File: dbconsole.rb

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require 'erb'
require 'yaml'
require 'optparse'

include_password = false
options = {}

OptionParser.new do |opt|
  opt.banner = "Usage: dbconsole [options] [environment]"
  opt.on("-p", "--include-password", "Automatically provide the password from database.yml") do |v|
    include_password = true
  end

  opt.on("--mode [MODE]", ['html', 'list', 'line', 'column'],
    "Automatically put the sqlite3 database in the specified mode (html, list, line, column).") do |mode|
      options['mode'] = mode
  end

  opt.on("-h", "--header") do |h|
    options['header'] = h
  end

  opt.parse!(ARGV)
  abort opt.to_s unless (0..1).include?(ARGV.size)
end

env = ARGV.first || ENV['RAILS_ENV'] || 'development'
unless config = YAML::load(ERB.new(IO.read(RAILS_ROOT + "/config/database.yml")).result)[env]
  abort "No database is configured for the environment '#{env}'"
end


def find_cmd(*commands)
  dirs_on_path = ENV['PATH'].to_s.split(File::PATH_SEPARATOR)
  commands += commands.map{|cmd| "#{cmd}.exe"} if RUBY_PLATFORM =~ /win32/

  full_path_command = nil
  found = commands.detect do |cmd|
    dir = dirs_on_path.detect do |path|
      full_path_command = File.join(path, cmd)
      File.executable? full_path_command
    end
  end
  found ? full_path_command : abort("Couldn't find database client: #{commands.join(', ')}. Check your $PATH and try again.")
end

case config["adapter"]
when "mysql"
  args = {
    'host'      => '--host',
    'port'      => '--port',
    'socket'    => '--socket',
    'username'  => '--user',
    'encoding'  => '--default-character-set'
  }.map { |opt, arg| "#{arg}=#{config[opt]}" if config[opt] }.compact

  if config['password'] && include_password
    args << "--password=#{config['password']}"
  elsif config['password'] && !config['password'].to_s.empty?
    args << "-p"
  end

  args << config['database']

  exec(find_cmd('mysql', 'mysql5'), *args)

when "postgresql"
  ENV['PGUSER']     = config["username"] if config["username"]
  ENV['PGHOST']     = config["host"] if config["host"]
  ENV['PGPORT']     = config["port"].to_s if config["port"]
  ENV['PGPASSWORD'] = config["password"].to_s if config["password"] && include_password
  exec(find_cmd('psql'), config["database"])

when "sqlite"
  exec(find_cmd('sqlite'), config["database"])

when "sqlite3"
  args = []

  args << "-#{options['mode']}" if options['mode']
  args << "-header" if options['header']
  args << config['database']

  exec(find_cmd('sqlite3'), *args)
else
  abort "Unknown command-line client for #{config['database']}. Submit a Rails patch to add support!"
end