Cách xóa nhiều Document từ Collection MongoDB bằng Java

Interface com.mongodb.client.MongoCollection cung cấp phương thức deleteMany() để xóa nhiều document cùng lúc theo bộ lọc (filter).

Ví dụ Java

import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.bson.Document;
import org.bson.conversions.Bson;
import com.mongodb.MongoClient;

public class DeletingMultipleDocuments {
    public static void main(String args[]) {
        MongoClient mongo = new MongoClient("localhost", 27017);
        MongoDatabase database = mongo.getDatabase("myDatabase");
        MongoCollection<Document> collection = database.getCollection("students");
        // Chèn 5 document
        Document document1 = new Document("name", "Ram").append("age", 26).append("city", "Delhi");
        Document document2 = new Document("name", "Robert").append("age", 27).append("city", "Vishakhapatnam");
        Document document3 = new Document("name", "Rhim").append("age", 30).append("city", "Delhi");
        Document document4 = new Document("name", "Radha").append("age", 45).append("city", "Delhi");
        Document document5 = new Document("name", "Sarmista").append("age", 35).append("city", "Mumbai");
        List<Document> list = new ArrayList<Document>();
        list.add(document1); list.add(document2); list.add(document3);
        list.add(document4); list.add(document5);
        collection.insertMany(list);
        System.out.println("Documents Inserted");
        System.out.println("Nội dung collection:");
        FindIterable<Document> iterDoc = collection.find();
        Iterator it = iterDoc.iterator();
        while (it.hasNext()) System.out.println(it.next());
        // Xóa nhiều document có city = "Delhi"
        Bson filter = new Document("city", "Delhi");
        collection.deleteMany(filter);
        System.out.println("Document deleted successfully...");
        // In lại danh sách còn lại
        iterDoc = collection.find();
        System.out.println("Remaining documents:");
        it = iterDoc.iterator();
        while (it.hasNext()) System.out.println(it.next());
    }
}

Kết quả

Documents Inserted
Contents of the collection:
Remaining documents:
Document{{_id=5e896b042e4a2f3badebddae, name=Ram, age=26, city=Delhi}}
Document{{_id=5e896b042e4a2f3badebddaf, name=Robert, age=27, city=Vishakhapatnam}}
Document{{_id=5e896b042e4a2f3badebddb0, name=Rhim, age=30, city=Delhi}}
Document{{_id=5e896b042e4a2f3badebddb1, name=Radha, age=45, city=Delhi}}
Document{{_id=5e896b042e4a2f3badebddb2, name=Sarmista, age=35, city=Mumbai}}
Document deleted successfully...
Remaining documents:
Document{{_id=5e896b042e4a2f3badebddaf, name=Robert, age=27, city=Vishakhapatnam}}
Document{{_id=5e896b042e4a2f3badebddb2, name=Sarmista, age=35, city=Mumbai}}