如何通过ssh Ruby使用cmd从psql获取数据

Question

i want to get data in database psql from my computer local vi ssh ruby. But my program not finish and print output

$messageid = 'xxx'
$table_data_base = 'yyy'
 ...........    
Net::SSH.start($host, $user_name, :password => $pass_word) do |ssh|
  ssh.exec!("PGPASSWORD='pass' psql -d data_base_name -U user_name")
  data_mail = ssh.exec!("SELECT * FROM #{$table_data_base} WHERE messageid=#{$messageid};")
end
puts data_mail

Answer 1

I just find answer of my question: it similar using cmd ssh to get data:

 cmd1 = "PGPASSWORD='pass' psql -d data_base_name -U user_name"
 cmd2 = "\\\"SELECT * FROM #{$table_data_base} WHERE messageid=#{$messageid};\\\""
 Net::SSH.start($host, $user_name, :password => $pass_word) do |ssh|
   data_mail = ssh.exec!("#{cmd1} -c #{cmd2}")
 end

or we use simple cmd ssh to connect and get data

data_mail = %x[ssh #{cmd1} -c #{cmd2}]