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Creating the Courses Collection

    March 16, 2025
    + 12
    Your first application created a single student record for the student collection. In this part, you’re going to populate the course collection.

    Populating the course details collection

    You can use the same technique to build a store for the courses. Here’s a quick reminder of the course document structure:

    json
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    {
  "course-name": "art history",
  "faculty": "fine art",
  "credit-points" : 100
}

    The code should be familiar to you; there’s not much difference between writing to the course collection and writing to the student collection; you just have more records to deal with:

    java
    ViewCopy
    import com.couchbase.client.java.Bucket;
import com.couchbase.client.java.Cluster;
import com.couchbase.client.java.Collection;
import com.couchbase.client.java.Scope;
import com.couchbase.client.java.json.JsonObject;

import java.time.Duration;

public class InsertCourses {

    public static void main(String[] args) {
        Cluster cluster = Cluster.connect("localhost",
                "Administrator", "password");

        Bucket bucket = cluster.bucket("student-bucket");
        bucket.waitUntilReady(Duration.ofSeconds(10));
        Scope scope = bucket.scope("art-school-scope");
        Collection course_records = scope.collection("course-record-collection");    (1)

        addCourse(course_records, "ART-HISTORY-000001", "art history", "fine art", 100);
        addCourse(course_records, "FINE-ART-000002", "fine art", "fine art", 50);
        addCourse(course_records, "GRAPHIC-DESIGN-000003", "graphic design", "media and communication", 200);

        cluster.disconnect();
    }

    private static void addCourse(Collection collection, String id, String name,
                                  String faculty, int creditPoints) {

        JsonObject course = JsonObject.create()
                .put("course-name", name)
                .put("faculty", faculty)
                .put("credit-points", creditPoints);

        collection.upsert(id, course);

    }
}
    1 Note that you’re now writing to a different collection.
    Make sure that you’ve created the course-collection in the admin console before you attempt to run the program.

    You can use maven to run the application:

    sh
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    mvn exec:java -Dexec.mainClass="InsertCourses" -Dexec.cleanupDaemonThreads=false

    Use the admin console to make sure the documents have been created in the correct collection.

    Console showing the courses collection

    Next steps

    So you’ve created a cluster, a bucket, a scope and two collections. You’ve also populated your collections with documents. Well, a database isn’t much use until we can retrieve information from it, which is what you’re going to take a look at in the next part.