(mongodb >=0.2.0)
MongoDB\Driver\BulkWrite::count — Count expected roundtrips
Returns how many sub-bulkes have been created so far, where each sub-bulk will result in one client<->server roundtrip.
此函数没有参数。
Returns number of sub-bulkes.
Example #1 Ordered bulkes are sent sequentially, broken up into sub-bulkes by group of operation type
<?php
$bulk = new MongoDB\Driver\BulkWrite(true);
$bulk->insert($a);
$bulk->insert($b);
$bulk->update($c, $obj);
$bulk->update($d, $obj);
$bulk->delete($e);
$bulk->delete($f);
$bulk->update($g, $obj);
$bulk->delete($h);
var_dump(count($bulk));
?>
以上例程会输出：
int(5)
Example #2 Un-ordered bulkes may be sent in any order in parallel or serial
<?php
$bulk = new MongoDB\Driver\BulkWrite(true);
$bulk->insert($a);
$bulk->insert($b);
$bulk->update($c, $obj);
$bulk->update($d, $obj);
$bulk->delete($e);
$bulk->delete($f);
$bulk->update($g, $obj);
$bulk->delete($h);
var_dump(count($bulk));
?>
以上例程的输出类似于：
int(3)