Top "One-to-many" questions

What's the difference between @JoinColumn and mappedBy when using a JPA @OneToMany association

What is the difference between: @Entity public class Company { @OneToMany(cascade = CascadeType.ALL , fetch = FetchType.LAZY) @JoinColumn(name = "companyIdRef", referencedColumnName = "…

java hibernate jpa orm one-to-many

Hibernate throws MultipleBagFetchException - cannot simultaneously fetch multiple bags

Hibernate throws this exception during SessionFactory creation: org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags This is my test …

java hibernate jpa one-to-many bag

What is the meaning of the CascadeType.ALL for a @ManyToOne JPA association

I think I misunderstood the meaning of cascading in the context of a @ManyToOne relationship. The case: public class User { @…

java jpa one-to-many cascade many-to-one

JPA OneToMany and ManyToOne throw: Repeated column in mapping for entity column (should be mapped with insert="false" update="false")

I have three classes one of the names is User and this user has other classes instances. Like this; public …

java hibernate jpa one-to-many many-to-one

Laravel - Form Input - Multiple select for a one to many relationship

One of the requirements in an application that I am building is for a form input which takes in a …

php forms laravel one-to-many

Difference Between One-to-Many, Many-to-One and Many-to-Many?

Ok so this is probably a trivial question but I'm having trouble visualizing and understanding the differences and when to …

java hibernate orm many-to-many one-to-many

What is “the inverse side of the association” in a bidirectional JPA OneToMany/ManyToOne association?

In the example section of the @OneToMany JPA annotation reference: Example 1-59 @OneToMany - Customer Class With Generics @Entity public …

java hibernate jpa one-to-many mappedby

deleted object would be re-saved by cascade (remove deleted object from associations)

i have the following two entities: 1- PlayList: @OneToMany(fetch = FetchType.EAGER, mappedBy = "playlist", orphanRemoval = true, cascade = CascadeType.ALL) @OrderBy("…

hibernate jakarta-ee jpa one-to-many

JPA - Persisting a One to Many relationship

Maybe this is a stupid question but it's bugging me. I have a bi-directional one to many relationship of Employee …

java jpa orm one-to-many

JPA: How to have one-to-many relation of the same Entity type

There's an Entity Class "A". Class A might have children of the same type "A". Also "A" should hold it's …

java orm jpa hierarchy one-to-many