├── project ├── build.properties └── plugins.sbt ├── .travis.yml ├── .scalafmt.conf ├── .gitignore ├── src └── test │ └── scala │ └── example │ ├── PostgreSQLSpec.scala │ └── H2Spec.scala ├── README.md └── LICENSE.txt /project/build.properties: -------------------------------------------------------------------------------- 1 | sbt.version=1.2.7 2 | -------------------------------------------------------------------------------- /project/plugins.sbt: -------------------------------------------------------------------------------- 1 | scalacOptions ++= Seq("-unchecked", "-deprecation", "-feature") 2 | 3 | // Code formatter for Scala 4 | // https://scalameta.org/scalafmt/ 5 | addSbtPlugin("com.geirsson" % "sbt-scalafmt" % "1.5.1") 6 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: scala 2 | sudo: false 3 | scala: 4 | - 2.12.8 5 | jdk: 6 | - oraclejdk8 7 | - openjdk11 8 | before_script: 9 | - psql -c "CREATE ROLE sa WITH SUPERUSER LOGIN PASSWORD 'sa';" -U postgres 10 | - psql -c "CREATE DATABASE r2dbc;" -U postgres 11 | script: 12 | sbt ++$TRAVIS_SCALA_VERSION scalafmtSbtCheck scalafmtCheck test 13 | -------------------------------------------------------------------------------- /.scalafmt.conf: -------------------------------------------------------------------------------- 1 | style = defaultWithAlign 2 | danglingParentheses = true 3 | indentOperator = spray 4 | includeCurlyBraceInSelectChains = true 5 | maxColumn = 120 6 | rewrite.rules = [RedundantParens, SortImports, PreferCurlyFors] 7 | spaces.inImportCurlyBraces = true 8 | binPack.literalArgumentLists = false 9 | unindentTopLevelOperators = true 10 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .settings 2 | *.db 3 | .classpath 4 | .project 5 | *.iml 6 | *.ipr 7 | *.iws 8 | dist/ 9 | lib_managed/ 10 | project/boot/ 11 | project/plugins/project/ 12 | target/ 13 | 14 | # use glob syntax. 15 | syntax: glob 16 | *.ser 17 | *.class 18 | *~ 19 | *.bak 20 | #*.off 21 | *.old 22 | 23 | # eclipse conf file 24 | .settings 25 | .classpath 26 | .project 27 | .manager 28 | .scala_dependencies 29 | 30 | # idea 31 | .idea 32 | *.iml 33 | 34 | # building 35 | target 36 | build 37 | null 38 | tmp* 39 | temp* 40 | dist 41 | test-output 42 | build.log 43 | .cache 44 | 45 | # other scm 46 | .svn 47 | .CVS 48 | .hg* 49 | 50 | # switch to regexp syntax. 51 | # syntax: regexp 52 | # ^\.pc/ 53 | 54 | #SHITTY output not in target directory 55 | build.log 56 | .DS_Store 57 | derby.log 58 | 59 | db 60 | 61 | .lib 62 | sbt-launch.jar 63 | 64 | logs 65 | 66 | awscala-unit-test-keypair-* 67 | 68 | .ensime* 69 | -------------------------------------------------------------------------------- /src/test/scala/example/PostgreSQLSpec.scala: -------------------------------------------------------------------------------- 1 | package example 2 | 3 | import org.scalatest._ 4 | 5 | class PostgreSQLSpec extends FlatSpec with Matchers { 6 | 7 | case class Sample(id: Long, name: Option[String]) 8 | 9 | "r2dbc" should "work with PostgreSQL" in { 10 | 11 | import io.r2dbc.client.R2dbc 12 | import io.r2dbc.postgresql.{ PostgresqlConnectionConfiguration, PostgresqlConnectionFactory } 13 | 14 | val config = PostgresqlConnectionConfiguration 15 | .builder() 16 | .host("localhost") 17 | .database("r2dbc") 18 | .username("sa") 19 | .password("sa") 20 | .build() 21 | 22 | val r2dbc = new R2dbc(new PostgresqlConnectionFactory(config)) 23 | 24 | import reactor.core.publisher.Flux 25 | 26 | try r2dbc.withHandle(_.execute("drop table sample")).blockFirst() 27 | catch { case scala.util.control.NonFatal(e) => e.printStackTrace() } 28 | 29 | r2dbc 30 | .withHandle(_.execute("create table sample (id bigint primary key, name varchar(100))")) 31 | .blockFirst() 32 | 33 | val result: Flux[Sample] = { 34 | val insertions: Flux[Integer] = r2dbc.inTransaction { handle => 35 | // Identifier '$id' is not a valid identifier. Should be of the pattern '.*\$([\d]+).*' 36 | val updates = handle.createUpdate("insert into sample (id, name) values ($1, $2)") 37 | updates.bind("$1", 1).bind("$2", "Alice").add() 38 | updates.bind("$1", 2).bind("$2", "Bob").add() 39 | updates.bind("$1", 3).bindNull("$2", classOf[String]).add() 40 | updates.execute() 41 | } 42 | val fetchingAll: Flux[Sample] = r2dbc.withHandle { handle => 43 | handle.select("select id, name from sample order by id desc").mapRow { row => 44 | Sample( 45 | id = Long.unbox(row.get("id", classOf[java.lang.Long])), 46 | name = Option(row.get("name", classOf[String])) 47 | ) 48 | } 49 | } 50 | insertions.thenMany(fetchingAll) 51 | } 52 | 53 | // simple example to run with monix-reactive 54 | import monix.reactive.Observable 55 | val observable: Observable[Sample] = Observable.fromReactivePublisher(result) 56 | 57 | import monix.execution.Scheduler.Implicits.global 58 | val samples = observable.toListL.runSyncUnsafe() 59 | samples.size should equal(3) 60 | samples.map(_.id) should equal(Seq(3, 2, 1)) 61 | } 62 | 63 | } 64 | -------------------------------------------------------------------------------- /src/test/scala/example/H2Spec.scala: -------------------------------------------------------------------------------- 1 | package example 2 | 3 | import org.scalatest._ 4 | 5 | class H2Spec extends FlatSpec with Matchers { 6 | 7 | case class Sample(id: Long, name: Option[String]) 8 | 9 | "r2dbc + monix" should "work with H2 database" in { 10 | 11 | import io.r2dbc.client.R2dbc 12 | import io.r2dbc.h2.{ H2ConnectionConfiguration, H2ConnectionFactory } 13 | 14 | val config = H2ConnectionConfiguration.builder().url("mem:sample2").build() 15 | val r2dbc = new R2dbc(new H2ConnectionFactory(config)) 16 | 17 | import reactor.core.publisher.Flux 18 | 19 | r2dbc 20 | .withHandle(_.execute("drop table sample if exists")) 21 | .blockFirst() 22 | r2dbc 23 | .withHandle(_.execute("create table sample (id bigint primary key, name varchar(100))")) 24 | .blockFirst() 25 | 26 | val result: Flux[Sample] = { 27 | val insertions: Flux[Integer] = r2dbc.inTransaction { handle => 28 | // Identifier '$id' is not a valid identifier. Should be of the pattern '.*\$([\d]+).*' 29 | val updates = handle.createUpdate("insert into sample (id, name) values ($1, $2)") 30 | updates.bind("$1", 1).bind("$2", "Alice").add() 31 | updates.bind("$1", 2).bind("$2", "Bob").add() 32 | updates.bind("$1", 3).bindNull("$2", classOf[String]).add() 33 | updates.execute() 34 | } 35 | val fetchingAll: Flux[Sample] = r2dbc.withHandle { handle => 36 | handle.select("select id, name from sample order by id desc").mapRow { row => 37 | Sample(id = Long.unbox(row.get("id", classOf[java.lang.Long])), 38 | name = Option(row.get("name", classOf[String]))) 39 | } 40 | } 41 | insertions.thenMany(fetchingAll) 42 | } 43 | 44 | // simple example to run with monix-reactive 45 | import monix.reactive.Observable 46 | val observable: Observable[Sample] = Observable.fromReactivePublisher(result) 47 | 48 | import monix.execution.Scheduler.Implicits.global 49 | val samples = observable.toListL.runSyncUnsafe() 50 | samples.size should equal(3) 51 | samples.map(_.id) should equal(Seq(3, 2, 1)) 52 | } 53 | 54 | "r2dbc" should "work with H2 database" in { 55 | 56 | import io.r2dbc.client.R2dbc 57 | import io.r2dbc.h2.{ H2ConnectionConfiguration, H2ConnectionFactory } 58 | 59 | val config = H2ConnectionConfiguration.builder().url("mem:sample1").build() 60 | val r2dbc = new R2dbc(new H2ConnectionFactory(config)) 61 | 62 | import reactor.core.publisher.Flux 63 | 64 | r2dbc 65 | .withHandle(_.execute("drop table sample1 if exists")) 66 | .blockFirst() 67 | r2dbc 68 | .withHandle(_.execute("create table sample (id bigint primary key, name varchar(100))")) 69 | .blockFirst() 70 | 71 | val result: Flux[Sample] = { 72 | val insertions: Flux[Integer] = r2dbc.inTransaction { handle => 73 | // Identifier '$id' is not a valid identifier. Should be of the pattern '.*\$([\d]+).*' 74 | val updates = handle.createUpdate("insert into sample (id, name) values ($1, $2)") 75 | updates.bind("$1", 1).bind("$2", "Alice").add() 76 | updates.bind("$1", 2).bind("$2", "Bob").add() 77 | updates.bind("$1", 3).bindNull("$2", classOf[String]).add() 78 | updates.execute() 79 | } 80 | val fetchingAll: Flux[Sample] = r2dbc.withHandle { handle => 81 | handle.select("select id, name from sample order by id desc").mapRow { row => 82 | Sample( 83 | id = Long.unbox(row.get("id", classOf[java.lang.Long])), 84 | name = Option(row.get("name", classOf[String])) 85 | ) 86 | } 87 | } 88 | insertions.thenMany(fetchingAll) 89 | } 90 | 91 | // simple example to run with monix-reactive 92 | import java.util.concurrent.CompletableFuture 93 | val jFuture: CompletableFuture[java.util.List[Sample]] = result.collectList().toFuture 94 | import scala.collection.JavaConverters._ 95 | import scala.compat.java8.FutureConverters._ 96 | import scala.concurrent.ExecutionContext.Implicits.global 97 | import scala.concurrent.duration.Duration 98 | import scala.concurrent.{ Await, Future } 99 | val f: Future[Seq[Sample]] = jFuture.toScala.map(_.asScala) 100 | val allRows: Seq[Sample] = Await.result(f, Duration.Inf) 101 | allRows.size should equal(3) 102 | allRows.map(_.id) should equal(Seq(3, 2, 1)) 103 | } 104 | 105 | } 106 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # R2DBC First Example in Scala 2 | 3 | [![Build Status](https://travis-ci.org/seratch/r2dbc-samples-in-scala.svg?branch=master)](https://travis-ci.org/seratch/r2dbc-samples-in-scala) 4 | 5 | This repository demonstrates how to use [R2DBC - Reactive Relational Database Connectivity](http://r2dbc.io/) in Scala. 6 | 7 | As of Dec 2018, R2DBC is still under the development. Thus, there are still many limitations: 8 | 9 | * Supported RDBMS: PostgreSQL, H2, and MS SQL Server 10 | * CLOB/BLOB unsupported 11 | * No connection pooling 12 | 13 | In this example, I use [`r2dbc-client`](https://github.com/r2dbc/r2dbc-client) which is the reference implementation of [`r2dbc-spi`](https://github.com/r2dbc/r2dbc-spi), the service provider interface. `r2dbc-client` heavily depends on [Reactor](https://projectreactor.io/), whereas the R2DBC SPI doesn't have any relatiojns with Reactor. The SPI relies on only [Reactive Streams](http://www.reactive-streams.org/). Thanks to the thin SPI interface, it should be much easier to implement your own R2DBC clients than toilsome JDBC drivers. 14 | 15 | While working with `r2dbc-client`, you will see lots of [`Flux`](https://projectreactor.io/docs/core/release/api/reactor/core/publisher/Flux.html)/[`Mono`](https://projectreactor.io/docs/core/release/api/reactor/core/publisher/Mono.html) objects. As far as I know, Reactor is not so popular in the Scala world (The Scala community already has many other options to achieve the same goal). You may feel like "What's `Flux`/`Mono`...? Do I need to learn ways to use it?" Don't worry, be happy. You don't need to learn the details of it. They are just enriched `Publisher` objects in the context of Reactive Streams. So, if you're familiar with the `Publisher`, you can simply handle `Flux`/`Mono` as `Publisher`. Otherwise, I recommend transforming those types to your favorites such as [`Observable`](https://monix.io/docs/3x/reactive/observable.html) in [monix-reactive](https://monix.io/docs/3x/#monix-reactive), [`Stream` in fs2](https://fs2.io/guide.html), etc. 16 | 17 | # Getting Started 18 | 19 | ## build.sbt 20 | 21 | `r2dbc-client` is always mandatory. In addition to that, you must have the necessary dialect, any of `r2dbc-h2`, `r2dbc-postgresql`, and `r2dbc-mssql`. Don't forget to have the `spring-milestone` resolver. R2DBC libraries are not available on the Maven Central yet. 22 | 23 | ```scala 24 | // Minimum settings for R2DBC 25 | lazy val root = (project in file(".")) 26 | .settings( 27 | scalaVersion := "2.12.8", 28 | resolvers += "spring-milestone" at "https://repo.spring.io/milestone", 29 | libraryDependencies ++= Seq( 30 | "io.r2dbc" % "r2dbc-client" % "1.0.0.M6" % Compile, 31 | "io.r2dbc" % "r2dbc-h2" % "1.0.0.M6" % Compile, 32 | "io.r2dbc" % "r2dbc-postgresql" % "1.0.0.M6" % Compile 33 | ) 34 | ) 35 | 36 | // You can build Monix's Observable from Flux/Mono instantly 37 | libraryDependencies += "io.monix" %% "monix-reactive" % "3.0.0-RC2" % Compile 38 | 39 | // If you need the ways to convert Flux/Mono to Scala Future 40 | libraryDependencies += "org.scala-lang.modules" %% "scala-java8-compat" % "0.9.0" % Compile 41 | ``` 42 | 43 | ## Code Example 44 | 45 | Here is a simple code example to run queries on H2 in-memory database. Apart from the part to build `io.r2dbc.client.R2dbc`, the exactly same code works for PostgreSQL. 46 | 47 | To make the example simple, the code intentionally does blocking operations. Needless to say, you must NOT do the same in real application code. Follow the best practices to leverage the benefits of reactive / non-blocking model. 48 | 49 | ```scala 50 | val config = io.r2dbc.h2.H2ConnectionConfiguration.builder().url("mem:sample1").build() 51 | val r2dbc = new io.r2dbc.client.R2dbc(new io.r2dbc.h2.H2ConnectionFactory(config)) 52 | 53 | // Create the table beforehand 54 | r2dbc 55 | // Don't use text type, R2DBC doesn't work with it as of Dec 2018 56 | .withHandle(_.execute("create table sample (id bigint primary key, name varchar(100))")) 57 | .blockFirst() // Flux#blockFirst() 58 | 59 | val result: reactor.core.publisher.Flux[Sample] = { 60 | // Insert three rows 61 | val insertions: reactor.core.publisher.Flux[Integer] = r2dbc.inTransaction { handle => 62 | val updates = handle.createUpdate("insert into sample (id, name) values ($1, $2)") 63 | updates.bind("$1", 1).bind("$2", "Alice").add() 64 | updates.bind("$1", 2).bind("$2", "Bob").add() 65 | updates.bind("$1", 3).bindNull("$2", classOf[String]).add() 66 | updates.execute() 67 | } 68 | // Select all the rows descending order 69 | val fetchingAll: reactor.core.publisher.Flux[Sample] = r2dbc.withHandle { handle => 70 | handle.select("select id, name from sample order by id desc").mapRow { row => 71 | Sample( 72 | id = Long.unbox(row.get("id", classOf[java.lang.Long])), 73 | name = Option(row.get("name", classOf[String])) 74 | ) 75 | } 76 | } 77 | // 'fetchingAll' will be executed after the completion of 'insertions' 78 | insertions.thenMany(fetchingAll) 79 | } 80 | ``` 81 | 82 | To work with `Publisher` more easily, you can use `Observable` from `monix-reactive`. Refer to [the Monix document](https://monix.io/docs/3x/reactive/observable.html) for details. 83 | 84 | ```scala 85 | // simple example to run with monix-reactive 86 | import monix.reactive.Observable 87 | val observable: Observable[Sample] = Observable.fromReactivePublisher(result) 88 | 89 | // Just for demonstration, intentionally does the blocking ops here 90 | import monix.execution.Scheduler.Implicits.global 91 | val samples: Seq[Sample] = observable.toListL.runSyncUnsafe() 92 | samples.map(_.id) should equal(Seq(3, 2, 1)) 93 | ``` 94 | 95 | # References 96 | 97 | * [Reactive Streams](http://www.reactive-streams.org/) 98 | * [R2DBC Website](http://r2dbc.io/) 99 | * [R2DBC GitHub Organization](https://github.com/r2dbc) 100 | * ["Reactive Relational Database Connectivity" at SpringOne Platform 2018](https://www.youtube.com/watch?v=idApf9DMdfk) 101 | * [Project Reactor](https://projectreactor.io/) 102 | * [Reactor Flux javadoc](https://projectreactor.io/docs/core/release/api/reactor/core/publisher/Flux.html) 103 | * [Monix Website](https://monix.io/) 104 | * [Monix Reactive - Observable](https://monix.io/docs/3x/reactive/observable.html) 105 | * [Monix Eval - Task](https://monix.io/docs/3x/eval/task.html) 106 | * [Monix Reactive](https://monix.io/docs/3x/#monix-reactive) 107 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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