4、models

BookModel

package org.app
package models

// 图书类
// id, 书名，作者，available:是否可外借
case class BookModel(id: Int, name: String, author: String, var available:Boolean){
  override def toString: String = {
    val availableStr = if(available) "可外借" else "已借出"
    s"编号：$id \t $name  \t $author, $availableStr"
  }
}

BorrowRecordModel

package org.app
package models

// 借阅记录类
case class BorrowRecordModel(
                              userName: String, // 借书人
                              bookID:Int, // 书ID
                              bookName: String, // 书名
                              borrowDate: String, // 借书日期
                              returnDate: Option[String] = None // 归还日期
                            )

UserModel

package org.app
package models

case class UserModel(
                      username:String,
                      password:String,
                      role: String // 普通用户，管理员
                    ) {

}