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module DataObjects
# Abstract class to read rows from a query result
class Reader
include Enumerable
# Return the array of field names
def fields
raise NotImplementedError.new
end
# Return the array of field values for the current row. Not legal after next! has returned false or before it's been called
def values
raise NotImplementedError.new
end
# Close the reader discarding any unread results.
def close
raise NotImplementedError.new
end
# Discard the current row (if any) and read the next one (returning true), or return nil if there is no further row.
def next!
raise NotImplementedError.new
end
# Return the number of fields in the result set.
def field_count
raise NotImplementedError.new
end
# Yield each row to the given block as a Hash
def each
begin
while next!
row = {}
fields.each_with_index { |field, index| row[field] = values[index] }
yield row
end
ensure
close
end
self
end
end
end
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