MongoDB\Driver\Cursor::isDead
(mongodb >=1.0.0)
MongoDB\Driver\Cursor::isDead — Checks if the cursor may have additional results
说明
final
public
MongoDB\Driver\Cursor::isDead (
void ) :
bool
Checks whether the cursor may have additional results available to read. A cursor is initially "alive" but may become "dead" for any of the following reasons:
- Advancing a non-tailable cursor did not return a document
- The cursor encountered an error
- The cursor read its last batch to completion
- The cursor reached its configured limit
参数
此函数没有参数。
返回值
Returns TRUE if additional results are not available, and FALSE otherwise.
错误／异常
- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
范例
Example #1 MongoDB\Driver\Cursor::isDead() example
<?php
$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017");
$query = new MongoDB\Driver\Query([]);
$bulk = new MongoDB\Driver\BulkWrite;
$bulk->insert(['x' => 1]);
$bulk->insert(['x' => 2]);
$bulk->insert(['x' => 3]);
$manager->executeBulkWrite('db.collection', $bulk);
$cursor = $manager->executeQuery('db.collection', $query);
$iterator = new IteratorIterator($cursor);
$iterator->rewind();
var_dump($cursor->isDead());
$iterator->next();
var_dump($cursor->isDead());
$iterator->next();
var_dump($cursor->isDead());
$iterator->next();
var_dump($cursor->isDead());
?>
以上例程会输出：
bool(false) bool(false) bool(false) bool(true)
