Module: DbMod::Statements::Configuration::Single::Value

Defined in:
lib/db_mod/statements/configuration/single/value.rb

Overview

Wrapper for a statement or prepared method that returns the first column of the first returned row, or nil if no rows are returned by the query.

def_statement(:a, 'SELECT 1').single(:value)

def do_stuff
  a # => '1'
end

Class Method Summary collapse

Class Method Details

.call(results) ⇒ String?

Enables this module to be passed to DbMod::Statements::Configuration.attach_result_processor as the wrapper function, where it will return the first column of the first row of the result set, or nil if no results are returned.

Parameters:

  • results (Object) —

    SQL result set

Returns:

  • (String, nil) —

    the first column of the first returned row



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# File 'lib/db_mod/statements/configuration/single/value.rb', line 22

def self.call(results)
  return nil unless results.any?

  row = results[0]
  row[row.keys.first]
end