Class ReadRequest (1.19.3)

The request for Read][google.spanner.v1.Spanner.Read] and StreamingRead][google.spanner.v1.Spanner.StreamingRead].

The transaction to use. If none is provided, the default is a temporary read-only transaction with strong concurrency.

If non-empty, the name of an index on table][google.spanner.v1.ReadRequest.table]. This index is used instead of the table primary key when interpreting [key_set][google.spanner.v1.ReadRequest.key_set] and sorting result rows. See [key_set][google.spanner.v1.ReadRequest.key_set] for further information.

Required. key_set identifies the rows to be yielded. key_set names the primary keys of the rows in table][google.spanner.v1.ReadRequest.table] to be yielded, unless index][google.spanner.v1.ReadRequest.index] is present. If index][google.spanner.v1.ReadRequest.index] is present, then [key_set][google.spanner.v1.ReadRequest.key_set] instead names index keys in index][google.spanner.v1.ReadRequest.index]. If the [partiti on_token][google.spanner.v1.ReadRequest.partition_token] field is empty, rows are yielded in table primary key order (if index][google.spanner.v1.ReadRequest.index] is empty) or index key order (if index][google.spanner.v1.ReadRequest.index] is non-empty). If the [partition_token][google.spanner.v1.ReadRequest.partition _token] field is not empty, rows will be yielded in an unspecified order. It is not an error for the key_set to name rows that do not exist in the database. Read yields nothing for nonexistent rows.

If this request is resuming a previously interrupted read, resume_token should be copied from the last PartialResultSet][google.spanner.v1.PartialResultSet] yielded before the interruption. Doing this enables the new read to resume where the last read left off. The rest of the request parameters must exactly match the request that yielded this token.