Question

我想使用公式注释

获取实体对象

@Formula(value="(select ar from article ar where ar.id=1)")
private Article article;

尝试了很多方法。请帮忙

线程“main”中的异常org.hibernate.MappingException：无法确定：com.test.bean.Article的类型，在表：Menu，对于列：[org.hibernate.mapping.Formula（（select ar from article ar其中ar.id = 1））]

异常似乎说它无法解析类型

更新实体

   @Entity
    public class Menu {

        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        private Integer id;

        // @Formula(value="article.id=1")
        // @JoinColumnOrFormula(formula=@JoinFormula("(select ar from article ar where ar.id=1)"),column=@JoinColumn(insertable=false,updatable=false))
        // @Transient 
        // @OneToOne(fetch=FetchType.EAGER,targetEntity=Article.class)
        // @JoinColumn(insertable=false,updatable=false,columnDefinition="(select ar from article ar where ar.id=1)")
        @Formula(value = "(SELECT ar.id from article ar where ar.id=1)")
//      @OneToOne(targetEntity=Article.class,fetch=FetchType.EAGER)
//      @Fetch(FetchMode.SELECT)
        private Article article;

        @Formula(value = "(SELECT count(*) from article ar where ar.id=1)")
        private Integer count;


        public Integer getId() {
            return id;
        }

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

        public Article getArticle() {
            return article;
        }

        public void setArticle(Article article) {
            this.article = article;
        }

        public Integer getCount() {
            return count;
        }

        public void setCount(Integer count) {
            this.count = count;
        }

        @Override
        public String toString() {
            return "Menu [id=" + id + ", article=" + article + ", count=" + count
                    + "]";
        }

    }


    @Entity(name = "article")
    public class Article {

        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        private Integer id;

        private String uid;

        private String content;

        public Integer getId() {
            return id;
        }

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

        public String getUid() {
            return uid;
        }

        public void setUid(String uid) {
            this.uid = uid;
        }

        public String getContent() {
            return content;
        }

        public void setContent(String content) {
            this.content = content;
        }

        @Override
        public String toString() {
            return "Article [id=" + id + ", uid=" + uid + ", content=" + content
                    + "]";
        }

    }

cfg还包含映射。

Answer 1

我遇到了同样的问题，以下就是我用来解决它的问题虽然我可以在发布的代码中看到相同的内容，但它对我有用。

@ManyToOne
    @JoinColumnsOrFormulas({
            @JoinColumnOrFormula(formula=@JoinFormula(value="(<YOUR_QUERY>)", referencedColumnName="id")),
    })
private Article article;

@formula获取实体对象

1 个答案: