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Introduction to Spring DataGreg Turnquist

@gregturn

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Who am I?

2

GregLTurnquist.com/learning-spring-boot

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It’s 2016

3

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It’s 2016

4

Why are we still writing…select * from EMPLOYEE where FIRST_NAME = %1select e from Employee e where e.firstName = :name create

.select()

.from(EMPLOYEE)

.where(EMPLOYEE.FIRST_NAME .equal(name))

.fetch()

SQL

JPA

jOOQ

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When we could write…

5

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Spring Data provides…

6relational non-relational

Spring Data

Elastic

Solr

Neo4jCassandra

MongoDB GemfireRedis

Couchbase

abst

ract

ion

JDBC

JPA

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Dialing it up

7

interface EmployeeRepository extends CrudRepository<Employee, Long> {

List<Employee> findByLastName(String f) List<Employee> findByFirstNameAndLastName(String f, String l) List<Employee> findByFirstNameAndManagerName(String f, String m) List<Employee> findTop10ByFirstName(…) // or findFirst10ByFirstName List<Employee> findDistinctEmployeesByFirstName(...) List<Employee> findByFirstNameAndLastNameAllIgnoreCase(...) List<Employee> findByFirstNameOrderByLastNameAsc(...) List<Employee> findByLastNameIsNull(...) }

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Why stop there?

8

interface CoolRepo extends CrudRepository<Employee, Long> { Stream<Employee> findByLastname(String lastname) @Async Future<Employee> findByLastname(…) @Async CompletableFuture<Employee> findByLastname(…) @Async ListenableFuture<Employee> findByLastname(…)

Page<Employee> findAll(Pageable p) Page<Employee> findByFirstName(String f, Pageable p) List<Employee> findAll(Sort s) Page<Employee> findByFirstName(String f, Pageable p, Sort s) }

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Coming soon…

9

interface ReactiveStreamsRepo extends CrudRepository<Employee, Long> {

Mono<Employee> findByLastname(String lastname) Flux<Employee> findByLastname(…) }

Integration with Spring 5 + Project Reactor

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Spring Data Demo

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Introduction to Spring Data

Visit spring.io/guides, type “data”, and enjoy!

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