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
Example - ( Range ) — a new instance of Range
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
