下拉框的数据如何绑定

问题求教,我现在做了一个php?name=%CF%C2%C0%AD%C1%D0%B1%ED" onclick="tagshow(event)" class="t_tag">下拉列表框
<select id="user_id" name="user_id" >
 <% @sysemployees = SysEmployee.find(:all) %>
 <% for sysemployee in @sysemployees %>
  <option value=<%=h sysemployee.loginname %> ><%=h sysemployee.username %></option>
 <% end %>
</select>
我如何与数据库字段绑定起来,可以保存?