Question

Somehow, I couldn’t find out how to properly pass the data when a new record gets inserted, am sending the first column value back to WCF. Everything works, but I couldn’t pass the data. What am I missing?

CLR Trigger to call WCF:

public partial class Triggers
{

    public static EndpointAddress endpoint =  new EndpointAddress(new Uri("http://localhost:8000/services/myservice"));
    public static WSHttpBinding httpBinding = new WSHttpBinding();
    public static ServiceClient.ServiceReference1.ServiceContractClient myclient = new ServiceClient.ServiceReference1.ServiceContractClient(httpBinding, endpoint);
    public delegate void MyDelagate(String crudType);
    [SqlProcedure()]
    public static void SendData(String crudType)
    {
        myclient.UpdateOccured();//i was trying to pass the crudType value here 

    }

    [Microsoft.SqlServer.Server.SqlTrigger(Name = "WCFTrigger", Target = "tbCR", Event = "FOR INSERT")]
    public static void Trigger1()
    {

        SqlCommand cmd;
        SqlTriggerContext myContext = SqlContext.TriggerContext;
        SqlPipe pipe = SqlContext.Pipe;
        SqlDataReader reader;

        if(myContext.TriggerAction== TriggerAction.Insert)
        {
            using (SqlConnection conn = new SqlConnection(@"context connection=true"))
            {
                conn.Open();
                cmd = new SqlCommand(@"SELECT * FROM tbCR", conn);
                reader = cmd.ExecuteReader();
                reader.Read();

                //get the insert value's here
                string Name;
                Name = (string)reader[1];
                reader.Dispose();


                switch (myContext.TriggerAction)
                {
                    case TriggerAction.Update:

                         SendData(Name);

                        break;

                    case TriggerAction.Insert:

                        SendData(Name);
                    break;
                }
            }
        }

    }
}

My Service Contract:

namespace SampleService
{
    class MyService : IServiceContract
    {
        public void UpdateOccured()
        {
            Console.WriteLine("Update Occured");
        }

        public void InsertOccured(string Name)
        {
            Console.WriteLine("Insert Occured",Name);
        }

    }
}

Interface:

namespace SampleService
{
    [ServiceContract]
    interface IServiceContract
    {
        [OperationContract]
        void UpdateOccured();
        [OperationContract]
        void InsertOccured(string Name);
    }
}

Answer 1

You should be selecting from INSERTED insertead of the actual table i.e.

cmd = new SqlCommand(@"SELECT * FROM INSERTED", conn);

Also, you should explicitly name the columns that you need instead of using *.

INSERTED and DELETED and SQL Server created, memory-resident tables tables.

More details

The deleted table stores copies of the affected rows during DELETE and
UPDATE statements. During the execution of a DELETE or UPDATE
statement, rows are deleted from the trigger table and transferred to
the deleted table. The deleted table and the trigger table ordinarily
have no rows in common.

The inserted table stores copies of the affected rows during INSERT
and UPDATE statements. During an insert or update transaction, new
rows are added to both the inserted table and the trigger table. The
rows in the inserted table are copies of the new rows in the trigger
table.

An update transaction is similar to a delete operation followed by an
insert operation; the old rows are copied to the deleted table first,
and then the new rows are copied to the trigger table and to the
inserted table.