Java Mongodb 简明教程

Java & MongoDB - Drop Collection

若要删除数据库，可以使用 collection.drop() 方法删除数据库中的集合。

To drop a databases, you can use collection.drop() method to drop a collection in the databases.

// Get the collection
MongoCollection<Document> collection = database.getCollection("sampleCollection");

// delete the collection
collection.drop();

Example

以下是删除集合的代码片段 −

Following is the code snippet to drop a collection −

import org.bson.Document;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;

public class Tester {
   public static void main(String[] args) {
      // Creating a Mongo client
      MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017");

      // get the database
      MongoDatabase database = mongoClient.getDatabase("myDb");

      // Retrieving a collection
      MongoCollection<Document> collection = database.getCollection("sampleCollection");

      collection.drop();
      System.out.println("Collection dropped.");
   }
}

现在，我们按照以下步骤编译并运行上述程序。

Now, let’s compile and run the above program as shown below.

$javac Tester.java
$java Tester

Output

在执行上述程序时，您将得到以下输出。

On executing, the above program gives you the following output.

Collection dropped.