在 scala play 2.5 framework 中，要將資料儲存在 DB 中有好幾種方式，都是以整合第三方套件的方式實作，我們測試了原始的 JDBC 以及 slick 兩種，以下是 slick 的部分。
slick 是 functional relational mapping database library，是以 functional programming 方式存取關聯式資料庫。
準備 slick project
首先以 activator 產生一個新的 project，我們是使用Play Framework 2.5 and Slick 3.1。
activator new tst6 play-slick3-example
這個 template 原本是使用 H2 memory database，改用 mysql。
build.sbt
name := """play-slick-example"""
version := "1.0"
lazy val root = (project in file(".")).enablePlugins(PlayScala)
scalaVersion := "2.11.7"
routesGenerator := InjectedRoutesGenerator
resolvers += "scalaz-bintray" at "https://dl.bintray.com/scalaz/releases"
libraryDependencies ++= Seq(
cache,
ws,
filters,
"com.typesafe.play" %% "play-slick" % "2.0.0",
"com.typesafe.play" %% "play-slick-evolutions" % "2.0.0",
//"com.h2database" % "h2" % "1.4.187",
"mysql" % "mysql-connector-java" % "5.1.36",
"org.scalatestplus.play" %% "scalatestplus-play" % "1.5.0" % "test",
specs2 % Test
)
resolvers += "Sonatype snapshots" at "http://oss.sonatype.org/content/repositories/snapshots/"
fork in run := true
修改 logback.xml，主要是增加以下這一行的設定。
<logger name="slick.jdbc.JdbcBackend.statement" level="DEBUG" />
完整的 loback.xml 內容如下
<!-- https://www.playframework.com/documentation/latest/SettingsLogger -->
<configuration>
<conversionRule conversionWord="coloredLevel" converterClass="play.api.libs.logback.ColoredLevel" />
<!--
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
<file>${application.home:-.}/logs/application.log</file>
<encoder>
<pattern>%date [%level] from %logger in %thread\n\t%message%n%xException</pattern>
</encoder>
</appender>
-->
<appender name="FILE"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<append>true</append>
<rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<param name="FileNamePattern"
value="${application.home:-.}/logs/application.%d{yyyy-MM-dd}.log.zip">
</param>
</rollingPolicy>
<encoder>
<!-- <pattern>%d %-5p %c %L%n %m%n</pattern> -->
<!-- <charset class="java.nio.charset.Charset">UTF-8</charset> -->
<pattern>%date [%level] from %logger in %thread\n\t%message%n%xException</pattern>
</encoder>
</appender>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%coloredLevel %logger{15} in %thread\n\t%message%n%xException{10}</pattern>
</encoder>
</appender>
<appender name="ASYNCFILE" class="ch.qos.logback.classic.AsyncAppender">
<appender-ref ref="FILE" />
</appender>
<appender name="ASYNCSTDOUT" class="ch.qos.logback.classic.AsyncAppender">
<appender-ref ref="STDOUT" />
</appender>
<logger name="play" level="INFO" />
<logger name="application" level="DEBUG" />
<!-- Will log all statements -->
<logger name="slick.jdbc.JdbcBackend.statement" level="DEBUG" />
<!-- Off these ones as they are annoying, and anyway we manage configuration ourselves -->
<logger name="com.avaje.ebean.config.PropertyMapLoader" level="OFF" />
<logger name="com.avaje.ebeaninternal.server.core.XmlConfigLoader" level="OFF" />
<logger name="com.avaje.ebeaninternal.server.lib.BackgroundThread" level="OFF" />
<logger name="com.gargoylesoftware.htmlunit.javascript" level="OFF" />
<root level="INFO">
<appender-ref ref="ASYNCFILE" />
<appender-ref ref="ASYNCSTDOUT" />
</root>
</configuration>
project 設定
修改 application.conf，slick 並不是使用 JDBC 的 DB connection，要另外設定 slick.dbs
#slick.dbs.default.driver="slick.driver.H2Driver$"
#slick.dbs.default.db.driver=org.h2.Driver
#slick.dbs.default.db.url="jdbc:h2:mem:play;DB_CLOSE_DELAY=-1"
//slick.dbs.default.db.user=user
//slick.dbs.default.db.password=""
slick.dbs.default.driver="slick.driver.MySQLDriver$"
slick.dbs.default.db.driver=com.mysql.jdbc.Driver
slick.dbs.default.db.url="jdbc:mysql://localhost:3306/playdb?useUnicode=true&characterEncoding=utf-8"
slick.dbs.default.db.user="root"
slick.dbs.default.db.password="max168kit"
# HikariCP connection pool the min size is numThreads, and the max size is numThreads * 5
slick.dbs.default.db.numThreads=5
slick.dbs.default.db.queueSize=30
slick.dbs.default.db.connectionTimeout=15s
slick.dbs.default.db.connectionTestQuery="select 1"
ref: connection pool
DB evolution
slick 的 db evolution 跟 JDBC 的部分一樣。
application.conf
play.evolutions {
# You can disable evolutions for a specific datasource if necessary
db.default.enabled = true
autoApply = true
autoApplyDowns = true
}
conf/evolutons.default/1.sql
# DC schema
# --- !Ups
CREATE TABLE PROJECT (
ID integer NOT NULL AUTO_INCREMENT PRIMARY KEY,
NAME varchar(255) NOT NULL
);
CREATE TABLE TASK (
ID integer NOT NULL AUTO_INCREMENT PRIMARY KEY,
COLOR varchar(255) NOT NULL,
STATUS varchar(255) NOT NULL,
PROJECT integer NOT NULL,
FOREIGN KEY (PROJECT) REFERENCES PROJECT (ID)
);
# --- !Downs
DROP TABLE TASK;
DROP TABLE PROJECT;
scala codes
這個部分的 code 都是由 play-slick3-example 這個 template 來的，並沒有做什麼修改，主要可以發現，Application 都是使用 Action.async 搭配 Future 的方式，進行非同步的處理。
conf/routes URI 的設定用到了 PUT, PATCH 比較少見的 HTTP Method，我們在測試時，可以用 Chrome Postman 進行測試。
GET / controllers.Application.listProjects
PUT /projects/:name controllers.Application.createProject(name: String)
GET /projects/list controllers.Application.listProjects
GET /projects/:id controllers.Application.projects(id: Long)
PUT /projects/:id/:name controllers.Application.addTaskToProject(name: String, id: Long)
PATCH /tasks/:id controllers.Application.modifyTask(id: Long, color:Option[String] ?= None)
DELETE /projects/:name controllers.Application.delete(name: String)
- app/controllers/Application.scala
package controllers
import java.util.concurrent.{TimeoutException, TimeUnit}
import javax.inject.Inject
import akka.actor.ActorSystem
import models.{Project, ProjectRepo, TaskRepo}
import play.api.Logger
import play.api.libs.concurrent.Execution.Implicits.defaultContext
import play.api.mvc.{Action, Controller}
import akka.pattern.after
import scala.concurrent.duration._
import scala.concurrent.Future
class Application @Inject()( projectRepo: ProjectRepo, taskRepo: TaskRepo, actorSystem: ActorSystem)
extends Controller {
def addTaskToProject(color: String, projectId: Long) = Action.async { implicit rs =>
projectRepo.addTask(color, projectId)
.map{ _ => Redirect(routes.Application.projects(projectId)) }
}
def modifyTask(taskId: Long, color: Option[String]) = Action.async { implicit rs =>
taskRepo.partialUpdate(taskId, color, None, None).map(i =>
Ok(s"Rows affected : $i"))
}
def createProject(name: String)= Action.async { implicit rs =>
projectRepo.create(name)
.map(id => Ok(s"project $id created") )
}
def listProjects = Action.async { implicit rs =>
projectRepo.all
.map(projects => Ok(views.html.projects(projects)))
}
def projects(id: Long) = Action.async { implicit rs =>
for {
Some(project) <- projectRepo.findById(id)
tasks <- taskRepo.findByProjectId(id)
} yield Ok(views.html.project(project, tasks))
}
def delete(name: String) = Action.async { implicit rs =>
projectRepo.delete(name).map(num => Ok(s"$num projects deleted"))
}
}
ProjectsTable 的部分是在定義 Projects
package models
import javax.inject.Inject
import play.api.Logger
import play.api.db.slick.DatabaseConfigProvider
import slick.dbio
import slick.dbio.Effect.Read
import slick.driver.JdbcProfile
import slick.jdbc.GetResult
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future
case class Project(id: Long, name: String)
class ProjectRepo @Inject()(taskRepo: TaskRepo)(protected val dbConfigProvider: DatabaseConfigProvider) {
val dbConfig = dbConfigProvider.get[JdbcProfile]
val db = dbConfig.db
import dbConfig.driver.api._
private val Projects = TableQuery[ProjectsTable]
private def _findById(id: Long): DBIO[Option[Project]] =
Projects.filter(_.id === id).result.headOption
private def _findByName(name: String): Query[ProjectsTable, Project, List] =
Projects.filter(_.name === name).to[List]
def findById(id: Long): Future[Option[Project]] =
db.run(_findById(id))
def findByName(name: String): Future[List[Project]] =
db.run(_findByName(name).result)
def all: Future[List[Project]] =
db.run(Projects.to[List].result)
def create(name: String): Future[Long] = {
val project = Project(0, name)
db.run(Projects returning Projects.map(_.id) += project)
}
def delete(name: String): Future[Int] = {
val query = _findByName(name)
val interaction = for {
projects <- query.result
_ <- DBIO.sequence(projects.map(p => taskRepo._deleteAllInProject(p.id)))
projectsDeleted <- query.delete
} yield projectsDeleted
db.run(interaction.transactionally)
}
def addTask(color: String, projectId: Long): Future[Long] = {
val interaction = for {
Some(project) <- _findById(projectId)
id <- taskRepo.insert(Task(0, color, TaskStatus.ready, project.id))
} yield id
db.run(interaction.transactionally)
}
// 定義 Project 這個 table
private class ProjectsTable(tag: Tag) extends Table[Project](tag, "PROJECT") {
// primary key 為 ID
def id = column[Long]("ID", O.AutoInc, O.PrimaryKey)
def name = column[String]("NAME")
def * = (id, name) <> (Project.tupled, Project.unapply)
def ? = (id.?, name.?).shaped.<>({ r => import r._; _1.map(_ => Project.tupled((_1.get, _2.get))) }, (_: Any) => throw new Exception("Inserting into ? projection not supported."))
}
}
比較特別的地方，是 TaskStatus，還有 taskStatusColumnType 做自動轉換，這裡對應到一個 DB 欄位，有 ready/set/go 這三種數值，所以用 Enumeration 定義該欄位。
package models
import javax.inject.Inject
import play.api.db.slick.DatabaseConfigProvider
import slick.driver.JdbcProfile
import scala.concurrent.Future
case class Task(id: Long, color: String, status: TaskStatus.Value, project: Long) {
def patch(color: Option[String], status: Option[TaskStatus.Value], project: Option[Long]): Task =
this.copy(color = color.getOrElse(this.color),
status = status.getOrElse(this.status),
project = project.getOrElse(this.project))
}
object TaskStatus extends Enumeration {
val ready = Value("ready")
val set = Value("set")
val go = Value("go")
}
class TaskRepo @Inject()(protected val dbConfigProvider: DatabaseConfigProvider) {
val dbConfig = dbConfigProvider.get[JdbcProfile]
val db = dbConfig.db
import dbConfig.driver.api._
private val Tasks = TableQuery[TasksTable]
def findById(id: Long): Future[Task] =
db.run(Tasks.filter(_.id === id).result.head)
def findByColor(color: String): DBIO[Option[Task]] =
Tasks.filter(_.color === color).result.headOption
def findByProjectId(projectId: Long): Future[List[Task]] =
db.run(Tasks.filter(_.project === projectId).to[List].result)
def findByReadyStatus: DBIO[List[Task]] =
Tasks.filter(_.status === TaskStatus.ready).to[List].result
def partialUpdate(id: Long, color: Option[String], status: Option[TaskStatus.Value], project: Option[Long]): Future[Int] = {
import scala.concurrent.ExecutionContext.Implicits.global
val query = Tasks.filter(_.id === id)
val update = query.result.head.flatMap {task =>
query.update(task.patch(color, status, project))
}
db.run(update)
}
def all(): DBIO[Seq[Task]] =
Tasks.result
def insert(Task: Task): DBIO[Long] =
Tasks returning Tasks.map(_.id) += Task
def _deleteAllInProject(projectId: Long): DBIO[Int] =
Tasks.filter(_.project === projectId).delete
private class TasksTable(tag: Tag) extends Table[Task](tag, "TASK") {
def id = column[Long]("ID", O.AutoInc, O.PrimaryKey)
def color = column[String]("COLOR")
def status = column[TaskStatus.Value]("STATUS")
def project = column[Long]("PROJECT")
def * = (id, color, status, project) <> (Task.tupled, Task.unapply)
def ? = (id.?, color.?, status.?, project.?).shaped.<>({ r => import r._; _1.map(_ => Task.tupled((_1.get, _2.get, _3.get, _4.get))) }, (_: Any) => throw new Exception("Inserting into ? Taskion not supported."))
}
implicit val taskStatusColumnType = MappedColumnType.base[TaskStatus.Value, String](
_.toString, string => TaskStatus.withName(string))
}
測試
Postman 是一個 Chome APP，可以進行 http 測試
Database Persistence in Scala play 2.5 using slick.zip
plain SQL in slick
如果要在 slick 裡面使用 SQL，則用別的方式進行。
ref:
slick plain sql
play-slick 版本對應
activator 中有個 sample template，但只拿來參考而已。
activator new test7 slick-plainsql-3.0
首先在 routes 的地方加上 URI
GET /pj/:id controllers.Application.getproject(id:Long)
GET /pj2/:id controllers.Application.getproject2(id:Long)
GET /pj3/:id controllers.Application.getproject3(id:Long)
GET /update/:id/:name controllers.Application.updateproject(id:Long, name:String)
Application 的 constructor 要 @Inject() actorSystem: ActorSystem，getproject 的部分是在測試 Future 的寫法，這個部分故意留下錯誤的寫法，因為 Future 區塊裡面的 callback codes，是使用不同的 thread 執行的。
getproject3 加上了非同步的 timeout 檢查，如果 2 seconds 後沒有完成，就會產生 Excetpion。
package controllers
import java.util.concurrent.{TimeoutException, TimeUnit}
import javax.inject.Inject
import akka.actor.ActorSystem
import models.{Project, ProjectRepo, TaskRepo}
import play.api.Logger
import play.api.libs.concurrent.Execution.Implicits.defaultContext
import play.api.mvc.{Action, Controller}
import akka.pattern.after
import scala.concurrent.duration._
import scala.concurrent.Future
class Application @Inject()( projectRepo: ProjectRepo, taskRepo: TaskRepo, actorSystem: ActorSystem)
extends Controller {
def getproject(id:Long) = Action {
Logger.info(s"getproject id=${id}")
var result = "DB project:\n"
val pjs: Future[Seq[String]] = projectRepo.findByIdCustom2(id)
pjs.map{
// 因為是非同步，這裡是在不同 thread 執行的
cs => {
for(c<-cs) {
Logger.info("c="+c.toString)
// c=test
result += c.toString
Logger.info(s"result=$result")
}
}
}
// 這是錯誤的寫法
// 只有 DB project: 沒有 db 查詢的結果.... 錯誤 的結果
Logger.info(s"result=$result")
Ok(result)
}
def getproject2(id: Long) = Action.async {
//val futureNumRowsDeleted = scala.concurrent.Future{ Transaction.delete(id) }
val pjs: Future[Seq[String]] = projectRepo.findByIdCustom2(id)
pjs.map {
var result = "DB project:\n"
cs => {
for (c <- cs) {
Logger.info("c=" + c.toString)
// c=test
result += c.toString+" "
Logger.info(s"result=$result")
}
}
Logger.info(s"result=$result")
Ok(result)
}
}
def getproject3(id: Long) = Action.async {
//val futureNumRowsDeleted = scala.concurrent.Future{ Transaction.delete(id) }
val pjs: Future[Seq[Project]] = projectRepo.findByIdCustom3(id)
//val timeout = play.api.libs.concurrent.Promise.timeout("Past max time", 2, TimeUnit.SECONDS)
//val timeoutFuture = after(2.second, actorSystem.scheduler)(Future.successful("Oops"))
val timeoutFuture = after(2.second, actorSystem.scheduler)(Future.failed(new TimeoutException("Future timed out!")))
Future.firstCompletedOf(Seq(pjs, timeoutFuture)).map {
case cs: Seq[Project] => {
var result = "DB project:\n"
for (c <- cs) {
Logger.info("c=" + c.name)
// c=test
result += c.name + " "
Logger.info(s"result=$result")
}
Ok(result)
}
case t: TimeoutException => InternalServerError(t.getMessage)
}
}
def updateproject(id: Long, name:String) = Action.async {
val pjs: Future[Int] = projectRepo.updateproject(id, name)
val timeoutFuture = after(2.second, actorSystem.scheduler)(Future.failed(new TimeoutException("Future timed out!")))
Future.firstCompletedOf(Seq(pjs, timeoutFuture)).map {
case cs: Int => {
val result = s"DB update result:${cs}\n"
Ok(result)
}
//case t: Any => InternalServerError()
}
}
}
app/models/Project.scala
findByIdCustom3 是在測試直接轉換成 Project 物件的方法。
package models
import javax.inject.Inject
import play.api.Logger
import play.api.db.slick.DatabaseConfigProvider
import slick.dbio
import slick.dbio.Effect.Read
import slick.driver.JdbcProfile
import slick.jdbc.GetResult
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future
case class Project(id: Long, name: String)
class ProjectRepo @Inject()(taskRepo: TaskRepo)(protected val dbConfigProvider: DatabaseConfigProvider) {
val dbConfig = dbConfigProvider.get[JdbcProfile]
val db = dbConfig.db
import dbConfig.driver.api._
private val Projects = TableQuery[ProjectsTable]
/////////////
def findByIdCustom2(id:Long): Future[Seq[String]] = {
val query = sql"select NAME from PROJECT where ID=$id".as[(String)]
//db.run(query)
Logger.info("findByIdCustom2")
//db.run(query)
val f: Future[Seq[String]] = db.run(query)
//f.onSuccess { case s => println(s"Result: $s") }
f
}
implicit val getProjectResult = GetResult(r => Project(r.nextLong, r.nextString))
def findByIdCustom3(id:Long): Future[Seq[Project]] = {
// as[(Project)] 的部分會參考到 上面的 getProjectResult 的 GetResult，並自動轉換為 Project 物件
val query = sql"select ID, NAME from PROJECT where ID=$id".as[(Project)]
//db.run(query)
Logger.info("findByIdCustom3")
//db.run(query)
val f: Future[Seq[Project]] = db.run(query)
//f.onSuccess { case s => println(s"Result: $s") }
f
}
def updateproject(id:Long, name:String): Future[Int] = {
val update = sqlu"update PROJECT set name=$name where ID=$id"
//db.run(query)
Logger.info("updateproject")
//db.run(query)
val f: Future[Int] = db.run(update)
//f.onSuccess { case s => println(s"Result: $s") }
f
}
}
測試就直接用 curl 就可以了
curl -v 'http://localhost:9000/pj/1'
curl -v 'http://localhost:9000/pj2/1'
curl -v 'http://localhost:9000/pj3/1'
curl -v 'http://localhost:9000/update/1/test2'
