JPA如何實現表自關聯
阿新 • • 發佈:2018-11-19
比如要實現如下自關聯效果
只需要註解 @OneToOne 即可,其他的不加
ex:
@Entity @Table(name="menu") public class Menu { @Id @GeneratedValue private long id; private String name; private String url; private String icon; @OneToOne private Menu parent; public long getId() { return id; } public void setId(long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getIcon() { return icon; } public void setIcon(String icon) { this.icon = icon; } public Menu getParent() { return parent; } public void setParent(Menu parent) { this.parent = parent; } @Override public String toString() { return "Menu{" + "id=" + id + ", name='" + name + '\'' + ", url='" + url + '\'' + ", icon='" + icon + '\'' + ", parent=" + parent + '}'; } }