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)

SQL Group By

SQL Group By

After having talked about all the SQL Aggregate functions, there's one more topic that goes hand in hand with what we've already learned… The group by keyword. This particular keyword allows us to ta...

16 Kesä 201447min

SQL Aggregate Functions

SQL Aggregate Functions

In today's podcast episode you'll be learning all about the aggregate functions that exist in SQL. What the heck is an aggregate function? Well that's what I'm going to try and teach you today, and I...

5 Kesä 201432min

Database Joins

Database Joins

There are three categories of joins that you can make use of in SQL: Inner Join Outer Join Cross Join But before we dive into the categories of joins, we first need to have an understanding ...

28 Touko 201457min

Enforcing Database Relationships Part II

Enforcing Database Relationships Part II

In this SQL tutorial episode/post we're going to learn how to enforce our SQL relationships that we've already learned about. We're going to be tackling the one-to-one and many-to-many relationships a...

23 Touko 201455min

Creating Database Tables in MySQL

Creating Database Tables in MySQL

You've learned all about how to create sql queries to read, write, update and delete data… but you haven't yet learned how to create the tables where you'll be doing the reading, writing, updating and...

14 Touko 20141h 2min

Database Relationships: Many-to-Many and One-to-One

Database Relationships: Many-to-Many and One-to-One

Show Notes available via: http://howtoprogramwithjava.com/session43 In this post we will be expanding on the topic of database relationships and touch on two that are less common but just as useful....

14 Touko 201444min

Database Relationships – One to Many

Database Relationships – One to Many

We've talked about relational databases already, and we've learned why this type of database management really dovetails with the object oriented programming model. So now I want to dive into the spe...

12 Joulu 201332min

Database Terminology - Relationships, Joins and Keys

Database Terminology - Relationships, Joins and Keys

Terminology It's the foundation when learning any new concepts. In this episode of the "How to Program with Java Podcast" we will be talking about some new database terminology. One of the most impor...

4 Joulu 20130s

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