batch() public method (available since version 2.1)
Starts a batch query.
A batch query supports fetching data in batches, which can keep the memory usage under a limit. This method will return a yii\mongodb\BatchQueryResult object which implements the Iterator interface and can be traversed to retrieve the data in batches.
For example,
$query = (new Query)->from('user');
foreach ($query->batch() as $rows) {
// $rows is an array of 10 or fewer rows from user collection
}
| public yii\mongodb\BatchQueryResult batch ( $batchSize = 100, $db = null ) | ||
|---|---|---|
| $batchSize | integer |
The number of records to be fetched in each batch. |
| $db | yii\mongodb\Connection |
The MongoDB connection. If not set, the "mongodb" application component will be used. |
| return | yii\mongodb\BatchQueryResult |
The batch query result. It implements the |
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