Java Hibernate@Version注释和对象引用未保存的临时实例
我的新项目在Hibernate4.2.5.Final和Spring中。登录后,我将用户对象存储在会话中。 现在,在成功登录之后,我需要在应用程序日志中插入一条记录。以下是课程: 类BaseEntityJava Hibernate@Version注释和对象引用未保存的临时实例,java,hibernate,one-to-many,hibernate-mapping,many-to-one,Java,Hibernate,One To Many,Hibernate Mapping,Many To One,我的新项目在Hibernate4.2.5.Final和Spring中。登录后,我将用户对象存储在会话中。 现在,在成功登录之后,我需要在应用程序日志中插入一条记录。以下是课程: 类BaseEntity @MappedSuperclass public abstract class BaseEntity implements Serializable { private static final long serialVersionUID = 1L; @Id @Gene
@MappedSuperclass
public abstract class BaseEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long ID;
@Version
private Long version;
private Long createdBy;
@Temporal(value = TemporalType.TIMESTAMP)
private Date createdDate;
private Long updatedBy;
@Temporal(value = TemporalType.TIMESTAMP)
private Date updatedDate;
private String deactivatedReason;
private String activatedReason;
private Integer active;
public long getID() {
return ID;
}
public void setID(long iD) {
ID = iD;
}
public Long getVersion() {
return version;
}
public void setVersion(Long version) {
this.version = version;
}
public Long getCreatedBy() {
return createdBy;
}
public void setCreatedBy(Long createdBy) {
this.createdBy = createdBy;
}
public Date getCreatedDate() {
return createdDate;
}
public void setCreatedDate(Date createdDate) {
this.createdDate = createdDate;
}
public Long getUpdatedBy() {
return updatedBy;
}
public void setUpdatedBy(Long updatedBy) {
this.updatedBy = updatedBy;
}
public Date getUpdatedDate() {
return updatedDate;
}
public void setUpdatedDate(Date updatedDate) {
this.updatedDate = updatedDate;
}
public String getDeactivatedReason() {
return deactivatedReason;
}
public void setDeactivatedReason(String deactivatedReason) {
this.deactivatedReason = deactivatedReason;
}
public String getActivatedReason() {
return activatedReason;
}
public void setActivatedReason(String activatedReason) {
this.activatedReason = activatedReason;
}
public Integer getActive() {
return active;
}
public void setActive(Integer active) {
this.active = active;
}
}
类别用户:
package com.product.domain;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.validation.constraints.Pattern;
import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.NotBlank;
import com.product.audit.IAuditLog;
import com.product.domain.base.BaseEntity;
@Entity
@Table(name = "users")
@NamedQueries({ @NamedQuery(name = "Users.findUserByUserID", query = "SELECT usr FROM Users as usr WHERE usr.userName = ? and usr.practice.code = ?") })
public class Users extends BaseEntity implements IAuditLog {
private String userName;
private String password;
// bi-directional many-to-one association to Practice
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "practiceID")
private Practice practice;
//getters and setters
}
类应用程序事件:
package com.product.domain;
import java.util.Date;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name = "applicationevents")
public class ApplicationEvents {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long ID;
@Temporal(value = TemporalType.TIMESTAMP)
private Date eventDate;
private String comments;
private Integer eventType;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "practiceID")
private Practice practice;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "userID")
private Users userID;
//getters and setters
}
ApplicationEvents appEvent = new ApplicationEvents();
appEvent.setEventType(eventType);
appEvent.setPractice(practice);
appEvent.setUserID(userID);
appEvent.setComments(comments);
appEvent.setEventDate(new Timestamp(new Date().getTime()));
CRUDService.Save(appEvent);
尝试保存ApplicationEvent时,出现以下错误:
18:34:34.540 [http-bio-8080-exec-8] INFO c.p.a.MyUserDetailsService - Logged User authentication sucess. UserName admin and practice Name Physicians Choice Laboratory
Hibernate:
/* insert com.product.domain.ApplicationEvents
*/ insert
into
applicationevents
(comments, eventDate, eventType, practiceID, userID)
values
(?, ?, ?, ?, ?)
19 Sep, 2013 6:34:34 PM org.zkoss.bind.impl.ParamCall call:117
SEVERE:
org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the transient instance before flushing: com.product.domain.Users; nested exception is org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.product.domain.Users
at org.springframework.orm.hibernate4.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:166)
at org.springframework.orm.hibernate4.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:680)
at org.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:562)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:755)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:724)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:475)
非常重要的一点是:
当我删除基本实体中的@Version时,一切正常。首先需要保存用户
CRUDService.Save(userID);
然后将用户与ApplicationEvents关联
ApplicationEvents appEvent = new ApplicationEvents();
appEvent.setEventType(eventType);
appEvent.setPractice(practice);
appEvent.setUserID(userID);
appEvent.setComments(comments);
appEvent.setEventDate(new Timestamp(new Date().getTime()));
CRUDService.Save(appEvent);
我不想保存用户,因为没有更改。同样,userID是从login控制器获得的users类的对象。在应用程序事件表中,userID只是一个外键。非常重要的注意:当我删除基本实体中的@Version时,一切正常。我尝试了以下方法
users
对象确切来自何处?如果将用户从会话中拉出来,那么此时它将与持久性上下文分离,并被认为是暂时的。看见您需要对Users
对象执行merge
或saveOrUpdate
,以按照@Prabhakaran的建议将其重新附加到持久性上下文。让我重新声明。。。如果将Users
对象从会话中拉出而不是分离,则该对象是暂时的。分离的对象与临时对象略有不同。是的,用户对象来自会话,正如您所说,它处于临时状态。但我只是想知道,当我在baseentity中删除@version时,问题怎么不会发生?另外,我害怕使用saveupdate或merge保存用户对象,因为每个表都有审核日志。我真的害怕我的详细表。因为我的一个明细表包含与10多个主表相关的数据。所有这些都被称为细节表的外键,如果是这样的话,我需要先对所有10个主数据进行合并,然后保存细节表吗