Question

我正在使用：

运行mongoexport

mongoexport ... --fields _id, Field1

导致：

{"_id":"someId1","Field1":false}
{"_id":"someId2","Field1":true}

我更愿意获得＆＃34;标准＆＃34; CSV输出：

_id, Field1
someId1, false
someId2, true

但我无法找到合适的mongoexport参数。

Answer 1

使用此：

mongoexport --db db_name --collection collection_name --type=csv --fields _id,Field1 --out /dir/backups/myCollection.csv

如果您使用的是早期版本（mongodb 2.6），那么首先要创建一个名为fields的文件：的 fields.txt

_id

Field1

然后使用：

mongoexport --db db_name --collection collection_name --csv --fieldFile fields.txt --out /dir/backups/myCollection.csv

Answer 2

使用此：

package sample.spring.chapter01;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVRecord;
import org.hibernate.SessionFactory;
import org.springframework.core.io.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import org.springframework.transaction.TransactionStatus;
//import org.springframework.transaction.TransactionCallback;
//import org.springframework.transaction.TransactionTemplate;



@Repository(value="PieceHibernateDAO")
public class PieceHibernateDAO {

    @Autowired
    private SessionFactory sessionFactory;


    public int createPieceHibernate(final Piece piece) {
        sessionFactory.getCurrentSession().save(piece);
        return piece.getpieceid();
    }

    //public Piece getPiece


    public void fill(Resource resource) throws FileNotFoundException, IOException{
        InputStream is=resource.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(is));              


        CSVParser parser = CSVFormat.DEFAULT.withHeader().parse(br);

        for (CSVRecord record:parser) {
            String ref=record.get("référence ascensoriste").trim();
            String asc=record.get("ascensoriste").trim();
            //String desc=record.get("Description article").trim();                
            String prix=record.get("Pv");
            String category=record.get("Familie").trim();
            //System.out.println(category);
            Piece lift_comp=new Piece();




            lift_comp.setasc(asc);
           //lift_comp.setdesc(desc);
            lift_comp.setref(ref);
            lift_comp.setprice(prix);
            lift_comp.settype(category);
            lift_comp.setinfo();
            //listp.add(lift_comp);
            int cpid=lift_comp.getcompanyid(asc);
            lift_comp.setcompanyid(cpid);

            //sessionFactory.getCurrentSession().save(lift_comp);
            createPieceHibernate(lift_comp);
        }


    }



}

mongoexport CSV输出格式

2 个答案: