Hibernate (ORM Tool)

What is Hibernate?
Hibernate is a tool that helps resolves many object-relational issues that helps simplify common methods like the Create, Retrieve, Update, Delete queries that are used towards your relational database. This is simplified because without the use of this tool, programmers would spend additional time recreating their own methods to retrieve rows with different data types: Varchar → String, even int → int and vice-versa.

In Java, variables are strongly typed, meaning the variables must be declared with their data types before they can be used in any matter, so by using Hibernate, this is one of the main solutions that this ORM tool provides.


What is an ORM tool?

ORM stands for Object-Relational Mapping a programming technique used to convert datatypes between two incompatible type systems, and Hibernate is one of these tools. An ORM tool acts as your bridge between your database and application where your classes in Java (or whichever object-oriented programming language you are using) correspond to their own tables in a database, and the objects you create correspond to rows within that table, where the attributes become your fields.

Your application would hand-over the object to Hibernate, which internally uses JDBC to communicate to your relational database within MYSQL or SQL server for persistence.


Why would you want to use Hibernate?

Advantages that Hibernate brings is that it helps do things for you. You wouldn’t have to worry about creating different datatypes to accommodate all the different data types and create your own to match them.

It also helps eliminate many uses of basic SQL queries, and allows you to use methods integrated through Hibernate to allow more cleaner handling of objects. Creating an employee object for instance, you would be able to setup a table and entry by just creating the class and using your setters to create the object, from there, Hibernate will takeover and do the rest.

Now as I mentioned before, Hibernate will only solve a lot of the basic functions of SQL queries. It will help a lot in managing code, but it won’t solve all your problems. As a certain case when working within a team and a scale of a project that uses more than several tables, Hibernate will definitely save you time, but there will still be very complicated scenarios which may require you to use more SQL queries that Hibernate won’t be able to manage for you.