Returns the server connection ID for the command

# MongoDB\Driver\Monitoring\CommandStartedEvent::getServerConnectionId

(mongodb >=1.14.0)

MongoDB\Driver\Monitoring\CommandStartedEvent::getServerConnectionId — Returns the server connection ID for the command

### 説明

final public function MongoDB\Driver\Monitoring\CommandStartedEvent::getServerConnectionId(): ?int

Returns the server connection ID for the command. The server connection ID is distinct from server (i.e. MongoDB\Driver\Monitoring\CommandStartedEvent::getServer()) and is returned in the "connectionId" field of a `hello` command response MongoDB 4.2+.

### パラメータ

この関数にはパラメータはありません。

### 戻り値

Returns the server connection ID, or `null` if it is not available.

### エラー / 例外

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

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