Java Vaadin DATEFILD将空值保存到数据库
我用的是VAADIN 8,正在解决一个问题。我已绑定FormLayout上的所有字段,并希望保存值从数据库中的这些字段。所有字段都用值填充。问题的实质是,当对象保存到数据库时,DateField值被发送为null 问题是为什么DateField有空值,以及如何赢得这个问题 瓦丁v.8.6.2 实体(简化): OrderService(简化): 绑定(简化):Java Vaadin DATEFILD将空值保存到数据库,java,hibernate,binding,vaadin,vaadin8,Java,Hibernate,Binding,Vaadin,Vaadin8,我用的是VAADIN 8,正在解决一个问题。我已绑定FormLayout上的所有字段,并希望保存值从数据库中的这些字段。所有字段都用值填充。问题的实质是,当对象保存到数据库时,DateField值被发送为null 问题是为什么DateField有空值,以及如何赢得这个问题 瓦丁v.8.6.2 实体(简化): OrderService(简化): 绑定(简化): 除了自定义转换器类中的一个小细节外,一切都正常:Date类的用法有一个不一致 有三次您使用java.sql.Date作为类的标识符,但
除了自定义转换器类中的一个小细节外,一切都正常:Date类的用法有一个不一致 有三次您使用java.sql.Date作为类的标识符,但有一次您忘记了它(
implements Converter
),并且错误地使用了java.utils.Date
在那里添加包路径java.sql.Date
也可以达到目的
import com.vaadin.data.Converter;
import com.vaadin.data.Result;
import com.vaadin.data.ValueContext;
import java.sql.Date;
import java.time.LocalDate;
public class SqlDateToLocalDateConverter implements Converter<LocalDate, java.sql.Date> {
@Override
public Result<java.sql.Date> convertToModel(LocalDate value, ValueContext context) {
if (value == null) {
return Result.ok(null);
}
return Result.ok( java.sql.Date.valueOf(value) );
}
@Override
public LocalDate convertToPresentation(java.sql.Date value, ValueContext context) {
if (value == null) {
return LocalDate.now();
}
return value.toLocalDate();
}
}
import com.vaadin.data.Converter;
导入com.vaadin.data.Result;
导入com.vaadin.data.ValueContext;
导入java.sql.Date;
导入java.time.LocalDate;
公共类SqlDateToLocalDateConverter实现转换器{
@凌驾
公共结果转换模型(LocalDate值、ValueContext上下文){
如果(值==null){
返回Result.ok(空);
}
返回Result.ok(java.sql.Date.valueOf(value));
}
@凌驾
公共LocalDate convertToPresentation(java.sql.Date值、ValueContext上下文){
如果(值==null){
返回LocalDate.now();
}
返回值.toLocalDate();
}
}
转换器在convertToModel中返回java.sql.Date,但creationDate的类型是Date(我假设它是java.utils.Date)。您确定需要自定义转换器吗?您是否尝试过现有的LocalDateToDateConverter?creationDate字段是Order Entity中的java.sql.Date类型如果我使用LocalDateToDateConverter(即).withConverter(新的LocalDateToDateConverter())
),那么我会收到setter的编译错误“不兼容类型:日期不能转换为日期”好的,那么我觉得没问题:(我注意到的最后一件事可能是,在您的转换器类中,您将Date与包路径一起使用了3次,但有一次您没有(实现转换器
)。您可以尝试使用implements Converter
?这不是问题,因为它会因为不兼容的类型而生成编译错误。您在哪里调试?您是否尝试在转换器中调试,以查看它返回的是实际日期而不是空值?我仍然有点困惑为什么这是可能的。当我尝试录制时用其中的错误创建转换器,它在我的IDE中显著地显示了一个错误,编译失败。这很奇怪。我的IDE在旧版本的converterHi@Cashbee中没有显示任何错误,不幸的是,该情况再次出现。我再次获得了相同的stacktrace。但是,在调试过程中,我发现converter类的值是正确的(!=null,值是date)。但是,save()
方法尝试为creationDate
字段保存null值。private void save(){if(binder.validate().isOk()){orderService.persist(order);close();changeHandler.onChange();}
是否可能是日期字段本身清除了内容?哦,不!也许你需要这样做:orderService.persist(binder.getBean());
仅使用注释来帮助你有点麻烦。如果我的建议不能直接解决这个问题,那么最好就这一点发表一篇新的帖子:)遗憾的是,我得到了同样的结果。我对此进行了新的讨论:
public class OrderService {
private static OrderDao orderService;
public OrderService() {
orderService = new OrderDao();
}
public void persist(Order entity) {
orderService.openCurrentSessionwithTransaction();
orderService.persist(entity);
orderService.closeCurrentSessionwithTransaction();
}
}
Binder<Order> binder = new Binder<>(Order.class);
FormLayout formLayout = new FormLayout();
TextField description = new TextField("Description");
DateField creationDate = new DateField("Creation Date");
private Button save = new Button("Save");
private Button cancel = new Button("Cancel");
HorizontalLayout actions = new HorizontalLayout();
actions.addComponents(save, cancel);
formLayout.addComponents(clientId, description, creationDate, actions);
creationDate.setDateFormat("yyyy-MM-dd HH:mm:ss");
binder.forField(this.clientId)
.bind(Order::getClientID, Order::setClientID);
binder.forField(this.description)
.bind(Order::getDescription, Order::setDescription);
binder.forField(this.creationDate)
.withConverter(new SqlDateToLocalDateConverter())
.bind(Order::getCreationDate, Order::setCreationDate); //the likely problem
binder.bindInstanceFields(this);
binder.setBean(order);
save.addClickListener(e -> save());
cancel.addClickListener(e -> close());
import com.vaadin.data.Converter;
import com.vaadin.data.Result;
import com.vaadin.data.ValueContext;
import java.sql.Date;
import java.time.LocalDate;
public class SqlDateToLocalDateConverter implements Converter<LocalDate, Date> {
@Override
public Result<java.sql.Date> convertToModel(LocalDate value, ValueContext context) {
if (value == null) {
return Result.ok(null);
}
return Result.ok( java.sql.Date.valueOf(value) );
}
@Override
public LocalDate convertToPresentation(java.sql.Date value, ValueContext context) {
if (value == null) {
return LocalDate.now();
}
return value.toLocalDate();
}
}
org.hibernate.PropertyValueException: not-null property references a null or transient value : com.haulmont.testtask.model.Order.creationDate
at org.hibernate.engine.internal.Nullability.checkNullability(Nullability.java:108)
at org.hibernate.engine.internal.Nullability.checkNullability(Nullability.java:56)
at org.hibernate.action.internal.AbstractEntityInsertAction.nullifyTransientReferencesIfNotAlready(AbstractEntityInsertAction.java:115)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:69)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:645)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:282)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:263)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:317)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:359)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:292)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:200)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:131)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:709)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:701)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:696)
at com.haulmont.testtask.dao.OrderDao.persist(OrderDao.java:67)
at com.haulmont.testtask.service.OrderService.persist(OrderService.java:18)
at com.haulmont.testtask.ui.AddOrderModalView.save(AddOrderModalView.java:187)
at com.haulmont.testtask.ui.AddOrderModalView.lambda$new$61446b05$1(AddOrderModalView.java:111)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:499)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:273)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:237)
at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1014)
at com.vaadin.ui.Button.fireClick(Button.java:384)
at com.vaadin.ui.Button$1.click(Button.java:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:155)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:116)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:445)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:410)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:274)
at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:90)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1601)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:445)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:845)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1689)
at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:225)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1676)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1174)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1106)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
at org.eclipse.jetty.server.Server.handle(Server.java:524)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:319)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:253)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
at java.lang.Thread.run(Thread.java:748)
import com.vaadin.data.Converter;
import com.vaadin.data.Result;
import com.vaadin.data.ValueContext;
import java.sql.Date;
import java.time.LocalDate;
public class SqlDateToLocalDateConverter implements Converter<LocalDate, java.sql.Date> {
@Override
public Result<java.sql.Date> convertToModel(LocalDate value, ValueContext context) {
if (value == null) {
return Result.ok(null);
}
return Result.ok( java.sql.Date.valueOf(value) );
}
@Override
public LocalDate convertToPresentation(java.sql.Date value, ValueContext context) {
if (value == null) {
return LocalDate.now();
}
return value.toLocalDate();
}
}