Show how to use Limit with repository queries.

Add methods taking a Limit parameter to various samples.

Original pull request: #672
Closes #671

r2dbc/example/src/main/java/example/springdata/r2dbc/basics/CustomerRepository.java

@@ -15,6 +15,7 @@
  */
 package example.springdata.r2dbc.basics;
 
+import org.springframework.data.domain.Limit;
 import reactor.core.publisher.Flux;
 
 import org.springframework.data.r2dbc.repository.Query;
@@ -28,4 +29,6 @@ interface CustomerRepository extends ReactiveCrudRepository<Customer, Long> {
 
 	@Query("select id, firstname, lastname from customer c where c.lastname = :lastname")
 	Flux<Customer> findByLastname(String lastname);
+
+	Flux<Customer> findByLastname(String lastname, Limit limit);
 }

r2dbc/example/src/test/java/example/springdata/r2dbc/basics/TransactionalServiceIntegrationTests.java

@@ -15,6 +15,7 @@
  */
 package example.springdata.r2dbc.basics;
 
+import org.springframework.data.domain.Limit;
 import reactor.core.publisher.Hooks;
 import reactor.test.StepVerifier;
 
@@ -72,6 +73,25 @@ class TransactionalServiceIntegrationTests {
 				.verifyComplete();
 	}
 
+	@Test
+	void limitResultSize() {
+
+		service.save(new Customer(null, "Carter", "Matthews")) //
+				.as(StepVerifier::create) //
+				.expectNextMatches(Customer::hasId) //
+				.verifyComplete();
+
+		service.save(new Customer(null, "Evad", "Matthews")) //
+				.as(StepVerifier::create) //
+				.expectNextMatches(Customer::hasId) //
+				.verifyComplete();
+
+		repository.findByLastname("Matthews", Limit.of(1)) //
+				.as(StepVerifier::create) //
+				.expectNextCount(1)
+				.verifyComplete();
+	}
+
 	@Test // #500
 	void insertsDataTransactionally() {