使用grails导入文件CSV时获取下一行

Question

我正在尝试导入文件CSV，如此图片..

此图片表示..

当我导入此文件时，将行1读取并保存到Table SeniorHighSchool 那么它会得到：

1. 姓名：Alexander
2. 年龄：15
3. muchcourse：3

之后我想要做一个条件，当＆＃34;多道次被填满＆＃34;它会读下一行...... 例如： 在这种情况下，＆＃34; muchcourse＆＃34;是＆＃34; 3＆＃34;，然后＆＃34;看图像＆＃34; ..行2,3,4（3行）将被插入到其他表格中...因为＆＃34; muchcourse＆＃34 ;是＆＃34; 3＆＃34;



这是我编写的，我尝试过的。

def upload = {
            withForm{
                def f = request.getFile('filecsv')
                def orifilename = f.getOriginalFilename()
                def homeDir = new File(System.getProperty("user.home")) 
                def homeurl = "Documents/Uploads/"
                File fileDest = new File(homeDir,homeurl+orifilename)
                f.transferTo(fileDest)  

                request.getFile(new File(fileDest)).InputStream.splitEachLine(',') {fields ->
                def student= new SeniorHighSchool(
                    name: fields[0].trim(),
                    age: fields[1].trim(),
                    muchcourse: fields[2].trim()

                    )
                if (student.hasErrors() || student.save(flush: true) == null)
                {
                    log.error("Could not import domainObject  ${student.errors}")
                }
                }

                redirect(action:"list")

            }
                }

我很困惑，以制造一个条件..

  def upload = {
                    withForm{
                        def f = request.getFile('filecsv')
                        def orifilename = f.getOriginalFilename()
                        def homeDir = new File(System.getProperty("user.home")) 
                        def homeurl = "Documents/Uploads/"
                        File fileDest = new File(homeDir,homeurl+orifilename)
                        f.transferTo(fileDest)  

                        request.getFile(new File(fileDest)).InputStream.splitEachLine(',') {fields ->
                        def student= new SeniorHighSchool(
                            name: fields[0].trim(),
                            age: fields[1].trim(),
                            muchcourse: fields[2].trim()

                            )
                        if (student.hasErrors() || student.save(flush: true) == null)
                        {
                            log.error("Could not import domainObject  ${student.errors}")
                        }

                       if(fields[2]) {
                       def score = new Score(
                       course: //the problem at this line..how?
                               //it will insert 3 times then back to the row 5 to insert into "Student" again
                        )



    }
                        }

                        redirect(action:"list")

                    }


 }

Answer 1

if(fields.size()>2){
  store 3 values in one table(student)
}
else{
  store 2 values in another table(score)
}

如果出现多道场，则字段大小为3，然后在一个表中保存三个数据。否则大小为2然后将另外两个数据保存在另一个表中。我认为它将解决您的问题。

Answer 2

@ th3morg喜欢这个？

request.getFile(new File(fileDest)).InputStream.splitEachLine(',') {fields ->
if(fields.size()>2){
  def student= new SeniorHighSchool(
                    name: fields[0].trim(),
                    age: fields[1].trim(),
                    muchcourse: fields[2].trim()
                    )
}
else{
  def score = new Score(
  course:fields[0].trim(),
  score:fields[1].trim()  
  )
}



}

Answer 3

如果上课SeniorHighStudent“static hasMany = [scores：Score]”那么以下应该可以做到这一点：

    def currentStudent
    request.getFile(new File(fileDest)).InputStream.splitEachLine(',') {fields ->
        if(fields.size()>2){
            if(currentStudent){
                /*we've found a new student, so save the previous one*/
                currentStudent.save()
            }
            currentStudent = new SeniorHighSchool(
                    name: fields[0].trim(),
                    age: fields[1].trim(),
                    muchcourse: fields[2].trim()
            )
        }
        else{
            /*add the score to the currentStudent's scores*/
            currentStudent.addToScores(new Score(
                    course:fields[0].trim(),
                    score:fields[1].trim()
            ))
        }
    }
    /*when the loop is done, save the last student because it hasn't been saved yet*/
    currentStudent.save()