|
public batch ( integer $batchSize = 100, |
||
| $batchSize | integer | the number of records to be fetched in each batch. |
| $db | the database connection. If not set, the "db" application component will be used. | |
| 리턴 | the batch query result. It implements the [[\Iterator]] interface and can be traversed to retrieve the data in batches. | |
public function batch($batchSize = 100, $db = null)
{
return Yii::createObject(['class' => BatchQueryResult::className(), 'query' => $this, 'batchSize' => $batchSize, 'db' => $db, 'each' => false]);
} /**
* Perform a Database Query and show the result as CSV
*
* By default, write to the output buffer.
* But, if you set the filename, the file will be downloadable.
*
* @param string $filename Name of the file to download
*/
public function performAsCSV($filename = null)
{
// Create the CSV into memory
$csv = Writer::createFromFileObject(new SplTempFileObject());
// Insert fields names as the CSV header
$csv->insertOne($this->getCSVHeader());
// Print to the output stream
foreach ($this->query->batch() as $items) {
// $items is an array of 100 or fewer rows from the db table
$csv->insertAll($items);
}
$csv->output($filename);
}