# Class yii\mongodb\BatchQueryResult

Inheritance | yii\mongodb\BatchQueryResult » yii\base\BaseObject
Implements | Iterator, yii\base\Configurable
Available since version | 2.1
Source Code | https://github.com/yiisoft/yii2-mongodb/blob/master/BatchQueryResult.php

BatchQueryResult represents a batch query from which you can retrieve data in batches.

You usually do not instantiate BatchQueryResult directly. Instead, you obtain it by calling yii\mongodb\Query::batch() or yii\mongodb\Query::each(). Because BatchQueryResult implements the `Iterator` interface, you can iterate it to obtain a batch of data in each iteration. For example,

    $query = (new Query())->from('user');
    foreach ($query->batch() as $i => $users) {
        // $users represents the rows in the $i-th batch
    }
    foreach ($query->each() as $user) {
    }

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$batchSize | integer | The number of rows to be returned in each batch. | yii\mongodb\BatchQueryResult
$db | yii\mongodb\Connection | The MongoDB connection to be used when performing batch query. | yii\mongodb\BatchQueryResult
$each | boolean | Whether to return a single row during each iteration. | yii\mongodb\BatchQueryResult
$query | yii\mongodb\Query | The query object associated with this batch query. | yii\mongodb\BatchQueryResult

## Public Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
__call() | Calls the named method which is not a class method. | yii\base\BaseObject
__construct() | Constructor. | yii\base\BaseObject
__get() | Returns the value of an object property. | yii\base\BaseObject
__isset() | Checks if a property is set, i.e. defined and not null. | yii\base\BaseObject
__set() | Sets value of an object property. | yii\base\BaseObject
__unset() | Sets an object property to null. | yii\base\BaseObject
canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\BaseObject
canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\BaseObject
className() | Returns the fully qualified name of this class. | yii\base\BaseObject
current() | Returns the current dataset. | yii\mongodb\BatchQueryResult
hasMethod() | Returns a value indicating whether a method is defined. | yii\base\BaseObject
hasProperty() | Returns a value indicating whether a property is defined. | yii\base\BaseObject
init() | Initializes the object. | yii\base\BaseObject
key() | Returns the index of the current dataset. | yii\mongodb\BatchQueryResult
next() | Moves the internal pointer to the next dataset. | yii\mongodb\BatchQueryResult
reset() | Resets the batch query. | yii\mongodb\BatchQueryResult
rewind() | Resets the iterator to the initial state. | yii\mongodb\BatchQueryResult
valid() | Returns whether there is a valid dataset at the current position. | yii\mongodb\BatchQueryResult

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
fetchData() | Fetches the next batch of data. | yii\mongodb\BatchQueryResult

## Property Details

$batchSize public property

The number of rows to be returned in each batch.

public integer $batchSize = 100
$db public property

The MongoDB connection to be used when performing batch query. If null, the "mongodb" application component will be used.

public yii\mongodb\Connection $db = null
$each public property

Whether to return a single row during each iteration. If false, a whole batch of rows will be returned in each iteration.

public boolean $each = false
$query public property

The query object associated with this batch query. Do not modify this property directly unless after reset() is called explicitly.

public yii\mongodb\Query $query = null

## Method Details

current() public method

Returns the current dataset.

This method is required by the interface Iterator.

public mixed current ( )
return | mixed | The current dataset.

fetchData() protected method

Fetches the next batch of data.

protected array fetchData ( )
return | array | The data fetched

key() public method

Returns the index of the current dataset.

This method is required by the interface Iterator.

public integer key ( )
return | integer | The index of the current row.

next() public method

Moves the internal pointer to the next dataset.

This method is required by the interface Iterator.

public void next ( )

reset() public method

Resets the batch query.

This method will clean up the existing batch query so that a new batch query can be performed.

public void reset ( )

rewind() public method

Resets the iterator to the initial state.

This method is required by the interface Iterator.

public void rewind ( )

valid() public method

Returns whether there is a valid dataset at the current position.

This method is required by the interface Iterator.

public boolean valid ( )
return | boolean | Whether there is a valid dataset at the current position.