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Spring Data Repositories - A Deep Dive
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Oliver Drotbohm
April 04, 2013
Programming
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Spring Data Repositories - A Deep Dive
Slides of my talk at BedCon 2013 in Berlin, Germany.
Oliver Drotbohm
April 04, 2013
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Transcript
Spring Data Repositories A Deep Dive Oliver Gierke
Oliver Gierke Spring Data engineer Core / JPA / Mongo
JPA Expert Group
[email protected]
www.olivergierke.de olivergierke
Hands on
Sample code https://github.com/olivergierke/ repositories-deepdive
Step 0 Initial project setup
Summary Use kickstart projects to ease setup
Step 1 Basic JPA infrastructure setup
"Persistence technology of choice is JPA. e application uses JavaConfig
and sample data contained in data.sql.
Summary Easy setup through JavaConfig XML-less JPA configuration
Step 2 Quickstart
"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.
Summary Interface-based programming model No implementation required Queries derived from
method names
Step 3 Extended CRUD methods
" Customers can be deleted and obtained all at once.
Summary Switched to CrudRepository Exposed CRUD methods Broad API exposed
Step 4 Pagination
"Customers can be accessed page by page.
Summary Switched to PagingAndSortingRepository Exposed CRUD methods and paging ones
Broad API exposed
Step 5 Re-declaring existing CRUD methods
"CustomerRepository.findAll() should rather return a List. e transaction timeout for
save(…) should be customized to 10 seconds.
Summary Re-declare methods to customize Return types Annotation config (Tx,
Locking)
Step 6 Introducing a read-only repository base interface
"Products shall be accessible in read-only mode only.
Summary Craft custom base interface Annotation config (Tx, Locking)
Step 7 Using manually defined queries
"As a user, I want to look up products by
their custom attributes.
Summary @Query annotation JPA named queries Spring Data named queries
Step 8 Flexible predicate execution
"As a user, I want to search for customers by
firstname, lastname, email address and any combination of them
Summary Querydsl - type safe queries for Java QuerydslPredicateExecutor
Side track: Repository proxies
Proxy mechanism Using Spring's JDK proxy support Bootstrap through Factory
Spring FactroyBean / CDI XML namespace / @EnableRepositories
Proxy mechanism Query interface CRUD implementation class QueryDslPredicateExecutor Custom implementation
extension
Step 9 Custom implementations for repositories
"As an admin user, I'd like to delete all products
beyond a given price.
Summary Provide custom implementation Base class support (Querydsl)
Stuff on top Spring MVC integration Spring Data REST Spring
Roo
Up and beyond
Supported modules JPA MongoDB Neo4j Gemfire
Community implementations Spring Data Solr Couchbase Elasticsearch FuzzyDB
Summary
Interface-based programming model
Start simple, get more sophisticated
Declarative query execution
Flexible predicate execution
Custom implementation
CDI integration
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
Spring Data Book http://bit.ly/sd-book
Questions?
Thank you!
Code https://github.com/olivergierke/ repositories-deepdive https://github.com/olivergierke/ spring-restbucks