Class: Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite

Inherits:
Object
  • Object
show all
Extended by:
Protobuf::MessageExts::ClassMethods
Includes:
Protobuf::MessageExts
Defined in:
proto_docs/google/spanner/v1/transaction.rb

Overview

Message type to initiate a read-write transaction. Currently this transaction type has no options.

Defined Under Namespace

Modules: ReadLockMode

Instance Attribute Summary collapse

Instance Attribute Details

#multiplexed_session_previous_transaction_id ⇒ ::String

Returns Optional. Clients should pass the transaction ID of the previous transaction attempt that was aborted if this transaction is being executed on a multiplexed session.

Returns:

  • (::String) —

    Optional. Clients should pass the transaction ID of the previous transaction attempt that was aborted if this transaction is being executed on a multiplexed session.



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# File 'proto_docs/google/spanner/v1/transaction.rb', line 89

class ReadWrite
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # `ReadLockMode` is used to set the read lock mode for read-write
  # transactions.
  module ReadLockMode
    # Default value.
    #
    # * If isolation level is
    #   {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE SERIALIZABLE},
    #   locking semantics default to `PESSIMISTIC`.
    # * If isolation level is
    #   {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::REPEATABLE_READ REPEATABLE_READ},
    #   locking semantics default to `OPTIMISTIC`.
    # * See
    #   [Concurrency
    #   control](https://cloud.google.com/spanner/docs/concurrency-control)
    #   for more details.
    READ_LOCK_MODE_UNSPECIFIED = 0

    # Pessimistic lock mode.
    #
    # Lock acquisition behavior depends on the isolation level in use. In
    # {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE SERIALIZABLE}
    # isolation, reads and writes acquire necessary locks during transaction
    # statement execution. In
    # {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::REPEATABLE_READ REPEATABLE_READ}
    # isolation, reads that explicitly request to be locked and writes
    # acquire locks.
    # See
    # [Concurrency
    # control](https://cloud.google.com/spanner/docs/concurrency-control) for
    # details on the types of locks acquired at each transaction step.
    PESSIMISTIC = 1

    # Optimistic lock mode.
    #
    # Lock acquisition behavior depends on the isolation level in use. In
    # both
    # {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE SERIALIZABLE}
    # and
    # {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::REPEATABLE_READ REPEATABLE_READ}
    # isolation, reads and writes do not acquire locks during transaction
    # statement execution.
    # See
    # [Concurrency
    # control](https://cloud.google.com/spanner/docs/concurrency-control) for
    # details on how the guarantees of each isolation level are provided at
    # commit time.
    OPTIMISTIC = 2
  end
end

#read_lock_mode ⇒ ::Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite::ReadLockMode

Returns Read lock mode for the transaction.

Returns:



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# File 'proto_docs/google/spanner/v1/transaction.rb', line 89

class ReadWrite
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # `ReadLockMode` is used to set the read lock mode for read-write
  # transactions.
  module ReadLockMode
    # Default value.
    #
    # * If isolation level is
    #   {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE SERIALIZABLE},
    #   locking semantics default to `PESSIMISTIC`.
    # * If isolation level is
    #   {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::REPEATABLE_READ REPEATABLE_READ},
    #   locking semantics default to `OPTIMISTIC`.
    # * See
    #   [Concurrency
    #   control](https://cloud.google.com/spanner/docs/concurrency-control)
    #   for more details.
    READ_LOCK_MODE_UNSPECIFIED = 0

    # Pessimistic lock mode.
    #
    # Lock acquisition behavior depends on the isolation level in use. In
    # {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE SERIALIZABLE}
    # isolation, reads and writes acquire necessary locks during transaction
    # statement execution. In
    # {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::REPEATABLE_READ REPEATABLE_READ}
    # isolation, reads that explicitly request to be locked and writes
    # acquire locks.
    # See
    # [Concurrency
    # control](https://cloud.google.com/spanner/docs/concurrency-control) for
    # details on the types of locks acquired at each transaction step.
    PESSIMISTIC = 1

    # Optimistic lock mode.
    #
    # Lock acquisition behavior depends on the isolation level in use. In
    # both
    # {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::SERIALIZABLE SERIALIZABLE}
    # and
    # {::Google::Cloud::Spanner::V1::TransactionOptions::IsolationLevel::REPEATABLE_READ REPEATABLE_READ}
    # isolation, reads and writes do not acquire locks during transaction
    # statement execution.
    # See
    # [Concurrency
    # control](https://cloud.google.com/spanner/docs/concurrency-control) for
    # details on how the guarantees of each isolation level are provided at
    # commit time.
    OPTIMISTIC = 2
  end
end