form：选择不在数据库中保存值

Question

在我当前的spring项目中，我的实体中的某些字段通过select标记映射到视图中。此标记通过spring form标签形式实现：select，采用以下两种方式之一：

<form:select path="${entry.key}" class="form-control">
    <form:option value="${null}" label="--Selecione"></form:option>
    <form:options items="${values[entry.key]}" itemValue="id" itemLabel="nome" class="form-control">
    </form:options>
</form:select>

或

<form:select path="${entry.key}.id" class="form-control">
    <form:option value="${null}" label="--Selecione"></form:option>
    <form:options items="${values[entry.key]}" itemValue="id" itemLabel="nome" class="form-control">
    </form:options>
</form:select>

为此HTML代码重新设计：

<select id="pagina" name="pagina" class="form-control">
    <option value="" selected="selected">--Selecione</option>
    <option class="form-control" value="1">one</option>
</select>

和

<select id="pagina" name="pagina.id" class="form-control">
    <option value="" selected="selected">--Selecione</option>
    <option class="form-control" value="1">one</option>
</select>

实体类是：

@Entity
@Table(name="pagina")
public class Pagina {

    @Id
    @Column(name = "id")
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "nome", unique=true, nullable=false, length=32)
    @Order(value=1)
    private String nome;

    @Column(name = "titulo", nullable=false, length=32)
    @Order(value=2)
    private String titulo;

    @Column(name="resumo", length=140)
    @Order(value=3)
    private String resumo;

    @Column(name = "descricao", length=65535)
    @Order(value=4)
    private String descricao;

    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="pagina")
    @Cascade(value = { CascadeType.ALL })
    @Order(value=5)
    private Pagina pagina;

    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="produto")
    @Cascade(value = { CascadeType.ALL })
    @Order(value=6)
    private Produto produto;
}

当我使用第一个选项时，数据存储在数据库中，但没有外键值，它们保持为空。

当我使用第二个选项时，如果我尝试在数据库中插入或更新新项目，我会收到错误：

org.hibernate.PropertyValueException: not-null property references a null or transient value : com.spring.loja.model.pagina.persistence.model.Pagina.nome
    at org.hibernate.engine.internal.Nullability.checkNullability(Nullability.java:106)
    at org.hibernate.action.internal.AbstractEntityInsertAction.nullifyTransientReferencesIfNotAlready(AbstractEntityInsertAction.java:132)
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:86)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:490)
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:195)
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:179)
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:214)
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:324)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:288)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
    at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:206)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:149)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:801)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:794)
    at org.hibernate.engine.spi.CascadingActions$7.cascade(CascadingActions.java:314)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:350)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:293)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:118)
    at org.hibernate.event.internal.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:432)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:265)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
    at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:206)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:149)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)
    at com.spring.loja.config.generic.persistence.Dao.persist(Dao.java:33)
    at com.spring.loja.config.generic.persistence.Dao$$FastClassBySpringCGLIB$$ddbbe880.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:711)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644)
    at com.spring.loja.model.pagina.persistence.PaginaHome$$EnhancerBySpringCGLIB$$b6470cd.persist(<generated>)
    at com.spring.loja.config.generic.service.service.cadastra(service.java:39)
    at com.spring.loja.config.generic.service.service$$FastClassBySpringCGLIB$$c92a3159.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:711)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:64)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644)
    at com.spring.loja.model.pagina.service.PaginaService$$EnhancerBySpringCGLIB$$8aedfbd5.cadastra(<generated>)
    at com.spring.loja.config.generic.controller.controller.cadastra(controller.java:88)
    at com.spring.loja.config.generic.controller.controller$$FastClassBySpringCGLIB$$c8cc444b.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:640)
    at com.spring.loja.model.pagina.controller.PaginaController$$EnhancerBySpringCGLIB$$cc3f49f7_2.cadastra(<generated>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

任何人都可以告诉我我做错了什么？

更新

控制器类：

@RequestMapping(value="cadastra")
@PreAuthorize("hasPermission(#user, 'cadastra_'+#this.this.name)")
public ModelAndView cadastra() throws InstantiationException, IllegalAccessException {
    ModelAndView mav = new ModelAndView();

    mav.setViewName("private/cadastrar");
    mav.addObject("command", this.entityClass.newInstance());
    mav.addObject("entity", this.getName());
    mav.addObject("map", serv.getListaAtributos());
    mav.addObject("values", serv.getListaValores());

    return mav;
}
@RequestMapping(value="cadastra", method=RequestMethod.POST)
@ResponseBody
public String cadastra(@ModelAttribute("object") E object, BindingResult result) {
    if(serv.cadastra(object)) {
        return "yes";
    }
    else {
        return "not";
    }
}

服务类：

@PreAuthorize("hasPermission(#user, 'cadastra_'+#this.this.name)")
@Transactional
public boolean cadastra(E e) {
    return dao.persist(e);
}

dao class：

@Transactional
public boolean persist(E transientInstance) {
    try {
        sessionFactory.getCurrentSession().persist(transientInstance);
        return true;
    } catch (RuntimeException e) {
        e.printStackTrace();
        return false;
    }
}

Answer 1

我仍然无法弄清楚为什么以上不起作用，但我找到了一个有效的解决方案，在我的情况下，它更适合我的应用程序的必要条件。

我发现的解决方案是：

jsp代码

        <c:url value="/Categoria/listagem2.json" var="url"/>
        <form:label path="${entry}.id" class="label label-default">${entry}</form:label>
        <form:select path="${entry}.id" class="form-control select" data-lista="${url}">
        </form:select>

jquery代码

$("select.select").each(function(){
    var target = $(this);
    var lista = $(this).data('lista');
    load_options(target, lista);
});

function load_options(target, lista) {
    target.empty();
    target.append("<option class=\"form-control\" value=\"\"></option>");
    $.ajax({
        type: 'GET',
        url: lista
    }).done(function(data){
        var json = jQuery.parseJSON( data );
        $.each(json.item, function(index, item) {
            target.append('<option class="form-control" value="'+item.id+'">'+item.nome+'</option>');
        });
    });
}

我仍然需要更正第target.append("<option class=\"form-control\" value=\"\"></option>");行，但我确信这在使用硬编码示例进行测试后仍可正常工作。

Answer 2

我假设您在控制器get方法中使用Map对象。

@RequestMapping(value = "/paginapage.html", method = RequestMethod.GET)
public String goTopage(Map myMap){

myMap.put("pagina",new Pagina());

return "jsppage";

}

并在你的jsp页面上

<form:form method="post" action="paginacontroller.html" commandName="pagina">

    <form:select path="nome" class="form-control">

    </form:select>

</form:form>

您收到错误，因为在您的注释中，您指出它不应为null，但您检索到空值。

首先，如果你在地图中放置一个Pagina（）对象，你就可以像上面的例子一样使用它来形成弹簧。 commandName="pagina"引用Pagina（）对象，select元素中的path表示它是Pagina（）对象中的nome字段。

您可以在控制器中

@RequestMapping(value = "/paginacontroller.html", method = RequestMethod.POST)
public String processForm(Pagina paginaForm,HttpServletRequest request){

//call your service layer here to process the form.
//the Pagina() object here came from the form using the path, the value of the elements are stored in the fields. the path should be equal to the variable name (ex. path="nome" pagina.nome variable)
return "jsppage";
}