问题:

I'm writing a veery simple scala script to connect to Mysql using slick 3.

My build.sbt looks like this:

name := "slick_sandbox"  version := "1.0"  scalaVersion := "2.11.7"  libraryDependencies ++= Seq(   "com.typesafe.slick" %% "slick" % "3.0.3",   "org.slf4j" % "slf4j-nop" % "1.6.4",   "mysql" % "mysql-connector-java" % "5.1.6"  )

application.conf:

Drivder is an intentional mistake; also, I did not provide a db username or password!

mysqldb = {   url = "jdbc:mysql://localhost/slickdb"   driver = com.mysql.jdbc.Drivder   connectionPool = disabled   keepAliveConnection = true }

Main.scala

import slick.driver.MySQLDriver.api._ import scala.concurrent.ExecutionContext.Implicits.global

object Main {    def main(args: Array[String]) {      // test to see this function is being run; it IS     println("foobar")      // I expected an error here due to the intentional     // mistake I've inserted into application.conf     // I made sure the conf file is getting read; if I change mysqldb     // to some other string, I get correctly warned it is not a     // valid key     val db = Database.forConfig("mysqldb")      val q = sql"select u.name from users ".as[String]      db.run(q).map{ res=>       println(res)     }   } }

It compiles OK. Now this is the result I see when I run sbt run on the terminal:

felipe@felipe-XPS-8300:~/slick_sandbox$ sbt run [info] Loading project definition from /home/felipe/slick_sandbox/project [info] Set current project to slick_sandbox (in build file:/home/felipe/slick_sandbox/) [info] Compiling 1 Scala source to /home/felipe/slick_sandbox/target/scala-2.11/classes... [info] Running Main  foobar [success] Total time: 5 s, completed Sep 17, 2015 3:29:39 AM

Everything looks deceptively OK; even though I explicitly ran the query on a database that doesn't exist, slick went ahead as if nothing has happened.

What am I missing here?

回答1:

Slick runs queries asynchronously. So it just didn't have enough time to execute it. In your case you have to wait for result.

object Main {    def main(args: Array[String]) {      println("foobar")      val db = Database.forConfig("mysqldb")      val q = sql"select u.name from users ".as[String]      Await.result(       db.run(q).map{ res=>       println(res)     }, Duration.Inf)   } }

转载请标明出处:Connecting to Mysql using Slick 3.0 - No username, no password and bogus driver does not equal error

文章来源: Connecting to Mysql using Slick 3.0 - No username, no password and bogus driver does not equal error

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