Question

我正在尝试将返回的JPA本机查询结果映射到未映射的Java POJO类并使用@ConstructorResult如下：

@SqlResultSetMapping(name = "productDetailResult", classes = {
   @ConstructorResult(targetClass = com.rjil.mhood.jiostore.bo.ProductDetailBO.class,
   columns = {
@ColumnResult(name = "iconId", type = Integer.class),
@ColumnResult(name = "thumbnailId", type = Integer.class),
@ColumnResult(name = "screenshotId1", type = Integer.class),
@ColumnResult(name = "screenshotId2", type = Integer.class),
@ColumnResult(name = "screenshotId3", type = Integer.class),
@ColumnResult(name = "screenshotId4", type = Integer.class),
@ColumnResult(name = "screenshotId5", type = Integer.class),
@ColumnResult(name = "name", type = String.class),
@ColumnResult(name = "description", type = String.class),
@ColumnResult(name = "downloadcount", type = BigDecimal.class),
@ColumnResult(name = "artifactSize", type = String.class),
@ColumnResult(name = "creationDate", type = Date.class),
@ColumnResult(name = "updatedDate", type = Date.class),
@ColumnResult(name = "price", type = BigDecimal.class),
@ColumnResult(name = "downloadUrl", type = String.class),
@ColumnResult(name = "contentProviderName", type = String.class) }) })

和POJO类是：

public class ProductDetailBO {

    private Integer iconId;
    private Integer thumbnailId;
    private Integer screenshotId1;
    private Integer screenshotId2;
    private Integer screenshotId3;
    private Integer screenshotId4;
    private Integer screenshotId5;
    private String name;
    private String description;
    private BigDecimal downloadCount;
    private String artifactSize;
    private Date creationDate;
    private Date updatedDate;
    private BigDecimal price;
    private String downloadUrl;
    private String contentProviderName;

    public ProductDetailBO() {

    }

    public ProductDetailBO(Integer iconId, Integer thumbnailId,
            Integer screenshotId1, Integer screenshotId2,
            Integer screenshotId3, Integer screenshotId4,
            Integer screenshotId5, String name, String description,
            BigDecimal downloadCount, String artifactSize, Date creationDate,
            Date updatedDate, BigDecimal price, String downloadUrl,
            String contentProviderName) {
        this.iconId = iconId;
        this.thumbnailId = thumbnailId;
        this.screenshotId1 = screenshotId1;
        this.screenshotId2 = screenshotId2;
        this.screenshotId3 = screenshotId3;
        this.screenshotId4 = screenshotId4;
        this.screenshotId5 = screenshotId5;
        this.name = name;
        this.price = price;
        this.creationDate = creationDate;
        this.updatedDate = updatedDate;
        this.description = description;
        this.downloadCount = downloadCount;
        this.artifactSize = artifactSize;
        this.downloadUrl = downloadUrl;
        this.contentProviderName = contentProviderName;

    }


}

POJO类包含匹配的构造函数，但query.getResultList()返回Object数组。

我希望ProductDetailBO像这样：

ProductDetailBO bo = query.getResultList("query","ProductDetailBO").get(0);

我该怎么做？

Answer 1

我刚刚在我的项目中执行了类似的映射到未实现的pojo。问题是你应该在创建查询时指向SqlResultSetMapping的名称，所以在你的情况下它应该是这样的：

final Query query = entityManager.createNativeQuery(queryString, "productDetailResult");

然后像：

final List<ProductDetailBO> result = Collections.checkedList(query.getResultList(), ProductDetailBO.class);

jpa 2.1中的@ConstructorResult映射

1 个答案: