PHP: MongoDB\Driver\Command::__construct

Descrizione

final public MongoDB\Driver\Command::__construct(array|object $document, ?array $commandOptions = null)

Constructs a new MongoDB\Driver\Command, which is an immutable value object that represents a database command. The command may then be executed with MongoDB\Driver\Manager::executeCommand().

The complete command document, which includes the command name and its options, should be expressed in the document parameter. The commandOptions parameter is only used to specify options related to the execution of the command and the resulting MongoDB\Driver\Cursor.

Elenco dei parametri

document

The complete command document, which will be sent to the server.

commandOptions

Nota: Do not use this parameter to specify options described in the command's reference in the MongoDB manual. This parameter should only be used for the options explicitly listed below.

**commandOptions**
Option	Type	Description
maxAwaitTimeMS	int	Positive integer denoting the time limit in milliseconds for the server to block a getMore operation if no data is available. This option should only be used in conjunction with commands that return a tailable cursor (e.g. » Change Streams).

Errori/Eccezioni

Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

Log delle modifiche

Versione	Descrizione
PECL mongodb 1.4.0	Added a second `commandOptions` argument, which supports the `"maxAwaitTimeMS"` option.

Esempi

Example #1 MongoDB\Driver\Command::__construct() example

<?php

$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017");
$command = new MongoDB\Driver\Command(array("buildinfo" => 1));

try {
    $cursor = $manager->executeCommand("admin", $command);
    $response = $cursor->toArray()[0];
} catch(MongoDB\Driver\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}
var_dump($response);

?>

Il precedente esempio visualizzerà qualcosa simile a:


array(13) {
  ["version"]=>
  string(14) "2.8.0-rc2-pre-"
  ["gitVersion"]=>
  string(62) "b743d7158f7642f4da6b7eac8320374b3b88dc2e modules: subscription"
  ["OpenSSLVersion"]=>
  string(25) "OpenSSL 1.0.1f 6 Jan 2014"
  ["sysInfo"]=>
  string(104) "Linux infant 3.16.0-24-generic #32-Ubuntu SMP Tue Oct 28 13:07:32 UTC 2014 x86_64 BOOST_LIB_VERSION=1_49"
  ["loaderFlags"]=>
  string(91) "-fPIC -pthread -Wl,-z,now -rdynamic -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,-E"
  ["compilerFlags"]=>
  string(301) "-Wnon-virtual-dtor -Woverloaded-virtual -std=c++11 -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -pipe -Werror -O3 -Wno-unused-local-typedefs -Wno-unused-function -Wno-deprecated-declarations -Wno-unused-but-set-variable -fno-builtin-memcmp -std=c99"
  ["allocator"]=>
  string(8) "tcmalloc"
  ["versionArray"]=>
  array(4) {
    [0]=>
    int(2)
    [1]=>
    int(8)
    [2]=>
    int(0)
    [3]=>
    int(-8)
  }
  ["javascriptEngine"]=>
  string(2) "V8"
  ["bits"]=>
  int(64)
  ["debug"]=>
  bool(false)
  ["maxBsonObjectSize"]=>
  int(16777216)
  ["ok"]=>
  float(1)
}

Example #2 MongoDB\Driver\Command::__construct() example

Commands can accept options as well, as part of the normal structure that you create to send to the server. For example, the maxTimeMS option can be passed with most commands to restrict the amount of time a specific command can run for on the server.

<?php

$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017");
$command = new MongoDB\Driver\Command(
    array(
        "distinct" => "beer",
        "key" => "beer_name",
        "maxTimeMS" => 10,
    )
);

try {
    $cursor = $manager->executeCommand("beerdb", $command);
    $response = $cursor->toArray()[0];
} catch(MongoDB\Driver\Exception\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}
var_dump($response);

?>

Il precedente esempio visualizzerà qualcosa simile a:

operation exceeded time limit

Vedere anche:

MongoDB\Driver\Manager::executeCommand() - Execute a database command
MongoDB\Driver\Cursor