spring - Update one column does not works -

i want update 1 column of database. column name status , type enum('waiting' , 'accepted' , 'rejected') want update column when click on link:

<a href="requests/action?id=${vac.id}&a=accepted">accept</a> <a href="requests/action?id=${vac.id}&a=rejected">reject</a> 

vacation.hbm.xml

<?xml version="1.0" encoding="utf-8"?> <!doctype hibernate-mapping public         "-//hibernate/hibernate mapping dtd 3.0//en"         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.terafast.tem.model">     <class name="vacation" table="vacations" dynamic-update="true">         <id name="id" column="request_id">             <generator class="native" />         </id>         <property name="user" column="user_id" />         <property name="reason" column="reason" />         <property name="duration" column="how_long" />         <property name="status" column="status" />         <property name="start" type="date" column="start_date" />         <property name="created" type="date" column="created_at" />     </class> </hibernate-mapping> 

controller

@requestmapping(value = "/requests/action") public string statuhandler(httpservletrequest request, model model) {     int id = integer.parseint(request.getparameter("id"));     string status = request.getparameter("a");     vacationdao.actionstatus(id, status);      return "redirect:/admin/requests"; 

i can these 2 values. (id , a). vacationdaoimpl:

@override @transactional public void actionstatus(int id, string action) {     session session = sessionfactory.opensession();     query q = session.createquery("from vacation id = :reqid ");     q.setparameter("reqid", id);     vacation vacation = (vacation) q.list().get(0);      vacation.setstatus(action);     session.update(vacation); } 

servlet-context.xml

<?xml version="1.0" encoding="utf-8"?> <beans xmlns:mvc="http://www.springframework.org/schema/mvc"     xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns="http://www.springframework.org/schema/beans"     xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"     xsi:schemalocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">      <!-- dispatcherservlet context: defines servlet's request-processing          infrastructure -->      <!-- enables spring mvc @controller programming model -->     <mvc:annotation-driven />      <!-- handles http requests /resources/** efficiently serving          static resources in ${webapproot}/resources directory -->     <mvc:resources mapping="/resources/**" location="/resources/" />      <!-- resolves views selected rendering @controllers .jsp resources          in /web-inf/views directory -->     <bean         class="org.springframework.web.servlet.view.internalresourceviewresolver">         <property name="prefix" value="/web-inf/views/" />         <property name="suffix" value=".jsp" />     </bean>      <context:component-scan base-package="com.terafast.tem" />      <tx:annotation-driven transaction-manager="transactionmanager" />     <bean id="transactionmanager"         class="org.springframework.orm.hibernate4.hibernatetransactionmanager">         <property name="sessionfactory" ref="sessionfactory" />     </bean>      <bean id="employeedao" class="com.terafast.tem.dao.employeedaoimpl">         <constructor-arg>             <ref bean="sessionfactory" />         </constructor-arg>     </bean>      <bean id="vacationdoa" class="com.terafast.tem.dao.vacationdaoimpl">         <constructor-arg>             <ref bean="sessionfactory" />         </constructor-arg>     </bean>  </beans> 

i have seen approach in this tutorial. when click on links, looks good. column value not change. explain problem?