Springboot API returning null value? How can I fix it? - spring-boot

Question

Postman not showing any results
Git hub link - https://github.com/Parthhsheth/Search
The code runs perfect on my system but it is not giving any output.
Simplying returning [{}] when I try to use the search function.
Controller:
package cpp.search.controller;
import java.util.List;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import cpp.search.entity.Employee;
import cpp.search.service.EmployeeService;
#RestController
#RequestMapping("/Employees")
public class EmployeeController {
private EmployeeService employeeService;
public EmployeeController(EmployeeService employeeService) {
super();
this.employeeService = employeeService;
}
#GetMapping("/search")
public ResponseEntity<List<Employee>> searchEmployee(#RequestParam("query") String query){
return ResponseEntity.ok(employeeService.searchEmployee(query));
}
#PostMapping
public Employee createEmployee(#RequestBody Employee employee) {
return employeeService.createEmployee(employee);
}
}
Service:
package cpp.search.service;
import cpp.search.entity.Employee;
import java.util.List;
public interface EmployeeService {
List<Employee> searchEmployee(String query);
Employee createEmployee(Employee employee);
}
Service.Impl:
package cpp.search.service.impl;
import java.util.List;
import org.springframework.stereotype.Service;
import cpp.search.entity.Employee;
import cpp.search.repository.EmployeeRepository;
import cpp.search.service.EmployeeService;
#Service
public class EmployeeServiceImpl implements EmployeeService {
private EmployeeRepository employeeRepository;
public EmployeeServiceImpl(EmployeeRepository employeeRepository) {
super();
this.employeeRepository = employeeRepository;
}
#Override
public List<Employee> searchEmployee(String query) {
List<Employee> employees =
employeeRepository.searchEmployee(query);
return employees;
}
#Override
public Employee createEmployee(Employee employee) {
return employeeRepository.save(employee);
}
}
Repository
package cpp.search.repository;
import java.util.List;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import cpp.search.entity.Employee;
public interface EmployeeRepository extends JpaRepository<Employee, Long> {
#Query("SELECT e FROM Employee e WHERE " +
"e.firstName LIKE CONCAT('%', :query, '%')" +
"Or e.lastName LIKE CONCAT('%', :query, '%')" +
"Or e.id LIKE CONCAT('%', :query, '%')")
List<Employee> searchEmployee(String query);
}
Employee.java
package cpp.search.entity;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import javax.persistence.*;
#Getter
#Setter
#NoArgsConstructor
#AllArgsConstructor
#Entity
#Table(name = "employee")
public class Employee {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String firstName;
private String middleName;
private String lastName;
private boolean covid_result;
}
These are all the files.
It got linked with MySQL, since it created 'employee' table in the database.
But when I'm giving JSON data in Postman it is not working and no new rows are created in MySQL.
Also the search function is not working.
I inserted an entry manually in database and tried to search it via Postman(you can see in the picture). But it is not working.
Edit
Screenshots after using h2
Adding employee
MySQL after adding employee
Manually adding a query
Searching it using API

Answer 1

The data you want to save probably does not get saved because you never flush the changes.
Just use employeeRepository.saveAndFlush(employee); instead of employeeRepository.save(employee); and your data should get saved.
But I have no idea why the GET isn't working since you don't get an error and everything looks fine. I recommend you test the query in a console to make sure it's working fine.

Answer 2

There is no issue with your code. It works perfectly fine with h2. You can find working code with in-memory database here. So can you make sure there is data in your database with firstName or lastName as "Parthh"? If yes, can you share screenshot of your query with data?
Add employee request:
Get employee request and response: