spring mvc 3和hibernate中的多对一映射
我有两张桌子: 编写器:编写器id(主键,自动递增),编写器名称(varchar) 文章:文章id(主键,自动递增),文章名称(varchar),作者id(fk,int) 一个作者可以有多篇文章。因此,从文章到作者的映射是多对一的 以下是我的文章模型:spring mvc 3和hibernate中的多对一映射,hibernate,spring-mvc,Hibernate,Spring Mvc,我有两张桌子: 编写器:编写器id(主键,自动递增),编写器名称(varchar) 文章:文章id(主键,自动递增),文章名称(varchar),作者id(fk,int) 一个作者可以有多篇文章。因此,从文章到作者的映射是多对一的 以下是我的文章模型: @Entity @Table(name = "articles") public class Article { @Id @GeneratedValue @Column(name = "article_id") priva
@Entity
@Table(name = "articles")
public class Article {
@Id
@GeneratedValue
@Column(name = "article_id")
private Long articleId;
@Column(name = "article_name", nullable = false, length=20)
private String articleName;
private Writer writer;
public Writer getWriter() {
return writer;
}
public void setWriter(Writer writer) {
this.writer = writer;
}
//rest of setters and getters
}
writer属性的注释是什么
这是我的控制器类:
public class ArticleController {
@Autowired
private ArticleService articleService;
@RequestMapping(value = "/add", method = RequestMethod.GET)
public ModelAndView addArticle(@ModelAttribute("article") Article article,BindingResult result) {
return new ModelAndView("addArticle");
}
@RequestMapping(value = "/save", method = RequestMethod.POST)
public ModelAndView saveArticle(@ModelAttribute("article") Article article,BindingResult result) {
articleService.addArticle(article);
return new ModelAndView("redirect:/articles/list");
}
}
在我的addArticle.jsp页面中,我在一个选择框中填充了writers(该框的值为writer\u id,标签为writer\u name)
请告诉我。这里有一个选项,其他选项可用:
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "writer_fk", nullable = false)
private Writer writer;
在writer中,你可以
@OneToMany(mappedBy = "writer")
private Set<Article> articles= new HashSet<Article>();
@OneToMany(mappedBy=“writer”)
private Set articles=new HashSet();
这里有一个选项,其他选项可用:
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "writer_fk", nullable = false)
private Writer writer;
在writer中,你可以
@OneToMany(mappedBy = "writer")
private Set<Article> articles= new HashSet<Article>();
@OneToMany(mappedBy=“writer”)
private Set articles=new HashSet();
谢谢,但在saveArticle方法中,我必须设置article.setWriter(writer)还是将其绑定到文章(模态属性)?谢谢,但在saveArticle方法中,我必须设置article.setWriter(writer)还是将其绑定到文章(模态属性)?