Google Cloud Spanner v1 API - Class Spanner.SpannerBase (4.2.0)

[BindServiceMethod(typeof(Spanner), "BindService")]
public abstract class SpannerBase

Reference documentation and code samples for the Google Cloud Spanner v1 API class Spanner.SpannerBase.

Base class for server-side implementations of Spanner

Inheritance

Object > Spanner.SpannerBase

Inherited Members

Object.GetHashCode()

Object.GetType()

Object.MemberwiseClone()

Object.ToString()

Namespace

Google.Cloud.Spanner.V1

Assembly

Google.Cloud.Spanner.V1.dll

Methods

BatchCreateSessions(BatchCreateSessionsRequest, ServerCallContext)

public virtual Task<BatchCreateSessionsResponse> BatchCreateSessions(BatchCreateSessionsRequest request, ServerCallContext context)

Creates multiple new sessions.

This API can be used to initialize a session cache on the clients. See https://goo.gl/TgSFN2 for best practices on session cache management.

Parameters
Name	Description
`request`	`BatchCreateSessionsRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<BatchCreateSessionsResponse>`	The response to send back to the client (wrapped by a task).

BeginTransaction(BeginTransactionRequest, ServerCallContext)

public virtual Task<Transaction> BeginTransaction(BeginTransactionRequest request, ServerCallContext context)

Begins a new transaction. This step can often be skipped: [Read][google.spanner.v1.Spanner.Read], [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] and [Commit][google.spanner.v1.Spanner.Commit] can begin a new transaction as a side-effect.

Parameters
Name	Description
`request`	`BeginTransactionRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<Transaction>`	The response to send back to the client (wrapped by a task).

Commit(CommitRequest, ServerCallContext)

public virtual Task<CommitResponse> Commit(CommitRequest request, ServerCallContext context)

Commits a transaction. The request includes the mutations to be applied to rows in the database.

Commit might return an ABORTED error. This can occur at any time; commonly, the cause is conflicts with concurrent transactions. However, it can also happen for a variety of other reasons. If Commit returns ABORTED, the caller should re-attempt the transaction from the beginning, re-using the same session.

On very rare occasions, Commit might return UNKNOWN. This can happen, for example, if the client job experiences a 1+ hour networking failure. At that point, Cloud Spanner has lost track of the transaction outcome and we recommend that you perform another read from the database to see the state of things as they are now.

Parameters
Name	Description
`request`	`CommitRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<CommitResponse>`	The response to send back to the client (wrapped by a task).

CreateSession(CreateSessionRequest, ServerCallContext)

public virtual Task<Session> CreateSession(CreateSessionRequest request, ServerCallContext context)

Creates a new session. A session can be used to perform transactions that read and/or modify data in a Cloud Spanner database. Sessions are meant to be reused for many consecutive transactions.

Sessions can only execute one transaction at a time. To execute multiple concurrent read-write/write-only transactions, create multiple sessions. Note that standalone reads and queries use a transaction internally, and count toward the one transaction limit.

Active sessions use additional server resources, so it is a good idea to delete idle and unneeded sessions. Aside from explicit deletes, Cloud Spanner may delete sessions for which no operations are sent for more than an hour. If a session is deleted, requests to it return NOT_FOUND.

Idle sessions can be kept alive by sending a trivial SQL query periodically, e.g., "SELECT 1".

Parameters
Name	Description
`request`	`CreateSessionRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<Session>`	The response to send back to the client (wrapped by a task).

DeleteSession(DeleteSessionRequest, ServerCallContext)

public virtual Task<Empty> DeleteSession(DeleteSessionRequest request, ServerCallContext context)

Ends a session, releasing server resources associated with it. This will asynchronously trigger cancellation of any operations that are running with this session.

Parameters
Name	Description
`request`	`DeleteSessionRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<Empty>`	The response to send back to the client (wrapped by a task).

ExecuteBatchDml(ExecuteBatchDmlRequest, ServerCallContext)

public virtual Task<ExecuteBatchDmlResponse> ExecuteBatchDml(ExecuteBatchDmlRequest request, ServerCallContext context)

Executes a batch of SQL DML statements. This method allows many statements to be run with lower latency than submitting them sequentially with [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql].

Statements are executed in sequential order. A request can succeed even if a statement fails. The [ExecuteBatchDmlResponse.status][google.spanner.v1.ExecuteBatchDmlResponse.status] field in the response provides information about the statement that failed. Clients must inspect this field to determine whether an error occurred.

Execution stops after the first failed statement; the remaining statements are not executed.

Parameters
Name	Description
`request`	`ExecuteBatchDmlRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<ExecuteBatchDmlResponse>`	The response to send back to the client (wrapped by a task).

ExecuteSql(ExecuteSqlRequest, ServerCallContext)

public virtual Task<ResultSet> ExecuteSql(ExecuteSqlRequest request, ServerCallContext context)

Executes an SQL statement, returning all results in a single reply. This method cannot be used to return a result set larger than 10 MiB; if the query yields more data than that, the query fails with a FAILED_PRECONDITION error.

Operations inside read-write transactions might return ABORTED. If this occurs, the application should restart the transaction from the beginning. See [Transaction][google.spanner.v1.Transaction] for more details.

Larger result sets can be fetched in streaming fashion by calling [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql] instead.

Parameters
Name	Description
`request`	`ExecuteSqlRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<ResultSet>`	The response to send back to the client (wrapped by a task).

ExecuteStreamingSql(ExecuteSqlRequest, IServerStreamWriter<PartialResultSet>, ServerCallContext)

public virtual Task ExecuteStreamingSql(ExecuteSqlRequest request, IServerStreamWriter<PartialResultSet> responseStream, ServerCallContext context)

Like [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql], except returns the result set as a stream. Unlike [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql], there is no limit on the size of the returned result set. However, no individual row in the result set can exceed 100 MiB, and no column value can exceed 10 MiB.

Parameters
Name	Description
`request`	`ExecuteSqlRequest` The request received from the client.
`responseStream`	`IServerStreamWriter<PartialResultSet>` Used for sending responses back to the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task`	A task indicating completion of the handler.

GetSession(GetSessionRequest, ServerCallContext)

public virtual Task<Session> GetSession(GetSessionRequest request, ServerCallContext context)

Gets a session. Returns NOT_FOUND if the session does not exist. This is mainly useful for determining whether a session is still alive.

Parameters
Name	Description
`request`	`GetSessionRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<Session>`	The response to send back to the client (wrapped by a task).

ListSessions(ListSessionsRequest, ServerCallContext)

public virtual Task<ListSessionsResponse> ListSessions(ListSessionsRequest request, ServerCallContext context)

Lists all sessions in a given database.

Parameters
Name	Description
`request`	`ListSessionsRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<ListSessionsResponse>`	The response to send back to the client (wrapped by a task).

PartitionQuery(PartitionQueryRequest, ServerCallContext)

public virtual Task<PartitionResponse> PartitionQuery(PartitionQueryRequest request, ServerCallContext context)

Creates a set of partition tokens that can be used to execute a query operation in parallel. Each of the returned partition tokens can be used by [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql] to specify a subset of the query result to read. The same session and read-only transaction must be used by the PartitionQueryRequest used to create the partition tokens and the ExecuteSqlRequests that use the partition tokens.

Partition tokens become invalid when the session used to create them is deleted, is idle for too long, begins a new transaction, or becomes too old. When any of these happen, it is not possible to resume the query, and the whole operation must be restarted from the beginning.

Parameters
Name	Description
`request`	`PartitionQueryRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<PartitionResponse>`	The response to send back to the client (wrapped by a task).

PartitionRead(PartitionReadRequest, ServerCallContext)

public virtual Task<PartitionResponse> PartitionRead(PartitionReadRequest request, ServerCallContext context)

Creates a set of partition tokens that can be used to execute a read operation in parallel. Each of the returned partition tokens can be used by [StreamingRead][google.spanner.v1.Spanner.StreamingRead] to specify a subset of the read result to read. The same session and read-only transaction must be used by the PartitionReadRequest used to create the partition tokens and the ReadRequests that use the partition tokens. There are no ordering guarantees on rows returned among the returned partition tokens, or even within each individual StreamingRead call issued with a partition_token.

Partition tokens become invalid when the session used to create them is deleted, is idle for too long, begins a new transaction, or becomes too old. When any of these happen, it is not possible to resume the read, and the whole operation must be restarted from the beginning.

Parameters
Name	Description
`request`	`PartitionReadRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<PartitionResponse>`	The response to send back to the client (wrapped by a task).

Read(ReadRequest, ServerCallContext)

public virtual Task<ResultSet> Read(ReadRequest request, ServerCallContext context)

Reads rows from the database using key lookups and scans, as a simple key/value style alternative to [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql]. This method cannot be used to return a result set larger than 10 MiB; if the read matches more data than that, the read fails with a FAILED_PRECONDITION error.

Reads inside read-write transactions might return ABORTED. If this occurs, the application should restart the transaction from the beginning. See [Transaction][google.spanner.v1.Transaction] for more details.

Larger result sets can be yielded in streaming fashion by calling [StreamingRead][google.spanner.v1.Spanner.StreamingRead] instead.

Parameters
Name	Description
`request`	`ReadRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<ResultSet>`	The response to send back to the client (wrapped by a task).

Rollback(RollbackRequest, ServerCallContext)

public virtual Task<Empty> Rollback(RollbackRequest request, ServerCallContext context)

Rolls back a transaction, releasing any locks it holds. It is a good idea to call this for any transaction that includes one or more [Read][google.spanner.v1.Spanner.Read] or [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] requests and ultimately decides not to commit.

Rollback returns OK if it successfully aborts the transaction, the transaction was already aborted, or the transaction is not found. Rollback never returns ABORTED.

Parameters
Name	Description
`request`	`RollbackRequest` The request received from the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task<Empty>`	The response to send back to the client (wrapped by a task).

StreamingRead(ReadRequest, IServerStreamWriter<PartialResultSet>, ServerCallContext)

public virtual Task StreamingRead(ReadRequest request, IServerStreamWriter<PartialResultSet> responseStream, ServerCallContext context)

Like [Read][google.spanner.v1.Spanner.Read], except returns the result set as a stream. Unlike [Read][google.spanner.v1.Spanner.Read], there is no limit on the size of the returned result set. However, no individual row in the result set can exceed 100 MiB, and no column value can exceed 10 MiB.

Parameters
Name	Description
`request`	`ReadRequest` The request received from the client.
`responseStream`	`IServerStreamWriter<PartialResultSet>` Used for sending responses back to the client.
`context`	`ServerCallContext` The context of the server-side call handler being invoked.

Returns
Type	Description
`Task`	A task indicating completion of the handler.