switchyard jpa hibernate 实体管理器 NamedQuery答案

【问题标题】：switchyard jpa hibernate entity manager NamedQueryswitchyard jpa hibernate 实体管理器 NamedQuery
【发布时间】：2014-09-06 18:28:58
【问题描述】：

有没有人可以提供一个使用注入引用类的开关场服务示例：

@PersistenceContext 私有实体管理器实体管理器；

一个使用@NamedQueries 的例子会很好。

你好！

【问题讨论】：

标签： hibernate jpa named-query

【解决方案1】：

将 Bean 绑定与您可以创建的服务一起使用。以下是使用 REST 的示例

 /**
 * This is the rest interface for Switchyard This interface
 *         contains the services which are exposed 
 */

Interface VendorRestService.java
@Path("/vendorDetails")
public interface VendorRestService {

@GET
    @Path("/vendorPriceDetails")
    @Produces({ MediaType.APPLICATION_JSON })
    public Response<List<String>> getAllPriceDetails(
            @QueryParam("vendorId") String vendorId,
            @QueryParam("location") String location);

}

VendorService.java

public interface VendorService {
    Response<List<String>> getAllPriceDetails(VendorRequest request);
}

VendorRequest.java

public class VendorRequest  {


    @JsonProperty("vendorId")
    private String vendorId;

    @JsonProperty("location")
    private String location;

    getters/setters
    }

Bean 实现类 VendorServiceBean.java

@Service(VendorService.class)
public class VendorServiceBean implements VendorService {
@Override
    public Response<List<String>> getAllPriceDetails(VendorRequest request) {
        .
        .
        .

        priceList = vendorFacade.getPriceByVendor(request.getVendorId(),request.getLocation());
        .
        .
        .
        return Response;
    }
    }

Facade层的实现类VendorFacadeImplementation.java

public class VendorFacadeImplementation implements VendorFacade {

@Inject
private EntityManager em;

    @Override
    public List<String> getPriceByVendor(String vendorId,
            String location) {
            try{
            query = em
                    .createNamedQuery("VendorData.getVendorPriceDetails");
            query.setParameter("vendorId", vendorId);
            query.setParameter("location", location);
            List<String> priceList = query.getResultList();
            }catch(Exception ex){

            }


            return priceList;

            }

模型类。将DB表映射到java类

@Entity
@Table(name = "VendorData")
@NamedQueries({ 
    @NamedQuery(name = "VendorData.getVendorPriceDetails", query = "select vd.price from VendorData vd where vd.vendorId = :vendorId and vd.location = :location"))}
    public class VendorData implements java.io.Serializable {   


}   



/*Expose an entity manager using the resource producer pattern*/
 Resources.java
 public class Resources {

    /*Expose an entity manager using the resource producer pattern*/

    @PersistenceContext
    @Produces
    private EntityManager em;

    }

【讨论】：