Status

Introduction

This repository is part of my upcoming youtube series Persistence Operations.

This demo project is supposed to give the trainee a brief idea of the concepts.

App

Features

• Spring Boot and Java 14
• H2 in memory

Todos for further versions

Implement demo about:

• https://docs.jboss.org/hibernate/core/3.3/reference/en/html/objectstate.html#objectstate-modifying
• https://stackoverflow.com/questions/2573739/what-are-detached-persistent-and-transient-objects-in-hibernate
• Maybe: DUAL Demo
• Queries: https://www.baeldung.com/spring-data-jpa-query
• optimistic (with @Version) vs. pessimistic locking, see https://www.baeldung.com/jpa-optimistic-locking plus https://stackoverflow.com/questions/58786195/what-is-the-relation-between-spring-transactional-and-spring-lock-annotation/

Execute

Main program

Run the main method in each module.

Manual sequence try out

To get familiar with the sequence table feel free to create a datasource with intelliJ with the following steps:

Open a new query console and execute

CREATE TABLE PERSON
(
  EMAIl      VARCHAR(255) PRIMARY KEY NOT NULL,
  FIRST_NAME VARCHAR(255)             NOT NULL,
  LAST_NAME  VARCHAR(255)             NOT NULL
);

Articles

Transactions

https://dzone.com/articles/spring-transaction-propagation

https://docs.spring.io/spring-framework/docs/current/reference/html/data-access.html#transaction-declarative

Isolations

https://www.postgresql.org/docs/9.5/transaction-iso.html

Hibernate

https://docs.jboss.org/hibernate/core/3.3/reference/en/html/objectstate.html#objectstate-modifying

https://docs.spring.io/spring-boot/docs/2.1.0.M1/reference/html/howto-database-initialization.html

Parent & Child POM

http://maven.apache.org/pom.html#Inheritance

https://howtodoinjava.com/maven/maven-parent-child-pom-example