Slick：Return 已插入具有自动递增 ID 的行

Question

我正在尝试插入 MySQL table 和 return 具有自动递增 ID 的行。我的代码如下：

private val Log = TableQuery[GCMLogTable]

def save(log: GCMLog): Try[GCMLog] = Try {
    val newId = (Log returning Log.map(_.id)) += log
    log.copy(id = newId)
}

但是我的代码编译失败并出现以下错误：

type mismatch;
    found   : slick.profile.FixedSqlAction[Long,slick.dbio.NoStream,slick.dbio.Effect.Write]
    required: Long

也试过

def save(log: GCMLog): Try[GCMLog] = Try {
    (Log returning Log.map(_.id)
      into ((log, newId) => log.copy(id = newId))
      ) += log
}

但仍然失败

type mismatch;
found   : slick.profile.FixedSqlAction[models.GCMLog,slick.dbio.NoStream,slick.dbio.Effect.Write]
required: models.GCMLog

[我提到了 SO 问题 How to catch slick postgres exceptions for duplicate key value violations and Slick documentation here http://slick.typesafe.com/doc/3.1.1/queries.html]

如果有人能告诉我这是怎么回事以及如何解决这个问题，我将不胜感激。

谢谢！

Answer 1

 def save(log: GCMLog): Try[GCMLog] = Try {
    (Log returning Log.map(_.id))
       into ((log, newId) => log.copy(id = newId))
        ) += log
  }

更新：

看起来 db.run 需要执行以将 Action 转换为结果。

Answer 2

slick 支持它：

def create(objectToCreate: MyCaseClass): MyCaseClass = {
    db.withSession {
      (self returning self) += objectToCreate
    }
  }

Answer 3

试试这个

private val Log = TableQuery[GCMLogTable]
private val db = Database.forConfig("mysql")

def save(log: GCMLog): Try[GCMLog] = Try {
    val newId = db.run((Log returning Log.map(_.id) into ((Log,id) => Log.copy(id=id))) += log)
    Await.result(newId, Duration.Inf)
}

Slick：Return 已插入具有自动递增 ID 的行

Slick: Return inserted row with auto increment id

mysql

scala

playframework

slick