helenus/README.md

casser

Java 8 Cassandra Client

Features

• Leverages Java 8 language capabilities to build CQL queries
• Simple function-style API

Requirements

• Only JVM 8
• Datastax Driver
• Maven

Example

Entity definition:

@Table("timelines")
public interface Timeline {

	@PartitionKey
	UUID getUserId();
	
	void setUserId(UUID uid);
	
	@ClusteringColumn
	@DataTypeName(Name.TIMEUUID)
	Date getTimestamp();
	
	void setTimestamp(Date ts);
	
	@Column
	String getText();
	
	void setText(String text);
}

Session initialization:

Timeline timeline = Casser.dsl(Timeline.class);
CasserSession session = Casser.init(getSession()).showCql().add(Timeline.class).autoCreateDrop().get();

Select information:

session.select(timeline::getUserId, timeline::getTimestamp, timeline::getText)
  .where(timeline::getUserId, "==", userId)
  .orderBy(timeline::getTimestamp, "desc").limit(5).sync()
  .forEach(System.out::println);

Insert information:

Timeline post = Casser.pojo(Timeline.class);
post.setUserId(userId);
post.setTimestamp(new Date(postTime+1000L*i));
post.setText("hello");
session.upsert(post).sync();