json - 使用JEST将ElasticSearch结果映射到JPA实体

Question

我在应用程序中实现搜索功能，在其中搜索数据库中的记录。我为此使用ElasticSearch，我知道我必须保持数据库和索引同步。我将在应用程序层进行处理。

我的问题更多是关于从我的J2EE 7应用程序查询ElasticSearch。我可以从查询中获取JsonObject或JsonArray，然后使用Gson库及其JsonObject和JsonArray类“手动解析”它，但效率不高。

根据我的阅读，使用GSON解析的最佳实践是拥有一个与您的Json对象具有相同结构的POJO。我可以这样做，但是此POJO与我的JPA实体非常相似，因此我将在两个地方拥有相同的信息，这将使维护变得更加困难。我一直无法使它无缝运行，但是我想尝试另一种方法。

所以我的问题是，是否可以将json对象映射到JPA实体，更重要的是，这是一种好习惯吗？

这是我的JSON(变量名称可以更改，我知道它们现在不匹配):

        {
           "vendorEcommerce": 1,
           "Categories": {
              "Sub": [
                 4,
                 8,
                 5
              ],
              "Main": [
                 1,
                 2
              ]
           },
           "Countries": 1,
           "vendorFeatured": 1,
           "vendorWebsite": "www.johndoesserviceprovider.com",
           "vendorEmail": "johndoe@gmail.com",
           "vendorCreated": "2015-02-25T17:00:13.000Z",
           "vendorName": "John Doe's Service Provider",
           "vendorLocation": 1,
           "vendorRating": 1,
           "States": [
              1,
              2
           ],
           "vendorUpdated": "2015-02-25T17:00:13.000Z",
           "vendorPhone": "+11235551234",
           "vendorDescription": "This is John Doe's Service Provider Description",
           "vendorPromotion": "Oh yeah",
           "vendorPrice": 3
        }

这是我的JPA实体(忽略了相关信息):

public class VendorEntity implements Serializable {
    private static final long serialVersionUID = 1L;

    private Integer vendorId;
    private Date vendorCreated;
    private Date vendorUpdated;
    private String vendorName;
    private String vendorWebsite;
    private String vendorPhone;
    private String vendorEmail;
    private String vendorDescription;
    private Boolean vendorEcommerce;
    private Integer vendorRating;
    private Integer vendorPrice;
    private String vendorPromotion;
    private Boolean vendorFeatured;
    private LocationEntity location;
    private List<ServiceCategoryEntity> categories;
    private List<VendorCoverageEntity> coverages;
}

Answer 1

您可以将Spring Data Elasticsearch与JPA一起使用。

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(excludeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = ElasticsearchCrudRepository.class))
@EnableElasticsearchRepositories(includeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = ElasticsearchCrudRepository.class))
public class DataConfiguration {
    ...
}

实体示例:

@Entity
@Table(name="learn_author")
@Document(indexName = "blogging", type = "author", shards = 1, replicas = 0)
public class Author implements Serializable {

    @org.springframework.data.annotation.Id
    @Id
    @GeneratedValue(strategy= GenerationType.SEQUENCE)
    @Column(name="id")
    private Long id;

    @Column(name="username")
    private String username;

    @Field(type = FieldType.String,
        searchAnalyzer = "standard",
        indexAnalyzer = "standard",
        store = true)
    @Column(name="fullname")
    private String fullname;

    ...

}

click here的完整示例