MongoCommandCursor::__construct

(PECL mongo >=1.5.0)

MongoCommandCursor::__construct — Create a new command cursor

说明

public MongoCommandCursor::__construct ( MongoClient $connection , string $ns , array $command = array() )

Generally, you should not have to construct a MongoCommandCursor manually, as there are helper functions such as MongoCollection::aggregateCursor() and MongoCollection::parallelCollectionScan(); however, if the server introduces new commands that can return cursors, this constructor will be useful in the absence of specific helper methods. You may also consider using MongoCommandCursor::createFromDocument().

参数

connection: Database connection.
ns: Full name of the database and collection (e.g. "test.foo")
command: Database command.

返回值

Returns the new cursor.

范例

Example #1 MongoCommandCursor example


<?php
$m = new MongoClient;

// Define the aggregation pipeline
$pipeline = [
    [ '$group' => [
        '_id' => '$country_code',
        'timezones' => [ '$addToSet' => '$timezone' ]
    ] ],
    [ '$sort' => [ '_id' => 1 ] ],
];

// Construct a MongoCommandCursor object
$cursor = new MongoCommandCursor(
    $m, // MongoClient object
    'demo.cities', // namespace
    [
        'aggregate' => 'cities',
        'pipeline' => $pipeline,
        'cursor' => [ 'batchSize' => 0 ],
    ]
);

foreach($cursor as $result) {
   …
}
?>

参见

MongoCommandCursor::createFromDocument() - Create a new command cursor from an existing command response document
MongoCollection::aggregateCursor() - Execute an aggregation pipeline command and retrieve results through a cursor
MongoCollection::parallelCollectionScan() - Returns an array of cursors to iterator over a full collection in parallel

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官方地址：https://www.php.net/manual/en/mongocommandcursor.construct.php

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MongoCommandCursor::__construct

说明

参数

返回值

范例

参见

User Contributed Notes