Class: Google::Apis::SpannerV1::KeyRange

Inherits:

Object

• Object
• Google::Apis::SpannerV1::KeyRange

Includes:

Core::Hashable, Core::JsonObjectSupport

Defined in:

lib/google/apis/spanner_v1/classes.rb,
lib/google/apis/spanner_v1/representations.rb,
lib/google/apis/spanner_v1/representations.rb

Overview

KeyRange represents a range of rows in a table or index. A range has a start key and an end key. These keys can be open or closed, indicating if the range includes rows with that key. Keys are represented by lists, where the ith value in the list corresponds to the ith component of the table or index primary key. Individual values are encoded as described here. For example, consider the following table definition: CREATE TABLE UserEvents ( UserName STRING(MAX), EventDate STRING(10) ) PRIMARY KEY(UserName, EventDate); The following keys name rows in this table: "Bob", "2014-09-23" Since the UserEvents table's PRIMARY KEY clause names two columns, each UserEvents key has two elements; the first is the UserName, and the second is the EventDate. Key ranges with multiple components are interpreted lexicographically by component using the table or index key's declared sort order. For example, the following range returns all events for user "Bob" that occurred in the year 2015: "start_closed": ["Bob", "2015-01-01"] " end_closed": ["Bob", "2015-12-31"] Start and end keys can omit trailing key components. This affects the inclusion and exclusion of rows that exactly match the provided key components: if the key is closed, then rows that exactly match the provided components are included; if the key is open, then rows that exactly match are not included. For example, the following range includes all events for "Bob" that occurred during and after the year 2000: " start_closed": ["Bob", "2000-01-01"] "end_closed": ["Bob"] The next example retrieves all events for "Bob": "start_closed": ["Bob"] "end_closed": ["Bob"] To retrieve events before the year 2000: "start_closed": ["Bob"] "end_open": [ "Bob", "2000-01-01"] The following range includes all rows in the table: " start_closed": [] "end_closed": [] This range returns all users whose UserName begins with any character from A to C: "start_closed": ["A"] " end_open": ["D"] This range returns all users whose UserName begins with B: " start_closed": ["B"] "end_open": ["C"] Key ranges honor column sort order. For example, suppose a table is defined as follows: CREATE TABLE DescendingSortedTable Key INT64, ... ) PRIMARY KEY(Key DESC); The following range retrieves all rows with key values between 1 and 100 inclusive: " start_closed": ["100"] "end_closed": ["1"] Note that 100 is passed as the start, and 1 is passed as the end, becauseKey` is a descending column in the schema.

Instance Attribute Summary

• #end_closed ⇒ Array<Object>

  If the end is closed, then the range includes all rows whose first len( end_closed) key columns exactly match end_closed.

• #end_open ⇒ Array<Object>

  If the end is open, then the range excludes rows whose first len(end_open) key columns exactly match end_open.

• #start_closed ⇒ Array<Object>

  If the start is closed, then the range includes all rows whose first len( start_closed) key columns exactly match start_closed.

• #start_open ⇒ Array<Object>

  If the start is open, then the range excludes rows whose first len(start_open) key columns exactly match start_open.

Instance Method Summary

• #initialize(**args) ⇒ KeyRange constructor

  A new instance of KeyRange.

• #update!(**args) ⇒ Object

  Update properties of this object.

Constructor Details

#initialize(**args) ⇒ KeyRange

Returns a new instance of KeyRange.

# File 'lib/google/apis/spanner_v1/classes.rb', line 2131

def initialize(**args)
   update!(**args)
end

Instance Attribute Details

#end_closed ⇒ Array<Object>

If the end is closed, then the range includes all rows whose first len( end_closed) key columns exactly match end_closed. Corresponds to the JSON property endClosed

Returns:

• (Array<Object>)

# File 'lib/google/apis/spanner_v1/classes.rb', line 2111

def end_closed
  @end_closed
end

#end_open ⇒ Array<Object>

If the end is open, then the range excludes rows whose first len(end_open) key columns exactly match end_open. Corresponds to the JSON property endOpen

Returns:

• (Array<Object>)

# File 'lib/google/apis/spanner_v1/classes.rb', line 2117

def end_open
  @end_open
end

#start_closed ⇒ Array<Object>

If the start is closed, then the range includes all rows whose first len( start_closed) key columns exactly match start_closed. Corresponds to the JSON property startClosed

Returns:

• (Array<Object>)

# File 'lib/google/apis/spanner_v1/classes.rb', line 2123

def start_closed
  @start_closed
end

#start_open ⇒ Array<Object>

If the start is open, then the range excludes rows whose first len(start_open) key columns exactly match start_open. Corresponds to the JSON property startOpen

Returns:

• (Array<Object>)

# File 'lib/google/apis/spanner_v1/classes.rb', line 2129

def start_open
  @start_open
end

Instance Method Details

#update!(**args) ⇒ Object

Update properties of this object

# File 'lib/google/apis/spanner_v1/classes.rb', line 2136

def update!(**args)
  @end_closed = args[:end_closed] if args.key?(:end_closed)
  @end_open = args[:end_open] if args.key?(:end_open)
  @start_closed = args[:start_closed] if args.key?(:start_closed)
  @start_open = args[:start_open] if args.key?(:start_open)
end