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Java & MongoDB - Select Document
To select a document in a collection, you can use collection.find() or collection.find(filter) methods to select documents of a collection.
// find all documents of a collection collection.find(); // find document(s) fulfiling the filter criteria collection.find(filter);
Example
Following is the code snippet to display selected documents −
import java.util.ArrayList; import java.util.List; import org.bson.Document; import com.mongodb.client.FindIterable; import com.mongodb.client.MongoClient; import com.mongodb.client.MongoClients; import com.mongodb.client.MongoCollection; import com.mongodb.client.MongoDatabase; import com.mongodb.client.model.Filters; public class Tester { public static void main(String[] args) { // Creating a Mongo client MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017"); MongoDatabase database = mongoClient.getDatabase("myDb"); // Get the collection MongoCollection<Document> collection = database.getCollection("sampleCollection"); // Find all documents FindIterable<Document> allDocuments = collection.find(); for (Document document : allDocuments) { System.out.println(document); } System.out.println("***Selected Document***"); // Select a particular document FindIterable<Document> documents = collection.find(Filters.eq("First_Name","Mahesh")); for (Document document : documents) { System.out.println(document); } } }
Now, let's compile and run the above program as shown below.
$javac Tester.java $java Tester
Output
On executing, the above program gives you the following output.
Document{{_id=60b70d426214461f10ac5c99, First_Name=Mahesh, Last_Name=Parashar, Date_Of_Birth=1990-08-21, e_mail=mahesh_parashar.123@gmail.com, phone=9034343345}} Document{{_id=60b70d426214461f10ac5c9a, First_Name=Radhika, Last_Name=Sharma, Date_Of_Birth=1995-09-26, e_mail=radhika_sharma.123@gmail.com, phone=9000012345}} Document{{_id=60b70d426214461f10ac5c9b, First_Name=Rachel, Last_Name=Christopher, Date_Of_Birth=1990-02-16, e_mail=Rachel_Christopher.123@gmail.com, phone=9000054321}} Document{{_id=60b70d426214461f10ac5c9c, First_Name=Fathima, Last_Name=Sheik, Date_Of_Birth=1990-02-16, e_mail=Fathima_Sheik.123@gmail.com, phone=9000054321}} ******** Document{{_id=60b70d426214461f10ac5c99, First_Name=Mahesh, Last_Name=Parashar, Date_Of_Birth=1990-08-21, e_mail=mahesh_parashar.123@gmail.com, phone=9034343345}}
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