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using System;
using System.Linq;
using System.Threading;
using FluentCassandra.Connections;
using FluentCassandra.Types;
namespace FluentCassandra.Sandbox
{
internal class Program
{
private const string KeyspaceName = "Blog";
private static readonly Server Server = new Server("localhost");
#region Setup
private static void SetupKeyspace()
{
using (var db = new CassandraContext(keyspace: KeyspaceName, server: Server))
{
if (db.KeyspaceExists(KeyspaceName))
db.DropKeyspace(KeyspaceName);
var keyspace = db.Keyspace;
keyspace.TryCreateSelf();
keyspace.TryCreateColumnFamily<UTF8Type>("Posts");
keyspace.TryCreateColumnFamily<LongType>("Tags");
keyspace.TryCreateColumnFamily<TimeUUIDType, UTF8Type>("Comments");
}
}
#endregion
#region Console Helpers
private static void ConsoleHeader(string header)
{
Console.WriteLine(@"
************************************************
** " + header + @"
************************************************");
}
#endregion
#region Create Post
private static void CreatePost()
{
using (var db = new CassandraContext(keyspace: KeyspaceName, server: Server))
{
var key = "first-blog-post";
var postFamily = db.GetColumnFamily<UTF8Type>("Posts");
var tagsFamily = db.GetColumnFamily<LongType>("Tags");
// create post
ConsoleHeader("create post");
dynamic post = postFamily.CreateRecord(key: key);
post.Title = "My First Cassandra Post";
post.Body = "Blah. Blah. Blah. about my first post on how great Cassandra is to work with.";
post.Author = "Nick Berardi";
post.PostedOn = DateTimeOffset.Now;
// create tags
ConsoleHeader("create post tags");
dynamic tags = tagsFamily.CreateRecord(key: key);
tags[0] = "Cassandra";
tags[1] = ".NET";
tags[2] = "Database";
tags[3] = "NoSQL";
// attach the post to the database
ConsoleHeader("attaching record");
db.Attach(post);
db.Attach(tags);
// save the changes
ConsoleHeader("saving changes");
db.SaveChanges();
}
}
#endregion
#region Read Post
private static void ReadPost()
{
using (var db = new CassandraContext(keyspace: KeyspaceName, server: Server))
{
var key = "first-blog-post";
var postFamily = db.GetColumnFamily<UTF8Type>("Posts");
var tagsFamily = db.GetColumnFamily<LongType>("Tags");
// get the post back from the database
ConsoleHeader("getting 'first-blog-post'");
dynamic post = postFamily.Get(key).FirstOrDefault();
dynamic tags = tagsFamily.Get(key).FirstOrDefault();
// show details
ConsoleHeader("showing post");
Console.WriteLine(
String.Format("=={0} by {1}==\n{2}",
post.Title,
post.Author,
post.Body
));
// show tags
ConsoleHeader("showing tags");
foreach (var tag in tags)
Console.WriteLine(String.Format("{0}:{1},", (long)tag.ColumnName, tag.ColumnValue));
}
}
#endregion
#region Update Post
private static void UpdatePost()
{
using (var db = new CassandraContext(keyspace: KeyspaceName, server: Server))
{
var key = "first-blog-post";
var postFamily = db.GetColumnFamily<UTF8Type>("Posts");
// get the post back from the database
ConsoleHeader("getting 'first-blog-post' for update");
dynamic post = postFamily.Get(key).FirstOrDefault();
post.Title = post.Title + "(updated)";
post.Body = post.Body + "(updated)";
post.Author = post.Author + "(updated)";
post.PostedOn = DateTimeOffset.Now;
// attach the post to the database
ConsoleHeader("attaching record");
db.Attach(post);
// save the changes
ConsoleHeader("saving changes");
db.SaveChanges();
}
}
#endregion
#region Create Comments
private static void CreateComments()
{
using (var db = new CassandraContext(keyspace: KeyspaceName, server: Server))
{
var key = "first-blog-post";
// get the comments family
var commentsFamily = db.GetColumnFamily<TimeUUIDType, UTF8Type>("Comments");
ConsoleHeader("create comments");
dynamic postComments = commentsFamily.CreateRecord(key: key);
// lets attach it to the database before we add the comments
db.Attach(postComments);
// add 5 comments
for (int i = 0; i < 5; i++)
{
dynamic comment = postComments.CreateSuperColumn();
comment.Name = "Nick Berardi";
comment.Email = "nick@coderjournal.com";
comment.Website = "www.coderjournal.com";
comment.Comment = "Wow fluent cassandra is really great and easy to use.";
var commentPostedOn = DateTime.Now;
postComments[commentPostedOn] = comment;
Console.WriteLine("Comment " + (i + 1) + " Posted On " + commentPostedOn.ToLongTimeString());
Thread.Sleep(TimeSpan.FromSeconds(2));
}
// save the comments
db.SaveChanges();
}
}
#endregion
#region Read Comments
private static void ReadComments()
{
using (var db = new CassandraContext(keyspace: KeyspaceName, server: Server))
{
var key = "first-blog-post";
var lastDate = DateTime.Now;
// get the comments family
var commentsFamily = db.GetColumnFamily<TimeUUIDType, UTF8Type>("Comments");
for (int page = 0; page < 2; page++)
{
// lets back the date off by a millisecond so we don't get paging overlaps
lastDate = lastDate.AddMilliseconds(-1D);
ConsoleHeader("showing page " + page + " of comments starting at " + lastDate.ToLocalTime());
var comments = commentsFamily.Get(key)
.Reverse()
.Fetch(lastDate)
.Take(3)
.FirstOrDefault();
foreach (dynamic comment in comments)
{
var dateTime = (DateTime)comment.ColumnName;
Console.WriteLine(String.Format("{0:T} : {1} ({2} - {3})",
dateTime.ToLocalTime(),
comment.Name,
comment.Email,
comment.Website
));
lastDate = dateTime;
}
}
}
}
#endregion
private static void Main(string[] args)
{
SetupKeyspace();
CreatePost();
ReadPost();
UpdatePost();
ReadPost();
CreateComments();
ReadComments();
Console.Read();
}
}
}
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