在Scala中將java.io.File轉換為java.sql.Blob

Question

我正在嘗試將java.io.File轉換為java.sql.Blob。 更具體地說，我在Scala Play中擁有一個模型，該模型需要將文件存儲在數據庫中，這就是我到目前為止所擁有的。

    case class Complication(complicationId: Long,
    vitalSignId: Long,
    complication: String, definition: String, reason: String,
    treatment: String, treatmentImage: Option[java.io.File], notes: String,
    weblinks: String, upperlower: String)

  object ComplicationDAO extends Table[Complication]("complications") with GasGuruDatabase {

    def complicationId = column[Long]("complication_id", O.PrimaryKey, O.AutoInc)
    def vitalSignId = column[Long]("vital_sign_id")
    def complication = column[String]("complication")
    def definition = column[String]("definition", O.DBType("varchar(4000)"))
    def reason = column[String]("reason", O.DBType("varchar(4000)"))
    def treatment = column[String]("treatment", O.DBType("varchar(4000)"))
    def treatmentImage = column[Option[Blob]]("treatment_image")
    def notes = column[String]("notes", O.DBType("varchar(4000)"))
    def weblinks = column[String]("weblinks")
    def upperlower = column[String]("upperlower")
    def * = complicationId ~ vitalSignId ~ complication ~ definition ~ reason ~ treatment ~ treatmentImage ~ notes ~ weblinks ~ upperlower <> (Complication, Complication.unapply _)

從java.io.File到Blob的映射（將文件存儲在數據庫內部）之間發生錯誤，我該怎么做？

謝謝！

Answer 1

在嘗試存儲文件之前，必須將文件實際讀入與blob兼容的文件中，java.io.File只是一個描述符

來自Slick的文檔LOB類型：java.sql.Blob，java.sql.Clob，Array [Byte]

case class Complication(complicationId: Long,
vitalSignId: Long,
complication: String, definition: String, reason: String,
treatment: String, treatmentImage: **Option[Array[Byte]]**, notes: String,
weblinks: String, upperlower: String)