JPA : Update operation without JPA query or entitymanager - jpa

Question

I am learning JPA, I found out that we have some functions which is already present in Jparepository like save,saveAll,find, findAll etc. but there is nothing like update,
I come across one scenario where I need to update the table, if the value is already present otherwise I need to insert the record in table.
I created
#Repository
public interface ProductInfoRepository
extends JpaRepository<ProductInfoTable, String>
{
Optional<ProductInfoTable> findByProductName(String productname);
}
public class ProductServiceImpl
implements ProductService
{
#Autowired
private ProductInfoRepository productRepository;
#Override
public ResponseMessage saveProductDetail(ProductInfo productInfo)
{
Optional<ProductInfoTable> productInfoinTable =
productRepository.findByProductName(productInfo.getProductName());
ProductInfoTable productInfoDetail;
Integer quantity = productInfo.getQuantity();
if (productInfoinTable.isPresent())
{
quantity += productInfoinTable.get().getQuantity();
}
productInfoDetail =
new ProductInfoTable(productInfo.getProductName(), quantity + productInfo.getQuantity(),
productInfo.getImage());
productRepository.save(productInfoDetail);
return new ResponseMessage("product saved successfully");
}
}
as you can see, I can save the record if the record is new, but when I am trying to save the record which is already present in table it is giving me error related to primarykeyviolation which is obvious. I checked somewhat, we can do the update by creating the entitymanager object or jpa query but what if I dont want to use both of them. is there any other way we can do so ?
update I also added the instance of EntityManager and trying to merge the code
#Override
public ResponseMessage saveProductDetail(ProductInfo productInfo)
{
Optional<ProductInfoTable> productInfoinTable =
productRepository.findByProductName(productInfo.getProductName());
ProductInfoTable productInfoDetail;
Integer price = productInfo.getPrice();
if (productInfoinTable.isPresent())
{
price = productInfoinTable.get().getPrice();
}
productInfoDetail =
new ProductInfoTable(productInfo.getProductName(), price, productInfo.getImage());
em.merge(productInfoDetail);
return new ResponseMessage("product saved successfully");
but no error, no execution of update statements in log, any possible reasons for that ?
}

Answer 1

I suspect you need code like this to solve the problem
public ResponseMessage saveProductDetail(ProductInfo productInfo)
{
Optional<ProductInfoTable> productInfoinTable =
productRepository.findByProductName(productInfo.getProductName());
final ProductInfoTable productInfoDetail;
if (productInfoinTable.isPresent()) {
// to edit
productInfoDetail = productInfoinTable.get();
Integer quantity = productInfoDetail.getQuantity() + productInfo.getQuantity();
productInfoDetail.setQuantity(quantity);
} else {
// to create new
productInfoDetail = new ProductInfoTable(productInfo.getProductName(),
productInfo.getQuantity(), productInfo.getImage());
}
productRepository.save(productInfoDetail);
return new ResponseMessage("product saved successfully");
}