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MongoCursor::addOption

(PECL mongo >=1.0.4)

MongoCursor::addOption — Adds 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:

$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:

// 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 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().


// 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));


Описание класса mongocursor, примеры использования класса mongocursor.



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