我有一个应用程序（使用注释的Spring 4 MVC + Hibernate 4 + MySQL + Maven集成示例），使用基于注释的配置将Spring与Hibernate集成。
我有这张桌子
CREATE TABLE `t_device_event` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`device_event_lat` float(10,6) DEFAULT NULL,
`device_event_lng` float(10,6) DEFAULT NULL,
`device_id` int(11) unsigned NOT NULL,
`device_event_message` varchar(100) DEFAULT NULL,
`device_event_received` TIMESTAMP ,
`coordinates` point NULL,
`version` int(11) NULL,
PRIMARY KEY (`id`),
KEY `device_id` (`device_id`),
CONSTRAINT `t_device_event_ibfk_1` FOREIGN KEY (`device_id`) REFERENCES `t_device` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
和这个
CREATE TABLE `t_device` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`device_key` varchar(50) DEFAULT NULL,
`device_type` varchar(50) DEFAULT NULL,
`device_desc` varchar(100) DEFAULT NULL,
`application_id` int(11) unsigned NOT NULL,
`version` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `application_id` (`application_id`),
CONSTRAINT `t_device_ibfk_1` FOREIGN KEY (`application_id`) REFERENCES `t_application` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1;
此域名对象：
@Entity
@Table(name = "t_device")
@NamedQueries(value = { @NamedQuery(name = "Device.findByKey",
query = "from Device as d where d.key = :key") })
public class Device implements Serializable {
/**
*
*/
private static final long serialVersionUID = -7176158728352557756L;
private static final Long DEFAULT_VERSION = new Long(0);
enum Type {
ANDROID, IOS
}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "device_key", unique = true, nullable = false)
private String key;
@Column(name = "device_desc")
private String desc;
@Enumerated(EnumType.STRING)
@Column(name = "device_type")
private Type type;
@OneToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "application_id",
referencedColumnName = "id")
private Application application;
@Version
@Column(name = "version")
private Long version = DEFAULT_VERSION;
/**
* Instantiates a new device.
*/
public Device() {
super();
}
/**
* Instantiates a new device.
*
* @param key
* the key
*/
public Device(final String key) {
super();
this.key = key;
}
/**
* Gets the id.
*
* @return the id
*/
public Long getId() {
return id;
}
/**
* Sets the id.
*
* @param id
* the new id
*/
public void setId(final Long id) {
this.id = id;
}
/**
* Gets the key.
*
* @return the key
*/
public String getKey() {
return key;
}
/**
* Sets the key.
*
* @param key
* the new key
*/
public void setKey(final String key) {
this.key = key;
}
/**
* Gets the desc.
*
* @return the desc
*/
public String getDesc() {
return desc;
}
/**
* Sets the desc.
*
* @param desc
* the new desc
*/
public void setDesc(final String desc) {
this.desc = desc;
}
/**
* Gets the type.
*
* @return the type
*/
public Type getType() {
return type;
}
/**
* Sets the type.
*
* @param p_type
* the new type
*/
public void setType(final Type p_type) {
type = p_type;
}
/**
* Gets the application.
*
* @return the application
*/
public Application getApplication() {
return application;
}
/**
* Sets the application.
*
* @param application
* the new application
*/
public void setApplication(final Application application) {
this.application = application;
}
/**
* Gets the version.
*
* @return the version
*/
public Long getVersion() {
return version;
}
/**
* Sets the version.
*
* @param p_version
* the new version
*/
public void setVersion(final Long p_version) {
version = p_version;
}
/*
* (non-Javadoc)
*
* @see com.yaptechnology.jpa.domain.BaseEntity#equals(java.lang.Object)
*/
@Override
public boolean equals(final Object p_obj) {
boolean isEquals = false;
try {
final Device device = (Device) p_obj;
final EqualsBuilder eb = new EqualsBuilder();
eb.append(getKey(), device.getKey());
eb.append(getDesc(), device.getDesc());
eb.append(getType(), device.getType());
isEquals = eb.isEquals();
} catch (final Exception e) {
isEquals = false;
}
return isEquals;
}
/*
* (non-Javadoc)
*
* @see com.yaptechnology.jpa.domain.BaseEntity#hashCode()
*/
@Override
public int hashCode() {
final HashCodeBuilder hcb = new HashCodeBuilder();
hcb.append(getKey());
hcb.append(getDesc());
hcb.append(getType());
return hcb.toHashCode();
}
/*
* (non-Javadoc)
*
* @see com.yaptechnology.jpa.domain.BaseEntity#toString()
*/
@Override
public String toString() {
ToStringBuilder tsb = new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE);
tsb.append("id", getId());
tsb.append("key", getKey());
tsb.append("desc", getDesc());
tsb.append("type", getType());
tsb.append("version", getVersion());
return tsb.toString();
}
}
@Entity
@Table(name = "t_device_event")
public class DeviceEvent {
private static final Long DEFAULT_VERSION = new Long(0);
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@ManyToOne
@JoinColumn(name = "device_id")
private Device device;
@Column(name = "device_event_received")
private Long received;
@Column(name = "device_event_message")
private String message;
@Version
@Column(name = "version")
private Long version = DEFAULT_VERSION;
@Embedded
private Coordinates coordinates;
/**
* Instantiates a new device event.
*
* @param device
* the device
*/
public DeviceEvent(final Device device) {
super();
this.device = device;
}
/**
* Gets the coordinates.
*
* @return the coordinates
*/
public Coordinates getCoordinates() {
return coordinates;
}
/**
* Sets the coordinates.
*
* @param coordinates
* the new coordinates
*/
public void setCoordinates(final Coordinates coordinates) {
this.coordinates = coordinates;
}
/**
* Gets the id.
*
* @return the id
*/
public Long getId() {
return id;
}
/**
* Sets the id.
*
* @param id
* the new id
*/
public void setId(final Long id) {
this.id = id;
}
/**
* Gets the device.
*
* @return the device
*/
public Device getDevice() {
return device;
}
/**
* Sets the device.
*
* @param device
* the new device
*/
public void setDevice(final Device device) {
this.device = device;
}
/**
* Gets the received.
*
* @return the received
*/
public Long getReceived() {
return received;
}
/**
* Sets the received.
*
* @param received
* the new received
*/
public void setReceived(final Long received) {
this.received = received;
}
/**
* Gets the message.
*
* @return the message
*/
public String getMessage() {
return message;
}
/**
* Sets the message.
*
* @param message
* the new message
*/
public void setMessage(final String message) {
this.message = message;
}
/**
* Gets the version.
*
* @return the version
*/
public Long getVersion() {
return version;
}
/**
* Sets the version.
*
* @param p_version
* the new version
*/
public void setVersion(final Long p_version) {
version = p_version;
}
/*
* (non-Javadoc)
*
* @see com.yaptechnology.jpa.domain.BaseEntity#equals(java.lang.Object)
*/
@Override
public boolean equals(final Object p_obj) {
boolean isEquals = false;
try {
final DeviceEvent deviceEvent = (DeviceEvent) p_obj;
final EqualsBuilder eb = new EqualsBuilder();
eb.append(getReceived(), deviceEvent.getReceived());
eb.append(getMessage(), deviceEvent.getMessage());
eb.append(getDevice(), deviceEvent.getDevice());
isEquals = eb.isEquals();
} catch (final Exception e) {
isEquals = false;
}
return isEquals;
}
/*
* (non-Javadoc)
*
* @see com.yaptechnology.jpa.domain.BaseEntity#hashCode()
*/
@Override
public int hashCode() {
final HashCodeBuilder hcb = new HashCodeBuilder();
hcb.append(getReceived());
hcb.append(getMessage());
hcb.append(getDevice());
return hcb.toHashCode();
}
/*
* (non-Javadoc)
*
* @see com.yaptechnology.jpa.domain.BaseEntity#toString()
*/
@Override
public String toString() {
ToStringBuilder tsb = new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE);
tsb.append("id", getId());
tsb.append("received", getReceived());
tsb.append("message", getMessage());
tsb.append("device", getDevice());
tsb.append("coordinates", getCoordinates());
tsb.append("version", getVersion());
return tsb.toString();
}
}
这在控制器中：
Device device = deviceService.findByKey("de305d54-75b4-431b-adb2-eb6b9e546014");
LOGGER.debug("device: {}", device);
DeviceEvent deviceEvent = new DeviceEvent(device);
deviceEvent.setCoordinates(new Coordinates((double)30.8340150, (double)2.3778850));
deviceEvent.setMessage("message");
deviceEventService.save(deviceEvent);
但是我保存时出现了这个错误
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'device_id' cannot be null
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:526)
com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
com.mysql.jdbc.Util.getInstance(Util.java:387)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:934)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3870)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3806)
com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2470)
com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2617)
com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2550)
com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2073)
com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2009)
com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5094)
com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1994)
org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:204)
org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:84)
org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:42)
org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2792)
org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3362)
org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:597)
org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:232)
org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:213)
org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:256)
org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:317)
org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:272)
org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:178)
org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:109)
org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.java:67)
org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:189)
org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:132)
org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58)
org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:775)
org.hibernate.internal.SessionImpl.persist(SessionImpl.java:748)
org.hibernate.internal.SessionImpl.persist(SessionImpl.java:753)
org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1146)
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:606)
org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:293)
com.sun.proxy.$Proxy107.persist(Unknown Source)
fr.telecom.dao.impl.AbstractDao.persist(AbstractDao.java:91)
fr.telecom.service.impl.DeviceEventServiceImpl.save(DeviceEventServiceImpl.java:25)
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:606)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
com.sun.proxy.$Proxy112.save(Unknown Source)
fr.telecom.controller.AppController.listDevices(AppController.java:63)
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:606)
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:118)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
答案 0 :(得分：1)
首先需要保存设备，以便可以将FK插入到device_event表中。您可以通过添加如下的级联选项让框架为您执行此操作。
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "device_id")
private Device device;