Spring Data Repositories - A Deep Dive

Transcript

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   Spring Data Repositories A Deep Dive Oliver Gierke

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   Oliver Gierke SpringSource Spring Data modules Core / JPA /

   Mongo ogierke@vmware.com www.olivergierke.de olivergierke
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   Hands on

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   Sample code https://github.com/olivergierke/ repositories-deepdive

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   Step 0 Initial project setup

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   Summary Use kickstart projects to ease setup

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   Step 1 Basic JPA infrastructure setup

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   "Persistence technology of choice is JPA. e application uses JavaConfig

   and sample data contained in data.sql.
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   Summary Easy setup through JavaConfig XML-less JPA configuration

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    Step 2 Quickstart

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    "e implementation of the persistence layer will be based on

    the Spring Data repositories abstraction. Customers can be saved, looked up by their id, email address.
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    Summary Interface-based programming model No implementation required Queries derived from

    method names
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    Step 3 Extended CRUD methods

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    " Customers can be deleted and obtained all at once.

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    Summary Switched to CrudRepository Exposed CRUD methods Broad API exposed

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    Step 4 Pagination

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    "Customers can be accessed page by page.

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    Summary Switched to PagingAndSortingRepository Exposed CRUD methods and paging ones

    Broad API exposed
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    Step 5 Re-declaring existing CRUD methods

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    "CustomerRepository.findAll() should rather return a List. e transaction timeout for

    save(…) should be customized to 10 seconds.
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    Summary Re-declare methods to customize Return types Annotation config (Tx,

    Locking)
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    Step 6 Introducing a read-only repository base interface

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    "Products shall be accessible in read-only mode only.

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    Summary Craft custom base interface Return types Annotation config (Tx,

    Locking)
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    Step 7 Using manually defined queries

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    "As a user, I want to look up products by

    their custom attributes.
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    Summary @Query annotation JPA named queries Spring Data named queries

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    Step 8 Flexible predicate execution

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    "As a user, I want to search for customers by

    firstname, lastname, email address and any combination of them
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    Summary Querydsl - type safe queries for Java QuerydslPredicateExecutor

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    Side track: Repository proxies

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    Proxy mechanism Using Spring's JDK proxy support Bootstrap through Factory

    Spring FactroyBean / CDI XML namespace / @EnableRepositories
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    Proxy mechanism Query interface CRUD implementation class QueryDslPredicateExecutor Custom implementation

    extension
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    Step 9 Custom implementations for repositories

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    "As an admin user, I'd like to delete all products

    beyond a given price.
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    Summary Provide custom implementation Base class support (Querydsl)

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    Stuff on top Spring MVC integration Spring Data REST Spring

    Roo
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    Up and beyond

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    Supported modules JPA MongoDB Neo4j Gemfire

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    Community implementations Spring Data Solr Couchbase Elasticsearch FuzzyDB

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    Summary

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    Interface-based programming model

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    Start simple, get more sophisticated

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    Declarative query execution

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    Flexible predicate execution

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    Custom implementation

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    CDI integration

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    Spring Data Modern Data Access For Enterprise Java NoSQL JPA

    JDBC Redis Big Data Hadoop HBase MongoDB Neo4j REST exporter Roo Hive Pig Querydsl Repositories Gemfire Splunk Free JPA chapter - http://bit.ly/sd-book-chapter
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    Spring Data Book http://bit.ly/sd-book

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    Questions?

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    Thank you!

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    Code https://github.com/olivergierke/ repositories-deepdive https://github.com/olivergierke/ spring-restbucks