fix many rows result only return one

[chestarss]

---

:backends:

• mysql
  :mysql:
  :host : localhost
  :user : root
  :pass : mypass
  :database : config

  :query:
  - select value from node_params as a,nodes as b where a.node_id=b.node_id and b.fqdn='%{::fqdn}' and param='%{key}'
  - select class_name as %{key} from %{ostype} as a,classes as b where a.class_id=b.class_id;

:logger: console

root@debian:/usr/lib/ruby/vendor_ruby/hiera/backend# hiera -c /etc/puppet/hiera.yaml classes ostype='Redhat'
test
root@debian:/usr/lib/ruby/vendor_ruby/hiera/backend# hiera -c /etc/puppet/hiera.yaml classes ostype='Debian'
["ntp", "nginx"]
root@debian:/usr/lib/ruby/vendor_ruby/hiera/backend# hiera -c /etc/puppet/hiera.yaml -a nginx::params::config_file_abs_path ::fqdn='squid.example.com'
["/etc/nginx/nginx.conf"]
root@debian:/usr/lib/ruby/vendor_ruby/hiera/backend# hiera -c /etc/puppet/hiera.yaml classes ostype='Redhat' -a
["test"]