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Paradoxal Press

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Category: Programming
Level: Beginner to seasoned
900 pages
ISBN-10 097661322-0
ISBN-13 978-097661322-0
$59.99 USA
$79.99 CANADA


Listing 20-7 extracted from chapter Transactions


Listing 20-6<     > Listing 20-8


This listing can be compiled with the command line:
csc.exe /target:exe Example_20_7.cs /r:System.Transactions.dll
Errors: 0 Warnings: 1


Example_20_7.cs
using System.Data.Common;
using System.Data.SqlClient;
using System.Transactions;
class Program {
   static void Main() {
      string sCnx =
         "server = localhost ; uid=sa ; pwd =; database = ORGANIZATION";
      string sCmd1 =
         "INSERT INTO DEPARTMENTS VALUES ('COM','Communication')";
      string sCmd2 =
 "INSERT INTO EMPLOYEES VALUES ('COM','Smith','Adam','(123) 456-7899')";
      CommittableTransaction tx = new CommittableTransaction();
      try {
         using (SqlConnection cnx = new SqlConnection(sCnx)) {
            cnx.Open();

            cnx.EnlistTransaction(tx);
            DbCommand cmd = new SqlCommand(sCmd1, cnx);
            cmd.ExecuteNonQuery();
            cmd.CommandText = sCmd2;
            cmd.ExecuteNonQuery();
            tx.BeginCommit(OnCommited,null);
         // end using cnx.
      catch { }
      // Here, the code can be executed even though the
      // transaction is not commited.
   }
   static void OnCommited(System.IAsyncResult asyncResult) {
      CommittableTransaction tx = asyncResult as CommittableTransaction;
      try { 
         using (tx) { 
            tx.EndCommit(asyncResult);  
         }
      } catch (TransactionException e) {
         // The transaction didn't commit!
      }
   }
}	
Copyright Patrick Smacchia 2006 2007