Question

我尝试根据示例添加列[slick-pg示例] [1]

还添加到类表含义

 implicit val pointFormat = MyFormats.geometryFormat[Point]

但有编译错误

could not find implicit value for parameter tt: slick.ast.TypedType[com.vividsolutions.jts.geom.Point]

我做错了什么？你能举个例子吗？ ^

BR！

Answer 1

在this指令之后编写与PostgresDriver的集成时，在覆盖with PostGISImplicits的对象中添加api（此特征未包含在示例中）。

Answer 2

我为我工作的是以下设置：

首先，我的表声明：

 class EventTable(tag: Tag) extends Table[Event](tag, "event"){
   def uid = column[String]("uid", O.PrimaryKey, O.Length(36))
   def userUid = column[String]("user_uid")
   def location = column[Point]("location")
   def start = column[LocalDateTime]("start")
   def end = column[LocalDateTime]("end")
   def visible = column[Boolean]("visible")
   def attending = column[Int]("attending")
   def required = column[Int]("required")
   def createdAt = column[LocalDateTime]("created_at")

   def * = (uid, userUid, location, start, end, visible, attending, required, createdAt) <>
      (Event.tupled, Event.unapply)
 }

我需要扩展：java8时间支持（LocalDateTime）和geo stuff（Point）。这反映在我的build.sbt - 我使用版本0.11.0 for slick-pg：

"com.github.tminglei" %% "slick-pg"                             % slickPgV,
"com.github.tminglei" %% "slick-pg_jts"                         % slickPgV,
"com.github.tminglei" %% "slick-pg_date2"                       % slickPgV,

现在，驱动程序声明：

import com.github.tminglei.slickpg._

trait ExtendedPostgresDriver extends ExPostgresDriver
  with PgArraySupport
  with PgDate2Support
  with PgRangeSupport
  with PgHStoreSupport
  with PgSearchSupport
  with PgPostGISSupport
  with PgNetSupport
  with PgLTreeSupport {

   override val api = MyAPI

   object MyAPI extends API with ArrayImplicits
                            with DateTimeImplicits
                            with PostGISImplicits
                            with NetImplicits
                            with LTreeImplicits
                            with RangeImplicits
                            with HStoreImplicits
                            with SearchImplicits
                            with SearchAssistants {
   implicit val strListTypeMapper = new SimpleArrayJdbcType[String]("text").to(_.toList)

  }
}

object ExtendedPostgresDriver extends ExtendedPostgresDriver

所以，拿java 8时间的东西。您可以注意到驱动程序使用PgDate2Support，然后允许我使用隐式DateTimeImplicits。通过在我感兴趣的类中导入ExtendedPostgresDriver.api._，我可以让表定义使用我需要的LocalDateTime类型。

Point同样如此：PgPostGISSupport - ＆gt; PostGISImplicits - ＆gt; Point。

希望这有帮助

scala + slick-pg +隐式

2 个答案: