Question

我有一个senario，其中有实体文章，实体作者和连接表Article_Author。文章和作者有很多关系（关于文章可以有很多作者，作者可以有很多文章）。这是我的实体类：作者类：

@Entity
@Table(name="AUTHOR")
@NamedQuery(name="Author.findAll", query="SELECT a FROM Author a")
public class Author implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @Column(name="AUTHOR_CODE")
    private String authorCode;

    private String nom;

    //bi-directional many-to-many association to Article
    @ManyToMany(fetch=FetchType.EAGER)
    @JoinTable(
        name="ARTICLE_AUTHOR"
        , joinColumns={
            @JoinColumn(name="AUTHOR")
            }
        , inverseJoinColumns={
            @JoinColumn(name="ART_REF")
            }
        )
    private List<Article> article;
 }
 //getters and setters + hashcode and equals methods

文章类：

@Entity
@Table(name="ARTICLE_TEST")
@NamedQuery(name="ArticleTest.findAll", query="SELECT a FROM ArticleTest a")
public class ArticleTest implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @Column(name="ART_REF")
    private String artRef;

    @Column(name="ART_TITRE")
    private String artTitre;

    //bi-directional many-to-many association to AutheurTest
    @ManyToMany(mappedBy="articleTests", fetch=FetchType.EAGER)
    private List<AutheurTest> autheurTests;
  //getters and setters + hashcode and equals methods
}

以下是我创建文章并附加一位作者（用于测试）的代码：

            //.....
            AutheurTest aut1 = new AutheurTest();
            AutheurTest aut2 = new AutheurTest();

            aut1.setAutheurCode("1");
            aut1.setNom("AUT1");
            articlemodelBean.createautheurtest(aut1);
            ArticleTest art1 = new ArticleTest();           
            art1.setArtRef("A");
            art1.setArtTitre("ART1");       
            articlemodelBean.dmlArticle_test(art1,"insert"); //persist art1
            AutheurTest newaut = articlemodelBean.getAuteurActive_test(aut1.getAutheurCode());      

                ArticleTest  foundedart =  articlemodelBean.findArticle_test(art1.getArtRef()); //getting the article 

                foundedart.getAutheurTests().add(newaut);

                articlemodelBean.artaut(foundedart); //merge foudedart
        //.....

所以我没有收到任何错误，文章和作者都被添加到数据库中！但外键未插入连接表。所以基本上作者没有附在文章上。

jpa多对多子列表未持久

0 个答案: