Question

我正在尝试为从抽象类派生的实体实现Jpa存储库。

基础抽象类：

@MappedSuperclass
public abstract class BaseProduct {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String name;
    private String brand;
    private int price;
    private int availability;
    private String description;
    //constructors getters and setters omitted
}

派生类：

@Entity
public class Product extends BaseProduct {
//constructors omitted
}

JpaRepository扩展名：

@Repository
public interface ProductRepository extends JpaRepository<Product, Long > {
}

它在哪里破裂：

@Bean
    public CommandLineRunner commandLineRunner(ProductRepository productRepository) {
        Log log = LogFactory.getLog(this.getClass());

        return (args) -> {

            ProductInfo p1 = new ProductInfo("Hook1", "lorem", 2, 50, "desc");

            ProductInfo p2 = new ProductInfo("Hook2", "lorem", 2, 50, "desc");

            Product b1 = new Product(p1);
            productRepository.save(b1);

            productRepository.save(new Product(p2));


            productRepository.findAll().forEach(product -> log.info(product.getName()));
        };

这是结果：

Hibernate: select next_val as id_val from hibernate_sequence for update
Hibernate: update hibernate_sequence set next_val= ? where next_val=?
Hibernate: insert into product (availability, brand, description, name, price, id) values (?, ?, ?, ?, ?, ?)
Hibernate: select next_val as id_val from hibernate_sequence for update
Hibernate: update hibernate_sequence set next_val= ? where next_val=?
Hibernate: insert into product (availability, brand, description, name, price, id) values (?, ?, ?, ?, ?, ?)
Hibernate: select product0_.id as id1_0_, product0_.availability as availabi2_0_, product0_.brand as brand3_0_, product0_.description as descript4_0_, product0_.name as name5_0_, product0_.price as price6_0_ from product product0_

Process finished with exit code 1

保存工作正常。对象已正确保存在mysql数据库中

以下是mariadb一般日志的最后几行：

           86 Query insert into product (availability, brand, description, name, price, id) values (50, 'lorem', 'desc', 'Hook2', 2, 2)
           86 Query commit
           86 Query SET autocommit=1
           86 Query SET autocommit=0
           86 Query select product0_.id as id1_0_, product0_.availability as availabi2_0_, product0_.brand as brand3_0_, product0_.description as descript4_0_, product0_.name as name5_0_, product0_.price as price6_0_ from product product0_
           86 Query rollback
           86 Query SET autocommit=1
           86 Quit  
           87 Quit  
           88 Quit  
           89 Quit  
           90 Quit  
           91 Quit  
           92 Quit  
           93 Quit  
           94 Quit  
           95 Quit

.count工作正常，但是，我无法从数据库中读取任何数据。我尝试在没有Entity抽象的情况下进行此操作，并且效果很好。

在抽象类上进行Hibernate查询后，进程以退出代码1完成

0 个答案: