transaction.pb.go

// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// 	protoc-gen-go v1.33.0
// 	protoc        v4.25.3
// source: google/spanner/v1/transaction.proto

package spannerpb

import (
	reflect "reflect"
	sync "sync"

	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
	durationpb "google.golang.org/protobuf/types/known/durationpb"
	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
)

const (
	// Verify that this generated code is sufficiently up-to-date.
	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
	// Verify that runtime/protoimpl is sufficiently up-to-date.
	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)

// `ReadLockMode` is used to set the read lock mode for read-write
// transactions.
type TransactionOptions_ReadWrite_ReadLockMode int32

const (
	// Default value.
	//
	// If the value is not specified, the pessimistic read lock is used.
	TransactionOptions_ReadWrite_READ_LOCK_MODE_UNSPECIFIED TransactionOptions_ReadWrite_ReadLockMode = 0
	// Pessimistic lock mode.
	//
	// Read locks are acquired immediately on read.
	TransactionOptions_ReadWrite_PESSIMISTIC TransactionOptions_ReadWrite_ReadLockMode = 1
	// Optimistic lock mode.
	//
	// Locks for reads within the transaction are not acquired on read.
	// Instead the locks are acquired on a commit to validate that
	// read/queried data has not changed since the transaction started.
	TransactionOptions_ReadWrite_OPTIMISTIC TransactionOptions_ReadWrite_ReadLockMode = 2
)

// Enum value maps for TransactionOptions_ReadWrite_ReadLockMode.
var (
	TransactionOptions_ReadWrite_ReadLockMode_name = map[int32]string{
		0: "READ_LOCK_MODE_UNSPECIFIED",
		1: "PESSIMISTIC",
		2: "OPTIMISTIC",
	}
	TransactionOptions_ReadWrite_ReadLockMode_value = map[string]int32{
		"READ_LOCK_MODE_UNSPECIFIED": 0,
		"PESSIMISTIC":                1,
		"OPTIMISTIC":                 2,
	}
)

func (x TransactionOptions_ReadWrite_ReadLockMode) Enum() *TransactionOptions_ReadWrite_ReadLockMode {
	p := new(TransactionOptions_ReadWrite_ReadLockMode)
	*p = x
	return p
}

func (x TransactionOptions_ReadWrite_ReadLockMode) String() string {
	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
}

func (TransactionOptions_ReadWrite_ReadLockMode) Descriptor() protoreflect.EnumDescriptor {
	return file_google_spanner_v1_transaction_proto_enumTypes[0].Descriptor()
}

func (TransactionOptions_ReadWrite_ReadLockMode) Type() protoreflect.EnumType {
	return &file_google_spanner_v1_transaction_proto_enumTypes[0]
}

func (x TransactionOptions_ReadWrite_ReadLockMode) Number() protoreflect.EnumNumber {
	return protoreflect.EnumNumber(x)
}

// Deprecated: Use TransactionOptions_ReadWrite_ReadLockMode.Descriptor instead.
func (TransactionOptions_ReadWrite_ReadLockMode) EnumDescriptor() ([]byte, []int) {
	return file_google_spanner_v1_transaction_proto_rawDescGZIP(), []int{0, 0, 0}
}

// Transactions:
//
// Each session can have at most one active transaction at a time (note that
// standalone reads and queries use a transaction internally and do count
// towards the one transaction limit). After the active transaction is
// completed, the session can immediately be re-used for the next transaction.
// It is not necessary to create a new session for each transaction.
//
// Transaction modes:
//
// Cloud Spanner supports three transaction modes:
//
//  1. Locking read-write. This type of transaction is the only way
//     to write data into Cloud Spanner. These transactions rely on
//     pessimistic locking and, if necessary, two-phase commit.
//     Locking read-write transactions may abort, requiring the
//     application to retry.
//
//  2. Snapshot read-only. Snapshot read-only transactions provide guaranteed
//     consistency across several reads, but do not allow
//     writes. Snapshot read-only transactions can be configured to read at
//     timestamps in the past, or configured to perform a strong read
//     (where Spanner will select a timestamp such that the read is
//     guaranteed to see the effects of all transactions that have committed
//     before the start of the read). Snapshot read-only transactions do not
//     need to be committed.
//
//     Queries on change streams must be performed with the snapshot read-only
//     transaction mode, specifying a strong read. Please see
//     [TransactionOptions.ReadOnly.strong][google.spanner.v1.TransactionOptions.ReadOnly.strong]
//     for more details.
//
//  3. Partitioned DML. This type of transaction is used to execute
//     a single Partitioned DML statement. Partitioned DML partitions
//     the key space and runs the DML statement over each partition
//     in parallel using separate, internal transactions that commit
//     independently. Partitioned DML transactions do not need to be
//     committed.
//
// For transactions that only read, snapshot read-only transactions
// provide simpler semantics and are almost always faster. In
// particular, read-only transactions do not take locks, so they do
// not conflict with read-write transactions. As a consequence of not
// taking locks, they also do not abort, so retry loops are not needed.
//
// Transactions may only read-write data in a single database. They
// may, however, read-write data in different tables within that
// database.
//
// Locking read-write transactions:
//
// Locking transactions may be used to atomically read-modify-write
// data anywhere in a database. This type of transaction is externally
// consistent.
//
// Clients should attempt to minimize the amount of time a transaction
// is active. Faster transactions commit with higher probability
// and cause less contention. Cloud Spanner attempts to keep read locks
// active as long as the transaction continues to do reads, and the
// transaction has not been terminated by
// [Commit][google.spanner.v1.Spanner.Commit] or
// [Rollback][google.spanner.v1.Spanner.Rollback]. Long periods of
// inactivity at the client may cause Cloud Spanner to release a
// transaction's locks and abort it.
//
// Conceptually, a read-write transaction consists of zero or more
// reads or SQL statements followed by
// [Commit][google.spanner.v1.Spanner.Commit]. At any time before
// [Commit][google.spanner.v1.Spanner.Commit], the client can send a
// [Rollback][google.spanner.v1.Spanner.Rollback] request to abort the
// transaction.
//
// Semantics:
//
// Cloud Spanner can commit the transaction if all read locks it acquired
// are still valid at commit time, and it is able to acquire write
// locks for all writes. Cloud Spanner can abort the transaction for any
// reason. If a commit attempt returns `ABORTED`, Cloud Spanner guarantees
// that the transaction has not modified any user data in Cloud Spanner.
//
// Unless the transaction commits, Cloud Spanner makes no guarantees about
// how long the transaction's locks were held for. It is an error to
// use Cloud Spanner locks for any sort of mutual exclusion other than
// between Cloud Spanner transactions themselves.
//
// Retrying aborted transactions:
//
// When a transaction aborts, the application can choose to retry the
// whole transaction again. To maximize the chances of successfully
// committing the retry, the client should execute the retry in the
// same session as the original attempt. The original session's lock
// priority increases with each consecutive abort, meaning that each
// attempt has a slightly better chance of success than the previous.
//
// Under some circumstances (for example, many transactions attempting to
// modify the same row(s)), a transaction can abort many times in a
// short period before successfully committing. Thus, it is not a good
// idea to cap the number of retries a transaction can attempt;
// instead, it is better to limit the total amount of time spent
// retrying.
//
// Idle transactions:
//
// A transaction is considered idle if it has no outstanding reads or
// SQL queries and has not started a read or SQL query within the last 10
// seconds. Idle transactions can be aborted by Cloud Spanner so that they
// don't hold on to locks indefinitely. If an idle transaction is aborted, the
// commit will fail with error `ABORTED`.
//
// If this behavior is undesirable, periodically executing a simple
// SQL query in the transaction (for example, `SELECT 1`) prevents the
// transaction from becoming idle.
//
// Snapshot read-only transactions:
//
// Snapshot read-only transactions provides a simpler method than
// locking read-write transactions for doing several consistent
// reads. However, this type of transaction does not support writes.
//
// Snapshot transactions do not take locks. Instead, they work by
// choosing a Cloud Spanner timestamp, then executing all reads at that
// timestamp. Since they do not acquire locks, they do not block
// concurrent read-write transactions.
//
// Unlike locking read-write transactions, snapshot read-only
// transactions never abort. They can fail if the chosen read
// timestamp is garbage collected; however, the default garbage
// collection policy is generous enough that most applications do not
// need to worry about this in practice.
//
// Snapshot read-only transactions do not need to call
// [Commit][google.spanner.v1.Spanner.Commit] or
// [Rollback][google.spanner.v1.Spanner.Rollback] (and in fact are not
// permitted to do so).
//
// To execute a snapshot transaction, the client specifies a timestamp
// bound, which tells Cloud Spanner how to choose a read timestamp.
//
// The types of timestamp bound are:
//
//   - Strong (the default).
//   - Bounded staleness.
//   - Exact staleness.
//
// If the Cloud Spanner database to be read is geographically distributed,
// stale read-only transactions can execute more quickly than strong
// or read-write transactions, because they are able to execute far
// from the leader replica.
//
// Each type of timestamp bound is discussed in detail below.
//
// Strong: Strong reads are guaranteed to see the effects of all transactions
// that have committed before the start of the read. Furthermore, all
// rows yielded by a single read are consistent with each other -- if
// any part of the read observes a transaction, all parts of the read
// see the transaction.
//
// Strong reads are not repeatable: two consecutive strong read-only
// transactions might return inconsistent results if there are
// concurrent writes. If consistency across reads is required, the
// reads should be executed within a transaction or at an exact read
// timestamp.
//
// Queries on change streams (see below for more details) must also specify
// the strong read timestamp bound.
//
// See
// [TransactionOptions.ReadOnly.strong][google.spanner.v1.TransactionOptions.ReadOnly.strong].
//
// Exact staleness:
//
// These timestamp bounds execute reads at a user-specified
// timestamp. Reads at a timestamp are guaranteed to see a consistent
// prefix of the global transaction history: they observe
// modifications done by all transactions with a commit timestamp less than or
// equal to the read timestamp, and observe none of the modifications done by
// transactions with a larger commit timestamp. They will block until
// all conflicting transactions that may be assigned commit timestamps
// <= the read timestamp have finished.
//
// The timestamp can either be expressed as an absolute Cloud Spanner commit
// timestamp or a staleness relative to the current time.
//
// These modes do not require a "negotiation phase" to pick a
// timestamp. As a result, they execute slightly faster than the
// equivalent boundedly stale concurrency modes. On the other hand,
// boundedly stale reads usually return fresher results.
//
// See
// [TransactionOptions.ReadOnly.read_timestamp][google.spanner.v1.TransactionOptions.ReadOnly.read_timestamp]
// and
// [TransactionOptions.ReadOnly.exact_staleness][google.spanner.v1.TransactionOptions.ReadOnly.exact_staleness].
//
// Bounded staleness:
//
// Bounded staleness modes allow Cloud Spanner to pick the read timestamp,
// subject to a user-provided staleness bound. Cloud Spanner chooses the
// newest timestamp within the staleness bound that allows execution
// of the reads at the closest available replica without blocking.
//
// All rows yielded are consistent with each other -- if any part of
// the read observes a transaction, all parts of the read see the
// transaction. Boundedly stale reads are not repeatable: two stale
// reads, even if they use the same staleness bound, can execute at
// different timestamps and thus return inconsistent results.
//
// Boundedly stale reads execute in two phases: the first phase
// negotiates a timestamp among all replicas needed to serve the
// read. In the second phase, reads are executed at the negotiated
// timestamp.
//
// As a result of the two phase execution, bounded staleness reads are
// usually a little slower than comparable exact staleness
// reads. However, they are typically able to return fresher
// results, and are more likely to execute at the closest replica.
//
// Because the timestamp negotiation requires up-front knowledge of
// which rows will be read, it can only be used with single-use
// read-only transactions.
//
// See
// [TransactionOptions.ReadOnly.max_staleness][google.spanner.v1.TransactionOptions.ReadOnly.max_staleness]
// and
// [TransactionOptions.ReadOnly.min_read_timestamp][google.spanner.v1.TransactionOptions.ReadOnly.min_read_timestamp].
//
// Old read timestamps and garbage collection:
//
// Cloud Spanner continuously garbage collects deleted and overwritten data
// in the background to reclaim storage space. This process is known
// as "version GC". By default, version GC reclaims versions after they
// are one hour old. Because of this, Cloud Spanner cannot perform reads
// at read timestamps more than one hour in the past. This
// restriction also applies to in-progress reads and/or SQL queries whose
// timestamp become too old while executing. Reads and SQL queries with
// too-old read timestamps fail with the error `FAILED_PRECONDITION`.
//
// You can configure and extend the `VERSION_RETENTION_PERIOD` of a
// database up to a period as long as one week, which allows Cloud Spanner
// to perform reads up to one week in the past.
//
// Querying change Streams:
//
// A Change Stream is a schema object that can be configured to watch data
// changes on the entire database, a set of tables, or a set of columns
// in a database.
//
// When a change stream is created, Spanner automatically defines a
// corresponding SQL Table-Valued Function (TVF) that can be used to query
// the change records in the associated change stream using the
// ExecuteStreamingSql API. The name of the TVF for a change stream is
// generated from the name of the change stream: READ_<change_stream_name>.
//
// All queries on change stream TVFs must be executed using the
// ExecuteStreamingSql API with a single-use read-only transaction with a
// strong read-only timestamp_bound. The change stream TVF allows users to
// specify the start_timestamp and end_timestamp for the time range of
// interest. All change records within the retention period is accessible
// using the strong read-only timestamp_bound. All other TransactionOptions
// are invalid for change stream queries.
//
// In addition, if TransactionOptions.read_only.return_read_timestamp is set
// to true, a special value of 2^63 - 2 will be returned in the
// [Transaction][google.spanner.v1.Transaction] message that describes the
// transaction, instead of a valid read timestamp. This special value should be
// discarded and not used for any subsequent queries.
//
// Please see https://cloud.google.com/spanner/docs/change-streams
// for more details on how to query the change stream TVFs.
//
// Partitioned DML transactions:
//
// Partitioned DML transactions are used to execute DML statements with a
// different execution strategy that provides different, and often better,
// scalability properties for large, table-wide operations than DML in a
// ReadWrite transaction. Smaller scoped statements, such as an OLTP workload,
// should prefer using ReadWrite transactions.
//
// Partitioned DML partitions the keyspace and runs the DML statement on each
// partition in separate, internal transactions. These transactions commit
// automatically when complete, and run independently from one another.
//
// To reduce lock contention, this execution strategy only acquires read locks
// on rows that match the WHERE clause of the statement. Additionally, the
// smaller per-partition transactions hold locks for less time.
//
// That said, Partitioned DML is not a drop-in replacement for standard DML used
// in ReadWrite transactions.
//
//   - The DML statement must be fully-partitionable. Specifically, the statement
//     must be expressible as the union of many statements which each access only
//     a single row of the table.
//
//   - The statement is not applied atomically to all rows of the table. Rather,
//     the statement is applied atomically to partitions of the table, in
//     independent transactions. Secondary index rows are updated atomically
//     with the base table rows.
//
//   - Partitioned DML does not guarantee exactly-once execution semantics
//     against a partition. The statement will be applied at least once to each
//     partition. It is strongly recommended that the DML statement should be
//     idempotent to avoid unexpected results. For instance, it is potentially
//     dangerous to run a statement such as
//     `UPDATE table SET column = column + 1` as it could be run multiple times
//     against some rows.
//
//   - The partitions are committed automatically - there is no support for
//     Commit or Rollback. If the call returns an error, or if the client issuing
//     the ExecuteSql call dies, it is possible that some rows had the statement
//     executed on them successfully. It is also possible that statement was
//     never executed against other rows.
//
//   - Partitioned DML transactions may only contain the execution of a single
//     DML statement via ExecuteSql or ExecuteStreamingSql.
//
//   - If any error is encountered during the execution of the partitioned DML
//     operation (for instance, a UNIQUE INDEX violation, division by zero, or a
//     value that cannot be stored due to schema constraints), then the
//     operation is stopped at that point and an error is returned. It is
//     possible that at this point, some partitions have been committed (or even
//     committed multiple times), and other partitions have not been run at all.
//
// Given the above, Partitioned DML is good fit for large, database-wide,
// operations that are idempotent, such as deleting old rows from a very large
// table.
type TransactionOptions struct {
	state         protoimpl.MessageState
	sizeCache     protoimpl.SizeCache
	unknownFields protoimpl.UnknownFields

	// Required. The type of transaction.
	//
	// Types that are assignable to Mode:
	//
	//	*TransactionOptions_ReadWrite_
	//	*TransactionOptions_PartitionedDml_
	//	*TransactionOptions_ReadOnly_
	Mode isTransactionOptions_Mode `protobuf_oneof:"mode"`
	// When `exclude_txn_from_change_streams` is set to `true`:
	//   - Mutations from this transaction will not be recorded in change streams
	//     with DDL option `allow_txn_exclusion=true` that are tracking columns
	//     modified by these transactions.
	//   - Mutations from this transaction will be recorded in change streams with
	//     DDL option `allow_txn_exclusion=false or not set` that are tracking
	//     columns modified by these transactions.
	//
	// When `exclude_txn_from_change_streams` is set to `false` or not set,
	// mutations from this transaction will be recorded in all change streams that
	// are tracking columns modified by these transactions.
	// `exclude_txn_from_change_streams` may only be specified for read-write or
	// partitioned-dml transactions, otherwise the API will return an
	// `INVALID_ARGUMENT` error.
	ExcludeTxnFromChangeStreams bool `protobuf:"varint,5,opt,name=exclude_txn_from_change_streams,json=excludeTxnFromChangeStreams,proto3" json:"exclude_txn_from_change_streams,omitempty"`
}

func (x *TransactionOptions) Reset() {
	*x = TransactionOptions{}
	if protoimpl.UnsafeEnabled {
		mi := &file_google_spanner_v1_transaction_proto_msgTypes[0]
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		ms.StoreMessageInfo(mi)
	}
}

func (x *TransactionOptions) String() string {
	return protoimpl.X.MessageStringOf(x)
}

func (*TransactionOptions) ProtoMessage() {}

func (x *TransactionOptions) ProtoReflect() protoreflect.Message {
	mi := &file_google_spanner_v1_transaction_proto_msgTypes[0]
	if protoimpl.UnsafeEnabled && x != nil {
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		if ms.LoadMessageInfo() == nil {
			ms.StoreMessageInfo(mi)
		}
		return ms
	}
	return mi.MessageOf(x)
}

// Deprecated: Use TransactionOptions.ProtoReflect.Descriptor instead.
func (*TransactionOptions) Descriptor() ([]byte, []int) {
	return file_google_spanner_v1_transaction_proto_rawDescGZIP(), []int{0}
}

func (m *TransactionOptions) GetMode() isTransactionOptions_Mode {
	if m != nil {
		return m.Mode
	}
	return nil
}

func (x *TransactionOptions) GetReadWrite() *TransactionOptions_ReadWrite {
	if x, ok := x.GetMode().(*TransactionOptions_ReadWrite_); ok {
		return x.ReadWrite
	}
	return nil
}

func (x *TransactionOptions) GetPartitionedDml() *TransactionOptions_PartitionedDml {
	if x, ok := x.GetMode().(*TransactionOptions_PartitionedDml_); ok {
		return x.PartitionedDml
	}
	return nil
}

func (x *TransactionOptions) GetReadOnly() *TransactionOptions_ReadOnly {
	if x, ok := x.GetMode().(*TransactionOptions_ReadOnly_); ok {
		return x.ReadOnly
	}
	return nil
}

func (x *TransactionOptions) GetExcludeTxnFromChangeStreams() bool {
	if x != nil {
		return x.ExcludeTxnFromChangeStreams
	}
	return false
}

type isTransactionOptions_Mode interface {
	isTransactionOptions_Mode()
}

type TransactionOptions_ReadWrite_ struct {
	// Transaction may write.
	//
	// Authorization to begin a read-write transaction requires
	// `spanner.databases.beginOrRollbackReadWriteTransaction` permission
	// on the `session` resource.
	ReadWrite *TransactionOptions_ReadWrite `protobuf:"bytes,1,opt,name=read_write,json=readWrite,proto3,oneof"`
}

type TransactionOptions_PartitionedDml_ struct {
	// Partitioned DML transaction.
	//
	// Authorization to begin a Partitioned DML transaction requires
	// `spanner.databases.beginPartitionedDmlTransaction` permission
	// on the `session` resource.
	PartitionedDml *TransactionOptions_PartitionedDml `protobuf:"bytes,3,opt,name=partitioned_dml,json=partitionedDml,proto3,oneof"`
}

type TransactionOptions_ReadOnly_ struct {
	// Transaction will not write.
	//
	// Authorization to begin a read-only transaction requires
	// `spanner.databases.beginReadOnlyTransaction` permission
	// on the `session` resource.
	ReadOnly *TransactionOptions_ReadOnly `protobuf:"bytes,2,opt,name=read_only,json=readOnly,proto3,oneof"`
}

func (*TransactionOptions_ReadWrite_) isTransactionOptions_Mode() {}

func (*TransactionOptions_PartitionedDml_) isTransactionOptions_Mode() {}

func (*TransactionOptions_ReadOnly_) isTransactionOptions_Mode() {}

// A transaction.
type Transaction struct {
	state         protoimpl.MessageState
	sizeCache     protoimpl.SizeCache
	unknownFields protoimpl.UnknownFields

	// `id` may be used to identify the transaction in subsequent
	// [Read][google.spanner.v1.Spanner.Read],
	// [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql],
	// [Commit][google.spanner.v1.Spanner.Commit], or
	// [Rollback][google.spanner.v1.Spanner.Rollback] calls.
	//
	// Single-use read-only transactions do not have IDs, because
	// single-use transactions do not support multiple requests.
	Id []byte `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
	// For snapshot read-only transactions, the read timestamp chosen
	// for the transaction. Not returned by default: see
	// [TransactionOptions.ReadOnly.return_read_timestamp][google.spanner.v1.TransactionOptions.ReadOnly.return_read_timestamp].
	//
	// A timestamp in RFC3339 UTC \"Zulu\" format, accurate to nanoseconds.
	// Example: `"2014-10-02T15:01:23.045123456Z"`.
	ReadTimestamp *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=read_timestamp,json=readTimestamp,proto3" json:"read_timestamp,omitempty"`
}

func (x *Transaction) Reset() {
	*x = Transaction{}
	if protoimpl.UnsafeEnabled {
		mi := &file_google_spanner_v1_transaction_proto_msgTypes[1]
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		ms.StoreMessageInfo(mi)
	}
}

func (x *Transaction) String() string {
	return protoimpl.X.MessageStringOf(x)
}

func (*Transaction) ProtoMessage() {}

func (x *Transaction) ProtoReflect() protoreflect.Message {
	mi := &file_google_spanner_v1_transaction_proto_msgTypes[1]
	if protoimpl.UnsafeEnabled && x != nil {
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		if ms.LoadMessageInfo() == nil {
			ms.StoreMessageInfo(mi)
		}
		return ms
	}
	return mi.MessageOf(x)
}

// Deprecated: Use Transaction.ProtoReflect.Descriptor instead.
func (*Transaction) Descriptor() ([]byte, []int) {
	return file_google_spanner_v1_transaction_proto_rawDescGZIP(), []int{1}
}

func (x *Transaction) GetId() []byte {
	if x != nil {
		return x.Id
	}
	return nil
}

func (x *Transaction) GetReadTimestamp() *timestamppb.Timestamp {
	if x != nil {
		return x.ReadTimestamp
	}
	return nil
}

// This message is used to select the transaction in which a
// [Read][google.spanner.v1.Spanner.Read] or
// [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] call runs.
//
// See [TransactionOptions][google.spanner.v1.TransactionOptions] for more
// information about transactions.
type TransactionSelector struct {
	state         protoimpl.MessageState
	sizeCache     protoimpl.SizeCache
	unknownFields protoimpl.UnknownFields

	// If no fields are set, the default is a single use transaction
	// with strong concurrency.
	//
	// Types that are assignable to Selector:
	//
	//	*TransactionSelector_SingleUse
	//	*TransactionSelector_Id
	//	*TransactionSelector_Begin
	Selector isTransactionSelector_Selector `protobuf_oneof:"selector"`
}

func (x *TransactionSelector) Reset() {
	*x = TransactionSelector{}
	if protoimpl.UnsafeEnabled {
		mi := &file_google_spanner_v1_transaction_proto_msgTypes[2]
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		ms.StoreMessageInfo(mi)
	}
}

func (x *TransactionSelector) String() string {
	return protoimpl.X.MessageStringOf(x)
}

func (*TransactionSelector) ProtoMessage() {}

func (x *TransactionSelector) ProtoReflect() protoreflect.Message {
	mi := &file_google_spanner_v1_transaction_proto_msgTypes[2]
	if protoimpl.UnsafeEnabled && x != nil {
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		if ms.LoadMessageInfo() == nil {
			ms.StoreMessageInfo(mi)
		}
		return ms
	}
	return mi.MessageOf(x)
}

// Deprecated: Use TransactionSelector.ProtoReflect.Descriptor instead.
func (*TransactionSelector) Descriptor() ([]byte, []int) {
	return file_google_spanner_v1_transaction_proto_rawDescGZIP(), []int{2}
}

func (m *TransactionSelector) GetSelector() isTransactionSelector_Selector {
	if m != nil {
		return m.Selector
	}
	return nil
}

func (x *TransactionSelector) GetSingleUse() *TransactionOptions {
	if x, ok := x.GetSelector().(*TransactionSelector_SingleUse); ok {
		return x.SingleUse
	}
	return nil
}

func (x *TransactionSelector) GetId() []byte {
	if x, ok := x.GetSelector().(*TransactionSelector_Id); ok {
		return x.Id
	}
	return nil
}

func (x *TransactionSelector) GetBegin() *TransactionOptions {
	if x, ok := x.GetSelector().(*TransactionSelector_Begin); ok {
		return x.Begin
	}
	return nil
}

type isTransactionSelector_Selector interface {
	isTransactionSelector_Selector()
}

type TransactionSelector_SingleUse struct {
	// Execute the read or SQL query in a temporary transaction.
	// This is the most efficient way to execute a transaction that
	// consists of a single SQL query.
	SingleUse *TransactionOptions `protobuf:"bytes,1,opt,name=single_use,json=singleUse,proto3,oneof"`
}

type TransactionSelector_Id struct {
	// Execute the read or SQL query in a previously-started transaction.
	Id []byte `protobuf:"bytes,2,opt,name=id,proto3,oneof"`
}

type TransactionSelector_Begin struct {
	// Begin a new transaction and execute this read or SQL query in
	// it. The transaction ID of the new transaction is returned in
	// [ResultSetMetadata.transaction][google.spanner.v1.ResultSetMetadata.transaction],
	// which is a [Transaction][google.spanner.v1.Transaction].
	Begin *TransactionOptions `protobuf:"bytes,3,opt,name=begin,proto3,oneof"`
}

func (*TransactionSelector_SingleUse) isTransactionSelector_Selector() {}

func (*TransactionSelector_Id) isTransactionSelector_Selector() {}

func (*TransactionSelector_Begin) isTransactionSelector_Selector() {}

// Message type to initiate a read-write transaction. Currently this
// transaction type has no options.
type TransactionOptions_ReadWrite struct {
	state         protoimpl.MessageState
	sizeCache     protoimpl.SizeCache
	unknownFields protoimpl.UnknownFields

	// Read lock mode for the transaction.
	ReadLockMode TransactionOptions_ReadWrite_ReadLockMode `protobuf:"varint,1,opt,name=read_lock_mode,json=readLockMode,proto3,enum=google.spanner.v1.TransactionOptions_ReadWrite_ReadLockMode" json:"read_lock_mode,omitempty"`
}

func (x *TransactionOptions_ReadWrite) Reset() {
	*x = TransactionOptions_ReadWrite{}
	if protoimpl.UnsafeEnabled {
		mi := &file_google_spanner_v1_transaction_proto_msgTypes[3]
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		ms.StoreMessageInfo(mi)
	}
}

func (x *TransactionOptions_ReadWrite) String() string {
	return protoimpl.X.MessageStringOf(x)
}

func (*TransactionOptions_ReadWrite) ProtoMessage() {}

func (x *TransactionOptions_ReadWrite) ProtoReflect() protoreflect.Message {
	mi := &file_google_spanner_v1_transaction_proto_msgTypes[3]
	if protoimpl.UnsafeEnabled && x != nil {
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		if ms.LoadMessageInfo() == nil {
			ms.StoreMessageInfo(mi)
		}
		return ms
	}
	return mi.MessageOf(x)
}

// Deprecated: Use TransactionOptions_ReadWrite.ProtoReflect.Descriptor instead.
func (*TransactionOptions_ReadWrite) Descriptor() ([]byte, []int) {
	return file_google_spanner_v1_transaction_proto_rawDescGZIP(), []int{0, 0}
}

func (x *TransactionOptions_ReadWrite) GetReadLockMode() TransactionOptions_ReadWrite_ReadLockMode {
	if x != nil {
		return x.ReadLockMode
	}
	return TransactionOptions_ReadWrite_READ_LOCK_MODE_UNSPECIFIED
}

// Message type to initiate a Partitioned DML transaction.
type TransactionOptions_PartitionedDml struct {
	state         protoimpl.MessageState
	sizeCache     protoimpl.SizeCache
	unknownFields protoimpl.UnknownFields
}

func (x *TransactionOptions_PartitionedDml) Reset() {
	*x = TransactionOptions_PartitionedDml{}
	if protoimpl.UnsafeEnabled {
		mi := &file_google_spanner_v1_transaction_proto_msgTypes[4]
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		ms.StoreMessageInfo(mi)
	}
}

func (x *TransactionOptions_PartitionedDml) String() string {
	return protoimpl.X.MessageStringOf(x)
}

func (*TransactionOptions_PartitionedDml) ProtoMessage() {}

func (x *TransactionOptions_PartitionedDml) ProtoReflect() protoreflect.Message {
	mi := &file_google_spanner_v1_transaction_proto_msgTypes[4]
	if protoimpl.UnsafeEnabled && x != nil {
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		if ms.LoadMessageInfo() == nil {
			ms.StoreMessageInfo(mi)
		}
		return ms
	}
	return mi.MessageOf(x)
}

// Deprecated: Use TransactionOptions_PartitionedDml.ProtoReflect.Descriptor instead.
func (*TransactionOptions_PartitionedDml) Descriptor() ([]byte, []int) {
	return file_google_spanner_v1_transaction_proto_rawDescGZIP(), []int{0, 1}
}

// Message type to initiate a read-only transaction.
type TransactionOptions_ReadOnly struct {
	state         protoimpl.MessageState
	sizeCache     protoimpl.SizeCache
	unknownFields protoimpl.UnknownFields

	// How to choose the timestamp for the read-only transaction.
	//
	// Types that are assignable to TimestampBound:
	//
	//	*TransactionOptions_ReadOnly_Strong
	//	*TransactionOptions_ReadOnly_MinReadTimestamp
	//	*TransactionOptions_ReadOnly_MaxStaleness
	//	*TransactionOptions_ReadOnly_ReadTimestamp
	//	*TransactionOptions_ReadOnly_ExactStaleness
	TimestampBound isTransactionOptions_ReadOnly_TimestampBound `protobuf_oneof:"timestamp_bound"`
	// If true, the Cloud Spanner-selected read timestamp is included in
	// the [Transaction][google.spanner.v1.Transaction] message that describes
	// the transaction.
	ReturnReadTimestamp bool `protobuf:"varint,6,opt,name=return_read_timestamp,json=returnReadTimestamp,proto3" json:"return_read_timestamp,omitempty"`
}

func (x *TransactionOptions_ReadOnly) Reset() {
	*x = TransactionOptions_ReadOnly{}
	if protoimpl.UnsafeEnabled {
		mi := &file_google_spanner_v1_transaction_proto_msgTypes[5]
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		ms.StoreMessageInfo(mi)
	}
}

func (x *TransactionOptions_ReadOnly) String() string {
	return protoimpl.X.MessageStringOf(x)
}

func (*TransactionOptions_ReadOnly) ProtoMessage() {}

func (x *TransactionOptions_ReadOnly) ProtoReflect() protoreflect.Message {
	mi := &file_google_spanner_v1_transaction_proto_msgTypes[5]
	if protoimpl.UnsafeEnabled && x != nil {
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		if ms.LoadMessageInfo() == nil {
			ms.StoreMessageInfo(mi)
		}
		return ms
	}
	return mi.MessageOf(x)
}

// Deprecated: Use TransactionOptions_ReadOnly.ProtoReflect.Descriptor instead.
func (*TransactionOptions_ReadOnly) Descriptor() ([]byte, []int) {
	return file_google_spanner_v1_transaction_proto_rawDescGZIP(), []int{0, 2}
}

func (m *TransactionOptions_ReadOnly) GetTimestampBound() isTransactionOptions_ReadOnly_TimestampBound {
	if m != nil {
		return m.TimestampBound
	}
	return nil
}

func (x *TransactionOptions_ReadOnly) GetStrong() bool {
	if x, ok := x.GetTimestampBound().(*TransactionOptions_ReadOnly_Strong); ok {
		return x.Strong
	}
	return false
}

func (x *TransactionOptions_ReadOnly) GetMinReadTimestamp() *timestamppb.Timestamp {
	if x, ok := x.GetTimestampBound().(*TransactionOptions_ReadOnly_MinReadTimestamp); ok {
		return x.MinReadTimestamp
	}
	return nil
}

func (x *TransactionOptions_ReadOnly) GetMaxStaleness() *durationpb.Duration {
	if x, ok := x.GetTimestampBound().(*TransactionOptions_ReadOnly_MaxStaleness); ok {
		return x.MaxStaleness
	}
	return nil
}

func (x *TransactionOptions_ReadOnly) GetReadTimestamp() *timestamppb.Timestamp {
	if x, ok := x.GetTimestampBound().(*TransactionOptions_ReadOnly_ReadTimestamp); ok {
		return x.ReadTimestamp
	}
	return nil
}

func (x *TransactionOptions_ReadOnly) GetExactStaleness() *durationpb.Duration {
	if x, ok := x.GetTimestampBound().(*TransactionOptions_ReadOnly_ExactStaleness); ok {
		return x.ExactStaleness
	}
	return nil
}

func (x *TransactionOptions_ReadOnly) GetReturnReadTimestamp() bool {
	if x != nil {
		return x.ReturnReadTimestamp
	}
	return false
}

type isTransactionOptions_ReadOnly_TimestampBound interface {
	isTransactionOptions_ReadOnly_TimestampBound()
}

type TransactionOptions_ReadOnly_Strong struct {
	// Read at a timestamp where all previously committed transactions
	// are visible.
	Strong bool `protobuf:"varint,1,opt,name=strong,proto3,oneof"`
}

type TransactionOptions_ReadOnly_MinReadTimestamp struct {
	// Executes all reads at a timestamp >= `min_read_timestamp`.
	//
	// This is useful for requesting fresher data than some previous
	// read, or data that is fresh enough to observe the effects of some
	// previously committed transaction whose timestamp is known.
	//
	// Note that this option can only be used in single-use transactions.
	//
	// A timestamp in RFC3339 UTC \"Zulu\" format, accurate to nanoseconds.
	// Example: `"2014-10-02T15:01:23.045123456Z"`.
	MinReadTimestamp *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=min_read_timestamp,json=minReadTimestamp,proto3,oneof"`
}

type TransactionOptions_ReadOnly_MaxStaleness struct {
	// Read data at a timestamp >= `NOW - max_staleness`
	// seconds. Guarantees that all writes that have committed more
	// than the specified number of seconds ago are visible. Because
	// Cloud Spanner chooses the exact timestamp, this mode works even if
	// the client's local clock is substantially skewed from Cloud Spanner
	// commit timestamps.
	//
	// Useful for reading the freshest data available at a nearby
	// replica, while bounding the possible staleness if the local
	// replica has fallen behind.
	//
	// Note that this option can only be used in single-use
	// transactions.
	MaxStaleness *durationpb.Duration `protobuf:"bytes,3,opt,name=max_staleness,json=maxStaleness,proto3,oneof"`
}

type TransactionOptions_ReadOnly_ReadTimestamp struct {
	// Executes all reads at the given timestamp. Unlike other modes,
	// reads at a specific timestamp are repeatable; the same read at
	// the same timestamp always returns the same data. If the
	// timestamp is in the future, the read will block until the
	// specified timestamp, modulo the read's deadline.
	//
	// Useful for large scale consistent reads such as mapreduces, or
	// for coordinating many reads against a consistent snapshot of the
	// data.
	//
	// A timestamp in RFC3339 UTC \"Zulu\" format, accurate to nanoseconds.
	// Example: `"2014-10-02T15:01:23.045123456Z"`.
	ReadTimestamp *timestamppb.Timestamp `protobuf:"bytes,4,opt,name=read_timestamp,json=readTimestamp,proto3,oneof"`
}

type TransactionOptions_ReadOnly_ExactStaleness struct {
	// Executes all reads at a timestamp that is `exact_staleness`
	// old. The timestamp is chosen soon after the read is started.
	//
	// Guarantees that all writes that have committed more than the
	// specified number of seconds ago are visible. Because Cloud Spanner
	// chooses the exact timestamp, this mode works even if the client's
	// local clock is substantially skewed from Cloud Spanner commit
	// timestamps.
	//
	// Useful for reading at nearby replicas without the distributed
	// timestamp negotiation overhead of `max_staleness`.
	ExactStaleness *durationpb.Duration `protobuf:"bytes,5,opt,name=exact_staleness,json=exactStaleness,proto3,oneof"`
}

func (*TransactionOptions_ReadOnly_Strong) isTransactionOptions_ReadOnly_TimestampBound() {}

func (*TransactionOptions_ReadOnly_MinReadTimestamp) isTransactionOptions_ReadOnly_TimestampBound() {}

func (*TransactionOptions_ReadOnly_MaxStaleness) isTransactionOptions_ReadOnly_TimestampBound() {}

func (*TransactionOptions_ReadOnly_ReadTimestamp) isTransactionOptions_ReadOnly_TimestampBound() {}

func (*TransactionOptions_ReadOnly_ExactStaleness) isTransactionOptions_ReadOnly_TimestampBound() {}

var File_google_spanner_v1_transaction_proto protoreflect.FileDescriptor

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}

var (
	file_google_spanner_v1_transaction_proto_rawDescOnce sync.Once
	file_google_spanner_v1_transaction_proto_rawDescData = file_google_spanner_v1_transaction_proto_rawDesc
)

func file_google_spanner_v1_transaction_proto_rawDescGZIP() []byte {
	file_google_spanner_v1_transaction_proto_rawDescOnce.Do(func() {
		file_google_spanner_v1_transaction_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_spanner_v1_transaction_proto_rawDescData)
	})
	return file_google_spanner_v1_transaction_proto_rawDescData
}

var file_google_spanner_v1_transaction_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
var file_google_spanner_v1_transaction_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
var file_google_spanner_v1_transaction_proto_goTypes = []interface{}{
	(TransactionOptions_ReadWrite_ReadLockMode)(0), // 0: google.spanner.v1.TransactionOptions.ReadWrite.ReadLockMode
	(*TransactionOptions)(nil),                     // 1: google.spanner.v1.TransactionOptions
	(*Transaction)(nil),                            // 2: google.spanner.v1.Transaction
	(*TransactionSelector)(nil),                    // 3: google.spanner.v1.TransactionSelector
	(*TransactionOptions_ReadWrite)(nil),           // 4: google.spanner.v1.TransactionOptions.ReadWrite
	(*TransactionOptions_PartitionedDml)(nil),      // 5: google.spanner.v1.TransactionOptions.PartitionedDml
	(*TransactionOptions_ReadOnly)(nil),            // 6: google.spanner.v1.TransactionOptions.ReadOnly
	(*timestamppb.Timestamp)(nil),                  // 7: google.protobuf.Timestamp
	(*durationpb.Duration)(nil),                    // 8: google.protobuf.Duration
}
var file_google_spanner_v1_transaction_proto_depIdxs = []int32{
	4,  // 0: google.spanner.v1.TransactionOptions.read_write:type_name -> google.spanner.v1.TransactionOptions.ReadWrite
	5,  // 1: google.spanner.v1.TransactionOptions.partitioned_dml:type_name -> google.spanner.v1.TransactionOptions.PartitionedDml
	6,  // 2: google.spanner.v1.TransactionOptions.read_only:type_name -> google.spanner.v1.TransactionOptions.ReadOnly
	7,  // 3: google.spanner.v1.Transaction.read_timestamp:type_name -> google.protobuf.Timestamp
	1,  // 4: google.spanner.v1.TransactionSelector.single_use:type_name -> google.spanner.v1.TransactionOptions
	1,  // 5: google.spanner.v1.TransactionSelector.begin:type_name -> google.spanner.v1.TransactionOptions
	0,  // 6: google.spanner.v1.TransactionOptions.ReadWrite.read_lock_mode:type_name -> google.spanner.v1.TransactionOptions.ReadWrite.ReadLockMode
	7,  // 7: google.spanner.v1.TransactionOptions.ReadOnly.min_read_timestamp:type_name -> google.protobuf.Timestamp
	8,  // 8: google.spanner.v1.TransactionOptions.ReadOnly.max_staleness:type_name -> google.protobuf.Duration
	7,  // 9: google.spanner.v1.TransactionOptions.ReadOnly.read_timestamp:type_name -> google.protobuf.Timestamp
	8,  // 10: google.spanner.v1.TransactionOptions.ReadOnly.exact_staleness:type_name -> google.protobuf.Duration
	11, // [11:11] is the sub-list for method output_type
	11, // [11:11] is the sub-list for method input_type
	11, // [11:11] is the sub-list for extension type_name
	11, // [11:11] is the sub-list for extension extendee
	0,  // [0:11] is the sub-list for field type_name
}

func init() { file_google_spanner_v1_transaction_proto_init() }
func file_google_spanner_v1_transaction_proto_init() {
	if File_google_spanner_v1_transaction_proto != nil {
		return
	}
	if !protoimpl.UnsafeEnabled {
		file_google_spanner_v1_transaction_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
			switch v := v.(*TransactionOptions); i {
			case 0:
				return &v.state
			case 1:
				return &v.sizeCache
			case 2:
				return &v.unknownFields
			default:
				return nil
			}
		}
		file_google_spanner_v1_transaction_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
			switch v := v.(*Transaction); i {
			case 0:
				return &v.state
			case 1:
				return &v.sizeCache
			case 2:
				return &v.unknownFields
			default:
				return nil
			}
		}
		file_google_spanner_v1_transaction_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
			switch v := v.(*TransactionSelector); i {
			case 0:
				return &v.state
			case 1:
				return &v.sizeCache
			case 2:
				return &v.unknownFields
			default:
				return nil
			}
		}
		file_google_spanner_v1_transaction_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
			switch v := v.(*TransactionOptions_ReadWrite); i {
			case 0:
				return &v.state
			case 1:
				return &v.sizeCache
			case 2:
				return &v.unknownFields
			default:
				return nil
			}
		}
		file_google_spanner_v1_transaction_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
			switch v := v.(*TransactionOptions_PartitionedDml); i {
			case 0:
				return &v.state
			case 1:
				return &v.sizeCache
			case 2:
				return &v.unknownFields
			default:
				return nil
			}
		}
		file_google_spanner_v1_transaction_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
			switch v := v.(*TransactionOptions_ReadOnly); i {
			case 0:
				return &v.state
			case 1:
				return &v.sizeCache
			case 2:
				return &v.unknownFields
			default:
				return nil
			}
		}
	}
	file_google_spanner_v1_transaction_proto_msgTypes[0].OneofWrappers = []interface{}{
		(*TransactionOptions_ReadWrite_)(nil),
		(*TransactionOptions_PartitionedDml_)(nil),
		(*TransactionOptions_ReadOnly_)(nil),
	}
	file_google_spanner_v1_transaction_proto_msgTypes[2].OneofWrappers = []interface{}{
		(*TransactionSelector_SingleUse)(nil),
		(*TransactionSelector_Id)(nil),
		(*TransactionSelector_Begin)(nil),
	}
	file_google_spanner_v1_transaction_proto_msgTypes[5].OneofWrappers = []interface{}{
		(*TransactionOptions_ReadOnly_Strong)(nil),
		(*TransactionOptions_ReadOnly_MinReadTimestamp)(nil),
		(*TransactionOptions_ReadOnly_MaxStaleness)(nil),
		(*TransactionOptions_ReadOnly_ReadTimestamp)(nil),
		(*TransactionOptions_ReadOnly_ExactStaleness)(nil),
	}
	type x struct{}
	out := protoimpl.TypeBuilder{
		File: protoimpl.DescBuilder{
			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
			RawDescriptor: file_google_spanner_v1_transaction_proto_rawDesc,
			NumEnums:      1,
			NumMessages:   6,
			NumExtensions: 0,
			NumServices:   0,
		},
		GoTypes:           file_google_spanner_v1_transaction_proto_goTypes,
		DependencyIndexes: file_google_spanner_v1_transaction_proto_depIdxs,
		EnumInfos:         file_google_spanner_v1_transaction_proto_enumTypes,
		MessageInfos:      file_google_spanner_v1_transaction_proto_msgTypes,
	}.Build()
	File_google_spanner_v1_transaction_proto = out.File
	file_google_spanner_v1_transaction_proto_rawDesc = nil
	file_google_spanner_v1_transaction_proto_goTypes = nil
	file_google_spanner_v1_transaction_proto_depIdxs = nil
}