Question

我尝试使用hibernate创建一对一映射并保存SQL db，但是我运行我的项目我遇到了以下错误：

Initial SessionFactory creation failed.org.hibernate.AnnotationException: Unknown mappedBy in: mdl.Complaint.jobDone, referenced property unknown: mdl.JobDone.jobDone
Exception in thread "main" java.lang.ExceptionInInitializerError
    at config.HibernateUtil.buildSessionFactory(HibernateUtil.java:19)
    at config.HibernateUtil.<clinit>(HibernateUtil.java:8)
    at application.JD_Comp.main(JD_Comp.java:22)
Caused by: org.hibernate.AnnotationException: Unknown mappedBy in: mdl.Complaint.jobDone, referenced property unknown: mdl.JobDone.jobDone
    at org.hibernate.cfg.OneToOneSecondPass.doSecondPass(OneToOneSecondPass.java:159)
    at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1689)
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1396)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1829)
    at config.HibernateUtil.buildSessionFactory(HibernateUtil.java:13)
    ... 2 more

有我的映射类：

@Entity
@Table(name = "Complaint", catalog = "jobcard")
public class Complaint implements Serializable{
    private Integer complaint_id;
    private String nature;
    private String instruction;
    private JobDone jobDone;

    /**
     * @return the complaint_id
     */
    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "complaint_id", unique = true, nullable = false)
    public Integer getComplaint_id() {
        return complaint_id;
    }

    /**
     * @param complaint_id the complaint_id to set
     */
    public void setComplaint_id(Integer complaint_id) {
        this.complaint_id = complaint_id;
    }

    /**
     * @return the nature
     */
    public String getNature() {
        return nature;
    }

    /**
     * @param nature the nature to set
     */
    public void setNature(String nature) {
        this.nature = nature;
    }

    /**
     * @return the instruction
     */
    public String getInstruction() {
        return instruction;
    }

    /**
     * @param instruction the instruction to set
     */
    public void setInstruction(String instruction) {
        this.instruction = instruction;
    }

    /**
     * @return the jobDone
     */
    @OneToOne(fetch = FetchType.LAZY, mappedBy = "jobDone", cascade = CascadeType.ALL)
    public JobDone getJobDone() {
        return jobDone;
    }

    /**
     * @param jobDone the jobDone to set
     */
    public void setJobDone(JobDone jobDone) {
        this.jobDone = jobDone;
    }

}

其他课程：

@Entity
@Table(name = "JobDone", catalog = "jobcard", uniqueConstraints = {
        @UniqueConstraint(columnNames = "nature"),
        @UniqueConstraint(columnNames = "amount") })
public class JobDone implements Serializable{
    private Integer jobDone_id;
    private String nature;
    private Integer amount;
    private Complaint complaint;

    /**
     * @return the jobDone_id
     */
    @GenericGenerator(name = "generator", strategy = "foreign", parameters = @Parameter(name = "property", value = "Complaint"))
    @Id
    @GeneratedValue(generator = "generator")
    @Column(name = "jobDone_id", unique = true, nullable = false)
    public Integer getJobDone_id() {
        return jobDone_id;
    }

    /**
     * @param jobDone_id the jobDone_id to set
     */
    public void setJobDone_id(Integer jobDone_id) {
        this.jobDone_id = jobDone_id;
    }

    /**
     * @return the nature
     */
    public String getNature() {
        return nature;
    }

    /**
     * @param nature the nature to set
     */
    public void setNature(String nature) {
        this.nature = nature;
    }

    /**
     * @return the amount
     */
    public Integer getAmount() {
        return amount;
    }

    /**
     * @param amount the amount to set
     */
    public void setAmount(Integer amount) {
        this.amount = amount;
    }

    /**
     * @return the complaint
     */
    @OneToOne(fetch = FetchType.LAZY)
    @PrimaryKeyJoinColumn
    public Complaint getComplaint() {
        return complaint;
    }

    /**
     * @param complaint the complaint to set
     */
    public void setComplaint(Complaint complaint) {
        this.complaint = complaint;
    }
}

SQL查询：

CREATE DATABASE jobcard;
USE jobcard;
CREATE TABLE Complaint(
    jobNumber varchar(100),
    complaint_id int(10) primary key NOT NULL AUTO_INCREMENT,
    nature varchar(200),
    instruction varchar(200),
    constraint foreign key(jobNumber) references JobCard(jobNumber) 
    on delete cascade on update cascade  
);

CREATE TABLE JobDone(
    complaint_id int(10),
    jobDone_id int(10) primary key NOT NULL AUTO_INCREMENT,
    nature varchar(200),
    amount int,
    constraint foreign key(complaint_id) references Complaint(complaint_id) 
    on delete cascade on update cascade     
);

我创建了hibernate.cfg.xml文件，并将两个类都映射到了完全限定的类名。为什么我收到这个错误。

更新

它的工作

投诉类：

@OneToOne(fetch = FetchType.LAZY)
@PrimaryKeyJoinColumn
public JobDone getJobDone() {
    return jobDone;
}

JobDone类：

@OneToOne(fetch = FetchType.LAZY, mappedBy = "jobDone", cascade = CascadeType.ALL)
public Complaint getComplaint() {
    return complaint;
}

Answer 1

显然，问题是您在jobDone中没有财产JobDone。您可以使用此映射

public class Compilant {

    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    public JobDone getJobDone() {
        return jobDone;
    }

}

Complaint到JobDone会有一个外键。您可以从Compilant删除JobDone属性。

如果您想在JobDone与Complaint之间建立关联（这不太方便）

public class JobDone {

   @OneToOne(fetch = FetchType.LAZY)
   public Complaint getComplaint() {
        return complaint;
    }

}

如果您只想在JobDone

中拥有外键

public class Compilant {

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "complaint" cascade = CascadeType.ALL)
    public JobDone getJobDone() {
        return jobDone;
    }

}

public class JobDone {

   @OneToOne(fetch = FetchType.LAZY)
   public Complaint getComplaint() {
        return complaint;
    }

}

Answer 2

这是因为您在一个地方（小j）使用 jobDone 而在其他地方（大写J）使用 JobDone 。纠正这个问题应该去。

org.hibernate.AnnotationException：未知的mappedBy in：mdl.Complaint.jobDone，引用的属性unknown：mdl.JobDone.jobDone

2 个答案: