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# File railties/lib/rails/commands/dbconsole/dbconsole_command.rb, line 17
    def start
      ENV["RAILS_ENV"] ||= @options[:environment] || environment

      case config["adapter"]
      when /^(jdbc)?mysql/
        args = {
          "host"      => "--host",
          "port"      => "--port",
          "socket"    => "--socket",
          "username"  => "--user",
          "encoding"  => "--default-character-set",
          "sslca"     => "--ssl-ca",
          "sslcert"   => "--ssl-cert",
          "sslcapath" => "--ssl-capath",
          "sslcipher" => "--ssl-cipher",
          "sslkey"    => "--ssl-key"
        }.map { |opt, arg| "#{arg}=#{config[opt]}" if config[opt] }.compact

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

        args << config["database"]

        find_cmd_and_exec(["mysql", "mysql5"], *args)

      when /^postgres|^postgis/
        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"] && @options["include_password"]
        find_cmd_and_exec("psql", config["database"])

      when "sqlite3"
        args = []

        args << "-#{@options['mode']}" if @options["mode"]
        args << "-header" if @options["header"]
        args << File.expand_path(config["database"], Rails.respond_to?(:root) ? Rails.root : nil)

        find_cmd_and_exec("sqlite3", *args)

      when "oracle", "oracle_enhanced"
        logon = ""

        if config["username"]
          logon = config["username"].dup
          logon << "/#{config['password']}" if config["password"] && @options["include_password"]
          logon << "@#{config['database']}" if config["database"]
        end

        find_cmd_and_exec("sqlplus", logon)

      when "sqlserver"
        args = []

        args += ["-D", "#{config['database']}"] if config["database"]
        args += ["-U", "#{config['username']}"] if config["username"]
        args += ["-P", "#{config['password']}"] if config["password"]

        if config["host"]
          host_arg = +"#{config['host']}"
          host_arg << ":#{config['port']}" if config["port"]
          args += ["-S", host_arg]
        end

        find_cmd_and_exec("sqsh", *args)

      else
        abort "Unknown command-line client for #{config['database']}."
      end
    end
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