【转】hibernate annotation方式配置实体关联关系，解决关联外键数据不存在时抛出异常的问题...

使用hibernate 注解配置实体类的关联关系，在many-to-one,one-to-one关联中，一边引用自另一边的属性，如果属性值为某某的数据在数据库不存在了，hibernate默认会抛出异常。解决此问题，加上如下注解就可以了：

@NotFound(action=NotFoundAction.IGNORE)，意思是找不到引用的外键数据时忽略，NotFound默认是exception

 1 @Entity
 2 @Table(name = "ICT_COMPUTER_LOCATION")
 3 public class IctComputerLocation {
 4     private static final long serialVersionUID = 1L;
 5 
 6     private Integer id;
 7     /** IDC编号 */
 8     private String idcNum;
 9 
10     private Integer ictBaseId;
11 
12     /** IctBase实体类 */
13     private IctBase ictBase;
14 
15     @Id
16     @GeneratedValue(strategy = GenerationType.AUTO)
17     @Column(name = "ID")
18     public Integer getId() {
19         return id;
20     }
21 
22     public void setId(Integer id) {
23         this.id = id;
24     }
25 
26     @Column(name = "IDC_NUM")
27     public String getIdcNum() {
28         return idcNum;
29     }
30 
31     public void setIdcNum(String idcNum) {
32         this.idcNum = idcNum;
33     }
34 
35     @Column(name = "ICT_BASE_ID")
36     public Integer getIctBaseId() {
37         return ictBaseId;
38     }
39 
40     public void setIctBaseId(Integer ictBaseId) {
41         this.ictBaseId = ictBaseId;
42     }
43 
44     @ManyToOne(fetch = FetchType.LAZY)
45     @JoinColumn(name = "ICT_BASE_ID", referencedColumnName = "ID", unique = false, nullable = false, insertable = false, updatable = false)
46     @NotFound(action=NotFoundAction.IGNORE)
47     public IctBase getIctBase() {
48         return ictBase;
49     }
50 
51     public void setIctBase(IctBase ictBase) {
52         this.ictBase = ictBase;
53     }

 

转载于:https://www.cnblogs.com/blog-mhxy/p/3447599.html