You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hsqldb_database_tasks.rb
    path of file: ./repos/activerecord-jdbc-adapter/lib/arjdbc/tasks
    
    the code of the file until where you have to start completion: require 'arjdbc/tasks/jdbc_database
    
      def drop
        error = nil
        begin
          establish_connection(config)
          do_drop_database(config)
        rescue => e
          error = e
          raise error
        ensure
          begin
            keep_db_files = ENV['KEEP_DB_FILES'] && ENV['KEEP_DB_FILES'] != 'false'
            delete_database_files(config) unless keep_db_files
          rescue => e
            raise e unless error
          end