This class encapsulates a Result returned from
calling exec_query
on any database connection adapter. For
example:
x = ActiveRecord::Base.connection.exec_query('SELECT * FROM foo') x # => #<ActiveRecord::Result:0xdeadbeef>
# File lib/active_record/result.rb, line 13 def initialize(columns, rows, column_types = {}) @columns = columns @rows = rows @hash_rows = nil @column_types = column_types end
# File lib/active_record/result.rb, line 40 def [](idx) hash_rows[idx] end
# File lib/active_record/result.rb, line 20 def each hash_rows.each { |row| yield row } end
Returns true if there are no records.
# File lib/active_record/result.rb, line 32 def empty? rows.empty? end
# File lib/active_record/result.rb, line 48 def initialize_copy(other) @columns = columns.dup @rows = rows.dup @hash_rows = nil end
# File lib/active_record/result.rb, line 44 def last hash_rows.last end
# File lib/active_record/result.rb, line 36 def to_ary hash_rows end
# File lib/active_record/result.rb, line 24 def to_hash hash_rows end
# File lib/active_record/result.rb, line 55 def hash_rows @hash_rows ||= begin # We freeze the strings to prevent them getting duped when # used as keys in ActiveRecord::Base's @attributes hash columns = @columns.map { |c| c.dup.freeze } @rows.map { |row| # In the past we used Hash[columns.zip(row)] # though elegant, the verbose way is much more efficient # both time and memory wise cause it avoids a big array allocation # this method is called a lot and needs to be micro optimised hash = {} index = 0 length = columns.length while index < length hash[columns[index]] = row[index] index += 1 end hash } end end