public static interface SpannerGrpc.AsyncServiceCloud Spanner API The Cloud Spanner API can be used to manage sessions and execute transactions on data stored in Cloud Spanner databases.
Methods
batchCreateSessions(BatchCreateSessionsRequest request, StreamObserver<BatchCreateSessionsResponse> responseObserver)
public default void batchCreateSessions(BatchCreateSessionsRequest request, StreamObserver<BatchCreateSessionsResponse> responseObserver)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 |
responseObserver | io.grpc.stub.StreamObserver<BatchCreateSessionsResponse> |
batchWrite(BatchWriteRequest request, StreamObserver<BatchWriteResponse> responseObserver)
public default void batchWrite(BatchWriteRequest request, StreamObserver<BatchWriteResponse> responseObserver)Batches the supplied mutation groups in a collection of efficient transactions. All mutations in a group are committed atomically. However, mutations across groups can be committed non-atomically in an unspecified order and thus, they must be independent of each other. Partial failure is possible, i.e., some groups may have been committed successfully, while some may have failed. The results of individual batches are streamed into the response as the batches are applied. BatchWrite requests are not replay protected, meaning that each mutation group may be applied more than once. Replays of non-idempotent mutations may have undesirable effects. For example, replays of an insert mutation may produce an already exists error or if you use generated or commit timestamp-based keys, it may result in additional rows being added to the mutation's table. We recommend structuring your mutation groups to be idempotent to avoid this issue.
| Parameters | |
|---|---|
| Name | Description |
request | BatchWriteRequest |
responseObserver | io.grpc.stub.StreamObserver<BatchWriteResponse> |
beginTransaction(BeginTransactionRequest request, StreamObserver<Transaction> responseObserver)
public default void beginTransaction(BeginTransactionRequest request, StreamObserver<Transaction> responseObserver)Begins a new transaction. This step can often be skipped: Read, ExecuteSql and Commit can begin a new transaction as a side-effect.
| Parameters | |
|---|---|
| Name | Description |
request | BeginTransactionRequest |
responseObserver | io.grpc.stub.StreamObserver<Transaction> |
commit(CommitRequest request, StreamObserver<CommitResponse> responseObserver)
public default void commit(CommitRequest request, StreamObserver<CommitResponse> responseObserver) 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 |
responseObserver | io.grpc.stub.StreamObserver<CommitResponse> |
createSession(CreateSessionRequest request, StreamObserver<Session> responseObserver)
public default void createSession(CreateSessionRequest request, StreamObserver<Session> responseObserver) 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 |
responseObserver | io.grpc.stub.StreamObserver<Session> |
deleteSession(DeleteSessionRequest request, StreamObserver<Empty> responseObserver)
public default void deleteSession(DeleteSessionRequest request, StreamObserver<Empty> responseObserver)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 |
responseObserver | io.grpc.stub.StreamObserver<Empty> |
executeBatchDml(ExecuteBatchDmlRequest request, StreamObserver<ExecuteBatchDmlResponse> responseObserver)
public default void executeBatchDml(ExecuteBatchDmlRequest request, StreamObserver<ExecuteBatchDmlResponse> responseObserver)Executes a batch of SQL DML statements. This method allows many statements to be run with lower latency than submitting them sequentially with ExecuteSql. Statements are executed in sequential order. A request can succeed even if a statement fails. The 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 |
responseObserver | io.grpc.stub.StreamObserver<ExecuteBatchDmlResponse> |
executeSql(ExecuteSqlRequest request, StreamObserver<ResultSet> responseObserver)
public default void executeSql(ExecuteSqlRequest request, StreamObserver<ResultSet> responseObserver) 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 for more details.
Larger result sets can be fetched in streaming fashion by calling
ExecuteStreamingSql instead.
| Parameters | |
|---|---|
| Name | Description |
request | ExecuteSqlRequest |
responseObserver | io.grpc.stub.StreamObserver<ResultSet> |
executeStreamingSql(ExecuteSqlRequest request, StreamObserver<PartialResultSet> responseObserver)
public default void executeStreamingSql(ExecuteSqlRequest request, StreamObserver<PartialResultSet> responseObserver)Like ExecuteSql, except returns the result set as a stream. Unlike 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 |
responseObserver | io.grpc.stub.StreamObserver<PartialResultSet> |
getSession(GetSessionRequest request, StreamObserver<Session> responseObserver)
public default void getSession(GetSessionRequest request, StreamObserver<Session> responseObserver) 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 |
responseObserver | io.grpc.stub.StreamObserver<Session> |
listSessions(ListSessionsRequest request, StreamObserver<ListSessionsResponse> responseObserver)
public default void listSessions(ListSessionsRequest request, StreamObserver<ListSessionsResponse> responseObserver)Lists all sessions in a given database.
| Parameters | |
|---|---|
| Name | Description |
request | ListSessionsRequest |
responseObserver | io.grpc.stub.StreamObserver<ListSessionsResponse> |
partitionQuery(PartitionQueryRequest request, StreamObserver<PartitionResponse> responseObserver)
public default void partitionQuery(PartitionQueryRequest request, StreamObserver<PartitionResponse> responseObserver)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 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 |
responseObserver | io.grpc.stub.StreamObserver<PartitionResponse> |
partitionRead(PartitionReadRequest request, StreamObserver<PartitionResponse> responseObserver)
public default void partitionRead(PartitionReadRequest request, StreamObserver<PartitionResponse> responseObserver)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 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 |
responseObserver | io.grpc.stub.StreamObserver<PartitionResponse> |
read(ReadRequest request, StreamObserver<ResultSet> responseObserver)
public default void read(ReadRequest request, StreamObserver<ResultSet> responseObserver) Reads rows from the database using key lookups and scans, as a
simple key/value style alternative to
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 for more details.
Larger result sets can be yielded in streaming fashion by calling
StreamingRead instead.
| Parameters | |
|---|---|
| Name | Description |
request | ReadRequest |
responseObserver | io.grpc.stub.StreamObserver<ResultSet> |
rollback(RollbackRequest request, StreamObserver<Empty> responseObserver)
public default void rollback(RollbackRequest request, StreamObserver<Empty> responseObserver) 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 or 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 |
responseObserver | io.grpc.stub.StreamObserver<Empty> |
streamingRead(ReadRequest request, StreamObserver<PartialResultSet> responseObserver)
public default void streamingRead(ReadRequest request, StreamObserver<PartialResultSet> responseObserver)Like Read, except returns the result set as a stream. Unlike 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 |
responseObserver | io.grpc.stub.StreamObserver<PartialResultSet> |