The MongoDB\Driver\Manager class

    (mongodb >=1.0.0)

    简介

    The MongoDB\Driver\Manager is the main entry point to the extension. It is responsible for maintaining connections to MongoDB (be it standalone server, replica set, or sharded cluster).

    No connection to MongoDB is made upon instantiating the Manager. This means the MongoDB\Driver\Manager can always be constructed, even though one or more MongoDB servers are down.

    Any write or query can throw connection exceptions as connections are created lazily. A MongoDB server may also become unavailable during the life time of the script. It is therefore important that all actions on the Manager to be wrapped in try/catch statements.

    类摘要

    final class MongoDB\Driver\Manager {
    /* 方法 */
    final public addSubscriber(MongoDB\Driver\Monitoring\Subscriber $subscriber): void
    final public __construct(?string $uri = null, ?array $uriOptions = null, ?array $driverOptions = null)
    final public createClientEncryption(array $options): MongoDB\Driver\ClientEncryption
    final public executeBulkWrite(string $namespace, MongoDB\Driver\BulkWrite $bulk, array|MongoDB\Driver\WriteConcern|null $options = null): MongoDB\Driver\WriteResult
    final public executeCommand(string $db, MongoDB\Driver\Command $command, array|MongoDB\Driver\ReadPreference|null $options = null): MongoDB\Driver\Cursor
    final public executeQuery(string $namespace, MongoDB\Driver\Query $query, array|MongoDB\Driver\ReadPreference|null $options = null): MongoDB\Driver\Cursor
    final public executeReadCommand(string $db, MongoDB\Driver\Command $command, ?array $options = null): MongoDB\Driver\Cursor
    final public executeReadWriteCommand(string $db, MongoDB\Driver\Command $command, ?array $options = null): MongoDB\Driver\Cursor
    final public executeWriteCommand(string $db, MongoDB\Driver\Command $command, ?array $options = null): MongoDB\Driver\Cursor
    final public getEncryptedFieldsMap(): array|object|null
    final public getReadConcern(): MongoDB\Driver\ReadConcern
    final public getReadPreference(): MongoDB\Driver\ReadPreference
    final public getServers(): array
    final public getWriteConcern(): MongoDB\Driver\WriteConcern
    final public removeSubscriber(MongoDB\Driver\Monitoring\Subscriber $subscriber): void
    final public selectServer(?MongoDB\Driver\ReadPreference $readPreference = null): MongoDB\Driver\Server
    final public startSession(?array $options = null): MongoDB\Driver\Session
    }

    示例

    示例 #1 MongoDB\Driver\Manager::__construct() basic example

    var_dump()ing a MongoDB\Driver\Manager will print out various details about the manager that are otherwise not normally exposed. This can be useful to debug how the driver views your MongoDB setup, and which options are used.

    <?php

    $manager     = new MongoDB\Driver\Manager('mongodb://localhost:27017');
    var_dump($manager);

    ?>

    以上示例的输出类似于：

    object(MongoDB\Driver\Manager)#1 (2) {
  ["uri"]=>
  string(26) "mongodb://127.0.0.1:27017/"
  ["cluster"]=>
  array(0) {
  }
}

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