使用多对一关系，我得到了org.h2.jdbc.JdbcSQLException：唯一索引或主键冲突

Question

我有两个表：学习和诊断，每个研究都有一个独特的诊断，并且诊断＆＃39;名称是唯一的，我的代码是：

@Data
@Entity
@Table(name = "diagnosis")
public class Diagnosis {
    @Id
    @GeneratedValue(strategy =GenerationType.AUTO)
    private Integer id;

    @Column(unique = true)
    private String name;

    @Column
    private String stage;

    @Column
    private String description;

}

研究是：

@Data
@Entity
@Table(name = "study")
public class Study {

    @Id
    @Column
    private Double uid;

    @Column
    private String manufacture;

    @Column
    private Date study_datatime;

    @ManyToOne(cascade = {CascadeType.PERSIST})
    @JoinColumn(name = "diagnosis_id")
    private Diagnosis diagnosis;

}

但我得到了异常：org.h2.jdbc.JdbcSQLException：唯一索引或主键违规：＆＃34; CONSTRAINT_INDEX_E ON PUBLIC.DIAGNOSIS（NAME）VALUES（＆＃39;正常＆＃39;，1）＆ ＃34; 我使用H2数据库1.4.190，我不知道原因。

示例测试：

    public static void main(String[] args) throws Exception{
        Diagnosis diagnosis=new Diagnosis();
        diagnosis.setName("normal");

        Study study=new Study();
        Study study1=new Study();
        study.setDiagnosis(diagnosis);
        study.setUid(1.0);

        study1.setDiagnosis(diagnosis);
        study1.setUid(2.0);

        SessionFactory sessionFactory=new     Configuration().configure().buildSessionFactory();
        Session session=sessionFactory.openSession();
        Transaction transaction=session.beginTransaction();
        session.persist(study);
        session.persist(study1);
        transaction.commit();
        session.clear();
        session.close();
}

实际代码：

    ....
    diagnosisName = row.getCell(6).getStringCellValue();
    if (diagnosisNameMap.keySet().contains(diagnosisName) == false)
      {
       diagnosis.setName(diagnosisName);
       diagnosisNameMap.put(diagnosisName,diagnosis);
       study.setDiagnosis(diagnosis);
       session.persist(diagnosis);
      }else{
       diagnosis=diagnosisNameMap.get(diagnosisName);
       study.setUid(Double.parseDouble(row.getCell(0).toString()));
       study.setDiagnosis(diagnosis);
     }

     session.persist(study);