Alura - Java and JPA course: Persist your objects with JPA2 and Hibernate

This is the code that I've developed following the course. I've made some changes in the original one.

Content

Introduction to JPA and Hibernate

• Working with the database
• The object-oriented paradigm
• Avoiding SQL within Java code
• JDBC and SQL maintenance issues
• Persist objects without writing SQL
• Joining the two worlds through Relational Object Mapping
• The Java Persistence API (JPA)
• The first example with JPA
• abstract

Configuring and Booting the JPA

• JPA and Hibernate Libraries
• Preparing the model
• The first Entity
• Bank preparation and schema generation
• Initialization of JPA and Hibernate
• Transaction Management
• Persisting entities in the bank

State Management by EntityManager

• Introduction
• Load entity by primary key
• Managed Entities, Managed Status
• Persisting transient objects
• Update Detached Objects
• Removing EntityManager Entities
• Summary of states

Mapping relationships between entities

• Relationship between Entities
• Relating the Move to an Account
• Dealing with dates
• Defining the cardinality of the relationship
• Persisting objects involved in relationships
• Dealing with TransientPropertyException

Relationship Many to Many and One to One

• Cataloging the drives through Categories
• Saving more information about our customers

Object-oriented searching with JPQL

• Queries with the Java Persistence Query Language
• Object-oriented searches
• Creating and Running Queries
• Problems using JPQL
• Working with parameters in JPQL query in a secure way
• Using Named Parameters
• Sorting search results
• Improving our filter
• abstract

Two-way relationships and LAZY behavior

• Why two-way relationships?
• Navigating the relationship without Join
• Setting One-To-Many Relationship
• The difference in relationships in the OO and relational world
• Declaring the relationship as bidirectional
• Update the database schema
• Testing the bidirectional relationship
• The problem of N + 1 queries and how to solve
• LAZY Behavior of Para-Many Relationships
• Just out of curiosity, the FetchType.EAGER
• Why were the accounts repeated?
• But after all we want all accounts!

A bit more about queries and JPQL

• Searching with aggregate functions
• Adding the amounts to the account
• Improving Search with TypedQuery
• Searching for the average values

Organizing Your Queries

• Organize your queries with the Data Access Object
• Getting to know the Named Queries