spring - Spring存储库级联

Question

我正在使用 Spring Data 存储库来保存我的实体，但由于某种原因，级联不适用于测试 saveCountryAndNewCity() ：城市没有得到保存，但它适用于类似的 saveCityAndNewCountry()。有人可以帮我弄清楚为什么吗？谢谢。

public class City {
@Cascade(CascadeType.ALL)
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "countryid", nullable = false, insertable = true, updatable = true)
private Country country;

public void setCountry(Country country) {
    this.country = country;
    country.getCities().add(this);
}

}


public class Country {
@Cascade(CascadeType.ALL)
@OneToMany(fetch = FetchType.EAGER, mappedBy = "country")
private Set<City> cities = new HashSet<City>(0);

public void addCity(City city){
    this.cities.add(city);
    city.setCountry(this);
}
}


@Test 
@Transactional
public void saveCountryAndCity() throws Exception {
    Country country = countryRepository.findOneByName("Canada");
    City newCity = new City();
    newCity.setName("Quebec");
    country.addCity(newCity);

    countryRepository.save(country);

}

@Test 
public void saveCityAndNewCountry() throws Exception {
    City city = cityRepository.findOneByName("London");

    Country country = new Country();
    country.setName("myCountry");
    city.setCountry(country);

    cityRepository.save(city);
}

Answer 1

Your method that doesn't "work" is marked as @Transactional. By default, Spring will rollback any transactional behavior at the end of the test method. The method that you say it "works" is not transactional and Spring testing framework doesn't know it needs to roll it back.

So, from unit tests perspective what you are doing in there with methods that are not @Transactional is wrong. You would want to just test the behavior and then bring back the database to the state it was before the test so that the same database (in the same state) can be used for other tests without being polluted with testing data from other tests.

So, if you want your other method to insert data, remove the @Transactional annotation. But, as I said, this isn't quite how tests should be done.