ScalikeJDBC-Async

ScalikeJDBC Extension: Non-blocking APIs in the JDBC way

ScalikeJDBC-Async provides non-blocking APIs to talk with PostgreSQL and MySQL in the JDBC way.

This library is built with postgrsql-async and mysql-async,incredible works by @mauricio.

ScalikeJDBC:

https://github.com/scalikejdbc/scalikejdbc

ScalikeJDBC is a tidy SQL-based DB access library for Scala developers. This library naturally wraps JDBC APIs and provides you easy-to-use APIs.

Important Notice

ScalikeJDBC-Async is still in the beta stage. If you don't have motivation to investigate or fix issues by yourself, we recommend you waiting until stable version release someday.

Supported RDBMS

• PostgreSQL
• MySQL

Dependencies

Add scalikejdbc-async to your dependencies.

libraryDependencies ++= Seq(
  "org.scalikejdbc"     %% "scalikejdbc-async" % "0.6.+",
  "com.github.mauricio" %% "postgresql-async"  % "0.2.+",
  "com.github.mauricio" %% "mysql-async"       % "0.2.+",
  "org.slf4j"           %  "slf4j-simple"      % "1.7.+" // slf4j implementation
)

If you're a Play2 user, use play-plugin too!

val appDependencies = Seq(
  "org.scalikejdbc"     %% "scalikejdbc-async"             % "0.6.+",
  "org.scalikejdbc"     %% "scalikejdbc-async-play-plugin" % "0.6.+",
  "com.github.mauricio" %% "postgresql-async"              % "0.2.+"
)

Example

• programmerlist/ExampleSpec.scala
• programmerlist/Company.scala
• programmerlist/Programmer.scala

import scalikejdbc._, async._
import scala.concurrent._, duration._, ExecutionContext.Implicits.global

// set up connection pool (that's all you need to do)
AsyncConnectionPool.singleton("jdbc:postgresql://localhost:5432/scalikejdbc", "sa", "sa")

// create a new record within a transaction
val created: Future[Company] = AsyncDB.localTx { implicit tx =>
  for {
    company <- Company.create("ScalikeJDBC, Inc.", Some("http://scalikejdbc.org/"))
    seratch <- Programmer.create("seratch", Some(company.id))
    gakuzzzz <- Programmer.create("gakuzzzz", Some(company.id))
    xuwei_k <- Programmer.create("xuwei-k", Some(company.id))
  } yield company
}

Await.result(created, 5.seconds)

created.foreach { newCompany: Company =>

  // delete a record and rollback
  val withinTx: Future[Unit] = AsyncDB.localTx { implicit tx =>
    for {
      restructuring <- Programmer.findAllBy(sqls.eq(p.companyId, newCompany.id)).map { 
        programmers => programmers.foreach(_.destroy()) 
      }
      dissolution <- newCompany.destroy()
      failure <- sql"Just joking!".update.future
    } yield ()
  }

  try Await.result(withinTx, 5.seconds)
  catch { case e: Exception => log.debug(e.getMessage, e) }

  // rollback expected
  val company = AsyncDB.withPool { implicit s =>
    Company.find(newCompany.id)
  }
  Await.result(company, 5.seconds)
  val found: Option[Company]= company.value.get.get
  found.isDefined should be(true)
}

Transactional queries should be executed in series. You cannot use Future.traverse or Future.sequence.

Play2 Example

See the play-sample project:

https://github.com/scalikejdbc/scalikejdbc-async/blob/master/play-sample

FAQ

Is it production-ready?

ScalikeJDBC-Async and postgrsql-async and mysql-async basically works fine. However, to be honest, ScalikeJBDC-Async doesn't have much of a record of production applications.

Is it possible to combine scalikejdbc-async with normal scalikejdbc?

Yes, it's possible. See this example.

Why isn't it a part of scalikejdbc project now?

This library is still in alpha stage. If this library becomes stable enough, it will be merged into the ScalikeJDBC project.

How to contribute?

Before sending pull requests, please prepare the following DB settings and write tests to ensure that your fixes work as expected.

• PostgreSQL

url: jdbc:postgresql://localhost:5432/scalikejdbc
username: sa
password: sa

url: jdbc:postgresql://localhost:5432/scalikejdbc2
username: sa
password: sa

• MySQL

url: jdbc:mysql://localhost:3306/scalikejdbc
username: sa
password: sa

License

Published binary files have the following copyright:

Copyright 2013 - 2014 scalikejdbc.org

Apache License, Version 2.0

http://www.apache.org/licenses/LICENSE-2.0.html