在 spring-data-jpa 中创建自定义查询的正确方法是什么

Question

I am facing an issue where when I run my spring boot application with my custom query method, I am getting an exception.

My repository class is below

public interface ProductRepository extends Repository<Product,Integer> {

@Query(name = "SELECT p.rate FROM Product p WHERE p.id=:id")
public Optional<String> findRateById(@Param("id") int id);

@Modifying
@Query(name = "UPDATE Product p set p.productName=:productName WHERE p.id=:id")
public int updateProductNameById(@Param("id") int id,@Param("productName") String 
productName);

}

And the exception that I'm getting

Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract int com.spring.data.jpa.repository.ProductRepository.updateProductNameById(int,java.lang.String)! No property updateProductNameById found for type Product!

Answer 1

The name property within the @Query annotation determines the use of a NamedQuery. If you want to use Named Query than you should use the @NamedQuery annotation in your entity.

@Entity
@Table
@NamedQuery(name="updateProduct", query="UPDATE PRODUCT ....")
public class Product 

You can read more about it here JPA

If you don't want to use namedquery than, just remove the name property inside the @Query annotation.