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package daoimport scala.collection.mutable.ListBuffer
import scala.io.Sourceclass BorrowRecordDAO {def loadBorrowRecords(): ListBuffer[BorrowRecordModel] = {val borrowRecords = ListBuffer[BorrowRecordModel]()val lines = Source.fromFile("borrow_records.txt")for(line <- lines.getLines()){val Array(userName,bookID,bookName,borrowDate,returnDate) = line.split(",")borrowRecords += BorrowRecordModel(userName,bookID.toInt,bookName,borrowDate,Some(returnDate))}borrowRecords
}// 写入借阅记录def saveBorrowRecords(records: ListBuffer[BorrowRecordModel]): Unit = {val writer = new java.io.PrintWriter("borrow_records.txt")for(record <- records){writer.println(record.userName+","+record.bookID+","+record.bookName+","+record.borrowDate+","+record.returnDate.getOrElse(""))}writer.close()}}