Netz00 / Spring-Data-projections-example

Simple student-subject-teacher REST API in spring boot demonstrating Spring Data projections usage.

Simple Spring Boot application

This application demonstrates usage of:

• JHipster "best practices"

  • yaml configuration
  • file structure
  • JPA relationships...

• Spring MVC

• Spring Security

• Spring Data JPA

• H2

  • embedded

• PostgreSQL

  • Docker image

• Swagger

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Problem:
"I want fetch only student entities and no relationships while fetching ALL students,
but while fetching single student I want to fetch Student relationships too(Subjects)"

Solutions:

• Projections:
  • in order to optimise queries there are "lightweight" projections of domain objects
• Another approach:
  • static fetch = FetchType.LAZY is unable to achieve this dynamic behaviour at runtime,
    but in combination with @EntityGraph(attributePaths = "...") it can be done