3.7.0-rc 3.6.0 (latest) 3.5.0 3.4.0 3.3.0 3.2.0 2.48.0-rc 2.47.1 2.46.0 2.45.0 2.44.0 2.43.0 2.42.0 2.41.0 2.40.0 2.39.0 2.38.0 2.37.0 2.36.0 2.35.0 2.34.0 2.33.0 2.32.0 2.31.0 2.30.0 2.29.0 2.28.0 2.27.0 2.26.0 2.25.1 2.24.0 2.23.0 2.22.1 2.21.0 2.20.0 2.19.0 2.18.0 2.17.0 2.16.0 2.15.1 2.14.0 2.13.0 2.12.0 2.11.0 Defines the interface for [`RowStream`](https://docs.cloud.google.com/cpp/docs/reference/spanner/latest/classgoogle_1_1cloud_1_1spanner_1_1RowStream) implementations.
The [`RowStream`](https://docs.cloud.google.com/cpp/docs/reference/spanner/latest/classgoogle_1_1cloud_1_1spanner_1_1RowStream) class represents a stream of `Rows` returned from [`spanner::Client::Read()`](https://docs.cloud.google.com/cpp/docs/reference/spanner/latest/classgoogle_1_1cloud_1_1spanner_1_1Client#classgoogle_1_1cloud_1_1spanner_1_1Client_1a167955c44cd3ccb46ffe07cad6e7e52b) or [`spanner::Client::ExecuteQuery()`](https://docs.cloud.google.com/cpp/docs/reference/spanner/latest/classgoogle_1_1cloud_1_1spanner_1_1Client#classgoogle_1_1cloud_1_1spanner_1_1Client_1a8e2afee42f535c0436d9161c54b84179). There are different implementations depending the the RPC. Applications can also mock this class when testing their code and mocking the [`spanner::Client`](https://docs.cloud.google.com/cpp/docs/reference/spanner/latest/classgoogle_1_1cloud_1_1spanner_1_1Client) behavior.

## Functions

### NextRow()

Returns the next row in the stream.

| **Returns** ||
|---|---|
| **Type** | **Description** |
| `StatusOr< spanner::Row >` | if the stream is interrupted due to a failure the [`StatusOr`](https://docs.cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1StatusOr.html)`<`[`spanner::Row`](https://docs.cloud.google.com/cpp/docs/reference/spanner/latest/classgoogle_1_1cloud_1_1spanner_1_1Row)`>` contains the error. The function returns a successful [`StatusOr`](https://docs.cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1StatusOr.html)`<>` with an empty [`spanner::Row`](https://docs.cloud.google.com/cpp/docs/reference/spanner/latest/classgoogle_1_1cloud_1_1spanner_1_1Row) to indicate end-of-stream. |

### Metadata()

Returns metadata about the result set, such as the field types and the transaction id created by the request.

###### See Also

<https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#resultsetmetadata> for more information.

| **Returns** ||
|---|---|
| **Type** | **Description** |
| `std::optional< google::spanner::v1::ResultSetMetadata >` |   |

### Stats() const

Returns statistics about the result set, such as the number of rows, and the query plan used to compute the results.

###### See Also

<https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#resultsetstats> for more information.

| **Returns** ||
|---|---|
| **Type** | **Description** |
| `std::optional< google::spanner::v1::ResultSetStats >` |   |