I am reading currently the documentation of Hibernate regarding the entity associations and I come accross a little difficulty to figure out some things. It has to do in essence with the difference...

I want to delete the parent row if the associated rows in child tables have been removed. class Child(Base): __tablename__ = "children" id = Column(Integer, primary_key=True) parent_i...

I have two entity classes Country and Language having bi-directional one to many relationship. Below are the entity classes: @Entity @Table(name = "COUNTRY") public class Country { @Id @Genera...

I use Spring Data JPA and MySQL. I have one to many relation between Event and Category. Obviously: one Event can have only one Category one Category can be assigned many Events. The problem appe...

I have two entities Dept and Emp (real case changed and minimized). There is 1:n association between them, i.e. properties Dept.empList and Emp.dept exist with respective annotations. I want to get...

Ok so this is probably a trivial question but I'm having trouble visualizing and understanding the differences and when to use each. I'm also a little unclear as to how concepts like uni-directiona...

One of the requirements in an application I am building is for a form input that takes in a varying number of items for a single field. For instance, the sports that I play are ('Soccer','Tennis','...

I'm using Spring Data JPA with Spring boot version 1.3.6.RELEASE with in-memory database. I'm wondering how to paginate the child entities from a parent entity. Setting fetch to LAZY is not a solu...

In the example section of the @OneToMany JPA annotation reference: Example 1-59 @OneToMany - Customer Class With Generics @Entity public class Customer implements Serializable { ... @OneToMany(...

I'm using Spring Boot,REST and JPA to build my application. In app, there are 2 entities with one to many relationship. Entity 1 : @Entity @Table( name = "report") @JsonIgnoreProperties(ignoreUnk...

In the class Parent there is a list List. When the parent is saved the children which have been added or changed shall be save / updated by hibernate. I've found many explanations on this, however...

I want to persist parent entity with 20 child entities, my code is below Parent Class @OneToMany(mappedBy = "parentId") private Collection<Child> childCollection; Child Class @JoinCol...

I am coding up a dictionary using Django. I want a word to have multiple definitions, if necessary. This would be a one-to-many relationship, but Django does not seem to have a OneToManyField. Thi...

I started using Room database and went through several docs to create room entities. These are my relations. A Chat Channel can have Many Conversations. So this goes as one-to-many relationship. H...

I'm using Hibernate with annotations (in spring), and I have an object which has an ordered, many-to-one relationship which a child object which has a composite primary key, one component of which ...

I have a problem with generating multiple one-to-many relationship for a model using factories in Laravel. The factories seem to only be generating one ClubFixture per Club, when they should be gen...

I've created a 'document' entity: e.g. @Entity() export class Document { @PrimaryGeneratedColumn() id: number; @Column() name: string; @Column() path: string; ... } Multiple document...

I have a struct definition in GO like this package models //StoryStatus indicates the current state of the story type StoryStatus string const ( //Progress indicates a story is currenty being ...

My Tables: Product: id, name Offer: id, value, product_id Entities: @Entity @Table(name="product") public class Product implements Serializable { @OneToMany(mappedBy="product") private Set&lt...

This seems like a common enough case, but as JPA newbie, I am having trouble figuring this out. I'm using EclipseLink and PostgreSQL, but this should relate to just the JPA spec. I have one table ...

I have a Garage which contains Cars and Motorcycles. Cars and motorcycles are Vehicles. Here they are: public class Garage { public int Id { get; set; } public virtual List<Car> Cars { get...

I am developing simple API for practice project Online Shopping System. I am totally new in Spring Boot framework and creating API. I want to return JSON similar to this: [ { "id": 1, "name":...

I have a one-to-many map class - MyMap1N<WeakPtr_Parent,WeakPtr_Children>. By design, it is supposed to store weak pointers of game-related instance. Roughly speaking, it is called like :- ...

I can't seem to resolve my mapping issue; The relationship is one user may have many venues, A venue must have a user. My venue class looks like: public class Venue : BaseObject, IBaseObject { [...

I have a Parent with a OneToMany associations with a Child Table. I'm trying to write a query with CriteriaBuilder to restrict the results returned from the Child table. I'm adding a Predicate, s...