I have two entities, each one pointing to one single table in an postgres. The entities belong to an Spring/graddle/JPA/Hibernate web application.
#Entity
#Table(name = "STAFF")
#AttributeOverride(name = "id", column = #Column(name = "ID"))
public class StaffEntity extends AbstractEntity {
#Column(name = "NAME")
private String name;
#Column(name = "SHORT_NAME")
private String shortName;
#ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
#JoinColumn(name = "STAFF_GROUP_ID", referencedColumnName = "ID")
private StaffGroupEntity staffGroup;
/* More attributes, getters and setters */
#Entity
#Table(name = "STAFF_GROUP")
#AttributeOverride(name = "id", column = #Column(name = "ID"))
public class StaffGroupEntity extends AbstractEntity {
#Column(name = "NAME")
private String name;
#ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
#JoinColumn(name = "LEAD_ID", referencedColumnName = "ID")
private StaffEntity lead;
/* More attributes, getters and setters */
When i update with swagger the group with a lead that is already in the group i get a stackOverFlowError
java.lang.StackOverflowError: null
mapping with mapstruct
Related
I have 3 tables as #Entity, and 2 join tables in my spring + hibernate app.
In one of join table i have extra column. I want to take info from this info column when i take info from my main table.
Main table code:
#Entity
#Table(name = "items")
public class Items {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private int id;
#Column(name = "name")
private String name;
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(name = "crafts"
,joinColumns = #JoinColumn(name = "item_id")
,inverseJoinColumns = #JoinColumn(name = "plot_id"))
private Set<Plots> plotInfo = new HashSet<>();
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(name = "item_materials"
,joinColumns = #JoinColumn(name = "item_id")
,inverseJoinColumns = #JoinColumn(name = "material_id"))
private Set<Materials> materialsInfo = new HashSet<>();
Table item_materials have this columns "id, item_id(fkey), material_id(fkey), expense" and one of this which names as "expense" i need to have in my final result.
How can i code my class to have "expense" in my result?
I read about #embeddable but still dont understand how to use in my project.
Don't use a #ManyToMany association. Map the join table as entity and model it similar to this:
#Entity
#Table(name = "items")
public class Items {
#OneToMany(mappedBy = "item")
private Set<Crafts> plotInfo = new HashSet<>();
}
#Entity
#Table(name = "plots")
public class Plots {
#OneToMany(mappedBy = "plot")
private Set<Crafts> items = new HashSet<>();
}
#Entity
#Table(name = "crafts")
public class Crafts {
#EmbeddedId
private CraftsId id;
#ManyToOne
#JoinColumn(name = "item_id", insertable = false, updatable = false)
private Items item;
#ManyToOne
#JoinColumn(name = "plot_id", insertable = false, updatable = false)
private Plots plot;
}
#Embeddable
public class CraftsId {
#Column(name = "item_id")
private Integer itemId;
#Column(name = "plot_id")
private Integer plotId;
// equals + hashCode
}
Currently I have the following 2 entities with a one to many relationship -
#Data
#Entity
#Table(name = "invoice_line")
#IdClass(InvoiceLinePK.class)
public class InvoiceLineEntity {
#Id
#Column(name = "line_id")
private String lineId;
#Id
#Column(name = "client_id")
private Integer clientId;
#Id
#Column(name = "invoice_id")
private String invoiceId;
#Column(name = "item_id")
private String itemId;
#Column(name = "amount")
private BigDecimal amount;
#ManyToOne
private InvoiceEntity invoice;
}
#Entity
#Table(name = "invoice")
#IdClass(InvoicePK.class)
#Data
public class InvoiceEntity {
#Id
#Column(name = "client_id")
private Integer clientId;
#Id
#Column(name = "invoice_id")
private String invoiceId;
#Column(name = "description")
private String description;
#Column(name = "txn_total_amount")
private BigDecimal txnTotalAmount;
#Column(name = "created_time", updatable = false)
#CreationTimestamp
private Date createdTime;
#Column(name = "updated_time")
#UpdateTimestamp
private Date updatedTime;
#OneToMany(fetch = FetchType.EAGER, orphanRemoval = true, mappedBy = "invoice")
private List<InvoiceLineEntity> invoiceLines;
}
In a case wherein let's say, one of my existing invoice has 3 lines and I receive a request that this particular invoice has been updated and it now has only 1 line instead of the previous 3 (so the other 2 have to be deleted), I would like to create a new Invoice object with this 1 InvoiceLineEntity and then do a invoiceRepository.save(invoice)
I am expecting that the other 2 InvoiceLine records would be automatically deleted because the orphanRemoval flag is enabled.
Can someone tell me how I can achieve this relationship by tweaking the entity relationship structure of the above 2 entities?
Your child entity must be the owner of the relationship, so that the orphans are allowed to be deleted
If you change and add mappedBy to that relation
#OneToMany(fetch = FetchType.EAGER, orphanRemoval = true, mappedBy = "bill")
private List<BillLine> billLines;
Then the BillLine must also hold a reference
public class BillLine {
#Id
#Column(name = "line_id")
private String lineId;
#Id
#Column(name = "company_id")
private Integer companyId;
#Id
#Column(name = "bill_id")
private String billId;
#Column(name = "item_id")
private String itemId;
#Column(name = "amount")
private BigDecimal amount;
#ManyToOne
private Bill bill;
}
Now it will remove the orphans
Also since you have multiple #Id on each entity. Do you know that you have to either declare a composite class or an embeddable class? Without one of those the multiple Ids are not valid.
Edit:
1) My bad mappedBy should be placed inside #OneToMany and not #JoinColumn. I have corrected it in my answer
2) Remove #JoinColumn. It is wrong in your configuration. By default #OneToMany inserts a column in the side of the #ManyToOne which holds the references to the primary table. You can override those default configurations and create a separate table for mappings but then you need the #JoinTable and I don't see any reason for that here.
This here
#JoinColumns(value = { #JoinColumn(name = "company_id", referencedColumnName = "company_id"),
#JoinColumn(name = "bill_id", referencedColumnName = "bill_id") })
definitely does not belong on #OneToMany
The following can be applied to #OneToMany but as said before I don't see any reason to do that and complicate a simple mapping which does not require a separate table.
#JoinTable(joinColumns = #JoinColumn(name = "company_id", referencedColumnName = "company_id"),
inverseJoinColumns = #JoinColumn(name = "bill_id", referencedColumnName = "bill_id") )
Check here for more information Jpa primary key
I am facing a hibernate problem in updainting the join table in one to many mapping with hibernate. Below are my two entity class and join table entity class.
ArticleCategoryMap.java
#Entity
#Table(name = "ARTICLECATEGORYMAP")
public class ArticleCategoryMap {
private static final long serialVersionUID = -5653708523600543988L;
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE)
#Column ( name = "id")
Long id;
#ManyToOne(targetEntity = Article.class, fetch = FetchType.EAGER, optional = true, cascade = CascadeType.PERSIST)
#JoinColumn(name = "ARTICLE_ID", nullable = true, insertable = true, updatable = true)
private Article article;
#ManyToOne(targetEntity = Category.class, fetch = FetchType.EAGER, optional = true, cascade = CascadeType.PERSIST)
#JoinColumn(name = "CATEGORY_ID", nullable = true, insertable = true, updatable = true)
private Category category;
//setter and getter
}
Article.java
#Entity
#Table(name = "ARTICLE")
public class Article {
private long id;
private String title;
private String description;
private String keywords;
private String content;
#Id
#GeneratedValue
#Column(name = "ARTICLE_ID")
public long getId() {
return id;
}
//setter and getter
}
Category.java
#Entity
#Table(name = "CATEGORY")
public class Category {
private long id;
private String name;
#OneToMany(cascade = CascadeType.ALL, fetch=FetchType.EAGER)
#JoinTable(
name = "ARTICLECATEGORYMAP",
joinColumns = #JoinColumn(name = "CATEGORY_ID"),
inverseJoinColumns = #JoinColumn(name = "ARTICLE_ID")
)
#CollectionId(
columns = #Column(name="id"),
type=#Type(type="long"),
generator = "sequence"
)
private Collection<Article> articles;
#Id
#GeneratedValue
#Column(name = "CATEGORY_ID")
public long getId() {
return id;
}
#OneToMany(cascade = CascadeType.ALL, fetch=FetchType.EAGER)
#JoinTable(
name = "ARTICLECATEGORYMAP",
joinColumns = #JoinColumn(name = "CATEGORY_ID"),
inverseJoinColumns = #JoinColumn(name = "ARTICLE_ID")
)
#CollectionId(
columns = #Column(name="id"),
type=#Type(type="long"),
generator = "sequence"
)
// setter an getter
}
Now suppose first time I have 2 elements in article table which is mapping to one entry of the category table. so the join table will look something like
Now due to some reason, I want to update the entry where the article entry will map to a new category ID. So the final DB should look like
So My problem Is how can I update this join table.
If you want one to many relationship (1 category have many articles and 1 article to 1 category) you dont need a join table.
The entity classes should look like that:
Category Entity:
Contains a Set of articles:
#Entity
#Table(name = "CATEGORY")
public class Category {
private long id;
private String name;
#OneToMany(mappedBy="category")
private Set<Article> articles;
......
}
Article Entity:
#Entity
#Table(name = "ARTICLE")
public class Article {
#ManyToOne
#JoinColumn(name="id", nullable=false)
private Category category;
private long id;
private String title;
private String description;
private String keywords;
private String content;
.......
}
For more details take a look at hibernate-one-to-many. Hope this helps.
Also move annotation from methods to fields. This:
private long id;
#Id
#GeneratedValue
#Column(name = "CATEGORY_ID")
public long getId() {
return id;
}
Should be:
#Id
#GeneratedValue
#Column(name = "CATEGORY_ID")
private long id;
public long getId() {
return id;
}
Many to many relationship:
At your database you have 3 tables:
CATEGORY
ARTICLE
ARTICLECATEGORYMAP (join table)
For many to many relationship entities would be:
Category Entity:
#Entity
#Table(name = "CATEGORY")
public class Category {
#Id
#GeneratedValue
#Column(name = "CATEGORY_ID")
private long id;
private String name;
#ManyToMany(cascade = { CascadeType.ALL })
#JoinTable(
name = "ARTICLECATEGORYMAP",
joinColumns = { #JoinColumn(name = "CATEGORY_ID") },
inverseJoinColumns = { #JoinColumn(name = "ARTICLE_ID") }
)
Set<Article > articles = new HashSet<>();
.....
}
Article Entity:
#Entity
#Table(name = "ARTICLE")
public class Article {
#Id
#GeneratedValue
#Column(name = "ARTICLE_ID")
private long id;
private String title;
private String description;
private String keywords;
private String content;
#ManyToMany(mappedBy = "articles")
private Set<Category> categories = new HashSet<>();
.......
}
For more info take a look at many-to-many ralationship
I have many to many relationship between Person and Address tables.
Person:
#Entity
#Table(name = "PERSON_MTM", schema = "Examples")
public class Person
{
#Id
#Column(name = "PERSON_ID")
private String personId;
#Column(name = "PERSON_NAME")
private String personName;
#ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
#JoinTable(name = "PERSON_ADDRESS", schema = "KunderaExamples",joinColumns = { #JoinColumn(name = "PERSON_ID") }, inverseJoinColumns = { #JoinColumn(name = "ADDRESS_ID") })
private Set<AddressMTM> addresses;
//setters and getters
}
Address:
#Entity
#Table(name = "ADDRESS_MTM", schema = "Examples")
public class Address
{
#Id
#Column(name = "ADDRESS_ID")
private String addressId;
#Column(name = "STREET")
private String street;
// setters and getters
}
I have a joinTable named PERSON_ADDRESS.
Can I add non-Id fields to join-table?
Are there any JPA constraints in it?
Note: My question is not in terms of Hibernate. I am asking on
behalf of JPA 2.1
You can use multiple JoinColumms, e.g. including PERSON_NAME (if this makes sense for your logic)
#ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
#JoinTable(
name = "PERSON_ADDRESS",
schema = "KunderaExamples",
joinColumns = {
#JoinColumn(name="PERSON_NAME"),
#JoinColumn(name = "PERSON_ID") },
inverseJoinColumns = {
#JoinColumn(name = "ADDRESS_ID") })
private Set<AddressMTM> addresses;
I use hibernate and spring-data. There are two tables with many-to-many relationship.
#Entity
#Table(name = "FirstEntity")
public class FirstEntity {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "first_entity_id")
private Long id;
#Column(name = "first_entiry_name")
private String name;
/* getters and setters are below*/
}
#Entity
#Table(name = "SecondEntity")
public class SecondEntity {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "second_entity_id")
private Long id;
#Column(name = "second_entiry_name")
private String name;
#Column(name = "second_entiry_desc")
private String description;
/* getters and setters are below*/
}
And entity for cross-reference table.
#Entity
#Table(name = "FirstSecondEntity")
public class FirstSecondEntity {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "first_second_entity_id")
private Long id;
#Column(name = "first_entity_id")
private Long firstEntityId;
#Column(name = "second_entity_id")
private Long secondEntityId;
/* getters and setters are below*/
}
I need SELECT like this
SELECT FirstEntity.name, SecondEntity.name, SecondEntity.description FROM SecondEntity INNER JOIN FirstSecondEntity ON SecondEntity.id = FirstSecondEntity.secondEntityId INNER JOIN User ON FirstEntity.id = FirstSecondEntity.firstEntityId
i.e. I need all records from cross-reference table where instead of ids there is actual info from entities.
Inserting this query into #Query annotation in my CrudRepository-extended class doesn't work because of
ERROR [main][org.hibernate.hql.internal.ast.ErrorCounter] Path expected for join!
So I need your help.
Your join table is all screwed up. In this case, you actually don't even need the join table as a hibernate mapping:
In Second Entity add the following list:
#ManyToMany(fetch = FetchType.LAZY)
#JoinTable(name = "FirstSecondEntity",
joinColumns = {
#JoinColumn(name = "first_entity_id",
nullable = false,
updatable = false) },
inverseJoinColumns = {
#JoinColumn(name = "second_entity_id",
nullable = false,
updatable = false) },
)
private List<FirstEntity> firstEntities;
In FirstEntity add the following list:
#ManyToMany(fetch = FetchType.LAZY,
mappedBy = "firstEntities")
private List<SecondEntity> secondEntities;