Question

我正在开发一个jpa项目。我的问题是，我的笔记本电脑忽略了@Column和@JoinColumn名称属性，但我的电脑没有。我不知道问题出在哪里...我已经清理并构建了项目（java maven项目，使用了eclipse链接2.5），但是他将id字段命名为数据库中的“ID”而不是“measureddata_id”。另一方面，在我的电脑上，他将id字段命名为“measureddata_id”（以其为工作）。

所以我假设，我的笔记本电脑忽略了我的实体中的@Column和@JoinColumn字段。

我笔记本电脑上的第二个是来自我的存储库的克隆，文件和依赖（依赖的版本号也是）完全相同。

以下是我的两个实体：

public class MeasuredDataEntity implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "measureddata_id")
    private Long id;

    @Column(nullable = false, updatable = false)
    @Temporal(javax.persistence.TemporalType.TIMESTAMP)
    private Date createTime;

    @JoinColumn(nullable = false)
    @OneToOne
    private WpsProcessEntity process;

    @OneToMany(fetch = FetchType.EAGER, cascade = {CascadeType.ALL})
    @JoinColumn(name = "owner_id", referencedColumnName = "measureddata_id")
    private List<AbstractQosEntity> data;

    public MeasuredDataEntity() {
        this.data = new ArrayList<AbstractQosEntity>();
    }

    public MeasuredDataEntity(List<AbstractQosEntity> qosEntities) {
        this.data = qosEntities;
        this.createTime = new Date();
    }

    public boolean add(AbstractQosEntity e) {
        return data.add(e);
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public WpsProcessEntity getProcess() {
        return process;
    }

    public void setProcess(WpsProcessEntity process) {
        this.process = process;
    }

    public List<AbstractQosEntity> getData() {
        return data;
    }

    public void setData(List<AbstractQosEntity> data) {
        this.data = data;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof MeasuredDataEntity)) {
            return false;
        }
        MeasuredDataEntity other = (MeasuredDataEntity) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();

        for (AbstractQosEntity e : data) {
            builder.append(e);
            builder.append("\n");
        }

        return builder.toString();
    }

}

第二个实体

@Entity
public abstract class AbstractQosEntity implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @Hide
    @GeneratedValue(strategy = GenerationType.AUTO)
    protected Long id;

    /*
    @Hide
    @OneToOne
    @JoinColumn(nullable = false)
    private MeasuredDataEntity owner;*/

    public abstract String getEntityName();

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof AbstractQosEntity)) {
            return false;
        }
        AbstractQosEntity other = (AbstractQosEntity) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "data.entity.AbstractQosEntity[ id=" + id + " ]";
    }
}

我很感谢你的帮助！

Answer 1

你的笔记本电脑上的eclipse链接版本怎么样？

带有Eclipse单向关系的JPA 2.0 @Column Annotation被忽略

1 个答案: