Spring Data Repositories - A Deep Dive

Slides of my talk at SpringOne2GX 2012.

Transcript

1. Spring Data Repositories A Deep Dive Oliver Gierke, Senior Member Technical Staff ogierke@vmware.com - @olivergierke © 2012 SpringOne 2GX. All rights reserved. Do not distribute without permission.
2. 2 Oliver Gierke Spring Source engineer Project lead Core/JPA/MongoDB ogierke@vmware.com www.olivergierke.de olivergierke
3. 3 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 1 free copy per attendee! Gemfire Splunk
4. 4 Hands on
5. Sample code https://github.com/olivergierke/repositories-deepdive 5
6. 6 Step 0 Initial project setup
7. 7 Summary Use kickstart projects to ease setup
8. 8 Step 1 Basic JPA infrastructure setup
9. 9 " Persistence technology of choice is JPA. e application uses JavaConfig and sample data contained in data.sql.
10. 10 Summary Easy setup through JavaConfig XML-less JPA configuration
11. 11 Step 2 Quickstart
12. 12 " 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.
13. 13 Summary Interface-based programming model No implementation required Queries derived from method names
14. 14 Step 3 Extended CRUD methods
15. 15 " Customers can be deleted and obtained all at once.
16. 16 Summary Switched to CrudRepository Exposed CRUD methods Broad API exposed
17. 17 Step 4 Pagination
18. 18 " Customers can be accessed page by page.
19. 19 Summary Switched to PagingAndSortingRepository Exposed CRUD methods and paging ones Broad API exposed
20. 20 Step 5 Re-declaring existing CRUD methods
21. 21 " CustomerRepository.findAll() should rather return a List. e transaction timeout for save(…) should be customized to 10 seconds.
22. 22 Summary Re-declare methods to customize Return types Annotation config (Tx, Locking)
23. 23 Step 6 Introducing a read-only repository base interface
24. 24 " Orders shall be accessible in read-only mode only.
25. 25 Summary Craft custom base interface Return types Annotation config (Tx, Locking)
26. 26 Step 7 Using manually defined queries
27. 27 " As a user, I want to look up products by their custom attributes.
28. 28 Summary @Query annotation JPA named queries Spring Data named queries
29. 29 Step 8 Flexible predicate execution
30. 30 " As a user, I want to search for customers by first name, last name, email address and any combination of them
31. 31 Summary Querydsl - type safe queries for Java QuerydslPredicateExecutor
32. Side track: Repository proxies 32
33. Proxy mechanism Using Spring's JDK proxy support Bootstrap through Factory Spring FactroyBean / CDI XML namespace / @EnableRepositories 33
34. Proxy mechanism Query interface CRUD implementation class QueryDslPredicateExecutor Custom implementation extension 34
35. 35 Step 9 Custom implementations for repositories
36. 36 " As an admin user, I'd like to delete all products beyond a given price.
37. 37 Summary Provide custom implementation Base class support (Querydsl)
38. Stuff on top Spring MVC integration Spring Data REST Spring Roo 38
39. Up and beyond 39
40. 40 Supported modules JPA MongoDB Neo4j Gemfire
41. 41 Community implementations Spring Data Solr FuzzyDB (Cassandra)
42. 42 Further sessions Spring Data and Data Grids - Wed, 12:45pm Spring Data Neo4j - Wed, 2:45pm Lightning Talks - Wed, 4:30pm Spring Data REST - Thu, 12:45pm
43. Summary 43
44. Interface-based programming model 44
45. Start simple, get more sophisticated 45
46. Declarative query execution 46
47. Flexible predicate execution 47
48. Custom implementation 48
49. CDI integration 49