Hibernate @OneToMany Bidirectional Relationship

Hibernate @OneToMany Bidirectional Relationship

Since we've already learned about the unidirectional @ManyToOne relationship, we can now move on to talking about what a bidirectional relationship is like, when using Hibernate. The term "bidirectional" literally means "functioning in two directions", which is the concept that we will apply in our relationships between two Java objects. When we have a bidirectional relationship between objects, it means that we are able to access Object A from Object B, and Object B from Object A. We can apply this logic to our real world coding example that we saw in the last post. The example we will use is the relationship between an Employer and an Employee. Previously, we only defined a unidirectional relationship, so we could only access the Employer from the Employee object and not vice-versa. Now let's take a look at how to transform our existing unidirectional relationship into a bidirectional one.

Jaksot(112)

EP 64: CSS 101 Tutorial

EP 64: CSS 101 Tutorial

Cascading Style Sheets are a bit of a tricky beast in HTML. Given this fact, I wanted to dedicate an entire section to just this topic. Let's start with the basics, shall we? What are Cascading Styl...

17 Marras 201444min

EP 63: HTML Styles 101

EP 63: HTML Styles 101

In this HTML tutorial I would like to introduce two concepts to you: DOCTYPE Styles The DOCTYPE Currently as of the date this was published, web browsers are (mostly) supporting HTML 5. HTML has...

4 Marras 201448min

EP 62: Introduction to HTML

EP 62: Introduction to HTML

I'm so ridiculously excited to be introducing a whole new aspect of programming. Over the next few months I will be posting new articles on the topics of HTML, Javascript and jQuery. These are all tec...

29 Loka 201434min

HTML, CSS and JavaScript - Oh My!

HTML, CSS and JavaScript - Oh My!

The presentation layer is one of the three main layers in object-oriented programming. The three main layers include: Presentation Layer Business Layer Data Layer Now, these three layers are typical...

20 Loka 201440min

Hibernate Group By

Hibernate Group By

In our last Hibernate lesson, you learned how to fix duplicate data from hibernate queries. In this lesson we're going to focus on some of theaggregate functions that can be used with Hibernate, and ...

10 Loka 201443min

Fixing Duplicate Data from Hibernate Queries

Fixing Duplicate Data from Hibernate Queries

How to Fix Duplicate Data from Hibernate Queries This problem was the bane of my existence when I first started using Hibernate because I had no idea where the problem was coming from. If you're exe...

15 Syys 201431min

Hibernate Persistence Life Cycle

Hibernate Persistence Life Cycle

Now it's time to dive into the nitty gritty of Hibernate's mysterious inner workings. I'm by no means an expert in Hibernate, but I do use it almost every day for my own projects, so I do know a thin...

5 Syys 201442min

Fetch Type Lazy Vs Eager

Fetch Type Lazy Vs Eager

What the heck is a Fetch Type? Great question! Hibernate is a very handy framework for removing your need to fully understand SQL, but it will force you to understand things such as joins. Joining t...

27 Elo 201429min

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