JavaFX 将属性保存到数据库答案

【问题标题】：JavaFX saving properties to DBJavaFX 将属性保存到数据库
【发布时间】：2017-06-09 21:30:23
【问题描述】：

我正在编辑我原来的问题，因为我改变了很多，我仍然有同样的问题：

所以我的模型类是：

package beans;

import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

import javax.persistence.*;
import java.io.Serializable;

@Entity
@Table(name = "person")
@Access(AccessType.PROPERTY)
public class Person implements Serializable {

    private IntegerProperty id;
    private StringProperty firstName;
    private StringProperty lastName;
    private IntegerProperty age;
    private StringProperty address;

    public Person() {

    }

    public Person(int id, String firstName, String lastName, int age, String address) {
        this.id = new SimpleIntegerProperty(id);
        this.firstName = new SimpleStringProperty(firstName);
        this.lastName = new SimpleStringProperty(lastName);
        this.age = new SimpleIntegerProperty(age);
        this.address = new SimpleStringProperty(address);
    }

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    public int getId() {
        return id.get();
    }

    public void setId(int id) {
        this.id = new SimpleIntegerProperty(id);
    }

    public IntegerProperty IdProperty() {
        return id;
    }

    @Column(name = "firstname")
    public String getFirstName() {
        return firstName.get();
    }

    public void setFirstName(String firstName) {
        this.firstName = new SimpleStringProperty(firstName);
    }

    public StringProperty FirstNameProperty() {
        return firstName;
    }

    @Column(name = "lastname")
    public String getLastName() {
        return lastName.get();
    }

    public void setLastName(String lastName) {
        this.lastName = new SimpleStringProperty(lastName);
    }

    public StringProperty LastNameProperty() {
        return lastName;
    }

    @Column(name = "age")
    public int getAge() {
        return age.get();
    }

    public void setAge(int age) {
        this.age = new SimpleIntegerProperty(age);
    }

    public IntegerProperty AgeProperty() {
        return age;
    }

    @Column(name = "address")
    public String getAddress() {
        return address.get();
    }

    public void setAddress(String address) {
        this.address = new SimpleStringProperty(address);
    }

    public StringProperty AddressProperty() {
        return address;
    }

    @Override
    public String toString() {
        return "Person{" + "id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", age=" + age + ", address=" + address + '}';
    }


}

我的保存方法是：

@FXML
private void savePerson() {
    Person p = new Person();

    p.setFirstName(firstnameF.getText());
    p.setLastName(lastnameF.getText());
    p.setAge(Integer.parseInt(ageF.getText()));
    p.setAddress(addressF.getText());
    System.out.println(p);
    Configuration cfg = new Configuration().configure("hibernate.cfg.xml");
    SessionFactory sf = cfg.buildSessionFactory();


    try (Session session = sf.openSession()) {
        session.beginTransaction();

        session.save(p);
        session.getTransaction().commit();
        clearFields();

    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

我得到的最后错误是：

  Person{id=IntegerProperty [value: 1], firstName=StringProperty [value:    a], lastName=StringProperty [value: at], age=IntegerProperty [value: 2], address=StringProperty [value: a]}
    Jan 25, 2017 7:59:11 PM org.hibernate.Version logVersion
    INFO: HHH000412: Hibernate Core {5.2.7.Final}
    Jan 25, 2017 7:59:11 PM org.hibernate.cfg.Environment <clinit>
    INFO: HHH000206: hibernate.properties not found
    Jan 25, 2017 7:59:11 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
    INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
Jan 25, 2017 7:59:11 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
Jan 25, 2017 7:59:11 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/JavafxHibernateTest]
Jan 25, 2017 7:59:11 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {user=root, password=****}
Jan 25, 2017 7:59:11 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
Jan 25, 2017 7:59:11 PM org.hibernate.engine.jdbc.connections.internal.PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 50 (min=1)
Wed Jan 25 19:59:12 CET 2017 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Jan 25, 2017 7:59:12 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
Jan 25, 2017 7:59:12 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
INFO: HHH10001008: Cleaning up connection pool [jdbc:mysql://localhost:3306/JavafxHibernateTest]
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Node.fireEvent(Node.java:8413)
    at javafx.scene.control.Button.fire(Button.java:185)
    at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
    at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
    at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
    at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
    at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
    ... 48 more
Caused by: org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister
    at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:123)
    at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:77)
    at org.hibernate.metamodel.internal.MetamodelImpl.initialize(MetamodelImpl.java:128)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:297)
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:445)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:710)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:726)
    at beans.UiController.savePerson(UiController.java:43)
    ... 58 more
Caused by: org.hibernate.PropertyAccessException: Exception occurred inside getter of beans.Person.id
    at org.hibernate.property.access.spi.GetterMethodImpl.get(GetterMethodImpl.java:44)
    at org.hibernate.engine.internal.UnsavedValueFactory.getUnsavedIdentifierValue(UnsavedValueFactory.java:68)
    at org.hibernate.tuple.PropertyFactory.buildIdentifierAttribute(PropertyFactory.java:61)
    at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:135)
    at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:519)
    at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:124)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:96)
    ... 65 more
Caused by: java.lang.reflect.InvocationTargetException
    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 org.hibernate.property.access.spi.GetterMethodImpl.get(GetterMethodImpl.java:41)
    ... 75 more
Caused by: java.lang.NullPointerException
    at beans.Person.getId(Person.java:42)
    ... 80 more
BUILD SUCCESSFUL (total time: 31 seconds)

我真的不确定问题出在哪里，如果模型的原始类型而不是属性类型，我的模型工作正常，所以我假设模型很好，我更改了注释系统并且问题仍然存在，我清理了我的数据库，但我总是得到一个错误。

【问题讨论】：

也许分享您遇到的错误将有助于解决问题
我编辑了原始文件以包含错误
注释get 方法，而不是属性本身（即getAge，而不是age 或ageProperty()）。还要修正你的方法名称，它们不遵循约定：getFirstName() 不是 getfirstName()、setLastName() 不是 setlastName() 等等。参见svanimpe.be/blog/properties-jpa.html 和marshall.edu/genomicjava/2014/05/09/one-bean-to-bind-them-all
A) 不要在问题标题中添加 [SOLVED] 之类的内容。改为接受答案。 B) 不要添加问题的答案。如果没有提供此解决方案的答案，您可以回答自己的问题。顺便说一句：构造函数链接也是一种选择：public Person() { this(0, null, null, 0, null);} 替换属性也是一个坏主意。你可以懒惰地初始化属性，但这应该在属性方法中完成，并且应该从getter方法返回默认值，以防属性没有初始化......
@fabian 我更改了原始帖子并添加了对我的问题的答案，对此感到抱歉。干杯

标签： java mysql hibernate javafx properties

【解决方案1】：

我通过删除两个构造函数并使构造函数看起来像这样解决了我的问题：

public Person() {
this.id = new SimpleIntegerProperty(id);
this.firstName = new SimpleStringProperty(firstName);
this.lastName = new SimpleStringProperty(lastName);
this.age = new SimpleIntegerProperty(age);
this.address = new SimpleStringProperty(address);
}

之后一切正常

我也将所有设置器都更改为 from

public void setFirstName(String firstName) {
this.firstName = new SimpleStringProperty(firstName);
}

public void setFirstName(String firstName) {
this.firstName.set(firstName);
}

但这与原始问题无关。

【讨论】：

【解决方案2】：

将@Access(AccessType.PROPERTY) 注释添加到您的班级。现在 Hibernate 将在 getter 方法中查找列。然后将 @Column(name = "id") 注释添加到您的 getter。

@Entity
@Table(name = "person")
@Access(AccessType.PROPERTY)
public class Person implements Serializable {

    private IntegerProperty id;
    private StringProperty firstName;
    private StringProperty lastName;
    private IntegerProperty age;
    private StringProperty address;

    public Person() {
    }

    public Person(int id, String firstName, String lastName, int age, String address) {
        this.id = new SimpleIntegerProperty(id);
        this.firstName = new SimpleStringProperty(firstName);
        this.lastName = new SimpleStringProperty(lastName);
        this.age = new SimpleIntegerProperty(age);
        this.address = new SimpleStringProperty(address);
    }

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    public int getId() {
        return id.get();
    }

    public void setId(int id) {
        this.id = new SimpleIntegerProperty(id);
    }

    public IntegerProperty idProperty() {
        return id;
    }

    @Column(name = "firstname")
    public String getFirstName() {
        return firstName.get();
    }

    public void setFirstName(String firstName) {
        this.firstName = new SimpleStringProperty(firstName);
    }

    public StringProperty firstNameProperty() {
        return firstName;
    }

    @Column(name = "lastname")
    public String getLastName() {
        return lastName.get();
    }

    public void setLastName(String lastName) {
        this.lastName = new SimpleStringProperty(lastName);
    }

    public StringProperty lastNameProperty() {
        return lastName;
    }

    @Column(name = "age")
    public int getAge() {
        return age.get();
    }

    public void setAge(int age) {
        this.age = new SimpleIntegerProperty(age);
    }

    public IntegerProperty ageProperty() {
        return age;
    }

    @Column(name = "address")
    public String getAddress() {
        return address.get();
    }

    public void setAddress(String address) {
        this.address = new SimpleStringProperty(address);
    }

    public StringProperty addressProperty() {
        return address;
    }
}

【讨论】：

如果您注释 get 方法（而不是字段），Hibernate 将推断 AccessType.PROPERTY - 尽管我完全同意明确注释它是一种好习惯。
它不起作用我让我的课程看起来和你链接的完全一样，我仍然无法坚持，它抱怨 Person.getId 的调用目标和 nullPointer 异常
您使用默认构造函数来创建 Person 对象，但在该构造函数中您不会 inintalize 任何属性，这就是您得到 NullPointerException 的原因。