How to get the result from select query using Spring boot - mysql

Question

I have a native query in Spring-boot from which I want to get result using rest call, but I'm doing something wrong which is not giving me result. Please see my code below
When I call the repository from controller, it is giving me result, but when I try to call through service implementation, it is throwing me error.
Mysql result for select query I used:
mysql> select * from cricket_match;
[{ "id": 1,
"unique_id": 0,
"date": "2019-09-29T00:00:00.000Z",
"match_started": "Yes",
"team2": "St Lucia Zouks",
"team1": "Barbados Tridents"
},
{
"id": 2,
"date": "2019-08-08",
"team1": "India",
"unique_id": 12345,
"team2": "Australia",
"match_started": "No"
}]
mysql> SELECT unique_id, date, CASE WHEN match_started = 1 THEN 'Yes' ELSE 'No' END match_started, team1, team2, count(unique_id) AS weight FROM cricket_match GROUP BY unique_id, date, match_started, team1, team2 ORDER BY COUNT(unique_id)DESC;
[ {"unique_id": 0,
"date": "2019-09-29T00:00:00.000Z",
"match_started": "Yes",
"team2": "St Lucia Zouks",
"weight": 1,
"team1": "Barbados Tridents"
},
{
"date": "2019-08-08",
"weight": 1,
"team1": "India",
"unique_id": 12345,
"team2": "Australia",
"match_started": "No"
}]
MatchCount.java
package com.stackroute.matchrecommendationservice.domain;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name = "match_recomendation")
public class MatchCount {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Column(name = "unique_id")
private int unique_id;
#Column(name = "team1")
private String teamOne;
#Column(name = "team2")
private String teamTwo;
#Column(name = "date")
private String matchDate;
#Column(name = "match_started", columnDefinition = "TINYINT(1)")
private boolean matchStarted;
#Column(name = "user_id")
private String userId;
}
MatchCountRepository.java
import com.stackroute.matchrecommendationservice.domain.MatchCount;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
import java.util.List;
import java.util.Map;
#RepositoryRestResource
public interface MatchCountRepository extends JpaRepository<MatchCount, Integer> {
List<MatchCount> findByUserId(String userId);
#Query(value = "SELECT unique_id, date, CASE WHEN match_started = 1 THEN 'Yes' ELSE 'No' END match_started, team1, team2, count(unique_id) AS weight FROM cricket_match GROUP BY unique_id, date, match_started, team1, team2 ORDER BY COUNT(unique_id)DESC", nativeQuery = true)
public List<Map<String,Object>> findRecommendations();
#Query(value = "SELECT unique_id, date, CASE WHEN match_started = 1 THEN 'Yes' ELSE 'No' END match_started, team1, team2, count(unique_id) AS weight FROM cricket_match GROUP BY unique_id, date, match_started, team1, team2 ORDER BY COUNT(unique_id)DESC", nativeQuery = true)
public List<MatchCount> findByRecommendations();
}
MatchRecommendationService.java
package com.stackroute.matchrecommendationservice.service;
import com.stackroute.matchrecommendationservice.domain.MatchCount;
import com.stackroute.matchrecommendationservice.exception.MatchAlreadyExistsException;
import com.stackroute.matchrecommendationservice.exception.MatchNotFoundException;
import java.util.List;
public interface MatchRecommendationService {
List<MatchCount> findByRecommendationServiceCall();
}
MatchRecommendationImpl.java
package com.stackroute.matchrecommendationservice.service;
import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.stackroute.matchrecommendationservice.domain.MatchCount;
import com.stackroute.matchrecommendationservice.exception.MatchAlreadyExistsException;
import com.stackroute.matchrecommendationservice.exception.MatchNotFoundException;
import com.stackroute.matchrecommendationservice.repository.MatchCountRepository;
import com.stackroute.rabbitmq.domain.MatchCountDTO;
#Service
public class MatchRecommendationImpl implements MatchRecommendationService{
private MatchCountRepository matchCountRepository;
#Autowired
public MatchRecommendationImpl(MatchCountRepository matchCountRepository) {
this.matchCountRepository = matchCountRepository;
}
#Override
public List<MatchCount> findByRecommendationServiceCall() {
var ResultMatches = (List<MatchCount>)matchCountRepository.findByRecommendations()
return ResultMatches;
}
}
MatchRecommendationController.java
package com.stackroute.matchrecommendationservice.controller;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.stackroute.matchrecommendationservice.repository.MatchCountRepository;
import com.stackroute.matchrecommendationservice.service.MatchRecommendationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import com.stackroute.matchrecommendationservice.domain.MatchCount;
import com.stackroute.matchrecommendationservice.exception.MatchAlreadyExistsException;
import com.stackroute.matchrecommendationservice.exception.MatchNotFoundException;
import com.stackroute.matchrecommendationservice.service.MatchRecommendationService;
#CrossOrigin
#RestController
#RequestMapping(path = "/api/v1/matchservice")
public class MatchRecommendationController {
private ResponseEntity responseEntity;
private MatchRecommendationService matchRecommendationService;
#Autowired
public MatchRecommendationController(final MatchRecommendationService matchService) {
this.matchRecommendationService = matchRecommendationService;
}
#Autowired
private MatchCountRepository matchCountRepository;
//Getting Result
#GetMapping("/{userId}/matchrecommendations")
public List<Map<String, Object>> getMatchrecommendations(){
return matchCountRepository.findRecommendations().stream().collect(Collectors.toList());
}
//Not Getting
#GetMapping("/matchrecommendationnew")
public String getMyMatchRecommendation(Model model) {
var results = (List<MatchCount>) matchRecommendationService.findByRecommendationsServiceCall();
model.addAttribute("results", results);
return "results";
}
}
From the controller when tested in POSTMAN, for
http://localhost:8080/api/v1/matchservice/matchrecommendations result is as below
[ {"unique_id": 0,
"date": "2019-09-29T00:00:00.000Z",
"match_started": "Yes",
"team2": "St Lucia Zouks",
"weight": 1,
"team1": "Barbados Tridents"
},
{
"date": "2019-08-08",
"weight": 1,
"team1": "India",
"unique_id": 12345,
"team2": "Australia",
"match_started": "No"
}]
For http://localhost:8080/api/v1/matchservice/matchrecommendationnew
I don't result, which should be same as above & below is the error
{
"timestamp": "2019-10-07T10:55:54.855+0000",
"status": 500,
"error": "Internal Server Error",
"message": "could not execute query; SQL [SELECT unique_id, date, CASE WHEN match_started = 1 THEN 'Yes' ELSE 'No' END match_started, team1, team2, count(unique_id) AS weight FROM cricket_match GROUP BY unique_id, date, match_started, team1, team2 ORDER BY COUNT(unique_id)DESC]; nested exception is org.hibernate.exception.SQLGrammarException: could not execute query",
"path": "/api/v1/matchservice/matchrecommendationnew"
}
Error Log:
Hibernate: SELECT unique_id, date, CASE WHEN match_started = 1 THEN 'Yes' ELSE 'No' END match_started, team1, team2, count(unique_id) AS weight FROM cricket_match GROUP BY unique_id, date, match_started, team1, team2 ORDER BY COUNT(unique_id)DESC
2019-10-07 18:03:41.391 WARN 11720 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 0, SQLState: S0022
2019-10-07 18:03:41.395 ERROR 11720 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.SqlExceptionHelper : Column 'id' not found.
2019-10-07 18:03:41.516 ERROR 11720 --- [nio-8080-exec-3] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute query; SQL [SELECT unique_id, date, CASE WHEN match_started = 1 THEN 'Yes' ELSE 'No' END match_started, team1, team2, count(unique_id) AS weight FROM cricket_match GROUP BY unique_id, date, match_started, team1, team2 ORDER BY COUNT(unique_id)DESC]; nested exception is org.hibernate.exception.SQLGrammarException: could not execute query] with root cause
java.sql.SQLException: Column 'id' not found.
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129) ~[mysql-connector-java-8.0.17.jar:8.0.17]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.17.jar:8.0.17]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89) ~[mysql-connector-java-8.0.17.jar:8.0.17]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63) ~[mysql-connector-java-8.0.17.jar:8.0.17]
at com.mysql.cj.jdbc.result.ResultSetImpl.findColumn(ResultSetImpl.java:548) ~[mysql-connector-java-8.0.17.jar:8.0.17]
at com.mysql.cj.jdbc.result.ResultSetImpl.getInt(ResultSetImpl.java:807) ~[mysql-connector-java-8.0.17.jar:8.0.17]
at com.zaxxer.hikari.pool.HikariProxyResultSet.getInt(HikariProxyResultSet.java) ~[HikariCP-3.2.0.jar:na] ...
Can you please help me how to write the correct controller mehtod to retrive the data and the Junit test case, for it.***

Answer 1

Thanks All, I was able to get the result when I changed the return type of
findByRecommendationServiceCall() to List<Map<String,Object>> from List<MatchCount>
The resultant changes are as below
MatchCountRepository.java
#Query(value = "SELECT unique_id, date, CASE WHEN match_started = 1 THEN 'Yes' ELSE 'No' END match_started, team1, team2, count(unique_id) AS weight FROM cricket_match GROUP BY unique_id, date, match_started, team1, team2 ORDER BY COUNT(unique_id)DESC", nativeQuery = true)
public List<Map<String,Object>> findByRecommendations();
MatchRecommendationService.java
List<Map<String,Object>> findByRecommendationServiceCall();
MatchRecommendationImpl.java
```
#Override
public List<Map<String,Object>> findByRecommendationServiceCall() {
var ResultMatches = (List<Map<String,Object>>)matchCountRepository.findByRecommendations()
return ResultMatches;
}
```
MatchRecommendationController.java
//Not Getting
#GetMapping("/matchrecommendationnew")
public String getMyMatchRecommendation(Model model) {
var results = (List<Map<String,Object>> matchRecommendationService.findByRecommendationsServiceCall();
model.addAttribute("results", results);
return results;
}