我有类 Money 这是一个@Embeddable
@Embeddable
public class Money implements Serializable, Comparable<Money> {
@Column(name = "amount", precision = 15, scale = 2)
private BigDecimal amount;
}
当我在实体内多次使用它时,一切正常。例如
@Entity
public class SomeEntity implements Serializable {
@Embedded
@AttributeOverride(name = "amount", column = @Column(name = "entry"))
private Money entryValue;
@Embedded
@AttributeOverride(name = "amount", column = @Column(name = "leave"))
private Money leaveValue;
}
上面的代码完美运行。
现在,当我有另一个 @Embeddable 我想在其中包含 Money 实例并且 @Embeddable 被实体多次使用时,就会出现问题。例子:
@Embeddable
public class ReportCostValues implements Serializable {
@Embedded
@AttributeOverride(name = "amount", column = @Column(name = "covered_by_grant"))
private Money coveredByGrant;
@Embedded
@AttributeOverride(name = "amount", column = @Column(name = "own_resources"))
private Money foundedFromOwnResources;
@Embedded
@AttributeOverride(name = "amount", column = @Column(name = "personal_contribution"))
private Money personalContribution;
@Entity
public class ReportCostEntity implements Identifiable<Long>, Serializable {
@Id
private Long id;
@Embedded
private ReportCostValues contracted;
@Embedded
private ReportCostValues current;
@Embedded
private ReportCostValues previousReport;
上面的这段代码不起作用。任何想法如何解决这个问题?
最佳答案
嗨,你必须使用 @AttributeOverrides
在司法上,您必须再次覆盖您在可嵌入 ReportCostValues
中所做的实体中的属性类,希望下面的代码是您正在寻找的。
@Entity
public class ReportCostEntity implements Serializable {
@Id
private Long id;
@Embedded
@AttributeOverrides( {
@AttributeOverride(name="coveredByGrant.amount", column = @Column(name="contracted_coveredByGrant") ),
@AttributeOverride(name="foundedFromOwnResources.amount", column = @Column(name="contracted_foundedFromOwnResources")),
@AttributeOverride(name="personalContribution.amount", column = @Column(name="contracted_personalContribution"))
} )
private ReportCostValues contracted;
@Embedded
@AttributeOverrides( {
@AttributeOverride(name="coveredByGrant.amount", column = @Column(name="current_coveredByGrant") ),
@AttributeOverride(name="foundedFromOwnResources.amount", column = @Column(name="current_foundedFromOwnResources")),
@AttributeOverride(name="personalContribution.amount", column = @Column(name="current_personalContribution"))
} )
private ReportCostValues current;
@Embedded
@AttributeOverrides( {
@AttributeOverride(name="coveredByGrant.amount", column = @Column(name="previousReport_coveredByGrant") ),
@AttributeOverride(name="foundedFromOwnResources.amount", column = @Column(name="previousReport_foundedFromOwnResources")),
@AttributeOverride(name="personalContribution.amount", column = @Column(name="previousReport_personalContribution"))
} )
private ReportCostValues previousReport;
}
希望这可以帮助 !!!!!
关于hibernate - Nested embeddable - 可嵌入的 AttributeOverride,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9845575/