# File sql-serialize.rb, line 166
  def sql_fetch_primary_key_value
    pk = self.instance_eval("@" << @sql_primary_key.id2name)
    if (pk.kind_of? String)
      return sql_quote_str(pk)
    elsif (pk.kind_of? Date)
      return sql_quote_date (pk)
    elsif (pk.kind_of? Time)
      return sql_quote_time (pk)
    elsif (pk.kind_of? Numeric)
      return  pk.to_s
    end
  end