英文:
One @Service for multiple entities in Spring
问题
我有3个相关的实体：`Tag`、`SubcategoryTag`、`CategoryTag`，我想为所有3个实体创建一个共同的`@Service`。
我的Service应该是什么样子的？
public class Tag {
@Id
@GeneratedValue(generator = "optimized-sequence")
@Column(name = "id")
private Long id;
@Column(name = "name", nullable = false, unique = true)
private String name;
@Enumerated(EnumType.STRING)
@Column(name = "tag_type")
private TagType tagType;
@ManyToMany
private Set<QuestionTemplate> questionTemplates;
}
Subcategory和Category继承自Tag
@Entity
@Inheritance(strategy = JOINED)
@Table(name = "T_TAG")
public class SubcategoryTag extends Tag {
@ManyToOne(cascade = CascadeType.ALL, fetch = LAZY)
private CategoryTag parentTag;
}
@Entity
@Inheritance(strategy = JOINED)
@Table(name = "T_TAG")
public class CategoryTag extends Tag {
@OneToMany(orphanRemoval = true)
private Set<SubcategoryTag> subcategoryTagSet;
}
英文:
I have 3 related entities Tag, SubcategoryTag, CategoryTag and I want to create a common @Service for all 3.
How should my Service look?
public class Tag {
@Id
@GeneratedValue(generator = "optimized-sequence")
@Column(name = "id")
private Long id;
@Column(name = "name", nullable = false, unique = true)
private String name;
@Enumerated(EnumType.STRING)
@Column(name = "tag_type")
private TagType tagType;
@ManyToMany
private Set<QuestionTemplate> questionTemplates;
}
Subcategory and Category inherit from Tag
@Entity
@Inheritance(strategy = JOINED)
@Table(name = "T_TAG")
public class SubcategoryTag extends Tag {
@ManyToOne(cascade = CascadeType.ALL, fetch = LAZY)
private CategoryTag parentTag;
}
@Entity
@Inheritance(strategy = JOINED)
@Table(name = "T_TAG")
public class CategoryTag extends Tag {
@OneToMany(orphanRemoval = true)
private Set<SubcategoryTag> subcategoryTagSet;
}
答案1
得分: 0
创建三个实体的存储库
public interface TagRepo extends JpaRepository<Tag, Long>{}
public interface SubcategoryRepo extends JpaRepository<Subcategory, Long>{}
public interface CategoryTagRepo extends JpaRepository<CategoryTag,Long>{}
然后添加服务类并自动装配这三个存储库。
@Service
public class TagService {
@Autowired
TagRepo tagRepo;
@Autowired
SubcategoryRepo subcategoryRepo;
@Autowired
CategoryTagRepo categoryTagRepo;
//添加您的方法
}
英文:
Create repositories for the three entities
public interface TagRepo extends JpaRepository<Tag, Long>{}
public interface SubcategoryRepo extends JpaRepository<Subcategory, Long>{}
public interface CategoryTagRepo extends JpaRepository<CategoryTag,Long>{}
then add the service class and Autowire the three repositories.
@Service
public class TagService {
@Autowired
TagRepo tagRepo;
@Autowired
SubcategoryRepo subcategoryRepo;
@Autowired
CategoryTagRepo categoryTagRepo;
//Add your methods
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论