(1) rails xforms-d mysql
Edit database.yml

. / script / generate scaffold user information: text

rake db: create: all

rake db: migrate

Add a user
New add_user.xhtml 
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml"
	xmlns:xf="http://www.w3.org/2002/xforms">
	<head>
		<title>Search Form v3</title>
		<xf:model>
			<xf:instance>
				<xf:person>
					<xf:username></xf:username>
					<xf:password></xf:password>
				</xf:person>
			</xf:instance>

			<xf:submission action="/users/create" method="post" />
		</xf:model>
	</head>
	<body>

		<p>
			<xf:input ref="xf:username">
				<xf:label>名字:</xf:label>
			</xf:input>
			<xf:input ref="xf:password">
				<xf:label>密码:</xf:label>
			</xf:input>
			<xf:submit submission="submit-search">
				<xf:label>Add User</xf:label>
			</xf:submit>
		</p>

	</body>
</html>

<xf:submission action="/users/create" method="post" /> designated submitted action

Modify users_controller: create 

  def create
    doc = REXML::Document.new("<person></person>")
    params[:person].each_pair do |key,value|
    	if key.index(':') == nil and key != "xmlns"
    		el = REXML::Element.new("xf:"+key)
    		el.add_text value
    		doc.root.add(el)
    	else
    		doc.root.add_attribute(key,value)
  		end
    	end
    
		@user = User.new
		@user.infomation = doc.to_s
    
    respond_to do |format|
      if @user.save
        flash[:notice] = 'User was successfully created.'
        format.html { redirect_to(@user) }
        format.xml  { render :xml => @user, :status => :created, :location => @user }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @user.errors, :status => :unprocessable_entity }
      end
    end
  end