从Rails 3调用MySQL存储过程(返回resultset)时出错

adapter:mysql adapter:mysql2 database.yml

db = ActiveRecord::Base.connection.raw_connection
entries = Entry.find_by_sql( 'CALL sp_get_all_entries()' )

# we need to flush the result set otherwise following SQL statements cannot be processed
db.next_result if ( db.more_results? )

entries.each do |entry|
    puts entry.name
    puts entry.extra_column_from_sp
end