显示方法的参数过多

Question

我试图在 apple_reportDB 中插入一些数据，但我得到的错误是 Too many arguments for method in the insert query

import scala.slick.driver.MysqlDriver.simple._

case class AppleReport(quantity:String,price:String,sale_amount:String)  

//tables
class Suppliers(tag: Tag)
  extends Table[AppleReport](tag, "apple_report") {

def quantity=column[String]("quantity")
def price=column[String]("price")
def sale_amount=column[String]("sale_amount")

def * =(quantity,price,sale_amount) <> (AffiliateReportFields.tupled,AffiliateReportFields.unapply)
}

   //declaring interface
val suppliers: TableQuery[Suppliers] = TableQuery[Suppliers]

val db=Database.forURL("jdbc:mysql://localhost:3306/apple_reportDB","root","",null, driver="com.mysql.jdbc.Driver")
  db.withSession { implicit session =>

//create table
suppliers.ddl.create
//Insert data
suppliers += ("apple","cow","cat")

  }

Answer 1

您的 Suppliers table 扩展 Table[AppleReport]。因此，您的插入语句需要一个 case class AppleReport 的对象。

但是您使用 3 个字符串 ("apple","cow","cat") 调用该方法，因此出现错误。将其更改为 AppleReport("apple","cow","cat")，您的代码将起作用

显示方法的参数过多

Shows too many arguments for method

scala

slick-2.0