Cloud Spanner API - Class Google::Cloud::Spanner::Project (v2.24.0)

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Reference documentation and code samples for the Cloud Spanner API class Google::Cloud::Spanner::Project.

Project

Projects are top-level containers in Google Cloud Platform. They store information about billing and authorized users, and they contain Cloud Spanner data. Each project has a friendly name and a unique ID.

Google::Cloud::Spanner::Project is the main object for interacting with Cloud Spanner.

Instance and Database objects are created, accessed, and managed by Google::Cloud::Spanner::Project.

A Client obtained from a project can be used to read and/or modify data in a Cloud Spanner database.

See new and Google::Cloud#spanner.

Inherits

• Object

Examples

Obtaining an instance and a database from a project.

require "google/cloud"

spanner = Google::Cloud::Spanner.new
instance = spanner.instance "my-instance"
database = instance.database "my-database"

Obtaining a client for use with a database.

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

db = spanner.client "my-instance", "my-database"

db.transaction do |tx|
  results = tx.execute_query "SELECT * FROM users"

  results.rows.each do |row|
    puts "User #{row[:id]} is #{row[:name]}"
  end
end

Methods

#batch_client

def batch_client(instance_id, database_id, labels: nil, query_options: nil, directed_read_options: nil) -> Client

Creates a Cloud Spanner batch client. A batch client is used to read data across multiple machines or processes.

The following settings can be provided:

• :exclude_replicas (Hash) Exclude_replicas indicates what replicas should be excluded from serving requests. Spanner will not route requests to the replicas in this list.
• :include_replicas (Hash) Include_replicas indicates the order of replicas to process the request. If auto_failover_disabled is set to true and all replicas are exhausted without finding a healthy replica, Spanner will wait for a replica in the list to become available, requests may fail due to DEADLINE_EXCEEDED errors.

Parameters

• instance_id (String) — The unique identifier for the instance. Required.
• database_id (String) — The unique identifier for the database. Required.
• labels (Hash) (defaults to: nil) —

  The labels to be applied to all sessions created by the batch client. Labels are a flexible and lightweight mechanism for organizing cloud resources into groups that reflect a customer's organizational needs and deployment strategies. Cloud Labels can be used to filter collections of resources. They can be used to control how resource metrics are aggregated. And they can be used as arguments to policy management rules (e.g. route, firewall, load balancing, etc.). Optional. The default is nil.

  • Label keys must be between 1 and 63 characters long and must conform to the following regular expression: [a-z]([-a-z0-9]*[a-z0-9])?.
  • Label values must be between 0 and 63 characters long and must conform to the regular expression ([a-z]([-a-z0-9]*[a-z0-9])?)?.
  • No more than 64 labels can be associated with a given resource.
• query_options (Hash) (defaults to: nil) —

  A hash of values to specify the custom query options for executing SQL query. Query options are optional. The following settings can be provided:

  • :optimizer_version (String) The version of optimizer to use. Empty to use database default. "latest" to use the latest available optimizer version.
  • :optimizer_statistics_package (String) Statistics package to use. Empty to use the database default.
• directed_read_options (Hash) (defaults to: nil) — Client options used to set the directed_read_options for all ReadRequests and ExecuteSqlRequests that indicates which replicas or regions should be used for non-transactional reads or queries. Will represent Google::Cloud::Spanner::V1::DirectedReadOptions

Returns

• (Client) — The newly created client.

Example

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

batch_client = spanner.batch_client "my-instance", "my-database"

batch_snapshot = batch_client.batch_snapshot
serialized_snapshot = batch_snapshot.dump

partitions = batch_snapshot.partition_read "users", [:id, :name]

partition = partitions.first
serialized_partition = partition.dump

# In a separate process
new_batch_snapshot = batch_client.load_batch_snapshot \
  serialized_snapshot

new_partition = batch_client.load_partition \
  serialized_partition

results = new_batch_snapshot.execute_partition \
  new_partition

#client

def client(instance_id, database_id, pool: {}, labels: nil, query_options: nil, database_role: nil, directed_read_options: nil) -> Client

Creates a Cloud Spanner client. A client is used to read and/or modify data in a Cloud Spanner database.

The following settings can be provided:

• :exclude_replicas (Hash) Exclude_replicas indicates what replicas should be excluded from serving requests. Spanner will not route requests to the replicas in this list.
• :include_replicas (Hash) Include_replicas indicates the order of replicas to process the request. If auto_failover_disabled is set to true and all replicas are exhausted without finding a healthy replica, Spanner will wait for a replica in the list to become available, requests may fail due to DEADLINE_EXCEEDED errors.

Parameters

• instance_id (String) — The unique identifier for the instance. Required.
• database_id (String) — The unique identifier for the database. Required.
• pool (Hash) (defaults to: {}) —

  Settings to control how and when sessions are managed by the client. The following settings can be provided:

  • :min (Integer) Minimum number of sessions that the client will maintain at any point in time. The default is 10.
  • :max (Integer) Maximum number of sessions that the client will have at any point in time. The default is 100.
  • :keepalive (Numeric) The amount of time a session can be idle before an attempt is made to prevent the idle sessions from being closed by the Cloud Spanner service. The default is 1800 (30 minutes).
  • :fail (true/false) When true the client raises a SessionLimitError when the client has allocated the max number of sessions. When false the client blocks until a session becomes available. The default is true.
  • :threads (Integer) The number of threads in the thread pool. The default is twice the number of available CPUs.
  • :write_ratio (Float) Deprecated. This field is no longer needed and will be removed in a future release.
• labels (Hash) (defaults to: nil) —

  The labels to be applied to all sessions created by the client. Cloud Labels are a flexible and lightweight mechanism for organizing cloud resources into groups that reflect a customer's organizational needs and deployment strategies. Cloud Labels can be used to filter collections of resources. They can be used to control how resource metrics are aggregated. And they can be used as arguments to policy management rules (e.g. route, firewall, load balancing, etc.). Optional. The default is nil.

  • Label keys must be between 1 and 63 characters long and must conform to the following regular expression: [a-z]([-a-z0-9]*[a-z0-9])?.
  • Label values must be between 0 and 63 characters long and must conform to the regular expression ([a-z]([-a-z0-9]*[a-z0-9])?)?.
  • No more than 64 labels can be associated with a given resource.
• query_options (Hash) (defaults to: nil) —

  A hash of values to specify the custom query options for executing SQL query. Query options are optional. The following settings can be provided:

  • :optimizer_version (String) The version of optimizer to use. Empty to use database default. "latest" to use the latest available optimizer version.
  • :optimizer_statistics_package (String) Statistics package to use. Empty to use the database default.
• directed_read_options (Hash) (defaults to: nil) — Client options used to set the directed_read_options for all ReadRequests and ExecuteSqlRequests that indicates which replicas or regions should be used for non-transactional reads or queries. Will represent Google::Cloud::Spanner::V1::DirectedReadOptions

Returns

• (Client) — The newly created client.

Example

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

db = spanner.client "my-instance", "my-database"

db.transaction do |tx|
  results = tx.execute_query "SELECT * FROM users"

  results.rows.each do |row|
    puts "User #{row[:id]} is #{row[:name]}"
  end
end

#create_database

def create_database(instance_id, database_id, statements: [], encryption_config: nil) -> Database::Job

Creates a database and starts preparing it to begin serving.

See Database::Job.

Parameters

• instance_id (String) — The unique identifier for the instance. Required.
• database_id (String) — The unique identifier for the database, which cannot be changed after the database is created. Values are of the form [a-z][a-z0-9_\-]*[a-z0-9] and must be between 2 and 30 characters in length. Required.
• statements (Array<String>) (defaults to: []) — DDL statements to run inside the newly created database. Statements can create tables, indexes, etc. These statements execute atomically with the creation of the database: if there is an error in any statement, the database is not created. Optional.
• encryption_config (Hash) (defaults to: nil) —

  An encryption configuration describing the encryption type and key resources in Cloud KMS. Optional. The following settings can be provided:

  • :kms_key_name (String) The name of KMS key to use which should be the full path, e.g., projects/<project>/locations/<location>\ /keyRings/<key_ring>/cryptoKeys/<kms_key_name>

Returns

• (Database::Job) — The job representing the long-running, asynchronous processing of a database create operation.

Examples

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

job = spanner.create_database "my-instance",
                              "my-new-database"

job.done? #=> false
job.reload! # API call
job.done? #=> true

if job.error?
  status = job.error
else
  database = job.database
end

Create with encryption config

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

kms_key_name = "projects/<project>/locations/<location>/keyRings/<key_ring>/cryptoKeys/<kms_key_name>"
encryption_config = { kms_key_name: kms_key_name }
job = spanner.create_database "my-instance",
                              "my-new-database",
                              encryption_config: encryption_config

job.done? #=> false
job.reload! # API call
job.done? #=> true

if job.error?
  status = job.error
else
  database = job.database
end

#create_instance

def create_instance(instance_id, name: nil, config: nil, nodes: nil, processing_units: nil, labels: nil) -> Instance::Job

Creates a Cloud Spanner instance and starts preparing it to begin serving.

See Instance::Job.

Parameters

• instance_id (String) — The unique identifier for the instance, which cannot be changed after the instance is created. Values are of the form [a-z][-a-z0-9]*[a-z0-9] and must be between 6 and 30 characters in length. Required.
• name (String) (defaults to: nil) — The descriptive name for this instance as it appears in UIs. Must be unique per project and between 4 and 30 characters in length. Required.
• config (String, Instance::Config) (defaults to: nil) — The name of the instance's configuration. Values can be the instance_config_id, the full path, or an Instance::Config object. Required.
• nodes (Integer) (defaults to: nil) — The number of nodes allocated to this instance. Optional. Specify either nodes or processing_units
• processing_units (Integer) (defaults to: nil) — The number of processing units allocated to this instance. Optional. Specify either nodes or processing_units
• labels (Hash) (defaults to: nil) —

  Cloud Labels are a flexible and lightweight mechanism for organizing cloud resources into groups that reflect a customer's organizational needs and deployment strategies. Cloud Labels can be used to filter collections of resources. They can be used to control how resource metrics are aggregated. And they can be used as arguments to policy management rules (e.g. route, firewall, load balancing, etc.).

  • Label keys must be between 1 and 63 characters long and must conform to the following regular expression: [a-z]([-a-z0-9]*[a-z0-9])?.
  • Label values must be between 0 and 63 characters long and must conform to the regular expression ([a-z]([-a-z0-9]*[a-z0-9])?)?.
  • No more than 64 labels can be associated with a given resource.

Returns

• (Instance::Job) — The job representing the long-running, asynchronous processing of an instance create operation.

Raises

• (ArgumentError) — if both processing_units or nodes are specified.

Examples

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

job = spanner.create_instance "my-new-instance",
                              name: "My New Instance",
                              config: "regional-us-central1",
                              nodes: 5,
                              labels: { production: :env }

job.done? #=> false
job.reload! # API call
job.done? #=> true

if job.error?
  status = job.error
else
  instance = job.instance
end

Create instance using processsing units

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

job = spanner.create_instance "my-new-instance",
                              name: "My New Instance",
                              config: "regional-us-central1",
                              processing_units: 500,
                              labels: { production: :env }

job.done? #=> false
job.reload! # API call
job.done? #=> true

if job.error?
  status = job.error
else
  instance = job.instance
end

#database

def database(instance_id, database_id) -> Google::Cloud::Spanner::Database, nil

Retrieves a database by unique identifier.

Parameters

• instance_id (String) — The unique identifier for the instance.
• database_id (String) — The unique identifier for the database.

Returns

• (Google::Cloud::Spanner::Database, nil) — The database, or nil if the database does not exist.

Examples

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
database = spanner.database "my-instance", "my-database"

Will return nil if instance does not exist.

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
database = spanner.database "my-instance", "my-database" # nil

#databases

def databases(instance_id, token: nil, max: nil) -> Array<Google::Cloud::Spanner::Database>

Retrieves the list of databases for the project.

Parameters

• instance_id (String) — The unique identifier for the instance.
• token (String) (defaults to: nil) — The token value returned by the last call to databases; indicates that this is a continuation of a call, and that the system should return the next page of data.
• max (Integer) (defaults to: nil) — Maximum number of databases to return.

Returns

• (Array<Google::Cloud::Spanner::Database>) — The list of databases. (See Database::List)

Examples

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

databases = spanner.databases "my-instance"
databases.each do |database|
  puts database.database_id
end

Retrieve all: (See Instance::Config::List#all)

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

databases = spanner.databases "my-instance"
databases.all do |database|
  puts database.database_id
end

#instance

def instance(instance_id) -> Google::Cloud::Spanner::Instance, nil

Retrieves a Cloud Spanner instance by unique identifier.

Parameter

• instance_id (String) — The unique identifier for the instance.

Returns

• (Google::Cloud::Spanner::Instance, nil) — The instance, or nil if the instance does not exist.

Examples

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
instance = spanner.instance "my-instance"

Will return nil if instance does not exist.

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
instance = spanner.instance "non-existing" # nil

#instance_config

def instance_config(instance_config_id) -> Google::Cloud::Spanner::Instance::Config, nil

Retrieves an instance configuration by unique identifier.

Parameter

• instance_config_id (String) — The instance configuration identifier. Values can be the instance_config_id, or the full path.

Returns

• (Google::Cloud::Spanner::Instance::Config, nil) — The instance configuration, or nil if the instance configuration does not exist.

Examples

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
config = spanner.instance_config "regional-us-central1"

Will return nil if instance config does not exist.

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new
config = spanner.instance_config "non-existing" # nil

#instance_configs

def instance_configs(token: nil, max: nil) -> Array<Google::Cloud::Spanner::Instance::Config>

Retrieves the list of instance configurations for the project.

Parameters

• token (String) (defaults to: nil) — The token value returned by the last call to instance_configs; indicates that this is a continuation of a call, and that the system should return the next page of data.
• max (Integer) (defaults to: nil) — Maximum number of instance configs to return.

Returns

• (Array<Google::Cloud::Spanner::Instance::Config>) — The list of instance configurations. (See Instance::Config::List)

Examples

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

instance_configs = spanner.instance_configs
instance_configs.each do |config|
  puts config.instance_config_id
end

Retrieve all: (See Instance::Config::List#all)

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

instance_configs = spanner.instance_configs
instance_configs.all do |config|
  puts config.instance_config_id
end

#instances

def instances(token: nil, max: nil) -> Array<Google::Cloud::Spanner::Instance>

Retrieves the list of Cloud Spanner instances for the project.

Parameters

• token (String) (defaults to: nil) — The token value returned by the last call to instances; indicates that this is a continuation of a call, and that the system should return the next page of data.
• max (Integer) (defaults to: nil) — Maximum number of instances to return.

Returns

• (Array<Google::Cloud::Spanner::Instance>) — The list of instances. (See Instance::List)

Examples

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

instances = spanner.instances
instances.each do |instance|
  puts instance.instance_id
end

Retrieve all: (See Instance::Config::List#all)

require "google/cloud/spanner"

spanner = Google::Cloud::Spanner.new

instances = spanner.instances
instances.all do |instance|
  puts instance.instance_id
end

#project

def project()

Alias Of: #project_id

The identifier for the Cloud Spanner project.

Example

require "google/cloud"

spanner = Google::Cloud::Spanner.new(
  project_id: "my-project",
  credentials: "/path/to/keyfile.json"
)

spanner.project_id #=> "my-project"

#project_id

def project_id()

Aliases

• #project

The identifier for the Cloud Spanner project.

Example

require "google/cloud"

spanner = Google::Cloud::Spanner.new(
  project_id: "my-project",
  credentials: "/path/to/keyfile.json"
)

spanner.project_id #=> "my-project"