AthleteRepository.java

package com.aggrid.crudapp.repositories;

import com.aggrid.crudapp.model.Athlete;
import org.springframework.data.repository.CrudRepository;

public interface AthleteRepository extends CrudRepository<Athlete, Long> {
    Athlete findByName(String name);
}

CountryRepository.java

package com.aggrid.crudapp.repositories;

import com.aggrid.crudapp.model.Country;
import org.springframework.data.repository.CrudRepository;

public interface CountryRepository extends CrudRepository<Country, Long> {
    Country findByName(String name);
}

ResultRepository.java

package com.aggrid.crudapp.repositories;

import com.aggrid.crudapp.model.Result;
import org.springframework.data.repository.CrudRepository;

public interface ResultRepository extends CrudRepository<Result, Long> {
}

SportRepository.java

package com.aggrid.crudapp.repositories;

import com.aggrid.crudapp.model.Sport;
import org.springframework.data.repository.CrudRepository;

public interface SportRepository extends CrudRepository<Sport, Long> {
    Sport findByName(String name);
}