public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
{
if (!(value is Guid))
{
return(null);
}
Guid guid = ((Guid)value);
if (destinationType == typeof(DateTime))
{
return(GuidGenerator.GetDateTime(guid));
}
if (destinationType == typeof(DateTimeOffset))
{
return(GuidGenerator.GetDateTimeOffset(guid));
}
if (destinationType == typeof(byte[]))
{
return(CassandraConversionHelper.ConvertGuidToBytes((Guid)value));
}
if (destinationType == typeof(Guid))
{
return(guid);
}
return(null);
}
public void GetDateTime()
{
// arrange
var expected = new DateTime(1980, 3, 14, 12, 23, 42, 112, DateTimeKind.Utc);
var guid = GuidGenerator.GenerateTimeBasedGuid(expected);
// act
var actual = GuidGenerator.GetDateTime(guid);
// assert
Assert.AreEqual(expected, actual);
}
private static void Main(string[] args)
{
using (var db = new CassandraContext(keyspace: "Blog", host: "localhost"))
{
var family = db.GetColumnFamily <UTF8Type, UTF8Type>("Posts");
// create post
dynamic post = family.CreateRecord(key: "first-blog-post");
// create post details
dynamic postDetails = post.CreateSuperColumn();
postDetails.Title = "My First Cassandra Post";
postDetails.Body = "Blah. Blah. Blah. about my first post on how great Cassandra is to work with.";
postDetails.Author = "Nick Berardi";
postDetails.PostedOn = DateTimeOffset.Now;
// create post tags
dynamic tags = post.CreateSuperColumn();
tags[0] = "Cassandra";
tags[1] = ".NET";
tags[2] = "Database";
tags[3] = "NoSQL";
// add properties to post
post.Details = postDetails;
post.Tags = tags;
// attach the post to the database
Console.WriteLine("attaching record");
db.Attach(post);
// save the changes
Console.WriteLine("saving changes");
db.SaveChanges();
// get the post back from the database
Console.WriteLine("getting 'first-blog-post'");
dynamic getPost = family.Get("first-blog-post").FirstOrDefault();
// show details
dynamic getPostDetails = getPost.Details;
Console.WriteLine(
String.Format("=={0} by {1}==\n{2}",
getPostDetails.Title,
getPostDetails.Author,
getPostDetails.Body
));
// show tags
Console.Write("tags:");
foreach (var tag in getPost.Tags)
{
Console.Write(String.Format("{0}:{1},", tag.ColumnName, tag.ColumnValue));
}
Console.WriteLine();
// get the comments family
var commentsFamily = db.GetColumnFamily <TimeUUIDType, UTF8Type>("Comments");
dynamic postComments = commentsFamily.CreateRecord(key: "first-blog-post");
// 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 = i + " Nick Berardi";
comment.Email = i + " [email protected]";
comment.Website = i + " www.coderjournal.com";
comment.Comment = i + " Wow fluent cassandra is really great and easy to use.";
postComments[GuidGenerator.GenerateTimeBasedGuid()] = comment;
Console.WriteLine("Comment " + i + " Done");
Thread.Sleep(TimeSpan.FromSeconds(5));
}
// save the comments
db.SaveChanges();
DateTime lastDate = DateTime.Now;
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);
Console.WriteLine("Showing page " + page + " starting at " + lastDate.ToLocalTime());
var comments = commentsFamily.Get("first-blog-post")
.Reverse()
.Fetch(lastDate)
.Take(3)
.FirstOrDefault();
foreach (dynamic comment in comments)
{
var dateTime = GuidGenerator.GetDateTime((Guid)comment.ColumnName);
Console.WriteLine(String.Format("{0:T} : {1} ({2} - {3})",
dateTime.ToLocalTime(),
comment.Name,
comment.Email,
comment.Website
));
lastDate = dateTime;
}
}
}
Console.Read();
}
