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Day 4

JPA, Hibernate, Spring Data

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Object Relational Mapper (ORM)

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Object Relational Mapper (ORM)

  • Map a POJO to a relational database table
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Object Relational Mapper (ORM)

  • Map a POJO to a relational database table
  • Create and populate a POJO -> save it to the db
2 / 8

Object Relational Mapper (ORM)

  • Map a POJO to a relational database table
  • Create and populate a POJO -> save it to the db
  • Run query using ORM -> executes SQL -> turns results into a POJO and returns it
2 / 8

Object Relational Mapper (ORM)

  • Map a POJO to a relational database table
  • Create and populate a POJO -> save it to the db
  • Run query using ORM -> executes SQL -> turns results into a POJO and returns it
  • NOTE: there are other mapping tools that don't rely on using a relational database
  • A better name may be Object Data-Store Mapper (ODM)
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JPA

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JPA

  • The Java Persistence API provides a POJO persistence model for object-relational mapping
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JPA

  • The Java Persistence API provides a POJO persistence model for object-relational mapping
  • Does NOT contain implementations, only the interfaces for persisting POJOs
3 / 8

JPA

  • The Java Persistence API provides a POJO persistence model for object-relational mapping
  • Does NOT contain implementations, only the interfaces for persisting POJOs
3 / 8

JPA

  • The Java Persistence API provides a POJO persistence model for object-relational mapping
  • Does NOT contain implementations, only the interfaces for persisting POJOs- Interfaces defined in javax.persistence package
3 / 8

JPA

  • The Java Persistence API provides a POJO persistence model for object-relational mapping
  • Does NOT contain implementations, only the interfaces for persisting POJOs- Interfaces defined in javax.persistence package
  • First released in 2006
3 / 8

JPA

  • The Java Persistence API provides a POJO persistence model for object-relational mapping
  • Does NOT contain implementations, only the interfaces for persisting POJOs- Interfaces defined in javax.persistence package
  • First released in 2006
  • Implementations of JPA: Hibernate, EclipseLink, DataNucleus...
3 / 8

Hibernate

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Hibernate

  • Is an implementation of JPA (Also known as a JPA provider)
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Hibernate

  • Is an implementation of JPA (Also known as a JPA provider)
  • Hibernate existed before JPA and was a major influence on the JPA standard
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Hibernate

  • Is an implementation of JPA (Also known as a JPA provider)
  • Hibernate existed before JPA and was a major influence on the JPA standard
  • Hibernate is the default JPA implementation used by Spring Boot
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Hibernate

  • Is an implementation of JPA (Also known as a JPA provider)
  • Hibernate existed before JPA and was a major influence on the JPA standard
  • Hibernate is the default JPA implementation used by Spring Boot
  • When you include org.springframework.boot:spring-boot-starter-data-jpa in your build.gradle
    • Gradle downloads org.hibernate packages because they are listed as a dependency to spring-data-jpa
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Spring Data

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Spring Data

  • Umbrella project which contains many subprojects that are specific to a given database/data-store
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Spring Data

  • Umbrella project which contains many subprojects that are specific to a given database/data-store
  • Can be used with relational and non-relational databases (NoSQL), map-reduce frameworks, and cloud-based data services
5 / 8

Spring Data

  • Umbrella project which contains many subprojects that are specific to a given database/data-store
  • Can be used with relational and non-relational databases (NoSQL), map-reduce frameworks, and cloud-based data services
5 / 8

Spring Data JPA

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Spring Data JPA

  • Subproject of Spring Data
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Spring Data JPA

  • Subproject of Spring Data
  • Makes it easy to implement JPA-based repositories (JPA = ORM = Relational Database)
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Spring Data JPA

  • Subproject of Spring Data
  • Makes it easy to implement JPA-based repositories (JPA = ORM = Relational Database)
  • Defined in package org.springframework.data.jpa
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Spring Data JPA

  • Subproject of Spring Data
  • Makes it easy to implement JPA-based repositories (JPA = ORM = Relational Database)
  • Defined in package org.springframework.data.jpa
  • Provides things like: org.springframework.data.jpa.repository.JpaRepository which provides a load of persistence magic
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Database Migrations

  • When you do the below... as part of a build/deployment
7 / 8

Database Migrations

  • When you do the below... as part of a build/deployment

    • create a database
    • alter table(s), column(s), constraint(s)
    • insert data
    • translate data

  • The database changes have to be rolled out with the new code files changes

7 / 8

Database Migrations

  • When you do the below... as part of a build/deployment

    • create a database
    • alter table(s), column(s), constraint(s)
    • insert data
    • translate data

  • The database changes have to be rolled out with the new code files changes

  • The code won't work without an updated data source
7 / 8

Database Migrations

  • When you do the below... as part of a build/deployment

    • create a database
    • alter table(s), column(s), constraint(s)
    • insert data
    • translate data

  • The database changes have to be rolled out with the new code files changes

  • The code won't work without an updated data source
  • Spring will carry out (most) migrations for you as long as application.properties has spring.jpa.hibernate.ddl-auto=update
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Spring Data & Hibernate Walkthrough

8 / 8

Object Relational Mapper (ORM)

2 / 8
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