[英]How can i get an object with checks on nested object in Spring boot?
我無法使用JpaRepository得到我想要的東西。 我將嘗試使用以下代碼解釋我想要的內容:
知識庫
@Repository
public interface CompanyRepository extends JpaRepository<Company, Long> {
Optional<Company> findByIdAndBranches_parent_idIsNull(Long id);
}
服務
@Service
public class BillService {
@Autowired
private CompanyRepository companyRepository;
@Autowired
private BranchRepository branchRepository;
public Company getCompanyById(Long id)
{
Optional<Company> company = companyRepository.findByIdAndBranches_parent_idIsNull(id);
return company.get();
}
公司實體類
public class Company
{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
private String address;
@OneToMany(mappedBy = "company")
private List<Branch> branches;
@OneToMany(mappedBy = "company")
private List<User> users;
}
分支實體類
@Entity
public class Branch
{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
private String address;
@JsonIgnore
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "company_id")
private Company company;
@JsonIgnore
@ManyToOne(cascade = CascadeType.ALL )
@JoinColumn(name = "parent_id")
@NotFound(action = NotFoundAction.IGNORE)
private Branch parent;
@OneToMany(mappedBy = "parent")
@NotFound(action = NotFoundAction.IGNORE)
private List<Branch> subBranches;
@OneToMany(mappedBy = "branch")
private List<User> users;
}
現在我想要得到的是分支機構的父ID為NULL但與父ID無關的所有分支
這就是我想要的結果
{
"id": 1,
"name": "Lakshya",
"address": "Bahadurgarh",
"branches": [
{
"id": 1,
"name": "Lakshya Branch1",
"address": "Bahadurgarh1",
"subBranches": [
{
"id": 3,
"name": "Lakshya Branch1_3",
"address": "Bahadurgarh1_3",
"subBranches": [],
"users": []
}
],
"users": [
{
"id": 3,
"name": "User3_Company1_Branch1",
"address": "Bgz"
}
]
}
],
"users": [
{
"id": 1,
"name": "User_Company1",
"address": "Bgz"
},
{
"id": 2,
"name": "User_Company1_Branch1",
"address": "Bgz"
},
{
"id": 3,
"name": "User3_Company1_Branch1",
"address": "Bgz"
}
]
}
但這就是越來越
{
"id": 1,
"name": "Lakshya",
"address": "Bahadurgarh",
"branches": [
{
"id": 1,
"name": "Lakshya Branch1",
"address": "Bahadurgarh1",
"subBranches": [
{
"id": 3,
"name": "Lakshya Branch1_3",
"address": "Bahadurgarh1_3",
"subBranches": [],
"users": []
}
],
"users": [
{
"id": 3,
"name": "User3_Company1_Branch1",
"address": "Bgz"
}
]
},
{
"id": 3,
"name": "Lakshya Branch1_3",
"address": "Bahadurgarh1_3",
"subBranches": [],
"users": []
}
],
"users": [
{
"id": 1,
"name": "User_Company1",
"address": "Bgz"
},
{
"id": 2,
"name": "User_Company1_Branch1",
"address": "Bgz"
},
{
"id": 3,
"name": "User3_Company1_Branch1",
"address": "Bgz"
}
]
}
如果需要過濾掉關聯的實體,可以使用@Where 。 它不是JPA規范的一部分,但是Hibernate的JPA實現提供了此注釋。 因此,您可以指定任何其他條件:
public class Company
{
...
@OneToMany(mappedBy = "company")
@Where(clause = "parent_id is null")
private List<Branch> branches;
@OneToMany(mappedBy = "company")
private List<User> users;
}
然后,您必須更改存儲庫的方法名稱,因為您不再需要額外的條件:
@Repository
public interface CompanyRepository extends JpaRepository<Company, Long> {
Optional<Company> findById(Long id);
}
使用這種方法,您總會得到只有分支機構且沒有母公司的公司。 如果需要獲取公司的所有分支機構(無論是否具有母公司),都可以為Branch
實體類創建和使用存儲庫。
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