CrudRepository中的自定义SQL查询
我试图在扩展CrudRepository的存储库中执行一些SQL查询。我在控制器中有以下代码:
@CrossOrigin(origins = "*") @GetMapping(path="/all")
public @ResponseBody List<UserProjection> getAllRequestResponseRecords() {
return userRequestResponseRepository.findAllProjectedBy() ;
}
DAO代码如下:
public interface UserRequestResponseRepository extends CrudRepository<UserRequestResponse, Integer> { //public static final String FIND_QUERY = "select user.u_httpstatus ,user.u_queryparam from UserRequestResponse user";
public static final String FIND_QUERY =
"select new com.abc.datacollection.entity.UserRequestResponse(user.u_httpstatus ,user.u_queryparam) from UserRequestResponse user";
@Query(value = FIND_QUERY)
//public List<UserProjection> getAllRequestResponseRecords();
List<UserProjection> findAllProjectedBy();
}
该类是:
import java.sql.Date;import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity // This tells Hibernate to make a table out of this class
public class UserRequestResponse {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private String u_httpstatus;
private String u_error_message;
private String u_queryparam;
public UserRequestResponse(String u_httpstatus, String u_queryparam) {
this.u_httpstatus = u_httpstatus;
this.u_queryparam = u_queryparam;
}
public String getU_httpstatus() {
return u_httpstatus;
}
public void setU_httpstatus(String u_httpstatus) {
this.u_httpstatus = u_httpstatus;
}
public String getU_error_message() {
return u_error_message;
}
public void setU_error_message(String u_error_message) {
this.u_error_message = u_error_message;
}
public String getU_queryparam() {
return u_queryparam;
}
public void setU_queryparam(String u_queryparam) {
this.u_queryparam = u_queryparam;
}
}
投影为:
public interface UserProjection { String getU_httpstatus();
String getU_queryparam();
}
我对如何添加查询(诸如此类)感到困惑:
select u_type,count(u_type) from u_user_click_data group by u_type
我如何更改投影,还有哪些其他必要的更改?
回答:
您可以将DAO更改为下面,这应该可以工作。
public interface UserRequestResponseRepository extends CrudRepository<UserRequestResponse, Integer> {public static final String FIND_QUERY =
"select new com.abc.datacollection.entity.UserRequestResponse(user.u_httpstatus ,user.u_queryparam, COUNT(user.u_type)) from UserRequestResponse user GROUP BY user.u_type";
@Query(value = FIND_QUERY)
//public List<UserProjection> getAllRequestResponseRecords();
List<UserProjection> findAllProjectedBy();
}
确保Bean类构造函数应具有传递的参数。
验证查询是否为有效的JPA查询(此处)。
以上是 CrudRepository中的自定义SQL查询 的全部内容, 来源链接: utcz.com/qa/435339.html