#!/usr/local/bin/ruby
require "mysql2"
require "watir"
require "csv"

Mysql2::Client.default_query_options.merge!(:as => :array)
mysql = Mysql2::Client.new(:host => "1.2.3.4", :username => "usr", :password => "pass123", :database => "db")

db = "db"

puts "Please enter all `table`.`column` pairs you wish to select from; separated by a comma and space."
tCP = gets.chomp.split(", ")

dynQ = "SELECT "
tCP.each {|pair| dynQ << (db + "." + pair + ", ") }

puts "Please enter the `table` you wish to select from:"
tF = db + "." + gets.chomp

dynQ = dynQ.chop!.chop! + " FROM " + tF + " LIMIT 10;"

report = mysql.query(dynQ)

begin
  report = mysql.query(dynQ)
  report.each {|row| puts row}

  puts "Query Successful!"

rescue Mysql2::Error => e
  puts e.errno
  puts e.error

  puts "Please re-nter all `table`.`column` pairs separated by, ', '."
  tCP = gets.chomp!.split(", ")

  dynQ = "SELECT "
  tCP.each {|pair| dynQ << (db + "." + pair + ", ") }

  tF = db + "."
  puts "Now re-enter the `table` to select `FROM`:"
  tF << gets.chomp!

  dynQ = dynQ.chop!.chop! + " FROM " + tF + " LIMIT 10;"

  retry
end

/Users/guy/.rvm/gems/ruby-2.3.0/gems/mysql2-0.4.2/lib/mysql2/client.rb:107:in '_query': Table 'db.table_dne' doesn't exist (Mysql2::Error)
    from /Users/guy/.rvm/gems/ruby-2.3.0/gems/mysql2-0.4.2/lib/mysql2/client.rb:107:in 'block in query'
    from /Users/guy/.rvm/gems/ruby-2.3.0/gems/mysql2-0.4.2/lib/mysql2/client.rb:106:in 'handle_interrupt'
    from /Users/guy/.rvm/gems/ruby-2.3.0/gems/mysql2-0.4.2/lib/mysql2/client.rb:106:in 'query'
    from file.rb:23:in '<main>'

/Users/guy/.rvm/gems/ruby-2.3.0/gems/mysql2-0.4.2/lib/mysql2/client.rb:107:in '_query': Unknown column 'db.table_dne' doesn't exist (Mysql2::Error)
    from /Users/guy/.rvm/gems/ruby-2.3.0/gems/mysql2-0.4.2/lib/mysql2/client.rb:107:in 'block in query'
    from /Users/guy/.rvm/gems/ruby-2.3.0/gems/mysql2-0.4.2/lib/mysql2/client.rb:106:in 'handle_interrupt'
    from /Users/guy/.rvm/gems/ruby-2.3.0/gems/mysql2-0.4.2/lib/mysql2/client.rb:106:in 'query'
    from file.rb:23:in '<main>'