我有这个存储库:
@Repository
public interface ProductRepository extends JpaRepository<Product, Long>{
@Query("SELECT p.textToSearch as text, count(*) as counter FROM Product p GROUP BY text_to_search ORDER BY counter DESC")
List<TopProductDTO> findTopProducts();
}
其中 TopProductDTO 类是:
public class TopProductDTO {
public TopProductDTO() {}
private String text;
private Integer counter;
// Getters and Setters are omited
}
但是当我执行代码时
List<TopProductDTO> topProducts = productRepository.findTopProducts();
它返回一个
List<Object[]> insted a List<TopProductDTO>
就像每一列都是列表中对象数组的索引一样......
Spring Data 不应该将查询中的“text”和“counter”列与 TopProductDTO 中的字段绑定吗?
结果我在我的 Thymeleaf 模板中遇到了这个错误:
00:37:22.659 [http-nio-8080-exec-5] ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "topProductDTO.text" (products/top:46)] with root cause
org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 14): Property or field 'text' cannot be found on object of type 'java.lang.Object[]' - maybe not public?
我正在使用 Spring Boot 1.3.3 和 Postgres 9.2