Question

我想以这种格式（例如国家，城市和邮政编码）从csv文件中设置父ID

Greece
  Athens
    13561
    10434
Cyprus
  Larnaka
    55477

Answer 1

如果其他人遇到此类问题，我只是想帮助他们。随机ID实际上是从数据库返回的ID。如果我有一个错误，请修复它。

public class Record {
private String value;
private int level;
private int parent;
private int id;

public Record(String value, int level) {
    super();
    this.value = value;
    this.level = level;
}

Random rand = new Random();
    ArrayList<Record> records = new ArrayList<Record>();
    records.add(new Record("ελλαδα", 0));
    records.add(new Record("αθηνα", 1));
    records.add(new Record("13561", 2));
    records.add(new Record("1044", 2));
    records.add(new Record("τριπολη", 1));
    records.add(new Record("801456", 2));
    records.add(new Record("501457", 2));
    records.add(new Record("κυπρος", 0));
    records.add(new Record("λαρνακα", 1));
    records.add(new Record("987654", 2));
    records.add(new Record("654321", 2));   

    for(int i =0; i<records.size();i++) {
        if(i==0){
            records.get(i).setId(rand.nextInt(50000));
            records.get(i).setParent(-1);
        }
        if(i > 0){
            int prev_depth = records.get(i-1).getLevel();
            if(records.get(i).getLevel()>prev_depth){
                records.get(i).setParent(records.get(i-1).getId());
                records.get(i).setId(rand.nextInt(50000));
            }else if(records.get(i).getLevel()==prev_depth){
                records.get(i).setId(rand.nextInt(50000));
                records.get(i).setParent(records.get(i-1).getParent());
            }else{
                int ridx = i - 1;
                while ((prev_depth != records.get(i).getLevel()) && (ridx >= 0)){
                    prev_depth = records.get( ridx).getLevel();
                    ridx -= 1;
                }       
                records.get(i).setId(rand.nextInt(50000));
                if(ridx==-1){
                    records.get(i).setParent(-1);
                }else{
                    records.get(i).setParent(records.get(ridx).getId());
                }

            }
        }
    }
    records.stream().forEach(System.out::println);

从csv文件设置父ID

1 个答案: