I'm trying to get a hang of Slick by doing a small test. I'm trying to do an insert. The test runs, no errors, but when I check the db, no record has been inserted.
What am I doing wrong?
Here's my test code:
Note: I disabled the first 'flatMap' because when I wanted to test the second insert method, and that code was not executed when the first flatmap function was enabled.
Both insert methods do not insert a new record. The first query for all items does work. The 'Test id:xx' lines are printed to console.
object TestSlick extends App {
import slick.driver.PostgresDriver.api._
import concurrent.ExecutionContext.Implicits.global
import concurrent.duration._
val config = ConfigFactory.load()
val username = config.getString("app.database.jdbc.username")
val password = config.getString("app.database.jdbc.password")
val url: String = config.getString("app.database.jdbc.url")
val db = Database.forURL(url, username, password)
try {
import Tables._
val res = db.run(headlines.result).map(_.foreach {
case HeadLineRow(id, _, _, _, _, companyId, text, from, days, end, user) =>
println(s"Test id:$id")
}).flatMap { _ =>
// println("Inserting....")
// val ts = Timestamp.valueOf(LocalDateTime.now())
// val insertAction: DBIO[Option[Int]] = (headlines returning headlines.map(_.id)) +=
// HeadLineRow(None, 100, 100, "tekst", ts, 5, ts, None, None, None, None)
//
// db.run(insertAction.transactionally.map(
// newId => println(s"New id: $newId"))
// )
// }.flatMap { _ =>
println("Inserting....(2)")
val ts = Timestamp.valueOf(LocalDateTime.now())
val insertAction = headlines.map(p => p) += HeadLineRow(None, 1921, 65, "tekst2", ts, 5, ts, None, None, None, None)
db.run(insertAction.transactionally.map(
r => println(s"Insert result: ${r}"))
)
}
Await.ready(res, 30 seconds);
} finally db.close()
}
And my table (generated using Slick's generator and then adjusted a bit (auto-inc id, swapped some properties around))
package com.wanneerwerkik.db.slick
// AUTO-GENERATED Slick data model
/** Stand-alone Slick data model for immediate use */
object Tables extends {
val profile = slick.driver.PostgresDriver
} with Tables
/** Slick data model trait for extension, choice of backend or usage in the cake pattern. (Make sure to initialize this late.) */
trait Tables {
val profile: slick.driver.JdbcProfile
import profile.api._
import slick.model.ForeignKeyAction
import slick.collection.heterogeneous._
import slick.collection.heterogeneous.syntax._
// NOTE: GetResult mappers for plain SQL are only generated for tables where Slick knows how to map the types of all columns.
import slick.jdbc.{GetResult => GR}
/** DDL for all tables. Call .create to execute. */
lazy val schema = Array(headlines.schema).reduceLeft(_ ++ _)
@deprecated("Use .schema instead of .ddl", "3.0")
def ddl = schema
/**
* Entity class storing rows of table 'head_line_bar'
* @param id Database column id SqlType(int4), PrimaryKey
* @param createdBy Database column created_by SqlType(int4), Default(None)
* @param createdOn Database column created_on SqlType(timestamp), Default(None)
* @param updatedBy Database column updated_by SqlType(int4), Default(None)
* @param updatedOn Database column updated_on SqlType(timestamp), Default(None)
* @param companyId Database column company_id SqlType(int4), Default(None)
* @param contentType Database column content_type SqlType(varchar), Length(255,true), Default(None)
* @param fromDate Database column from_date SqlType(timestamp), Default(None)
* @param numberofdays Database column numberofdays SqlType(int4), Default(None)
* @param uptoEndDate Database column upto_end_date SqlType(timestamp), Default(None)
* @param userId Database column user_id SqlType(int4), Default(None)
*/
case class HeadLineRow(
id: Option[Int],
userId: Int,
companyId: Int,
contentType: String,
fromDate: java.sql.Timestamp,
numberofdays: Int,
uptoEndDate: java.sql.Timestamp,
createdBy: Option[Int] = None,
createdOn: Option[java.sql.Timestamp] = None,
updatedBy: Option[Int] = None,
updatedOn: Option[java.sql.Timestamp] = None
)
/** GetResult implicit for fetching HeadLineBarRow objects using plain SQL queries */
implicit def GetResultHeadLineRow(implicit e0: GR[Int], e1: GR[Option[Int]], e2: GR[Option[java.sql.Timestamp]], e3: GR[Option[String]]): GR[HeadLineRow] = GR{
prs => import prs._
HeadLineRow.tupled((<<?[Int], <<[Int], <<[Int], <<[String], <<[java.sql.Timestamp], <<[Int], <<[java.sql.Timestamp], <<?[Int], <<?[java.sql.Timestamp], <<?[Int], <<?[java.sql.Timestamp]))
}
/**
* Table description of table head_line_bar.
* Objects of this class serve as prototypes for rows in queries.
*/
class Headlines(_tableTag: Tag) extends Table[HeadLineRow](_tableTag, "head_line_bar") {
def * = (id, userId, companyId, contentType, fromDate, numberofdays, uptoEndDate, createdBy, createdOn, updatedBy, updatedOn) <> (HeadLineRow.tupled, HeadLineRow.unapply)
/** Maps whole row to an option. Useful for outer joins. */
def ? = (Rep.Some(id), userId, companyId, contentType, fromDate, numberofdays, uptoEndDate, createdBy, createdOn, updatedBy, updatedOn).shaped.<>({r=>import r._; _1.map(_=> HeadLineRow.tupled((_1.get, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11)))}, (_:Any) => throw new Exception("Inserting into ? projection not supported."))
/** Database column id SqlType(int4), PrimaryKey */
val id: Rep[Option[Int]] = column[Option[Int]]("id", O.PrimaryKey, O.AutoInc)
/** Database column user_id SqlType(int4), Default(None) */
val userId: Rep[Int] = column[Int]("user_id")
/** Database column company_id SqlType(int4), Default(None) */
val companyId: Rep[Int] = column[Int]("company_id")
/** Database column content_type SqlType(varchar), Length(255,true), Default(None) */
val contentType: Rep[String] = column[String]("content_type", O.Length(255,varying=true))
/** Database column from_date SqlType(timestamp), Default(None) */
val fromDate: Rep[java.sql.Timestamp] = column[java.sql.Timestamp]("from_date")
/** Database column numberofdays SqlType(int4), Default(None) */
val numberofdays: Rep[Int] = column[Int]("numberofdays")
/** Database column upto_end_date SqlType(timestamp), Default(None) */
val uptoEndDate: Rep[java.sql.Timestamp] = column[java.sql.Timestamp]("upto_end_date")
/** Database column created_by SqlType(int4), Default(None) */
val createdBy: Rep[Option[Int]] = column[Option[Int]]("created_by", O.Default(None))
/** Database column created_on SqlType(timestamp), Default(None) */
val createdOn: Rep[Option[java.sql.Timestamp]] = column[Option[java.sql.Timestamp]]("created_on", O.Default(None))
/** Database column updated_by SqlType(int4), Default(None) */
val updatedBy: Rep[Option[Int]] = column[Option[Int]]("updated_by", O.Default(None))
/** Database column updated_on SqlType(timestamp), Default(None) */
val updatedOn: Rep[Option[java.sql.Timestamp]] = column[Option[java.sql.Timestamp]]("updated_on", O.Default(None))
}
/** Collection-like TableQuery object for table HeadLineBar */
lazy val headlines = new TableQuery(tag => new Headlines(tag))
}
Log output is too big to paste here so I put it in this gist.
As suggested I added a readLine to wait for the result, but it was already output the same stuff. I also added a completion handler on the Future to print it's Success or Failure. Apparently it fails with a RejectedExecutionException. Why?
Failure: java.util.concurrent.RejectedExecutionException: Task slick.backend.DatabaseComponent$DatabaseDef$$anon$2@2e4db0df rejected from java.util.concurrent.ThreadPoolExecutor@43760a50[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 1]
答案 0 :(得分：0)
这只是猜测，但也许你的测试框架在某种程度上被flatMap内部产生新任务，再次需要执行上下文这一事实所困惑（参见例如this thread - 它＆＃39;关于Scala 2.10，但我认为这没有改变）。因此，在插入执行之前释放资源。
您是否尝试过将println放入finally块中，看看是否在插入消息之前或之后调用了它？
您是否尝试使用等待同步运行两个期货？在这种情况下，你可能不会遇到这个问题。
您可以考虑使用完全异步支持进行测试，请参阅例如this link