Update or SaveorUpdate in CRUDRespository, Is there any options available

Question

I am trying to do CRUD operations with My Entity bean. CRUDRepository provide standard methods to find, delete and save b

Answer 1

The issue is "i am using thymeleaf UI template and The Bean that i am trying to persist that is Form bean not Entity bean and that's why Spring boot is not saving it. Now i have to convert the entire Form bean into Entity bean with changed values and try to persist it." I got the solution for the specific problem i faced in my project, The solution is use @ModelAttribute to convert the form bean to entity.

@ModelAttribute("spaceSummary")
public SpaceSummary getSpaceSummary(int id){
    return this.spaceSummaryService.getSpaceSummary(id);
}

and

@RequestMapping(value="/mgr/editSpace", method = RequestMethod.POST)
public ModelAndView editSpace(@ModelAttribute("spaceSummary") SpaceSummary                
spaceSummary, BindingResult result, RedirectAttributes redirect, ModelAndView model) {

}

Answer 2

The implementation of the method

<S extends T> S save(S entity)

from interface

CrudRepository<T, ID extends Serializable> extends Repository<T, ID>

automatically does what you want. If the entity is new it will call persist on the entity manager, otherwise it will call merge

The code looks like this:

public <S extends T> S save(S entity) {

    if (entityInformation.isNew(entity)) {
        em.persist(entity);
        return entity;
    } else {
        return em.merge(entity);
    }
}

and can be found here. Note that SimpleJpaRepository is the class that automatically implements CrudRepository in Spring Data JPA.

Therefore, there is no need to supply a custom saveOrUpdate() method. Spring Data JPA has you covered.