I have an ClientUser entity with #OneToMany field customField:
#Entity
#Data
public class ClientUser {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE)
private long id;
#OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
#JoinTable(
name = "client_user_custom_field",
joinColumns = #JoinColumn(name = "user_id", referencedColumnName = "id"),
inverseJoinColumns = #JoinColumn(name = "field_id", referencedColumnName = "id"))
private Collection<ClientFieldValue> customFields;
}
And a ClientFieldValue entity:
#Entity
#Data
public class ClientFieldValue {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE)
private long id;
private String value;
}
How can I create ClientFieldValue's for all existing ClientUser?
I know that I can do smth like:
final Iterable<ClientUser> clientUsers = userRepository.findAll();
clientUsers.forEach(clientUser ->
clientUser.setCustomFields(Collections.singleton(new ClientFieldValue())));
userRepository.saveAll(clientUsers);
But I don't want to query all and save them after set.
Is there another way to do this?
Related
I have two Entities in my Spring-Boot mongoDb Application:
Course.java
#Entity
#Table(name = "students")
public class Course {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
Long id;
String title;
#Enumerated(EnumType.STRING)
OptionCourse optionCourse;
private double fee;
#ManyToMany(fetch = FetchType.LAZY,
cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
},
mappedBy = "courses")
private Set<Student> student = new HashSet<>();
}
and
Student.java
Entity
#Table(name = "students")
public class Student {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
Long id;
int age;
String department;
#ManyToMany(fetch = FetchType.LAZY,
cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
})
#JoinTable(name = "student_courses",
joinColumns = { #JoinColumn(name = "student_id") },
inverseJoinColumns = { #JoinColumn(name = "course_id") })
private Set<Course> courses = new HashSet<>();
}
for my mongoDb database:
I want to realise a Many-to-Many-Relationship between both Entities. Every courses should be able to assign multiple student.
How can i replace my annotations (#Entity, #Table,#Id, #Enumerated(EnumType.STRING) and #ManyToMany(fetch = FetchType.LAZY,...)) in my entities. I use spring-boot-starter-data-mongodb in my maven dependencies
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (ravermeister.artist_recordlabel, CONSTRAINT FK_9dgdyft45droyopxsqijwb1dx FOREIGN KEY (artist_id) REFERENCES artist (id))
Artist class
#Entity
#Repository
#Data
#NoArgsConstructor(force = true)
public class Artist {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#Column(name = "artist_firstname")
private String artist_firstname;
#Column(name = "artist_secondname")
private String artist_secondname;
#Column(name = "artist_nickname")
private String artist_nickname;
#ManyToMany (fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.MERGE})
#JoinTable(name = "artist_recordlabel", joinColumns = #JoinColumn(name = "artist_id"),
inverseJoinColumns = #JoinColumn(name = "label_id"))
private Set<RecordLabel> recordLabels;
#ManyToMany (fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.MERGE})
#JoinTable (name = "artist_musicrelease", joinColumns = #JoinColumn (name = "artist_id"),
inverseJoinColumns = #JoinColumn (name = "musicrelease_id"))
private Set <MusicRelease> musicReleaseSet;
and RecordLabel class
#Entity
#Repository
#Data
#NoArgsConstructor(force = true)
public class RecordLabel {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#Column(name = "label_name")
private String label_name;
#Column(name = "label_country")
private String label_country;
#ManyToMany(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.MERGE})
#JoinTable(name = "artist_recordlabel", joinColumns = #JoinColumn(name = "label_id"),
inverseJoinColumns = #JoinColumn(name = "artist_id"))
private Set<Artist> artistsList;
Please follow this guide for a many-to-many relation
http://www.baeldung.com/hibernate-many-to-many
I think this error means that you are trying to insert/update into RecordLabel table a artist_id value that does not exist in Artist table.
How select records without parent with Hibernate using Criteria API?
Here is my Java code for select with parents
getSessionFactory().getCurrentSession().createCriteria(Category.class).add(
Restrictions.eq("parent", new Category(parentId))).list();
Category Java code
#Entity
#Table(name = "CATEGORY")
public class Category implements NamedModel{
#Id
#Column(name = "CATEGORY_ID")
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#OneToOne(cascade = CascadeType.REMOVE, fetch = FetchType.LAZY)
#JoinTable(name = "CATEGORY_RELATIONS",
joinColumns = {
#JoinColumn(name = "CATEGORY_RELATIONS_CATEGORY_ID", referencedColumnName = "CATEGORY_ID")},
inverseJoinColumns = {
#JoinColumn(name = "CATEGORY_RELATIONS_PARENT_ID", referencedColumnName = "CATEGORY_ID")})
private Category parent;
#OneToMany(cascade = CascadeType.REMOVE, fetch = FetchType.EAGER, mappedBy = "parent")
private List<Category> children;//...
}
CategoryRelations Java code
#Entity
#Table(name = "CATEGORY_RELATIONS")
#IdClass(CategoryRelations.CategoryRelationsPrimaryKey.class)
public class CategoryRelations implements Serializable {
#Id
#Column(name = "CATEGORY_RELATIONS_CATEGORY_ID")
private long categoryId;
#Id
#Column(name = "CATEGORY_RELATIONS_PARENT_ID")
private long parentId;
#Entity
#IdClass(CategoryRelationsPrimaryKey.class)
public static class CategoryRelationsPrimaryKey implements Serializable {
private long categoryId;
private long parentId;
}
}
You can use Restriction#isNull(propertyName) function for your requirements.
Restrictions.isNull("parent")
I'm trying to create a join table with #JoinTable from 3 different entities. Below is the code sample I'm using. While creating join table I'm getting below error. Please help to resolve.
There are 3 entities in my design. Credential, Category and Tenant.
Now I'm trying to make a join table that will contain the pk of these 3 tables using #ManyToMany annotation between them. Below is the relationship which I'm trying to make.
#Entity
#Table(name = "CREDENTIALS")
public class CredentialsEntity {
/** The credential id. */
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "ID")
private int credentialId;
#ManyToMany(cascade={CascadeType.PERSIST, CascadeType.MERGE})
#JoinTable(name = "CATEGORY_HAS_CREDENTIALS",
joinColumns = {
#JoinColumn(table="CATEGORY", name = "CATEGORY_ID", referencedColumnName = "ID"),
#JoinColumn(table ="TENANT", name = "TENANT_ID", referencedColumnName = "ID")},
inverseJoinColumns = #JoinColumn(table="CREDENTIALS", name = "CREDENTIAL_ID", referencedColumnName = "ID"))
private List<TenantEntity> tenantEntities;
}
==========================
#Entity
#Table(name = "TENANT")
public class TenantEntity {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "ID")
private int tenantId;
#ManyToMany(mappedBy = "tenantEntities", cascade = CascadeType.ALL)
private List<CredentialsEntity> credentialsEntities;
}
==========================
#Entity
#Table(name = "CATEGORY")
public class NodeCategory {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "ID")
private int categoryId;
#ManyToMany(cascade = CascadeType.ALL)
private List<CredentialsEntity> credentialsEntities;
}
Caused by:
org.hibernate.AnnotationException: Cannot find the expected secondary
table: no TENANT available for
com.aricent.aricloud.entity.CredentialsEntity at
org.hibernate.cfg.Ejb3Column.getJoin(Ejb3Column.java:363) at
org.hibernate.cfg.Ejb3Column.getTable(Ejb3Column.java:342) at
org.hibernate.cfg.Ejb3Column.checkPropertyConsistency(Ejb3Column.java:584)
at
org.hibernate.cfg.annotations.CollectionBinder.buildCollectionKey(CollectionBinder.java:1018)
at
org.hibernate.cfg.annotations.CollectionBinder.bindCollectionSecondPass(CollectionBinder.java:1336)
EDIT
I'm able to do the jointable like below, as mentioned in link
is this correct approach or I'm doing something wrong?
#ManyToMany(cascade={CascadeType.ALL})
#JoinTable(name = "CATEGORY_HAS_CREDENTIALS",
joinColumns = {
#JoinColumn(name = "CREDENTIAL_ID", referencedColumnName = "ID")},
inverseJoinColumns = #JoinColumn(table = "CATEGORY", name = "CATEGORY_ID", referencedColumnName = "ID"))
#MapKeyJoinColumn(name = "TENANT_ID", referencedColumnName ="ID")
#ElementCollection
private Map<TenantEntity, NodeCategory> tenantCategoryMap = new HashMap<TenantEntity, NodeCategory>();
Is it possible to expose a manytomany relationship that uses a join entity (that contains extra data columns), below is my entities;
I'm trying to get 'purchases' to show in REST, I've put in 'products' as an example of a working REST mapping;
#Entity
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, targetEntity = Purchase.class, orphanRemoval = true)
#JoinColumn(name = "user_id", updatable = false)
private List<Purchase> purchases = new ArrayList<>();
#ManyToMany
#JoinColumn(name = "user_id", updatable = false)
private List<Product> products = new ArrayList<>();
}
#Entity
public class Product {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
}
#Entity
public class Purchase implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
#ManyToOne
#JoinColumn(name = "user_id", referencedColumnName = "id")
private User user;
#ManyToOne(targetEntity = Prodect.class)
#JoinColumn(name = "product_id", referencedColumnName = "id")
private Product product;
#Column(name = "purchase_date")
private Date purchaseDate;
}
So if i send the REST call;
[GET http://localhost:8080/webapp/users/1]
It returns links for [http://localhost:8080/webapp/users/1/products] but not for [http://localhost:8080/webapp/users/1/purchases]
worked out what the issue was; I need to create a JpaRepository for the Purchase entity. Soon as I added that, the REST links for purchases are available.