spring-data-jpa 查询视图，报错，找不到table或者视图！花了一天的时间在网上找了一份资料，亲测后分享给大家，参见：参考资料。

• Controller层

@RestController
@RequestMapping("/api")
@ComponentScan
public class UserCertificationController extends BaseController {@Autowiredprivate UserCertificationService userCerService;/*** 视图查询Demo，返回值data* * @return {"data":[{"id":"1","user_name":"mo","userid":"mo101"}],"code":"200","msg":"success"}*/@RequestMapping(value = "/findKdOrView", method = RequestMethod.GET)public String findKdOrView() {List<KdOrView> vlist = this.userCerService.findKdByNativeSQL();return renderSuccess(vlist);}
}

• Service层

ObjectDaoService 是共通

ObjectDaoService.java

public interface ObjectDaoService {EntityManager getEntityManager();
}

ObjectDaoServiceImpl.java

@Service
public class ObjectDaoServiceImpl implements ObjectDaoService {@PersistenceContextprivate EntityManager entityManager;@Overridepublic EntityManager getEntityManager(){return this.entityManager;}}

业务逻辑层

UserCertificationService

@Service
public interface UserCertificationService {public List<KdOrView> findKdByNativeSQL();}

UserCertificationServiceImpl

@Service
public class UserCertificationServiceImpl implements UserCertificationService {@Resourceprivate ObjectDaoService objectDaoService;public List<KdOrView> findKdByNativeSQL() {// 1.组织sql语句，这里设置参数 ":id" 方式，还有一种是 "?1,?2"，需要指定String sql = "select id,user_name,userid from kdorview k where k.id = :id";// 2.创建实体管理对象EntityManager entityManager = objectDaoService.getEntityManager();// 3.使用jpa 包装查询，获取query 对象Query query = entityManager.createNativeQuery(sql);// 4.再使用去包装查询获取 nativeQuery 对象SQLQuery nativeQuery = query.unwrap(SQLQuery.class);// 5.设置参数，对应上面的参数 ":id"nativeQuery.setParameter("id", "1");// 设置返回值类型Map，然后对Map进行处理。nativeQuery.setResultTransformer(CriteriaSpecification.ALIAS_TO_ENTITY_MAP);// 6.执行查询，获取viewlistList<KdOrView> viewlist = new ArrayList<KdOrView>();// 解析viewlist，根据功能逻辑封装@SuppressWarnings("unchecked")List<Map<String, Object>> retVal = nativeQuery.list();if (retVal != null && retVal.size() > 0) {for (Map<String, Object> map : retVal) {KdOrView kv = new KdOrView();// key字段全部要大写，这里使用的是oracle数据库kv.setId(map.get("ID").toString());kv.setUser_name(map.get("USER_NAME").toString());kv.setUserid(map.get("USERID").toString());viewlist.add(kv);}}return viewlist;}

• Domain

// domain 中不需要任何的注解，这是一个映射到视图的enity,并没有真实的表。
public class KdOrView implements Serializable {/*** */private static final long serialVersionUID = 1L;// KD Table Fieldprivate String id;private String user_name;// Or Table Fieldprivate String userid;public KdOrView() {}public KdOrView(String id, String user_name, String userid) {this.id = id;this.user_name = user_name;this.userid = userid;}// GET SET....... 省略}

• DB View:kdorView  视图结构。

• 备注：

1. 中间因为想把view当做table使用，创建了接口Repository，但是总会报错找不到表或者视图。

2. 使用

3. @Override  public List<Report> getReport() {  String jpql= String.format("select new %3$s(a.deptId, a.deptName, (select count(*) from %2$s b where b.deptId= a.deptId) as totalCount) from %1$s a",  Depts.class.getName(),  Students.class.getName(),  Report.class.getName());  EntityManager entityManager= objectDaoService.getEntityManager();  //建立有类型的查询  TypedQuery<Report> reportTypedQuery= entityManager.createQuery(jpql, Report.class);  //另外有详细查询条件的在jpql中留出参数位置来(?1 ?2 ?3....)，然后在这设置  //reportTypedQuery.setParameter(1, params);  List<Report> reports= reportTypedQuery.getResultList();  return reports;  }

4. 上面这种方法时候也总是提示no pressi......

• 参考资料：

http://blog.csdn.net/chaijunkun/article/details/8442406