Class: Hotdog::Expression::NothingNode

Inherits:

QueryExpressionNode

• Object
• ExpressionNode
• QueryExpressionNode
• Hotdog::Expression::NothingNode

Defined in:

lib/hotdog/expression/semantics.rb

Instance Attribute Summary

Attributes inherited from QueryExpressionNode

#query, #values

Instance Method Summary

• #evaluate(environment, options = {}) ⇒ Object
• #initialize(options = {}) ⇒ NothingNode constructor

  A new instance of NothingNode.

Methods inherited from QueryExpressionNode

#dump

Methods inherited from ExpressionNode

#dump, #optimize

Constructor Details

#initialize(options = {}) ⇒ NothingNode

# File 'lib/hotdog/expression/semantics.rb', line 537

def initialize(options={})
  super("SELECT NULL AS host_id WHERE host_id NOT NULL", [], options)
end

Instance Method Details

#evaluate(environment, options = {}) ⇒ Object

# File 'lib/hotdog/expression/semantics.rb', line 541

def evaluate(environment, options={})
  if @fallback
    @fallback.evaluate(environment, options)
  else
    []
  end
end