外鍵沒有默認值

Question

這是我的User.java

@Entity
@Table(name = "user")
public class User implements Serializable {
    private static final long serialVersionUID = 1L;

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

    @Column(name = "FIRST_NAME")
    private String firstName;

    @Column(name = "LAST_NAME")
    private String lastName;

    @Column(name = "EMAIL")
    private String email;

    @OneToMany(cascade={CascadeType.ALL})
    @JoinColumn(name="USER_ID")
    private Collection<Address> addresses;
}

這是我的Address.java

@Entity
@Table(name = "address")
public class Address implements Serializable {

    private static final long serialVersionUID = 1L;

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

    @Column(name = "TOWN")
    private String town;

    @Column(name = "DISTRICT")
    private String district;

    @Column(name = "COUNTRY")
    private String country;

    @ManyToOne
    @JoinColumn(name = "USER_ID", insertable=false, updatable=false, nullable=false)
    private User user;    
}

但是當我試圖持久化對象時，卻遇到了這個異常

javax.servlet.ServletException: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not insert: [com.kpowd.model.Address]
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)
root cause

javax.faces.el.EvaluationException: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not insert: [com.kpowd.model.Address]
    javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
    com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:101)
    javax.faces.component.UICommand.broadcast(UICommand.java:315)
    javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:798)
    javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1331)
    com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:181)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:645)
root cause

javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not insert: [com.kpowd.model.Address]
    org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1387)
    org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1315)
    org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1321)
    org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:843)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
    com.sun.proxy.$Proxy19.persist(Unknown Source)
    com.kpowd.dao.basedao.GenericDaoImpl.create(GenericDaoImpl.java:47)
    com.kpowd.service.impl.UserServiceImpl.registerUser(UserServiceImpl.java:34)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    com.sun.proxy.$Proxy20.registerUser(Unknown Source)
    com.kpowd.controller.UserRegistrationBean.register(UserRegistrationBean.java:80)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.apache.el.parser.AstValue.invoke(AstValue.java:278)
    org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
    com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
    com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:101)
    javax.faces.component.UICommand.broadcast(UICommand.java:315)
    javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:798)
    javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1331)
    com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:181)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:645)
root cause

org.hibernate.exception.GenericJDBCException: could not insert: [com.kpowd.model.Address]
    org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)
    org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)
    org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
    org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:64)
    org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2345)
    org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2852)
    org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
    org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
    org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320)
    org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
    org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
    org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:69)
    org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:179)
    org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135)
    org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:799)
    org.hibernate.impl.SessionImpl.persist(SessionImpl.java:791)
    org.hibernate.engine.EJB3CascadingAction$1.cascade(EJB3CascadingAction.java:48)
    org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:392)
    org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:335)
    org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204)
    org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:425)
    org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:362)
    org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:338)
    org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204)
    org.hibernate.engine.Cascade.cascade(Cascade.java:161)
    org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:475)
    org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:353)
    org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
    org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
    org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:69)
    org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:179)
    org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135)
    org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:61)
    org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:808)
    org.hibernate.impl.SessionImpl.persist(SessionImpl.java:782)
    org.hibernate.impl.SessionImpl.persist(SessionImpl.java:786)
    org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:837)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
    com.sun.proxy.$Proxy19.persist(Unknown Source)
    com.kpowd.dao.basedao.GenericDaoImpl.create(GenericDaoImpl.java:47)
    com.kpowd.service.impl.UserServiceImpl.registerUser(UserServiceImpl.java:34)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    com.sun.proxy.$Proxy20.registerUser(Unknown Source)
    com.kpowd.controller.UserRegistrationBean.register(UserRegistrationBean.java:80)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.apache.el.parser.AstValue.invoke(AstValue.java:278)
    org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
    com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
    com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:101)
    javax.faces.component.UICommand.broadcast(UICommand.java:315)
    javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:798)
    javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1331)
    com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:181)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:645)
root cause

java.sql.SQLException: Field 'USER_ID' doesn't have a default value
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
    com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3558)
    com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3490)
    com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
    com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2109)
    com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2648)
    com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2077)
    com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2362)
    com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2280)
    com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2265)
    org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94)
    org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)
    org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2345)
    org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2852)
    org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
    org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
    org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320)
    org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
    org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
    org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:69)
    org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:179)
    org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135)
    org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:799)
    org.hibernate.impl.SessionImpl.persist(SessionImpl.java:791)
    org.hibernate.engine.EJB3CascadingAction$1.cascade(EJB3CascadingAction.java:48)
    org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:392)
    org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:335)
    org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204)
    org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:425)
    org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:362)
    org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:338)
    org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204)
    org.hibernate.engine.Cascade.cascade(Cascade.java:161)
    org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:475)
    org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:353)
    org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
    org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
    org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:69)
    org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:179)
    org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135)
    org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:61)
    org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:808)
    org.hibernate.impl.SessionImpl.persist(SessionImpl.java:782)
    org.hibernate.impl.SessionImpl.persist(SessionImpl.java:786)
    org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:837)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
    com.sun.proxy.$Proxy19.persist(Unknown Source)
    com.kpowd.dao.basedao.GenericDaoImpl.create(GenericDaoImpl.java:47)
    com.kpowd.service.impl.UserServiceImpl.registerUser(UserServiceImpl.java:34)

如果我從FORIGN_KEY“ USER_ID”中刪除了“ NOTNULL”約束，那么錯誤就不會出現，但是我需要將其作為NOTNULL列，我該怎么做。 請幫我？？

這是我的注冊方法

public String register() {
        // Output some info     


        Address a = new Address();
        a.setCountry("country1");
        a.setDistrict("district1");
        a.setTown("town");

        Address b = new Address();
        b.setCountry("country2");
        b.setDistrict("district2");
        b.setTown("town2");

        List<Address> adrlist=new ArrayList<Address>();
        adrlist.add(a);
        adrlist.add(b);

        User user = new User();
        user.setFirstName("firstname");
        user.setLastName("lastname");
        user.setEmail("email");
        user.setAddresses(adrlist);


        // Call the business object to register the user
        userService.registerUser(user);

        // Set the message here
        FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_INFO, "Registration success", "success");  
        FacesContext.getCurrentInstance().addMessage(null, msg);
        System.out.println("befor redirect");
        return "index?faces-redirect=true";
    }

這是我的SQL腳本

CREATE DATABASE  IF NOT EXISTS `myshop`;
USE `myshop`;

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `FIRST_NAME` varchar(45) DEFAULT NULL,
  `LAST_NAME` varchar(45) DEFAULT NULL,
  `EMAIL` varchar(45) DEFAULT NULL,
  PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=46 DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS `address`;
CREATE TABLE `address` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `TOWN` varchar(45) DEFAULT NULL,
  `DISTRICT` varchar(45) DEFAULT NULL,
  `COUNTRY` varchar(45) DEFAULT NULL,
  `USER_ID` int(11) NOT NULL,
  PRIMARY KEY (`ID`),
  KEY `FK_USER_idx` (`USER_ID`),
  CONSTRAINT `FK_USER` FOREIGN KEY (`USER_ID`) REFERENCES `user` (`ID`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;

Answer 1

對我來說，您似乎指定了錯誤的關系。 在這里查看我的問答。 您特別希望查看單向1對多示例。 使用您當前的配置，我認為Hibernate嘗試創建2個單向1到許多關系，這正在引起問題。

在@JoinColumn批注中指定insertable = false, updateable = false, nullable = false @JoinColumn insertable = false, updateable = false, nullable = false不會做任何事情。 僅當您使用Hibernate基於注釋創建數據庫模式時，這些修飾符才會起作用。 由於您已經有一個架構，因此它不會執行任何操作。

如果可以發布registerUser方法，則對調試很有幫助。

public class Address implements Serializable {
    ....
    @ManyToOne
    @JoinColumn(name = "USER_ID")
    private User user;
}

public class User implements Serializable{
    ....
    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
    private Collection<Address> addresses;
}

Answer 2

作為異常，您將得到java.sql.SQLException: Field 'USER_ID' doesn't have a default value您可以使用@JoinColumn(name = "USER_ID", insertable=false, updatable=false, nullable=false), columnDefinition = “int default 100"注解@JoinColumn(name = "USER_ID", insertable=false, updatable=false, nullable=false), columnDefinition = “int default 100"注解為Hibernate中的列設置默認值。 @JoinColumn(name = "USER_ID", insertable=false, updatable=false, nullable=false), columnDefinition = “int default 100"

盡管可以將默認值設為100，但您仍可以給出任何值。

第二件事，可能是您在制作外鍵時希望在某處添加referencedColumnName = "SOME_COLUMN" 。

希望能幫助到你。

編輯：

請讓我解釋一下，referencedColumnName可用於將另一列指定為另一張表的默認ID列。

Table1
    id int identity
    tableb_key varchar


Table2
    id int identity
    key varchar unique

// in class for Table1
@Joincolumn(column="tableb_key", referencedColumnName="key")

Answer 3

當進行OneToMany和ManyToOne時，您必須在Chilid對象中添加Parent對象以及在Parent Ojbect中添加Child對象，這意味着您需要執行a.setUser（user）;。 b.setUser（用戶）;