but ignores empty operands. | yii\db\QueryTrait
orWhere() | Adds an additional WHERE condition to the existing one. | yii\db\QueryTrait
orderBy() | Sets the ORDER BY part of the query. | yii\db\QueryTrait
populateRelation() | Finds the related records and populates them into the primary models. | yii\db\ActiveRelationTrait
scalar() | Returns the query result as a scalar value. | yii\redis\ActiveQuery
sum() | Returns the number of records. | yii\redis\ActiveQuery
trigger() | Triggers an event. | yii\base\Component
via() | Specifies the relation associated with the junction table. | yii\db\ActiveRelationTrait
where() | Sets the WHERE part of the query. | yii\db\QueryTrait
with() | Specifies the relations with which this query should be performed. | yii\db\ActiveQueryTrait

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
createModels() | Converts found rows into model instances. | yii\db\ActiveQueryTrait
executeScript() | Executes a script created by yii\redis\LuaScriptBuilder | yii\redis\ActiveQuery
filterCondition() | Removes empty operands from the given query condition. | yii\db\QueryTrait
isEmpty() | Returns a value indicating whether the give value is "empty". | yii\db\QueryTrait
normalizeOrderBy() | Normalizes format of ORDER BY data. | yii\db\QueryTrait

## Events

Hide inherited events

Event | Type | Description | Defined By
--- | --- | --- | ---
EVENT_INIT | \yii\redis\Event | An event that is triggered when the query is initialized via init(). | yii\redis\ActiveQuery

## Method Details

__construct() public method

Constructor.

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

all() public method

Executes the query and returns all results as an array.

public array|yii\redis\ActiveRecord[] all ( $db = null )
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | array|yii\redis\ActiveRecord[] | The query results. If the query results in nothing, an empty array will be returned.

average() public method

Returns the average of the specified column values.

public integer average ( $column, $db = null )
$column | string | The column name or expression. Make sure you properly quote column names in the expression.
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | integer | The average of the specified column values.

column() public method

Executes the query and returns the first column of the result.

public array column ( $column, $db = null )
$column | string | Name of the column to select
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | array | The first column of the query result. An empty array is returned if the query results in nothing.

count() public method

Returns the number of records.

public integer count ( $q = '*', $db = null )
$q | string | The COUNT expression. This parameter is ignored by this implementation.
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | integer | Number of records

executeScript() protected method

Executes a script created by yii\redis\LuaScriptBuilder

protected array|boolean|null|string executeScript ( $db, $type, $columnName = null )
$db | yii\redis\Connection|null | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
$type | string | The type of the script to generate
$columnName | string |
throws | yii\base\NotSupportedException |

exists() public method

Returns a value indicating whether the query result contains any row of data.

public boolean exists ( $db = null )
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | boolean | Whether the query result contains any row of data.

init() public method

Initializes the object.

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 void init ( )

max() public method

Returns the maximum of the specified column values.

public integer max ( $column, $db = null )
$column | string | The column name or expression. Make sure you properly quote column names in the expression.
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | integer | The maximum of the specified column values.

min() public method

Returns the minimum of the specified column values.

public integer min ( $column, $db = null )
$column | string | The column name or expression. Make sure you properly quote column names in the expression.
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | integer | The minimum of the specified column values.

one() public method

Executes the query and returns a single row of result.

public yii\redis\ActiveRecord|array|null one ( $db = null )
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | yii\redis\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.

scalar() public method

Returns the query result as a scalar value.

The value returned will be the specified attribute in the first record of the query results.

public string scalar ( $attribute, $db = null )
$attribute | string | Name of the attribute to select
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | string | The value of the specified attribute in the first record of the query result. Null is returned if the query result is empty.

sum() public method

Returns the number of records.

public integer sum ( $column, $db = null )
$column | string | The column to sum up
$db | yii\redis\Connection | The database connection used to execute the query. If this parameter is not given, the `db` application component will be used.
return | integer | Number of records

## Event Details

EVENT_INIT event of type \yii\redis\Event

An event that is triggered when the query is initialized via init().