Question

我不知道问题是什么以及如何解决这个问题。我有Articles和Images，它们被映射多对多。

@Entity
@Table(name="Article")
public class Article {
    @Id
    @GeneratedValue
    private int articleId;
    private String createDate;
    private int state;
    @ManyToMany(cascade = CascadeType.ALL, mappedBy="articles")
    private Set<Image> images = new HashSet<Image>();

//setters and getters
}

和

@Entity
@Table(name="Image")
public class Image {
    @Id
    @GeneratedValue
    private int imageId;
    private String imagePath;
    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(name = "ArticleImage", 
           joinColumns = { @JoinColumn(name = "articleId") }, 
           inverseJoinColumns = { @JoinColumn(name = "imageId") })
    private Set<Article> articles = new HashSet<Article>();

//setters and getters
}

这是我映射的2个表。我在数据库中也有一个表：ArticleImage articleId和imageId。

在我的控制器中，当我创建article对象和image对象时，我可以毫无问题地保存它们，但如果我尝试在image中设置article，我会得到一个错误：

org.springframework.dao.DataIntegrityViolationException: Could not execute JDBC batch update; SQL [insert into ArticleImage (articleId, imageId) values (?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
Caused by: org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
Caused by: java.sql.BatchUpdateException: Cannot add or update a child row: a foreign key constraint fails (`appdatabase`.`articleimage`, CONSTRAINT `fk_ArticleImage_Article1` FOREIGN KEY (`articleId`) REFERENCES `article` (`articleId`) ON DELETE NO ACTION ON UPDATE NO ACTION)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`appdatabase`.`articleimage`, CONSTRAINT `fk_ArticleImage_Article1` FOREIGN KEY (`articleId`) REFERENCES `article` (`articleId`) ON DELETE NO ACTION ON UPDATE NO ACTION)

我尝试设置所有内容并保存到数据库但是我收到错误。我还尝试将article和image保存到数据库中（不在图片中设置文章并且它正常工作）。然后在article中设置image，然后更新image，但我收到错误。

我应该如何处理？

编辑：

Article article = new Article();
article.setCreateDate(dateFormat.format(date));  
article.setState(1);
articleService.create(article);

Image img = new Image();
img.setImagePath(path);
imageService.create(img);

Set<Article> articles = new HashSet<Article>();
articles.add(article);
img.setArticles(articles);
imageService.update(img);

我也尝试设置所有内容然后创建它们。

我的道是这样的：

public void create(Article article) {
    session().save(article);
}

Answer 1

似乎问题不在代码中。它在我的数据库中。我在Article和Image中有一些条目，我认为这就是我收到错误的原因。我所做的只是再次从工作台创建我的数据库，我的表中没有条目，现在它正在工作:)。

Hibernate多对多无法添加或更新子行：外键约束失败

1 个答案: