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当使用方法访问属性时,如何使用@AttributeOverrides?

hibernate java

Kirill · 技术社区 · 8 年前

到属性。它工作得很好,直到在另一个类中有两个或多个包含,其中我必须使用@AttributeOverrides。

在这种情况下,我从Hibernate收到以下错误:

映射为插入=“false”更新=“false”)

由于某些原因,Hibernate似乎不理解方法访问。若我使用公共属性访问,一切正常,但我需要当前属性从XMLGregorianCalendar字段获取日历日期。

@Embeddable
@Access(AccessType.FIELD)
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "...")
public class GrnType {

    @XmlAttribute(name = "...")
    @Transient
    protected String grn;

    @XmlAttribute(name = "...", required = true)
    @Transient
    protected XMLGregorianCalendar dateOfEntry;

    @Transient
    private Calendar calendarDate;


    @Access(AccessType.PROPERTY)
    @Column(name = "grn")
    public String getGrn() {
        return grn;
    }

    @Access(AccessType.PROPERTY)
    @Column(name = "grn_date")
    private Calendar getCalendarDate() {
         if(dateOfEntry!=null) {
             return new GregorianCalendar(dateOfEntry.getYear(), dateOfEntry.getMonth(), dateOfEntry.getDay());
         }else {
             return null;
         }
    }

    //   ...setters here

}

嵌入的类:

@Entity
@Table(name="RealEstateDFl")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {...})
public class GrnEntity {

    //...
    @Embedded
    @AttributeOverrides({
            @AttributeOverride(name = "grn", column = @Column(name = "grn_main")),
            @AttributeOverride(name = "grn_date", column = @Column(name = "grn_date_main"))
    })
    protected GrnType grnType;

    @Embedded
    @AttributeOverrides({
            @AttributeOverride(name = "grn", column = @Column(name = "grn_sec")),
            @AttributeOverride(name = "grn_date", column = @Column(name = "grn_date_sec"))
    })
    protected GrnType grnTypeSecondary;

    //...
}

1 回复 | 直到 8 年前

Kirill 8 年前

我找到了解决办法。这对我来说相当棘手。

不是列的名称,而是变量的名称 日历日期 .

@Entity
@Table(name="RealEstateDFl")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {...})
public class GrnEntity {

    //...
    @Embedded
    @AttributeOverrides({
            @AttributeOverride(name = "grn", column = @Column(name = "grn_main")),
            @AttributeOverride(name = "calendarDate", column = @Column(name = "grn_date_main"))
    })
    protected GrnType grnType;

    @Embedded
    @AttributeOverrides({
            @AttributeOverride(name = "grn", column = @Column(name = "grn_sec")),
            @AttributeOverride(name = "calendarDate", column = @Column(name = "grn_date_sec"))
    })
    protected GrnType grnTypeSecondary;

    //...
}

此外,可嵌入类中的getter和setter应该与属性名完全匹配。