Cloud Spanner API - Class Google::Cloud::Spanner::Range (v2.27.0)

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

Range

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.

Inherits

  • Object

Example

 require 
  
 "google/cloud/spanner" 
 spanner 
  
 = 
  
 Google 
 :: 
 Cloud 
 :: 
 Spanner 
 . 
 new 
 db 
  
 = 
  
 spanner 
 . 
 client 
  
 "my-instance" 
 , 
  
 "my-database" 
 key_range 
  
 = 
  
 db 
 . 
 range 
  
 1 
 , 
  
 100 
 results 
  
 = 
  
 db 
 . 
 read 
  
 "users" 
 , 
  
 [ 
 :id 
 , 
  
 :name 
 ] 
 , 
  
 keys 
 : 
  
 key_range 
 results 
 . 
 rows 
 . 
 each 
  
 do 
  
 | 
 row 
 | 
  
 puts 
  
 "User 
 #{ 
 row 
 [ 
 :id 
 ] 
 } 
 is 
 #{ 
 row 
 [ 
 :name 
 ] 
 } 
 " 
 end 

Methods

#begin

  def 
  
 begin 
 () 
 

Returns the object that defines the beginning of the range.

#end

  def 
  
 end 
 () 
 

Returns the object that defines the end of the range.

#exclude_begin?

  def 
  
 exclude_begin? 
 () 
  
 - 
>  
 Boolean 
 

Returns true if the range excludes its beginning value.

Returns
  • (Boolean)

#exclude_end?

  def 
  
 exclude_end? 
 () 
  
 - 
>  
 Boolean 
 

Returns true if the range excludes its end value.

Returns
  • (Boolean)

#initialize

  def 
  
 initialize 
 ( 
 beginning 
 , 
  
 ending 
 , 
  
 exclude_begin 
 : 
  
 false 
 , 
  
 exclude_end 
 : 
  
 false 
 ) 
  
 - 
>  
 Range 
 

Creates a Spanner Range. This can be used in place of a Ruby Range when needing to exclude the beginning value.

Parameters
  • beginning(Object) — The object that defines the beginning of the range.
  • ending(Object) — The object that defines the end of the range.
  • exclude_begin(Boolean) (defaults to: false) — Determines if the range excludes its beginning value. Default is false .
  • exclude_end(Boolean) (defaults to: false) — Determines if the range excludes its ending value. Default is false .
Returns
  • ( Range ) — a new instance of Range
Example
 require 
  
 "google/cloud/spanner" 
 spanner 
  
 = 
  
 Google 
 :: 
 Cloud 
 :: 
 Spanner 
 . 
 new 
 db 
  
 = 
  
 spanner 
 . 
 client 
  
 "my-instance" 
 , 
  
 "my-database" 
 key_range 
  
 = 
  
 Google 
 :: 
 Cloud 
 :: 
 Spanner 
 :: 
 Range 
 . 
 new 
  
 1 
 , 
  
 100 
 results 
  
 = 
  
 db 
 . 
 read 
  
 "users" 
 , 
  
 [ 
 :id 
 , 
  
 :name 
 ] 
 , 
  
 keys 
 : 
  
 key_range 
 results 
 . 
 rows 
 . 
 each 
  
 do 
  
 | 
 row 
 | 
  
 puts 
  
 "User 
 #{ 
 row 
 [ 
 :id 
 ] 
 } 
 is 
 #{ 
 row 
 [ 
 :name 
 ] 
 } 
 " 
 end 
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