public static final class SpannerGrpc.SpannerBlockingStub extends AbstractBlockingStub<SpannerGrpc.SpannerBlockingStub>
A stub to allow clients to do synchronous rpc calls to service Spanner.
Cloud Spanner API
The Cloud Spanner API can be used to manage sessions and execute
transactions on data stored in Cloud Spanner databases.
Inheritance
java.lang.Object >
io.grpc.stub.AbstractStub >
io.grpc.stub.AbstractBlockingStub >
SpannerGrpc.SpannerBlockingStub
Inherited Members
io.grpc.stub.AbstractBlockingStub.<T>newStub(io.grpc.stub.AbstractStub.StubFactory<T>,io.grpc.Channel)
io.grpc.stub.AbstractBlockingStub.<T>newStub(io.grpc.stub.AbstractStub.StubFactory<T>,io.grpc.Channel,io.grpc.CallOptions)
io.grpc.stub.AbstractStub.<T>withOption(io.grpc.CallOptions.Key<T>,T)
io.grpc.stub.AbstractStub.build(io.grpc.Channel,io.grpc.CallOptions)
io.grpc.stub.AbstractStub.getCallOptions()
io.grpc.stub.AbstractStub.getChannel()
io.grpc.stub.AbstractStub.withCallCredentials(io.grpc.CallCredentials)
io.grpc.stub.AbstractStub.withChannel(io.grpc.Channel)
io.grpc.stub.AbstractStub.withCompression(java.lang.String)
io.grpc.stub.AbstractStub.withDeadline(io.grpc.Deadline)
io.grpc.stub.AbstractStub.withDeadlineAfter(long,java.util.concurrent.TimeUnit)
io.grpc.stub.AbstractStub.withExecutor(java.util.concurrent.Executor)
io.grpc.stub.AbstractStub.withInterceptors(io.grpc.ClientInterceptor...)
io.grpc.stub.AbstractStub.withMaxInboundMessageSize(int)
io.grpc.stub.AbstractStub.withMaxOutboundMessageSize(int)
io.grpc.stub.AbstractStub.withWaitForReady()
Methods
batchCreateSessions(BatchCreateSessionsRequest request)
public BatchCreateSessionsResponse batchCreateSessions(BatchCreateSessionsRequest request)
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.
batchWrite(BatchWriteRequest request)
public Iterator<BatchWriteResponse> batchWrite(BatchWriteRequest request)
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.
beginTransaction(BeginTransactionRequest request)
public Transaction beginTransaction(BeginTransactionRequest request)
Begins a new transaction. This step can often be skipped:
Read,
ExecuteSql and
Commit can begin a new transaction as a
side-effect.
build(Channel channel, CallOptions callOptions)
protected SpannerGrpc.SpannerBlockingStub build(Channel channel, CallOptions callOptions)
| Parameters |
|---|
| Name | Description |
channel | io.grpc.Channel
|
callOptions | io.grpc.CallOptions
|
Overrides
io.grpc.stub.AbstractStub.build(io.grpc.Channel,io.grpc.CallOptions)
commit(CommitRequest request)
public CommitResponse commit(CommitRequest request)
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.
createSession(CreateSessionRequest request)
public Session createSession(CreateSessionRequest request)
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".
deleteSession(DeleteSessionRequest request)
public Empty deleteSession(DeleteSessionRequest request)
Ends a session, releasing server resources associated with it. This will
asynchronously trigger cancellation of any operations that are running with
this session.
| Returns |
|---|
| Type | Description |
Empty | |
executeBatchDml(ExecuteBatchDmlRequest request)
public ExecuteBatchDmlResponse executeBatchDml(ExecuteBatchDmlRequest request)
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.
executeSql(ExecuteSqlRequest request)
public ResultSet executeSql(ExecuteSqlRequest request)
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.
executeStreamingSql(ExecuteSqlRequest request)
public Iterator<PartialResultSet> executeStreamingSql(ExecuteSqlRequest request)
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.
getSession(GetSessionRequest request)
public Session getSession(GetSessionRequest request)
Gets a session. Returns NOT_FOUND if the session does not exist.
This is mainly useful for determining whether a session is still
alive.
listSessions(ListSessionsRequest request)
public ListSessionsResponse listSessions(ListSessionsRequest request)
Lists all sessions in a given database.
partitionQuery(PartitionQueryRequest request)
public PartitionResponse partitionQuery(PartitionQueryRequest request)
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.
partitionRead(PartitionReadRequest request)
public PartitionResponse partitionRead(PartitionReadRequest request)
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.
read(ReadRequest request)
public ResultSet read(ReadRequest request)
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.
rollback(RollbackRequest request)
public Empty rollback(RollbackRequest request)
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.
| Returns |
|---|
| Type | Description |
Empty | |
streamingRead(ReadRequest request)
public Iterator<PartialResultSet> streamingRead(ReadRequest request)
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.
