# MongoDB\Driver\Session::getServer

(mongodb >=1.6.0)

MongoDB\Driver\Session::getServer — Returns the server to which this session is pinned

### 说明

final public MongoDB\Driver\Session::getServer(): ?MongoDB\Driver\Server

Returns the MongoDB\Driver\Server to which this session is pinned. If the session is not pinned to a server, `null` will be returned.

Session pinning is primarily used for sharded transactions, as all commands within a sharded transaction must be sent to the same mongos instance. This method is intended to be used by libraries built atop the extension to allow use of a pinned server instead of invoking server selection.

### 参数

此函数没有参数。

### 返回值

Returns the MongoDB\Driver\Server to which this session is pinned, or `null` if the session is not pinned to any server.

### 错误／异常

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

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