Video of this presentation from Cassandra Day Seattle is here: https://www.youtube.com/watch?v=sbs6YExxYqc&index=6&list=PLqcm6qE9lgKIgRKG0d-NEvYw9qYOztbci So you’ve grabbed the latest 2.0 version of the DataStax C# driver from NuGet. Now what? In this talk, Luke will walk you through some of the basics of the C# driver--how to bootstrap the driver and connect to a cluster, execute CQL, and retrieve the results. Wondering what the difference between a PreparedStatement and a SimpleStatement is? Not sure what the appropriate lifetime is for a Cluster or a Session object? What about ADO.NET and LINQ support? We’ll cover this and more, so that you can get on with building applications on top of Cassandra. Even if you’re not a C# developer (or think that C# is the handiwork of the devil), many of the concepts we’ll cover will help you get started with the other DataStax drivers as well (Python, Java, and C++).

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Cluster cluster = Cluster.Builder()
.AddContactPoint("127.0.0.1")
.Build();

6. •
var authProvider = new PlainTextAuthProvider("username", "password");
var queryOptions = new QueryOptions()
.SetConsistencyLevel(ConsistencyLevel.LocalQuorum)
.SetPageSize(1000);
Cluster cluster = Cluster.Builder().AddContactPoint("127.0.0.1")
.WithSSL()
.WithQueryOptions(queryOptions)
.WithAuthProvider(authProvider)
.Build();

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ISession session = cluster.Connect("killrvideo");

8. // Use the Cluster builder to create a cluster
Cluster cluster = Cluster.Builder().AddContactPoint("127.0.0.1").Build();
// Use the cluster to connect a session to the appropriate keyspace
ISession session = cluster.Connect("killrvideo");
// Register both Cluster and ISession instances with Windsor (as
// Singletons since it will reuse the instance)
container.Register(
Component.For<Cluster>().Instance(cluster),
Component.For<ISession>().Instance(session)
);

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var statement =
new SimpleStatement("SELECT * FROM users WHERE userid = ?");
statement = statement.Bind(145);

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PreparedStatement prepared = session.Prepare(
"SELECT * FROM user_credentials WHERE email = ?");

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BoundStatement bound =
prepared.Bind("luke.tillman@datastax.com");

14. •
BoundStatement bound = prepared.Bind(video.VideoId, video.Name);
var simple = new SimpleStatement(
"UPDATE videos SET name = ? WHERE videoid = ?"
).Bind(video.Name, video.VideoId);
// Use an atomic batch to send over all the mutations
var batchStatement = new BatchStatement();
batchStatement.Add(bound);
batchStatement.Add(simple);

15. •
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var batch =
new BatchStatement().SetBatchType(BatchType.Unlogged);

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17. •
IStatement bound =
prepared.Bind("luke.tillman@datastax.com")
.SetPageSize(100)
.SetConsistencyLevel(ConsistencyLevel.LocalOne)
.SetRetryPolicy(new DefaultRetryPolicy())
.EnableTracing();

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RowSet rows = await _session.ExecuteAsync(boundStatement);
RowSet rows = _session.Execute(boundStatement);

20. • IEnumerable<Row>
• GetValue<T>
•
•

21. • IEnumerable<Row>
• foreach
RowSet rows = await _session.ExecuteAsync(boundStatement);
foreach (Row row in rows)
{
returnList.Add(new VideoPreview
{
VideoId = row.GetValue<Guid>("videoid"),
AddedDate = row.GetValue<DateTimeOffset>("added_date"),
Name = row.GetValue<string>("name")
});
}

22. • IEnumerable<Row>
• Select()
RowSet rows = await _session.ExecuteAsync(boundStatement);
var returnList = rows.Select(row => new VideoPreview
{
VideoId = row.GetValue<Guid>(0),
AddedDate = row.GetValue<DateTimeOffset>(1),
Name = row.GetValue<string>(2)
}).ToList();

23. • IEnumerable<Row>
• Single()
SingleOrDefault()
RowSet rows = await _session.ExecuteAsync(boundStatement);
Row row = rows.SingleOrDefault();

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var statement = new SimpleStatement("INSERT INTO user_credentials (email,
password) VALUES (?, ?) IF NOT EXISTS");
statement = statement.Bind("user1@killrvideo.com", "Password1!");
RowSet rows = await _session.ExecuteAsync(statement);
var userInserted = rows.Single().GetValue<bool>("[applied]");

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boundStatement = boundStatement.SetPageSize(100);
RowSet rows = await _session.ExecuteAsync(boundStatement);
foreach (Row row in rows)
{
}

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31. •

33. •
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•

34. [Table("user_credentials")]
public class UserCredentials
{
[Column("email")]
[PartitionKey]
public string EmailAddress { get; set; }
[Column("password")]
public string Password { get; set; }
[Column("userid")]
public Guid UserId { get; set; }
}

35. •
public UserCredentials GetCredentials(string emailAddress)
{
IEnumerable<UserCredentials> results =
_session.GetTable<UserCredentials>()
.Where(uc => uc.EmailAddress == emailAddress)
.Execute();
return results.SingleOrDefault();
}

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