MongoCursor::addOption

(PECL mongo >=1.0.4)

MongoCursor::addOptionAdds a top-level key/value pair to a query

Описание

public MongoCursor MongoCursor::addOption ( string $key , mixed $value )

This is an advanced function and should not be used unless you know what you're doing.

A query can optionally be nested in a "query" field if other options, such as a sort or hint, are given. For instance, adding a sort causes the query to become a subfield of a bigger query object, like:

<?php

$query 
= array("query" => $query"orderby" => $sort);

?>

This method is for adding a top-level field to a query. It makes the query a subobject (if it isn't already) and adds the key/value pair of your chosing to the top level.

Внимание

It cannot be used to add extra criteria to a query on the fly. For instance, this will not work:

<?php

// NOT CORRECT
$cursor $users->find()->addOption("name""joe")->addOption("age"20);

?>
This does not query for a user named "joe" with an age of 20.

Список параметров

key

Fieldname to add.

value

Value to add.

Возвращаемые значения

Returns this cursor.

Ошибки

Throws MongoCursorException if this cursor has started iterating.

Примеры

Пример #1 Adding a comment with MongoCursor::addOption() example

MongoDB supports special options to be send to the server. The shell uses the _addSpecial option to send a $comment to the server. This comment will show up in the profiling log (for slow queries f.e.). In the PHP driver, you use the MongoCursor::addOption() method.

<?php
$m 
= new MongoClient;
$c $m->demo->demo;
$cursor $c->find();
$cursor->addOption('$comment'"This comment will show up in the profiling log");

foreach (
$cursor as $document) { /* empty */ }
?>

Результатом выполнения данного примера будет что-то подобное:

{
    "op" : "query",
    "ns" : "demo.demo",
    "query" : {
        "$query" : {

        },
        "$comment" : "This comment will show up in the profiling log"
    },
    "cursorid" : 168463566447,
    "ntoreturn" : 0,
    "ntoskip" : 0,
    "nscanned" : 101,
    "nscannedObjects" : 101,
    "keyUpdates" : 0,
    "numYield" : 0,
…

Пример #2 MongoCursor::addOption() example

Using MongoCursor::skip() to skip over millions of results can become slow. One way around this is to use $min or $max options for the query. These can be handy, but they require an index on exactly the fields being searched for. This is an example of how to use $min as an alternative to MongoCursor::skip().

<?php

// make sure we have an index
$c->ensureIndex(array("ts" => 1));

// you may have to modify this to run in a reasonable amount of time on slow 
// machines (should take about 30 seconds on a good machine)
for ($i 0$i 30000000$i++) {
    
$c->insert(array("ts" => new MongoDate(), "i" => $i));
}

$now strtotime("now");

// find documents inserted in the last 2 seconds
$cursor $c->find()->addOption('$min', array("ts" => $now-2));

?>

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