如何使用 Java 从 MongoDB 中的所有文档中获取相同键的值？

Question

I am new in working on mongodb. Here is my Mongodb documents I only want the name values.

{
    "_id" : ObjectId("5da527f784a58d78fcd0b177"),
    "name" : "Jabed",
    "email" : "jabed@gmail.com",
    "Sex" : "male",
    "age" : "19",
    "address" : "Kochukhet, Dhaka",
    "Contct" : "01797259329"
}

{
    "_id" : ObjectId("5da6f415f2bdee4b90cf41d0"),
    "name" : "Bulbul Gulzer Deb",
    "email" : "gulzer.deb@gmail.com",
    "Sex" : "male",
    "age" : "19",
    "address" : "Narinda, Dhaka",
    "Contct" : "01756223666"
}

{
    "_id" : ObjectId("5dd771907607c3e12d9183d7"),
    "name" : "Aniruddha Dey",
    "email" : "aniruddha.dey@gmail.com",
    "Sex" : "male",
    "age" : "14",
    "address" : "Narinda, Dhaka",
    "Contct" : "01745706020"
}

Expected output will be

Jabed
Bulbul Gulzer Deb
Aniruddha Dey

Answer 1

Use the projection:

db.yourdocument.find( {}, { name: 1, _id: 0 } )

More control over projected fields can be found here