Roberta  Ward

Roberta Ward

1599294840

Inheritance Mapping with JPA/Hibernate

When generating a database using JPA, one of the most important things we have to do is mapping inheritances. In this post, you are going to learn some basic things that we have to know when mapping inheritance.

Image for post

Inheritance

For the ScholarX project, I had to add JPA annotations to the spring-boot project in order to generate the MySQL database. The models had already been created for the entities. To initiate the task, I was given a class diagram. Otherwise, it might be so hard to find data types, relationships, etc. Click here if you wanna find out what a class diagram is.


Okay then… back to the topic. JPA has several inheritance strategies.

  • MappedSuperclass
  • Single Table
  • Joined Table
  • Table-Per-Class

If you have checked our class diagram you may notice that we have a base modal called “BaseScholarxModel” for all entities. And there’s another parent called “EnrolledUser” extended by the base modal. We don’t need tables for these two models. Therefore I had to make use of those different strategies mentioned above.

Image for post

A section of the class diagram

#programming #hibernate #spring #jpa #object-oriented

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Inheritance Mapping with JPA/Hibernate
Roberta  Ward

Roberta Ward

1599294840

Inheritance Mapping with JPA/Hibernate

When generating a database using JPA, one of the most important things we have to do is mapping inheritances. In this post, you are going to learn some basic things that we have to know when mapping inheritance.

Image for post

Inheritance

For the ScholarX project, I had to add JPA annotations to the spring-boot project in order to generate the MySQL database. The models had already been created for the entities. To initiate the task, I was given a class diagram. Otherwise, it might be so hard to find data types, relationships, etc. Click here if you wanna find out what a class diagram is.


Okay then… back to the topic. JPA has several inheritance strategies.

  • MappedSuperclass
  • Single Table
  • Joined Table
  • Table-Per-Class

If you have checked our class diagram you may notice that we have a base modal called “BaseScholarxModel” for all entities. And there’s another parent called “EnrolledUser” extended by the base modal. We don’t need tables for these two models. Therefore I had to make use of those different strategies mentioned above.

Image for post

A section of the class diagram

#programming #hibernate #spring #jpa #object-oriented

Types of Inheritance in Python | Python Inheritance [With Example] | upGrad blog

Introduction

The struggle for a clean code is a battle joined by all the programmers. And that battle can be conquered with a proper armour of object-oriented programming concepts. And proper utilization of OOP concepts helps us to improve code reusability, readability, optimal time and space complexity.

Coding in Python is super fun. It has a whopping number of library support, object-oriented, GUI programmability makes it a hot cake among all the programming languages.

Inheritance is one of the most utilized object-oriented features and implementing it in python is an enthusiastic task. So, let’s start now!

First things first let’s understand the definition of inheritance.

#data science #inheritance #inheritance in python #python #types of inheritance #types of inheritance in python

Layla  Gerhold

Layla Gerhold

1590809420

A Guide to JPA with Hibernate - Relationship Mapping

In this article, we’ll dive into Relationship Mapping with JPA and Hibernate in Java.
JPA is the persistence standard of the Java ecosystem. It allows us to map our domain model directly to the database structure and then gives us the flexibility of manipulating objects in our code - instead of messing with cumbersome JDBC components like Connection, ResultSet, etc.

#java #hibernate #database #jpa

Map Enum Type to Column in Hibernate JPA

How to map an enumeration type (Enum) in Java to a Column in database with Hibernate/JPA with two cases:
- The column stores string values
- The column stores number values

#hibernate #jpa 

 

Zena  Sporer

Zena Sporer

1596961287

Hibernate Tutorial — 1. Setup & Configuration

In this post, I will talk about the stup and configuration of Hibernate, one of the most used Object-Relational Mapping (ORM) tool. I have already talked about what is ORM, what are the advantages and the drawbacks of using ORM in my previous post.
As recommended on the website of Hibernate, I will use Maven to setup Hibernate. Since the subject of my post is about Hibernate, I won’t be explaining Maven here. Also, I will use MySQL in the further examples as my choice of database.
First, we are opening a Maven project and in pom.xml file we are adding the necessary dependencies to use Hibernate.

#hibernate-maven #hibernate-configuration #hibernate-setup #hibernate