如何通过Java在MongoDB中一次插入多个文档 [英] How to insert multiple documents at once in MongoDB through Java

问题描述

我在我的应用程序中使用MongoDB，需要在MongoDB集合中插入多个文档。
我使用的版本是1.6

我在这里看到了一个例子

http://docs.mongodb.org/manual/core/create/

$ b

批量插入多个文档部分

其中作者正在传递一个数组来执行此操作。

当我尝试相同但为什么不允许时，请告诉我如何在多个文档中插入多个文档一次??

  package com; 
 
 import java.util.Date; 
 
 import com.mongodb.BasicDBObject; 
 import com.mongodb.DB; 
 import com.mongodb.DBCollection; 
 import com.mongodb.MongoClient; 
 
公共类App {
 
 public static void main（String [] args）{
 try {
 MongoClient mongo = new MongoClient（localhost ，27017）; 
 DB db = mongo.getDB（at）; 
 DBCollection collection = db.getCollection（people）; 
 
 / * 
 * BasicDBObject document = new BasicDBObject（）; 
 * document.put（name，mkyong）; document.put（年龄，30）; 
 * document.put（createdDate，new Date（））; table.insert（文件）; 
 * / 
 
 String [] myStringArray = new String [] {a，b，c}; 
 
 collection.insert（myStringArray）; //此行的编译错误说DBCollection类型中的方法插入（DBObject ...）不适用于参数（String []）
 
} catch（例外e）{ 
 e.printStackTrace（）; 
} 
 
} 
 
} 
  

请让我知道是什么方式，以便我可以通过java一次插入多个文档。

解决方案

DBCollection.insert 接受类型 DBObject ， List< DBObject> 的参数或者一个 DBObject 的数组，用于一次插入多个文档。您传入的是字符串数组。

您必须手动填充文档（ DBObject s），将它们插入到列出< DBObject> 或 DBObject 的数组，最终 insert 他们。

  DBObject document1 = new BasicDBObject（）; 
 document1.put（name，Kiran）; 
 document1.put（age，20）; 
 
 DBObject document2 = new BasicDBObject（）; 
 document2.put（name，John）; 
 
 List< DBObject> documents = new ArrayList<>（）; 
 documents.add（document1）; 
 documents.add（document2）; 
 collection.insert（documents）; 
  

上面的代码段与您在MongoDB shell中发出的命令基本相同：

  db.people.insert（[{name：Kiran，年龄：20}，{name：John}]）; 
  

I am using MongoDB in my application and was needed to insert multiple documents inside a MongoDB collection . The version I am using is of 1.6

I saw an example here

http://docs.mongodb.org/manual/core/create/

in the

Bulk Insert Multiple Documents Section

Where the author was passing an array to do this .

When I tried the same , but why it isn't allowing , and please tell me how can I insert multiple documents at once ??

package com;

import java.util.Date;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.MongoClient;

public class App {

    public static void main(String[] args) {
        try {
            MongoClient mongo = new MongoClient("localhost", 27017);
            DB db = mongo.getDB("at");
            DBCollection collection = db.getCollection("people");

            /*
             * BasicDBObject document = new BasicDBObject();
             * document.put("name", "mkyong"); document.put("age", 30);
             * document.put("createdDate", new Date()); table.insert(document);
             */

            String[] myStringArray = new String[] { "a", "b", "c" };

            collection.insert(myStringArray); // Compilation error at this line saying that "The method insert(DBObject...) in the type DBCollection is not applicable for the arguments (String[])"

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

Please let me know what is the way so that I can insert multiple documents at once through java .

解决方案

DBCollection.insert accepts a parameter of type DBObject, List<DBObject> or an array of DBObjects for inserting multiple documents at once. You are passing in a string array.

You must manually populate documents(DBObjects), insert them to a List<DBObject> or an array of DBObjects and eventually insert them.

DBObject document1 = new BasicDBObject();
document1.put("name", "Kiran");
document1.put("age", 20);

DBObject document2 = new BasicDBObject();
document2.put("name", "John");

List<DBObject> documents = new ArrayList<>();
documents.add(document1);
documents.add(document2);
collection.insert(documents);

The above snippet is essentially the same as the command you would issue in the MongoDB shell:

db.people.insert( [ {name: "Kiran", age: 20}, {name: "John"} ]);

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