Class: Google::Cloud::Spanner::V1::SpannerClient

Inherits:

Object

Object
Google::Cloud::Spanner::V1::SpannerClient

show all

Defined in:: lib/google/cloud/spanner/v1/spanner_client.rb

Overview

Cloud Spanner API

The Cloud Spanner API can be used to manage sessions and execute transactions on data stored in Cloud Spanner databases.

Constant Summary collapse

SERVICE_ADDRESS = The default address of the service.

"spanner.googleapis.com".freeze

DEFAULT_SERVICE_PORT = The default port of the service.

DEFAULT_TIMEOUT =

ALL_SCOPES = The scopes needed to make gRPC calls to all of the methods defined in this service.

[
  "https://www.googleapis.com/auth/cloud-platform",
  "https://www.googleapis.com/auth/spanner.data"
].freeze

Instance Attribute Summary collapse

#spanner_stub ⇒ Google::Spanner::V1::Spanner::Stub readonly

Class Method Summary collapse

.database_path(project, instance, database) ⇒ String
Returns a fully-qualified database resource name string.
.match_database_from_database_name(database_name) ⇒ String
Parses the database from a database resource.
.match_database_from_session_name(session_name) ⇒ String
Parses the database from a session resource.
.match_instance_from_database_name(database_name) ⇒ String
Parses the instance from a database resource.
.match_instance_from_session_name(session_name) ⇒ String
Parses the instance from a session resource.
.match_project_from_database_name(database_name) ⇒ String
Parses the project from a database resource.
.match_project_from_session_name(session_name) ⇒ String
Parses the project from a session resource.
.match_session_from_session_name(session_name) ⇒ String
Parses the session from a session resource.
.session_path(project, instance, database, session) ⇒ String
Returns a fully-qualified session resource name string.

Instance Method Summary collapse

#begin_transaction(session, options_, options: nil) ⇒ Google::Spanner::V1::Transaction
Begins a new transaction.
#commit(session, mutations, transaction_id: nil, single_use_transaction: nil, options: nil) ⇒ Google::Spanner::V1::CommitResponse
Commits a transaction.
#create_session(database, options: nil) ⇒ Google::Spanner::V1::Session
Creates a new session.
#delete_session(name, options: nil) ⇒ Object
Ends a session, releasing server resources associated with it.
#execute_sql(session, sql, transaction: nil, params: nil, param_types: nil, resume_token: nil, query_mode: nil, options: nil) ⇒ Google::Spanner::V1::ResultSet
Executes an SQL query, returning all rows in a single reply.
#execute_streaming_sql(session, sql, transaction: nil, params: nil, param_types: nil, resume_token: nil, query_mode: nil, options: nil) ⇒ Enumerable<Google::Spanner::V1::PartialResultSet>
Like ExecuteSql, except returns the result set as a stream.
#get_session(name, options: nil) ⇒ Google::Spanner::V1::Session
Gets a session.
#initialize(service_path: SERVICE_ADDRESS, port: DEFAULT_SERVICE_PORT, channel: nil, chan_creds: nil, scopes: ALL_SCOPES, client_config: {}, timeout: DEFAULT_TIMEOUT, app_name: nil, app_version: nil, lib_name: nil, lib_version: "") ⇒ SpannerClient constructor
A new instance of SpannerClient.
#read(session, table, columns, key_set, transaction: nil, index: nil, limit: nil, resume_token: nil, options: nil) ⇒ Google::Spanner::V1::ResultSet
Reads rows from the database using key lookups and scans, as a simple key/value style alternative to ExecuteSql.
#rollback(session, transaction_id, options: nil) ⇒ Object
Rolls back a transaction, releasing any locks it holds.
#streaming_read(session, table, columns, key_set, transaction: nil, index: nil, limit: nil, resume_token: nil, options: nil) ⇒ Enumerable<Google::Spanner::V1::PartialResultSet>
Like Read, except returns the result set as a stream.

Constructor Details

#initialize(service_path: SERVICE_ADDRESS, port: DEFAULT_SERVICE_PORT, channel: nil, chan_creds: nil, scopes: ALL_SCOPES, client_config: {}, timeout: DEFAULT_TIMEOUT, app_name: nil, app_version: nil, lib_name: nil, lib_version: "") ⇒ `SpannerClient`

Returns a new instance of SpannerClient

Parameters:

service_path (String) —
The domain name of the API remote host.
port (Integer) —
The port on which to connect to the remote host.
channel (Channel) —
A Channel object through which to make calls.
chan_creds (Grpc::ChannelCredentials) —
A ChannelCredentials for the setting up the RPC client.
client_config (Hash) —
A Hash for call options for each method. See Google::Gax#construct_settings for the structure of this data. Falls back to the default config if not specified or the specified config is missing data points.
timeout (Numeric) —
The default timeout, in seconds, for calls made through this client.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 165

def initialize \
    service_path: SERVICE_ADDRESS,
    port: DEFAULT_SERVICE_PORT,
    channel: nil,
    chan_creds: nil,
    scopes: ALL_SCOPES,
    client_config: {},
    timeout: DEFAULT_TIMEOUT,
    app_name: nil,
    app_version: nil,
    lib_name: nil,
    lib_version: ""
  # These require statements are intentionally placed here to initialize
  # the gRPC module only when it's required.
  # See https://github.com/googleapis/toolkit/issues/446
  require "google/gax/grpc"
  require "google/spanner/v1/spanner_services_pb"


  if app_name || app_version
    warn "`app_name` and `app_version` are no longer being used in the request headers."
  end

  google_api_client = "gl-ruby/#{RUBY_VERSION}"
  google_api_client << " #{lib_name}/#{lib_version}" if lib_name
  google_api_client << " gapic/0.6.8 gax/#{Google::Gax::VERSION}"
  google_api_client << " grpc/#{GRPC::VERSION}"
  google_api_client.freeze

  headers = { :"x-goog-api-client" => google_api_client }
  client_config_file = Pathname.new(__dir__).join(
    "spanner_client_config.json"
  )
  defaults = client_config_file.open do |f|
    Google::Gax.construct_settings(
      "google.spanner.v1.Spanner",
      JSON.parse(f.read),
      client_config,
      Google::Gax::Grpc::STATUS_CODE_NAMES,
      timeout,
      errors: Google::Gax::Grpc::API_ERRORS,
      kwargs: headers
    )
  end
  @spanner_stub = Google::Gax::Grpc.create_stub(
    service_path,
    port,
    chan_creds: chan_creds,
    channel: channel,
    scopes: scopes,
    &Google::Spanner::V1::Spanner::Stub.method(:new)
  )

  @create_session = Google::Gax.create_api_call(
    @spanner_stub.method(:create_session),
    defaults["create_session"]
  )
  @get_session = Google::Gax.create_api_call(
    @spanner_stub.method(:get_session),
    defaults["get_session"]
  )
  @delete_session = Google::Gax.create_api_call(
    @spanner_stub.method(:delete_session),
    defaults["delete_session"]
  )
  @execute_sql = Google::Gax.create_api_call(
    @spanner_stub.method(:execute_sql),
    defaults["execute_sql"]
  )
  @execute_streaming_sql = Google::Gax.create_api_call(
    @spanner_stub.method(:execute_streaming_sql),
    defaults["execute_streaming_sql"]
  )
  @read = Google::Gax.create_api_call(
    @spanner_stub.method(:read),
    defaults["read"]
  )
  @streaming_read = Google::Gax.create_api_call(
    @spanner_stub.method(:streaming_read),
    defaults["streaming_read"]
  )
  @begin_transaction = Google::Gax.create_api_call(
    @spanner_stub.method(:begin_transaction),
    defaults["begin_transaction"]
  )
  @commit = Google::Gax.create_api_call(
    @spanner_stub.method(:commit),
    defaults["commit"]
  )
  @rollback = Google::Gax.create_api_call(
    @spanner_stub.method(:rollback),
    defaults["rollback"]
  )
end

Instance Attribute Details

#spanner_stub ⇒ `Google::Spanner::V1::Spanner::Stub` (readonly)

Returns:

(Google::Spanner::V1::Spanner::Stub)

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 43

class SpannerClient
  attr_reader :spanner_stub

  # The default address of the service.
  SERVICE_ADDRESS = "spanner.googleapis.com".freeze

  # The default port of the service.
  DEFAULT_SERVICE_PORT = 443

  DEFAULT_TIMEOUT = 30

  # The scopes needed to make gRPC calls to all of the methods defined in
  # this service.
  ALL_SCOPES = [
    "https://www.googleapis.com/auth/cloud-platform",
    "https://www.googleapis.com/auth/spanner.data"
  ].freeze

  DATABASE_PATH_TEMPLATE = Google::Gax::PathTemplate.new(
    "projects/{project}/instances/{instance}/databases/{database}"
  )

  private_constant :DATABASE_PATH_TEMPLATE

  SESSION_PATH_TEMPLATE = Google::Gax::PathTemplate.new(
    "projects/{project}/instances/{instance}/databases/{database}/sessions/{session}"
  )

  private_constant :SESSION_PATH_TEMPLATE

  # Returns a fully-qualified database resource name string.
  # @param project [String]
  # @param instance [String]
  # @param database [String]
  # @return [String]
  def self.database_path project, instance, database
    DATABASE_PATH_TEMPLATE.render(
      :"project" => project,
      :"instance" => instance,
      :"database" => database
    )
  end

  # Returns a fully-qualified session resource name string.
  # @param project [String]
  # @param instance [String]
  # @param database [String]
  # @param session [String]
  # @return [String]
  def self.session_path project, instance, database, session
    SESSION_PATH_TEMPLATE.render(
      :"project" => project,
      :"instance" => instance,
      :"database" => database,
      :"session" => session
    )
  end

  # Parses the project from a database resource.
  # @param database_name [String]
  # @return [String]
  def self.match_project_from_database_name database_name
    DATABASE_PATH_TEMPLATE.match(database_name)["project"]
  end

  # Parses the instance from a database resource.
  # @param database_name [String]
  # @return [String]
  def self.match_instance_from_database_name database_name
    DATABASE_PATH_TEMPLATE.match(database_name)["instance"]
  end

  # Parses the database from a database resource.
  # @param database_name [String]
  # @return [String]
  def self.match_database_from_database_name database_name
    DATABASE_PATH_TEMPLATE.match(database_name)["database"]
  end

  # Parses the project from a session resource.
  # @param session_name [String]
  # @return [String]
  def self.match_project_from_session_name session_name
    SESSION_PATH_TEMPLATE.match(session_name)["project"]
  end

  # Parses the instance from a session resource.
  # @param session_name [String]
  # @return [String]
  def self.match_instance_from_session_name session_name
    SESSION_PATH_TEMPLATE.match(session_name)["instance"]
  end

  # Parses the database from a session resource.
  # @param session_name [String]
  # @return [String]
  def self.match_database_from_session_name session_name
    SESSION_PATH_TEMPLATE.match(session_name)["database"]
  end

  # Parses the session from a session resource.
  # @param session_name [String]
  # @return [String]
  def self.match_session_from_session_name session_name
    SESSION_PATH_TEMPLATE.match(session_name)["session"]
  end

  # @param service_path [String]
  #   The domain name of the API remote host.
  # @param port [Integer]
  #   The port on which to connect to the remote host.
  # @param channel [Channel]
  #   A Channel object through which to make calls.
  # @param chan_creds [Grpc::ChannelCredentials]
  #   A ChannelCredentials for the setting up the RPC client.
  # @param client_config[Hash]
  #   A Hash for call options for each method. See
  #   Google::Gax#construct_settings for the structure of
  #   this data. Falls back to the default config if not specified
  #   or the specified config is missing data points.
  # @param timeout [Numeric]
  #   The default timeout, in seconds, for calls made through this client.
  def initialize \
      service_path: SERVICE_ADDRESS,
      port: DEFAULT_SERVICE_PORT,
      channel: nil,
      chan_creds: nil,
      scopes: ALL_SCOPES,
      client_config: {},
      timeout: DEFAULT_TIMEOUT,
      app_name: nil,
      app_version: nil,
      lib_name: nil,
      lib_version: ""
    # These require statements are intentionally placed here to initialize
    # the gRPC module only when it's required.
    # See https://github.com/googleapis/toolkit/issues/446
    require "google/gax/grpc"
    require "google/spanner/v1/spanner_services_pb"


    if app_name || app_version
      warn "`app_name` and `app_version` are no longer being used in the request headers."
    end

    google_api_client = "gl-ruby/#{RUBY_VERSION}"
    google_api_client << " #{lib_name}/#{lib_version}" if lib_name
    google_api_client << " gapic/0.6.8 gax/#{Google::Gax::VERSION}"
    google_api_client << " grpc/#{GRPC::VERSION}"
    google_api_client.freeze

    headers = { :"x-goog-api-client" => google_api_client }
    client_config_file = Pathname.new(__dir__).join(
      "spanner_client_config.json"
    )
    defaults = client_config_file.open do |f|
      Google::Gax.construct_settings(
        "google.spanner.v1.Spanner",
        JSON.parse(f.read),
        client_config,
        Google::Gax::Grpc::STATUS_CODE_NAMES,
        timeout,
        errors: Google::Gax::Grpc::API_ERRORS,
        kwargs: headers
      )
    end
    @spanner_stub = Google::Gax::Grpc.create_stub(
      service_path,
      port,
      chan_creds: chan_creds,
      channel: channel,
      scopes: scopes,
      &Google::Spanner::V1::Spanner::Stub.method(:new)
    )

    @create_session = Google::Gax.create_api_call(
      @spanner_stub.method(:create_session),
      defaults["create_session"]
    )
    @get_session = Google::Gax.create_api_call(
      @spanner_stub.method(:get_session),
      defaults["get_session"]
    )
    @delete_session = Google::Gax.create_api_call(
      @spanner_stub.method(:delete_session),
      defaults["delete_session"]
    )
    @execute_sql = Google::Gax.create_api_call(
      @spanner_stub.method(:execute_sql),
      defaults["execute_sql"]
    )
    @execute_streaming_sql = Google::Gax.create_api_call(
      @spanner_stub.method(:execute_streaming_sql),
      defaults["execute_streaming_sql"]
    )
    @read = Google::Gax.create_api_call(
      @spanner_stub.method(:read),
      defaults["read"]
    )
    @streaming_read = Google::Gax.create_api_call(
      @spanner_stub.method(:streaming_read),
      defaults["streaming_read"]
    )
    @begin_transaction = Google::Gax.create_api_call(
      @spanner_stub.method(:begin_transaction),
      defaults["begin_transaction"]
    )
    @commit = Google::Gax.create_api_call(
      @spanner_stub.method(:commit),
      defaults["commit"]
    )
    @rollback = Google::Gax.create_api_call(
      @spanner_stub.method(:rollback),
      defaults["rollback"]
    )
  end

  # Service calls

  # 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.
  #
  # Cloud Spanner limits the number of sessions that can exist at any given
  # time; thus, it is a good idea to delete idle and/or unneeded sessions.
  # Aside from explicit deletes, Cloud Spanner can 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"+.
  #
  # @param database [String]
  #   Required. The database in which the new session is created.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @return [Google::Spanner::V1::Session]
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #
  #   spanner_client = SpannerClient.new
  #   formatted_database = SpannerClient.database_path("[PROJECT]", "[INSTANCE]", "[DATABASE]")
  #   response = spanner_client.create_session(formatted_database)

  def create_session \
      database,
      options: nil
    req = Google::Spanner::V1::CreateSessionRequest.new({
      database: database
    }.delete_if { |_, v| v.nil? })
    @create_session.call(req, options)
  end

  # Gets a session. Returns +NOT_FOUND+ if the session does not exist.
  # This is mainly useful for determining whether a session is still
  # alive.
  #
  # @param name [String]
  #   Required. The name of the session to retrieve.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @return [Google::Spanner::V1::Session]
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #
  #   spanner_client = SpannerClient.new
  #   formatted_name = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
  #   response = spanner_client.get_session(formatted_name)

  def get_session \
      name,
      options: nil
    req = Google::Spanner::V1::GetSessionRequest.new({
      name: name
    }.delete_if { |_, v| v.nil? })
    @get_session.call(req, options)
  end

  # Ends a session, releasing server resources associated with it.
  #
  # @param name [String]
  #   Required. The name of the session to delete.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #
  #   spanner_client = SpannerClient.new
  #   formatted_name = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
  #   spanner_client.delete_session(formatted_name)

  def delete_session \
      name,
      options: nil
    req = Google::Spanner::V1::DeleteSessionRequest.new({
      name: name
    }.delete_if { |_, v| v.nil? })
    @delete_session.call(req, options)
    nil
  end

  # Executes an SQL query, returning all rows 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.
  #
  # Queries 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.
  #
  # @param session [String]
  #   Required. The session in which the SQL query should be performed.
  # @param sql [String]
  #   Required. The SQL query string.
  # @param transaction [Google::Spanner::V1::TransactionSelector]
  #   The transaction to use. If none is provided, the default is a
  #   temporary read-only transaction with strong concurrency.
  # @param params [Google::Protobuf::Struct]
  #   The SQL query string can contain parameter placeholders. A parameter
  #   placeholder consists of +'@'+ followed by the parameter
  #   name. Parameter names consist of any combination of letters,
  #   numbers, and underscores.
  #
  #   Parameters can appear anywhere that a literal value is expected.  The same
  #   parameter name can be used more than once, for example:
  #     +"WHERE id > @msg_id AND id < @msg_id + 100"+
  #
  #   It is an error to execute an SQL query with unbound parameters.
  #
  #   Parameter values are specified using +params+, which is a JSON
  #   object whose keys are parameter names, and whose values are the
  #   corresponding parameter values.
  # @param param_types [Hash{String => Google::Spanner::V1::Type}]
  #   It is not always possible for Cloud Spanner to infer the right SQL type
  #   from a JSON value.  For example, values of type +BYTES+ and values
  #   of type +STRING+ both appear in Params as JSON strings.
  #
  #   In these cases, +param_types+ can be used to specify the exact
  #   SQL type for some or all of the SQL query parameters. See the
  #   definition of Type for more information
  #   about SQL types.
  # @param resume_token [String]
  #   If this request is resuming a previously interrupted SQL query
  #   execution, +resume_token+ should be copied from the last
  #   PartialResultSet yielded before the interruption. Doing this
  #   enables the new SQL query execution to resume where the last one left
  #   off. The rest of the request parameters must exactly match the
  #   request that yielded this token.
  # @param query_mode [Google::Spanner::V1::ExecuteSqlRequest::QueryMode]
  #   Used to control the amount of debugging information returned in
  #   ResultSetStats.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @return [Google::Spanner::V1::ResultSet]
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #
  #   spanner_client = SpannerClient.new
  #   formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
  #   sql = ''
  #   response = spanner_client.execute_sql(formatted_session, sql)

  def execute_sql \
      session,
      sql,
      transaction: nil,
      params: nil,
      param_types: nil,
      resume_token: nil,
      query_mode: nil,
      options: nil
    req = Google::Spanner::V1::ExecuteSqlRequest.new({
      session: session,
      sql: sql,
      transaction: transaction,
      params: params,
      param_types: param_types,
      resume_token: resume_token,
      query_mode: query_mode
    }.delete_if { |_, v| v.nil? })
    @execute_sql.call(req, options)
  end

  # 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.
  #
  # @param session [String]
  #   Required. The session in which the SQL query should be performed.
  # @param sql [String]
  #   Required. The SQL query string.
  # @param transaction [Google::Spanner::V1::TransactionSelector]
  #   The transaction to use. If none is provided, the default is a
  #   temporary read-only transaction with strong concurrency.
  # @param params [Google::Protobuf::Struct]
  #   The SQL query string can contain parameter placeholders. A parameter
  #   placeholder consists of +'@'+ followed by the parameter
  #   name. Parameter names consist of any combination of letters,
  #   numbers, and underscores.
  #
  #   Parameters can appear anywhere that a literal value is expected.  The same
  #   parameter name can be used more than once, for example:
  #     +"WHERE id > @msg_id AND id < @msg_id + 100"+
  #
  #   It is an error to execute an SQL query with unbound parameters.
  #
  #   Parameter values are specified using +params+, which is a JSON
  #   object whose keys are parameter names, and whose values are the
  #   corresponding parameter values.
  # @param param_types [Hash{String => Google::Spanner::V1::Type}]
  #   It is not always possible for Cloud Spanner to infer the right SQL type
  #   from a JSON value.  For example, values of type +BYTES+ and values
  #   of type +STRING+ both appear in Params as JSON strings.
  #
  #   In these cases, +param_types+ can be used to specify the exact
  #   SQL type for some or all of the SQL query parameters. See the
  #   definition of Type for more information
  #   about SQL types.
  # @param resume_token [String]
  #   If this request is resuming a previously interrupted SQL query
  #   execution, +resume_token+ should be copied from the last
  #   PartialResultSet yielded before the interruption. Doing this
  #   enables the new SQL query execution to resume where the last one left
  #   off. The rest of the request parameters must exactly match the
  #   request that yielded this token.
  # @param query_mode [Google::Spanner::V1::ExecuteSqlRequest::QueryMode]
  #   Used to control the amount of debugging information returned in
  #   ResultSetStats.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @return [Enumerable<Google::Spanner::V1::PartialResultSet>]
  #   An enumerable of Google::Spanner::V1::PartialResultSet instances.
  #
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #
  #   spanner_client = SpannerClient.new
  #   formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
  #   sql = ''
  #   spanner_client.execute_streaming_sql(formatted_session, sql).each do |element|
  #     # Process element.
  #   end

  def execute_streaming_sql \
      session,
      sql,
      transaction: nil,
      params: nil,
      param_types: nil,
      resume_token: nil,
      query_mode: nil,
      options: nil
    req = Google::Spanner::V1::ExecuteSqlRequest.new({
      session: session,
      sql: sql,
      transaction: transaction,
      params: params,
      param_types: param_types,
      resume_token: resume_token,
      query_mode: query_mode
    }.delete_if { |_, v| v.nil? })
    @execute_streaming_sql.call(req, options)
  end

  # 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.
  #
  # @param session [String]
  #   Required. The session in which the read should be performed.
  # @param table [String]
  #   Required. The name of the table in the database to be read.
  # @param columns [Array<String>]
  #   The columns of Table to be returned for each row matching
  #   this request.
  # @param key_set [Google::Spanner::V1::KeySet]
  #   Required. +key_set+ identifies the rows to be yielded. +key_set+ names the
  #   primary keys of the rows in Table to be yielded, unless Index
  #   is present. If Index is present, then Key_set instead names
  #   index keys in Index.
  #
  #   Rows are yielded in table primary key order (if Index is empty)
  #   or index key order (if Index is non-empty).
  #
  #   It is not an error for the +key_set+ to name rows that do not
  #   exist in the database. Read yields nothing for nonexistent rows.
  # @param transaction [Google::Spanner::V1::TransactionSelector]
  #   The transaction to use. If none is provided, the default is a
  #   temporary read-only transaction with strong concurrency.
  # @param index [String]
  #   If non-empty, the name of an index on Table. This index is
  #   used instead of the table primary key when interpreting Key_set
  #   and sorting result rows. See Key_set for further information.
  # @param limit [Integer]
  #   If greater than zero, only the first +limit+ rows are yielded. If +limit+
  #   is zero, the default is no limit.
  # @param resume_token [String]
  #   If this request is resuming a previously interrupted read,
  #   +resume_token+ should be copied from the last
  #   PartialResultSet yielded before the interruption. Doing this
  #   enables the new read to resume where the last read left off. The
  #   rest of the request parameters must exactly match the request
  #   that yielded this token.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @return [Google::Spanner::V1::ResultSet]
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   KeySet = Google::Spanner::V1::KeySet
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #
  #   spanner_client = SpannerClient.new
  #   formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
  #   table = ''
  #   columns = []
  #   key_set = KeySet.new
  #   response = spanner_client.read(formatted_session, table, columns, key_set)

  def read \
      session,
      table,
      columns,
      key_set,
      transaction: nil,
      index: nil,
      limit: nil,
      resume_token: nil,
      options: nil
    req = Google::Spanner::V1::ReadRequest.new({
      session: session,
      table: table,
      columns: columns,
      key_set: key_set,
      transaction: transaction,
      index: index,
      limit: limit,
      resume_token: resume_token
    }.delete_if { |_, v| v.nil? })
    @read.call(req, options)
  end

  # 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.
  #
  # @param session [String]
  #   Required. The session in which the read should be performed.
  # @param table [String]
  #   Required. The name of the table in the database to be read.
  # @param columns [Array<String>]
  #   The columns of Table to be returned for each row matching
  #   this request.
  # @param key_set [Google::Spanner::V1::KeySet]
  #   Required. +key_set+ identifies the rows to be yielded. +key_set+ names the
  #   primary keys of the rows in Table to be yielded, unless Index
  #   is present. If Index is present, then Key_set instead names
  #   index keys in Index.
  #
  #   Rows are yielded in table primary key order (if Index is empty)
  #   or index key order (if Index is non-empty).
  #
  #   It is not an error for the +key_set+ to name rows that do not
  #   exist in the database. Read yields nothing for nonexistent rows.
  # @param transaction [Google::Spanner::V1::TransactionSelector]
  #   The transaction to use. If none is provided, the default is a
  #   temporary read-only transaction with strong concurrency.
  # @param index [String]
  #   If non-empty, the name of an index on Table. This index is
  #   used instead of the table primary key when interpreting Key_set
  #   and sorting result rows. See Key_set for further information.
  # @param limit [Integer]
  #   If greater than zero, only the first +limit+ rows are yielded. If +limit+
  #   is zero, the default is no limit.
  # @param resume_token [String]
  #   If this request is resuming a previously interrupted read,
  #   +resume_token+ should be copied from the last
  #   PartialResultSet yielded before the interruption. Doing this
  #   enables the new read to resume where the last read left off. The
  #   rest of the request parameters must exactly match the request
  #   that yielded this token.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @return [Enumerable<Google::Spanner::V1::PartialResultSet>]
  #   An enumerable of Google::Spanner::V1::PartialResultSet instances.
  #
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   KeySet = Google::Spanner::V1::KeySet
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #
  #   spanner_client = SpannerClient.new
  #   formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
  #   table = ''
  #   columns = []
  #   key_set = KeySet.new
  #   spanner_client.streaming_read(formatted_session, table, columns, key_set).each do |element|
  #     # Process element.
  #   end

  def streaming_read \
      session,
      table,
      columns,
      key_set,
      transaction: nil,
      index: nil,
      limit: nil,
      resume_token: nil,
      options: nil
    req = Google::Spanner::V1::ReadRequest.new({
      session: session,
      table: table,
      columns: columns,
      key_set: key_set,
      transaction: transaction,
      index: index,
      limit: limit,
      resume_token: resume_token
    }.delete_if { |_, v| v.nil? })
    @streaming_read.call(req, options)
  end

  # Begins a new transaction. This step can often be skipped:
  # Read, ExecuteSql and
  # Commit can begin a new transaction as a
  # side-effect.
  #
  # @param session [String]
  #   Required. The session in which the transaction runs.
  # @param options_ [Google::Spanner::V1::TransactionOptions]
  #   Required. Options for the new transaction.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @return [Google::Spanner::V1::Transaction]
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #   TransactionOptions = Google::Spanner::V1::TransactionOptions
  #
  #   spanner_client = SpannerClient.new
  #   formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
  #   options_ = TransactionOptions.new
  #   response = spanner_client.begin_transaction(formatted_session, options_)

  def begin_transaction \
      session,
      options_,
      options: nil
    req = Google::Spanner::V1::BeginTransactionRequest.new({
      session: session,
      options: options_
    }.delete_if { |_, v| v.nil? })
    @begin_transaction.call(req, options)
  end

  # 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.
  #
  # @param session [String]
  #   Required. The session in which the transaction to be committed is running.
  # @param mutations [Array<Google::Spanner::V1::Mutation>]
  #   The mutations to be executed when this transaction commits. All
  #   mutations are applied atomically, in the order they appear in
  #   this list.
  # @param transaction_id [String]
  #   Commit a previously-started transaction.
  # @param single_use_transaction [Google::Spanner::V1::TransactionOptions]
  #   Execute mutations in a temporary transaction. Note that unlike
  #   commit of a previously-started transaction, commit with a
  #   temporary transaction is non-idempotent. That is, if the
  #   +CommitRequest+ is sent to Cloud Spanner more than once (for
  #   instance, due to retries in the application, or in the
  #   transport library), it is possible that the mutations are
  #   executed more than once. If this is undesirable, use
  #   BeginTransaction and
  #   Commit instead.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @return [Google::Spanner::V1::CommitResponse]
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #
  #   spanner_client = SpannerClient.new
  #   formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
  #   mutations = []
  #   response = spanner_client.commit(formatted_session, mutations)

  def commit \
      session,
      mutations,
      transaction_id: nil,
      single_use_transaction: nil,
      options: nil
    req = Google::Spanner::V1::CommitRequest.new({
      session: session,
      mutations: mutations,
      transaction_id: transaction_id,
      single_use_transaction: single_use_transaction
    }.delete_if { |_, v| v.nil? })
    @commit.call(req, options)
  end

  # 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+.
  #
  # @param session [String]
  #   Required. The session in which the transaction to roll back is running.
  # @param transaction_id [String]
  #   Required. The transaction to roll back.
  # @param options [Google::Gax::CallOptions]
  #   Overrides the default settings for this call, e.g, timeout,
  #   retries, etc.
  # @raise [Google::Gax::GaxError] if the RPC is aborted.
  # @example
  #   require "google/cloud/spanner/v1/spanner_client"
  #
  #   SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
  #
  #   spanner_client = SpannerClient.new
  #   formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
  #   transaction_id = ''
  #   spanner_client.rollback(formatted_session, transaction_id)

  def rollback \
      session,
      transaction_id,
      options: nil
    req = Google::Spanner::V1::RollbackRequest.new({
      session: session,
      transaction_id: transaction_id
    }.delete_if { |_, v| v.nil? })
    @rollback.call(req, options)
    nil
  end
end

Class Method Details

.database_path(project, instance, database) ⇒ `String`

Returns a fully-qualified database resource name string.

Parameters:

project (String)
instance (String)
database (String)

Returns:

(String)

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 78

def self.database_path project, instance, database
  DATABASE_PATH_TEMPLATE.render(
    :"project" => project,
    :"instance" => instance,
    :"database" => database
  )
end

.match_database_from_database_name(database_name) ⇒ `String`

Parses the database from a database resource.

Parameters:

database_name (String)

Returns:

(String)



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# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 118

def self.match_database_from_database_name database_name
  DATABASE_PATH_TEMPLATE.match(database_name)["database"]
end

.match_database_from_session_name(session_name) ⇒ `String`

Parses the database from a session resource.

Parameters:

session_name (String)

Returns:

(String)



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# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 139

def self.match_database_from_session_name session_name
  SESSION_PATH_TEMPLATE.match(session_name)["database"]
end

.match_instance_from_database_name(database_name) ⇒ `String`

Parses the instance from a database resource.

Parameters:

database_name (String)

Returns:

(String)



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# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 111

def self.match_instance_from_database_name database_name
  DATABASE_PATH_TEMPLATE.match(database_name)["instance"]
end

.match_instance_from_session_name(session_name) ⇒ `String`

Parses the instance from a session resource.

Parameters:

session_name (String)

Returns:

(String)



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# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 132

def self.match_instance_from_session_name session_name
  SESSION_PATH_TEMPLATE.match(session_name)["instance"]
end

.match_project_from_database_name(database_name) ⇒ `String`

Parses the project from a database resource.

Parameters:

database_name (String)

Returns:

(String)



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# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 104

def self.match_project_from_database_name database_name
  DATABASE_PATH_TEMPLATE.match(database_name)["project"]
end

.match_project_from_session_name(session_name) ⇒ `String`

Parses the project from a session resource.

Parameters:

session_name (String)

Returns:

(String)



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# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 125

def self.match_project_from_session_name session_name
  SESSION_PATH_TEMPLATE.match(session_name)["project"]
end

.match_session_from_session_name(session_name) ⇒ `String`

Parses the session from a session resource.

Parameters:

session_name (String)

Returns:

(String)



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# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 146

def self.match_session_from_session_name session_name
  SESSION_PATH_TEMPLATE.match(session_name)["session"]
end

.session_path(project, instance, database, session) ⇒ `String`

Returns a fully-qualified session resource name string.

Parameters:

project (String)
instance (String)
database (String)
session (String)

Returns:

(String)

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 92

def self.session_path project, instance, database, session
  SESSION_PATH_TEMPLATE.render(
    :"project" => project,
    :"instance" => instance,
    :"database" => database,
    :"session" => session
  )
end

Instance Method Details

#begin_transaction(session, options_, options: nil) ⇒ `Google::Spanner::V1::Transaction`

Begins a new transaction. This step can often be skipped: Read, ExecuteSql and Commit can begin a new transaction as a side-effect.

Examples:

require "google/cloud/spanner/v1/spanner_client"

SpannerClient = Google::Cloud::Spanner::V1::SpannerClient
TransactionOptions = Google::Spanner::V1::TransactionOptions

spanner_client = SpannerClient.new
formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
options_ = TransactionOptions.new
response = spanner_client.begin_transaction(formatted_session, options_)

Parameters:

session (String) —
Required. The session in which the transaction runs.
options_ (Google::Spanner::V1::TransactionOptions) —
Required. Options for the new transaction.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Returns:

(Google::Spanner::V1::Transaction)

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 740

def begin_transaction \
    session,
    options_,
    options: nil
  req = Google::Spanner::V1::BeginTransactionRequest.new({
    session: session,
    options: options_
  }.delete_if { |_, v| v.nil? })
  @begin_transaction.call(req, options)
end

#commit(session, mutations, transaction_id: nil, single_use_transaction: nil, options: nil) ⇒ `Google::Spanner::V1::CommitResponse`

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.

Examples:

require "google/cloud/spanner/v1/spanner_client"

SpannerClient = Google::Cloud::Spanner::V1::SpannerClient

spanner_client = SpannerClient.new
formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
mutations = []
response = spanner_client.commit(formatted_session, mutations)

Parameters:

session (String) —
Required. The session in which the transaction to be committed is running.
mutations (Array<Google::Spanner::V1::Mutation>) —
The mutations to be executed when this transaction commits. All mutations are applied atomically, in the order they appear in this list.
transaction_id (String) —
Commit a previously-started transaction.
single_use_transaction (Google::Spanner::V1::TransactionOptions) —
Execute mutations in a temporary transaction. Note that unlike commit of a previously-started transaction, commit with a temporary transaction is non-idempotent. That is, if the +CommitRequest+ is sent to Cloud Spanner more than once (for instance, due to retries in the application, or in the transport library), it is possible that the mutations are executed more than once. If this is undesirable, use BeginTransaction and Commit instead.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Returns:

(Google::Spanner::V1::CommitResponse)

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 793

def commit \
    session,
    mutations,
    transaction_id: nil,
    single_use_transaction: nil,
    options: nil
  req = Google::Spanner::V1::CommitRequest.new({
    session: session,
    mutations: mutations,
    transaction_id: transaction_id,
    single_use_transaction: single_use_transaction
  }.delete_if { |_, v| v.nil? })
  @commit.call(req, options)
end

#create_session(database, options: nil) ⇒ `Google::Spanner::V1::Session`

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.

Cloud Spanner limits the number of sessions that can exist at any given time; thus, it is a good idea to delete idle and/or unneeded sessions. Aside from explicit deletes, Cloud Spanner can 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"+.

Examples:

require "google/cloud/spanner/v1/spanner_client"

SpannerClient = Google::Cloud::Spanner::V1::SpannerClient

spanner_client = SpannerClient.new
formatted_database = SpannerClient.database_path("[PROJECT]", "[INSTANCE]", "[DATABASE]")
response = spanner_client.create_session(formatted_database)

Parameters:

database (String) —
Required. The database in which the new session is created.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Returns:

(Google::Spanner::V1::Session)

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 298

def create_session \
    database,
    options: nil
  req = Google::Spanner::V1::CreateSessionRequest.new({
    database: database
  }.delete_if { |_, v| v.nil? })
  @create_session.call(req, options)
end

#delete_session(name, options: nil) ⇒ `Object`

Ends a session, releasing server resources associated with it.

Examples:

require "google/cloud/spanner/v1/spanner_client"

SpannerClient = Google::Cloud::Spanner::V1::SpannerClient

spanner_client = SpannerClient.new
formatted_name = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
spanner_client.delete_session(formatted_name)

Parameters:

name (String) —
Required. The name of the session to delete.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 353

def delete_session \
    name,
    options: nil
  req = Google::Spanner::V1::DeleteSessionRequest.new({
    name: name
  }.delete_if { |_, v| v.nil? })
  @delete_session.call(req, options)
  nil
end

#execute_sql(session, sql, transaction: nil, params: nil, param_types: nil, resume_token: nil, query_mode: nil, options: nil) ⇒ `Google::Spanner::V1::ResultSet`

Executes an SQL query, returning all rows 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.

Queries 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.

Examples:

require "google/cloud/spanner/v1/spanner_client"

SpannerClient = Google::Cloud::Spanner::V1::SpannerClient

spanner_client = SpannerClient.new
formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
sql = ''
response = spanner_client.execute_sql(formatted_session, sql)

Parameters:

session (String) —
Required. The session in which the SQL query should be performed.
sql (String) —
Required. The SQL query string.
transaction (Google::Spanner::V1::TransactionSelector) —
The transaction to use. If none is provided, the default is a temporary read-only transaction with strong concurrency.
params (Google::Protobuf::Struct) —
The SQL query string can contain parameter placeholders. A parameter placeholder consists of +'@'+ followed by the parameter name. Parameter names consist of any combination of letters, numbers, and underscores.

Parameters can appear anywhere that a literal value is expected. The same parameter name can be used more than once, for example: +"WHERE id > @msg_id AND id < @msg_id + 100"+

It is an error to execute an SQL query with unbound parameters.

Parameter values are specified using +params+, which is a JSON object whose keys are parameter names, and whose values are the corresponding parameter values.
param_types (Hash{String => Google::Spanner::V1::Type}) —
It is not always possible for Cloud Spanner to infer the right SQL type from a JSON value. For example, values of type +BYTES+ and values of type +STRING+ both appear in Params as JSON strings.

In these cases, +param_types+ can be used to specify the exact SQL type for some or all of the SQL query parameters. See the definition of Type for more information about SQL types.
resume_token (String) —
If this request is resuming a previously interrupted SQL query execution, +resume_token+ should be copied from the last PartialResultSet yielded before the interruption. Doing this enables the new SQL query execution to resume where the last one left off. The rest of the request parameters must exactly match the request that yielded this token.
query_mode (Google::Spanner::V1::ExecuteSqlRequest::QueryMode) —
Used to control the amount of debugging information returned in ResultSetStats.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Returns:

(Google::Spanner::V1::ResultSet)

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 431

def execute_sql \
    session,
    sql,
    transaction: nil,
    params: nil,
    param_types: nil,
    resume_token: nil,
    query_mode: nil,
    options: nil
  req = Google::Spanner::V1::ExecuteSqlRequest.new({
    session: session,
    sql: sql,
    transaction: transaction,
    params: params,
    param_types: param_types,
    resume_token: resume_token,
    query_mode: query_mode
  }.delete_if { |_, v| v.nil? })
  @execute_sql.call(req, options)
end

#execute_streaming_sql(session, sql, transaction: nil, params: nil, param_types: nil, resume_token: nil, query_mode: nil, options: nil) ⇒ `Enumerable<Google::Spanner::V1::PartialResultSet>`

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.

Examples:

require "google/cloud/spanner/v1/spanner_client"

SpannerClient = Google::Cloud::Spanner::V1::SpannerClient

spanner_client = SpannerClient.new
formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
sql = ''
spanner_client.execute_streaming_sql(formatted_session, sql).each do |element|
  # Process element.
end

Parameters:

session (String) —
Required. The session in which the SQL query should be performed.
sql (String) —
Required. The SQL query string.
transaction (Google::Spanner::V1::TransactionSelector) —
The transaction to use. If none is provided, the default is a temporary read-only transaction with strong concurrency.
params (Google::Protobuf::Struct) —
The SQL query string can contain parameter placeholders. A parameter placeholder consists of +'@'+ followed by the parameter name. Parameter names consist of any combination of letters, numbers, and underscores.

Parameters can appear anywhere that a literal value is expected. The same parameter name can be used more than once, for example: +"WHERE id > @msg_id AND id < @msg_id + 100"+

It is an error to execute an SQL query with unbound parameters.

Parameter values are specified using +params+, which is a JSON object whose keys are parameter names, and whose values are the corresponding parameter values.
param_types (Hash{String => Google::Spanner::V1::Type}) —
It is not always possible for Cloud Spanner to infer the right SQL type from a JSON value. For example, values of type +BYTES+ and values of type +STRING+ both appear in Params as JSON strings.

In these cases, +param_types+ can be used to specify the exact SQL type for some or all of the SQL query parameters. See the definition of Type for more information about SQL types.
resume_token (String) —
If this request is resuming a previously interrupted SQL query execution, +resume_token+ should be copied from the last PartialResultSet yielded before the interruption. Doing this enables the new SQL query execution to resume where the last one left off. The rest of the request parameters must exactly match the request that yielded this token.
query_mode (Google::Spanner::V1::ExecuteSqlRequest::QueryMode) —
Used to control the amount of debugging information returned in ResultSetStats.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Returns:

(Enumerable<Google::Spanner::V1::PartialResultSet>) —
An enumerable of Google::Spanner::V1::PartialResultSet instances.

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 518

def execute_streaming_sql \
    session,
    sql,
    transaction: nil,
    params: nil,
    param_types: nil,
    resume_token: nil,
    query_mode: nil,
    options: nil
  req = Google::Spanner::V1::ExecuteSqlRequest.new({
    session: session,
    sql: sql,
    transaction: transaction,
    params: params,
    param_types: param_types,
    resume_token: resume_token,
    query_mode: query_mode
  }.delete_if { |_, v| v.nil? })
  @execute_streaming_sql.call(req, options)
end

#get_session(name, options: nil) ⇒ `Google::Spanner::V1::Session`

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

Examples:

require "google/cloud/spanner/v1/spanner_client"

SpannerClient = Google::Cloud::Spanner::V1::SpannerClient

spanner_client = SpannerClient.new
formatted_name = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
response = spanner_client.get_session(formatted_name)

Parameters:

name (String) —
Required. The name of the session to retrieve.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Returns:

(Google::Spanner::V1::Session)

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 327

def get_session \
    name,
    options: nil
  req = Google::Spanner::V1::GetSessionRequest.new({
    name: name
  }.delete_if { |_, v| v.nil? })
  @get_session.call(req, options)
end

#read(session, table, columns, key_set, transaction: nil, index: nil, limit: nil, resume_token: nil, options: nil) ⇒ `Google::Spanner::V1::ResultSet`

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.

Examples:

require "google/cloud/spanner/v1/spanner_client"

KeySet = Google::Spanner::V1::KeySet
SpannerClient = Google::Cloud::Spanner::V1::SpannerClient

spanner_client = SpannerClient.new
formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
table = ''
columns = []
key_set = KeySet.new
response = spanner_client.read(formatted_session, table, columns, key_set)

Parameters:

session (String) —
Required. The session in which the read should be performed.
table (String) —
Required. The name of the table in the database to be read.
columns (Array<String>) —
The columns of Table to be returned for each row matching this request.
key_set (Google::Spanner::V1::KeySet) —
Required. +key_set+ identifies the rows to be yielded. +key_set+ names the primary keys of the rows in Table to be yielded, unless Index is present. If Index is present, then Key_set instead names index keys in Index.

Rows are yielded in table primary key order (if Index is empty) or index key order (if Index is non-empty).

It is not an error for the +key_set+ to name rows that do not exist in the database. Read yields nothing for nonexistent rows.
transaction (Google::Spanner::V1::TransactionSelector) —
The transaction to use. If none is provided, the default is a temporary read-only transaction with strong concurrency.
index (String) —
If non-empty, the name of an index on Table. This index is used instead of the table primary key when interpreting Key_set and sorting result rows. See Key_set for further information.
limit (Integer) —
If greater than zero, only the first +limit+ rows are yielded. If +limit+ is zero, the default is no limit.
resume_token (String) —
If this request is resuming a previously interrupted read, +resume_token+ should be copied from the last PartialResultSet yielded before the interruption. Doing this enables the new read to resume where the last read left off. The rest of the request parameters must exactly match the request that yielded this token.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Returns:

(Google::Spanner::V1::ResultSet)

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 606

def read \
    session,
    table,
    columns,
    key_set,
    transaction: nil,
    index: nil,
    limit: nil,
    resume_token: nil,
    options: nil
  req = Google::Spanner::V1::ReadRequest.new({
    session: session,
    table: table,
    columns: columns,
    key_set: key_set,
    transaction: transaction,
    index: index,
    limit: limit,
    resume_token: resume_token
  }.delete_if { |_, v| v.nil? })
  @read.call(req, options)
end

#rollback(session, transaction_id, options: nil) ⇒ `Object`

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+.

Examples:

require "google/cloud/spanner/v1/spanner_client"

SpannerClient = Google::Cloud::Spanner::V1::SpannerClient

spanner_client = SpannerClient.new
formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
transaction_id = ''
spanner_client.rollback(formatted_session, transaction_id)

Parameters:

session (String) —
Required. The session in which the transaction to roll back is running.
transaction_id (String) —
Required. The transaction to roll back.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 835

def rollback \
    session,
    transaction_id,
    options: nil
  req = Google::Spanner::V1::RollbackRequest.new({
    session: session,
    transaction_id: transaction_id
  }.delete_if { |_, v| v.nil? })
  @rollback.call(req, options)
  nil
end

#streaming_read(session, table, columns, key_set, transaction: nil, index: nil, limit: nil, resume_token: nil, options: nil) ⇒ `Enumerable<Google::Spanner::V1::PartialResultSet>`

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.

Examples:

require "google/cloud/spanner/v1/spanner_client"

KeySet = Google::Spanner::V1::KeySet
SpannerClient = Google::Cloud::Spanner::V1::SpannerClient

spanner_client = SpannerClient.new
formatted_session = SpannerClient.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]")
table = ''
columns = []
key_set = KeySet.new
spanner_client.streaming_read(formatted_session, table, columns, key_set).each do |element|
  # Process element.
end

Parameters:

session (String) —
Required. The session in which the read should be performed.
table (String) —
Required. The name of the table in the database to be read.
columns (Array<String>) —
The columns of Table to be returned for each row matching this request.
key_set (Google::Spanner::V1::KeySet) —
Required. +key_set+ identifies the rows to be yielded. +key_set+ names the primary keys of the rows in Table to be yielded, unless Index is present. If Index is present, then Key_set instead names index keys in Index.

Rows are yielded in table primary key order (if Index is empty) or index key order (if Index is non-empty).

It is not an error for the +key_set+ to name rows that do not exist in the database. Read yields nothing for nonexistent rows.
transaction (Google::Spanner::V1::TransactionSelector) —
The transaction to use. If none is provided, the default is a temporary read-only transaction with strong concurrency.
index (String) —
If non-empty, the name of an index on Table. This index is used instead of the table primary key when interpreting Key_set and sorting result rows. See Key_set for further information.
limit (Integer) —
If greater than zero, only the first +limit+ rows are yielded. If +limit+ is zero, the default is no limit.
resume_token (String) —
If this request is resuming a previously interrupted read, +resume_token+ should be copied from the last PartialResultSet yielded before the interruption. Doing this enables the new read to resume where the last read left off. The rest of the request parameters must exactly match the request that yielded this token.
options (Google::Gax::CallOptions) —
Overrides the default settings for this call, e.g, timeout, retries, etc.

Returns:

(Enumerable<Google::Spanner::V1::PartialResultSet>) —
An enumerable of Google::Spanner::V1::PartialResultSet instances.

Raises:

(Google::Gax::GaxError) —
if the RPC is aborted.

# File 'lib/google/cloud/spanner/v1/spanner_client.rb', line 692

def streaming_read \
    session,
    table,
    columns,
    key_set,
    transaction: nil,
    index: nil,
    limit: nil,
    resume_token: nil,
    options: nil
  req = Google::Spanner::V1::ReadRequest.new({
    session: session,
    table: table,
    columns: columns,
    key_set: key_set,
    transaction: transaction,
    index: index,
    limit: limit,
    resume_token: resume_token
  }.delete_if { |_, v| v.nil? })
  @streaming_read.call(req, options)
end

Class: Google::Cloud::Spanner::V1::SpannerClient

Overview

Constant Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(service_path: SERVICE_ADDRESS, port: DEFAULT_SERVICE_PORT, channel: nil, chan_creds: nil, scopes: ALL_SCOPES, client_config: {}, timeout: DEFAULT_TIMEOUT, app_name: nil, app_version: nil, lib_name: nil, lib_version: "") ⇒ SpannerClient

Instance Attribute Details

#spanner_stub ⇒ Google::Spanner::V1::Spanner::Stub (readonly)

Class Method Details

.database_path(project, instance, database) ⇒ String

.match_database_from_database_name(database_name) ⇒ String

.match_database_from_session_name(session_name) ⇒ String

.match_instance_from_database_name(database_name) ⇒ String

.match_instance_from_session_name(session_name) ⇒ String

.match_project_from_database_name(database_name) ⇒ String

.match_project_from_session_name(session_name) ⇒ String

.match_session_from_session_name(session_name) ⇒ String

.session_path(project, instance, database, session) ⇒ String

Instance Method Details

#begin_transaction(session, options_, options: nil) ⇒ Google::Spanner::V1::Transaction

#commit(session, mutations, transaction_id: nil, single_use_transaction: nil, options: nil) ⇒ Google::Spanner::V1::CommitResponse

#create_session(database, options: nil) ⇒ Google::Spanner::V1::Session

#delete_session(name, options: nil) ⇒ Object

#execute_sql(session, sql, transaction: nil, params: nil, param_types: nil, resume_token: nil, query_mode: nil, options: nil) ⇒ Google::Spanner::V1::ResultSet

#execute_streaming_sql(session, sql, transaction: nil, params: nil, param_types: nil, resume_token: nil, query_mode: nil, options: nil) ⇒ Enumerable<Google::Spanner::V1::PartialResultSet>

#get_session(name, options: nil) ⇒ Google::Spanner::V1::Session

#read(session, table, columns, key_set, transaction: nil, index: nil, limit: nil, resume_token: nil, options: nil) ⇒ Google::Spanner::V1::ResultSet

#rollback(session, transaction_id, options: nil) ⇒ Object

#streaming_read(session, table, columns, key_set, transaction: nil, index: nil, limit: nil, resume_token: nil, options: nil) ⇒ Enumerable<Google::Spanner::V1::PartialResultSet>

#initialize(service_path: SERVICE_ADDRESS, port: DEFAULT_SERVICE_PORT, channel: nil, chan_creds: nil, scopes: ALL_SCOPES, client_config: {}, timeout: DEFAULT_TIMEOUT, app_name: nil, app_version: nil, lib_name: nil, lib_version: "") ⇒ `SpannerClient`

#spanner_stub ⇒ `Google::Spanner::V1::Spanner::Stub` (readonly)

.database_path(project, instance, database) ⇒ `String`

.match_database_from_database_name(database_name) ⇒ `String`

.match_database_from_session_name(session_name) ⇒ `String`

.match_instance_from_database_name(database_name) ⇒ `String`

.match_instance_from_session_name(session_name) ⇒ `String`

.match_project_from_database_name(database_name) ⇒ `String`

.match_project_from_session_name(session_name) ⇒ `String`

.match_session_from_session_name(session_name) ⇒ `String`

.session_path(project, instance, database, session) ⇒ `String`

#begin_transaction(session, options_, options: nil) ⇒ `Google::Spanner::V1::Transaction`

#commit(session, mutations, transaction_id: nil, single_use_transaction: nil, options: nil) ⇒ `Google::Spanner::V1::CommitResponse`

#create_session(database, options: nil) ⇒ `Google::Spanner::V1::Session`

#delete_session(name, options: nil) ⇒ `Object`

#execute_sql(session, sql, transaction: nil, params: nil, param_types: nil, resume_token: nil, query_mode: nil, options: nil) ⇒ `Google::Spanner::V1::ResultSet`

#execute_streaming_sql(session, sql, transaction: nil, params: nil, param_types: nil, resume_token: nil, query_mode: nil, options: nil) ⇒ `Enumerable<Google::Spanner::V1::PartialResultSet>`

#get_session(name, options: nil) ⇒ `Google::Spanner::V1::Session`

#read(session, table, columns, key_set, transaction: nil, index: nil, limit: nil, resume_token: nil, options: nil) ⇒ `Google::Spanner::V1::ResultSet`

#rollback(session, transaction_id, options: nil) ⇒ `Object`

#streaming_read(session, table, columns, key_set, transaction: nil, index: nil, limit: nil, resume_token: nil, options: nil) ⇒ `Enumerable<Google::Spanner::V1::PartialResultSet>`