Hibernate Annotations @Any 使用场景

使用hibernate时，你是否遇到如下蛋疼大场景

1@Entity
2@Table(name = "contr_Contract")
3@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
4@MetaData(value = "合同")
5public class Contract extends BaseEntity<Long> {
6	
7    @MetaData(value = "合同编号")
8    @EntityAutoCode
9    private String contrNo;
10    
11    @MetaData(value = "合同类型")
12    @EntityAutoCode
13    private ContrTypeEnum contrType;
14	
15    @MetaData(value = "销售合同")
16    private SaleContract saleContr;
17    
18    @MetaData(value = "代理合同")
19    private ProxyContract proxyContr;
20    
21    @MetaData(value = "租赁合同")
22    private LeaseContract leaseContr;
23    
24    @MetaData(value = "赠予合同")
25    private GiftContract giftContr;
26...............略.........................
27}

来吧 使用 Hibernate @any 

1@Any( metaColumn = @Column( name = "contr_class_type" ), fetch=FetchType.EAGER ,optional=true)
2    @AnyMetaDef( 
3        idType = "long", 
4        metaType = "string", 
5        metaValues = {
6            @MetaValue( value = "SALE", targetEntity = SaleContract.class),
7            @MetaValue( value = "PROXY", targetEntity = ProxyContract.class ),
8            @MetaValue( value = "LEASE", targetEntity = LeaseContract.class ),
9            @MetaValue( value = "GIFT", targetEntity = GiftContract.class ),
10        } )
11    @JoinColumn( name = "contr_id" )
12    @Index(name = "contr_id",columnNames={"contr_id"})
13	public ContractBaseEntity getContr() {
14		return contr;
15	}
16
17
18
19
20
21
22
23
24
25@Any ->
26metaColumn = @Column( name = "contr_class_type" ) 辨别类别 具体存的是
27@AnyMetaDef 定义的 @MeteValue.value 值