Class Sequel::SQL::OrderedExpression
In: lib/sequel/sql.rb
Parent: Expression

Represents a column/expression to order the result set by.

Methods

asc   desc   invert   new  

Constants

INVERT_NULLS = {:first=>:last, :last=>:first}.freeze

Attributes

descending  [R]  Whether the expression should order the result set in a descending manner
expression  [R]  The expression to order the result set by.
nulls  [R]  Whether to sort NULLS FIRST/LAST

Public Class methods

new(expression, descending = true, opts={})

Set the expression and descending attributes to the given values. Options:

:nulls :Can be :first/:last for NULLS FIRST/LAST.

[Source]

     # File lib/sequel/sql.rb, line 857
857:       def initialize(expression, descending = true, opts={})
858:         @expression, @descending, @nulls = expression, descending, opts[:nulls]
859:       end

Public Instance methods

asc()

Return a copy that is ordered ASC

[Source]

     # File lib/sequel/sql.rb, line 862
862:       def asc
863:         OrderedExpression.new(@expression, false, :nulls=>@nulls)
864:       end
desc()

Return a copy that is ordered DESC

[Source]

     # File lib/sequel/sql.rb, line 867
867:       def desc
868:         OrderedExpression.new(@expression, true, :nulls=>@nulls)
869:       end
invert()

Return an inverted expression, changing ASC to DESC and NULLS FIRST to NULLS LAST.

[Source]

     # File lib/sequel/sql.rb, line 872
872:       def invert
873:         OrderedExpression.new(@expression, !@descending, :nulls=>INVERT_NULLS.fetch(@nulls, @nulls))
874:       end

[Validate]