Question

如何使用java编写mongodb查询

 db.Tasks.find({'assignedMember': {'$elemMatch': {'userId': '54782bfce4b086cb31d51dd5', 'status': 'ASSIGNED'}}}).pretty()

Answer 1

以下是OP中查询的Java代码。您可能需要在以下代码中相应地更改集合名称和数据库名称。

MongoDB Java驱动程序版本= 3.2.2

import org.bson.Document;

import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;

public class GetDataFromMongodbUsingElemMatch {
    public static void main(String[] args) {

        MongoClient client = new MongoClient();

        MongoDatabase database = client.getDatabase("localhost");

        MongoCollection<Document> userCollection = database.getCollection("users");

        FindIterable<Document> users = userCollection.find(Filters.elemMatch("assignedMember",
                Filters.and(Filters.eq("userId", "54782bfce4b086cb31d51dd5"), Filters.eq("status", "ASSIGNED"))));

        for (Document user : users) {
            System.out.println(user.toJson());
        }

        client.close();

    }

}

用于测试此代码的测试文档： -

{
    "_id" : ObjectId("583805ac204e6a612ebaf7e0"),
    "assignedMember" : [ 
        {
            "userId" : "54782bfce4b086cb31d51dd5",
            "status" : "ASSIGNED"
        }
    ]
}

<强>输出： -

{ "_id" : { "$oid" : "583805ac204e6a612ebaf7e0" }, "assignedMember" : [{ "userId" : "54782bfce4b086cb31d51dd5", "status" : "ASSIGNED" }] }

如何使用java在这个mongodb查询中使用哈希映射编写

1 个答案: