Introduction to Couchbase

Couchbase is a powerful NoSQL database that offers high performance, scalability, and flexibility for building modern web, mobile, and IoT applications. As a distributed database, Couchbase combines the strengths of relational databases with the flexibility of document databases, making it a popular choice for numerous industries.

Core APIs and Code Snippets

1. Connecting to Couchbase

 import couchbase.cluster.Cluster; import couchbase.cluster.ClusterOptions; import couchbase.cluster.UserPasswordAuthenticator;
Cluster cluster = Cluster.connect("couchbase://localhost", ClusterOptions.clusterOptions("username", "password")); 

2. Creating a Bucket

 Bucket bucket = cluster.bucket("myBucket"); bucket.waitUntilReady(Duration.ofSeconds(10)); 

3. Inserting a Document

 JsonObject doc = JsonObject.create()
                           .put("name", "John Doe")
                           .put("email", "john.doe@example.com");
bucket.defaultCollection().insert("user::1", doc); 

4. Retrieving a Document

 GetResult result = bucket.defaultCollection().get("user::1"); JsonObject doc = result.contentAsObject(); 

5. Updating a Document

 JsonObject updatedDoc = doc.put("email", "john.doe@newdomain.com"); bucket.defaultCollection().replace("user::1", updatedDoc); 

6. Deleting a Document

 bucket.defaultCollection().remove("user::1"); 

7. Subdocument Operations

 MutateInResult result = bucket.defaultCollection()
                              .mutateIn("user::1", Arrays.asList(MutateInSpec.upsert("address.city", "New York")));

8. Querying with N1QL

 N1qlQueryResult result = cluster.query("SELECT * FROM `myBucket` WHERE age > 30"); for (N1qlQueryRow row : result) {
  JsonObject jsonObject = row.value();
  // process the result
} 

Example Application

Let’s create a simple Java application that connects to Couchbase, creates a bucket, and performs CRUD operations on user data.

 import couchbase.cluster.Cluster; import couchbase.cluster.ClusterOptions; import couchbase.cluster.UserPasswordAuthenticator; import couchbase.core.Collection; import couchbase.json.JsonObject;
public class CouchbaseApp {
  public static void main(String[] args) {
    Cluster cluster = Cluster.connect("couchbase://localhost", ClusterOptions.clusterOptions("username", "password"));
    Bucket bucket = cluster.bucket("myBucket");
    Collection collection = bucket.defaultCollection();

    // Create a document
    JsonObject doc = JsonObject.create().put("name", "Jane Doe").put("email", "jane.doe@example.com");
    collection.insert("user::1", doc);

    // Retrieve the document
    JsonObject fetchedDoc = collection.get("user::1").contentAsObject();
    System.out.println("Fetched Document: " + fetchedDoc);

    // Update the document
    fetchedDoc.put("email", "jane.doe@newdomain.com");
    collection.replace("user::1", fetchedDoc);

    // Remove the document
    collection.remove("user::1");
  }
} 

With these sample APIs and example application, you can get started with Couchbase and leverage its powerful features for your projects.

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