EndExecuteNonQuery Method (DbCommandBase)
In This Topic
Ends an asynchronous invocation of the
ExecuteNonQuery method.
Syntax
Parameters
- result
- The System.IAsyncResult returned by BeginExecuteNonQuery.
Return Value
For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. For all other types of statements, the return value is -1.
Example
In the example below an easiest way of executing an asynchronous operation is shown. First, all components are set up and a connection is opened. Second, a query execution is started. The operation state (done or in progress) is checked and a report is written to the console. At last query result is rendered.
static void Async_Exec(DbConnectionBase myConnection)
{
DbCommandBase myCommand = (DbCommandBase)myConnection.CreateCommand();
myCommand.CommandText = "INSERT INTO DEPT VALUES (50,'Development','Philadelphia')";
Console.WriteLine("Starting asynchronous query execution...");
myConnection.Open();
IAsyncResult cres = myCommand.BeginExecuteNonQuery(null, null);
if (cres.IsCompleted)
Console.WriteLine("Completed.");
else
Console.WriteLine("Have to wait for operation to complete...");
try
{
int RowsAffected = myCommand.EndExecuteNonQuery(cres);
Console.WriteLine("Done. Rows affected: " + RowsAffected.ToString());
}
catch (Exception e)
{
Console.WriteLine("An exception has occurred: " + e.Message);
}
finally
{
myConnection.Close();
}
}
Public Sub Async_Exec(ByVal myConnection As DbConnectionBase)
Dim myCommand As DbCommandBase = myConnection.CreateCommand()
myCommand.CommandText = "INSERT INTO DEPT VALUES (50,'Development','Philadelphia')"
Console.WriteLine("Starting asynchronous query execution...")
myConnection.Open()
Dim cres As IAsyncResult = myCommand.BeginExecuteNonQuery(Nothing, Nothing)
If cres.IsCompleted Then
Console.WriteLine("Completed.")
Else
Console.WriteLine("Have to wait for operation to complete...")
End If
Try
Dim RowsAffected As Integer = myCommand.EndExecuteNonQuery(cres)
Console.WriteLine(String.Concat("Rows affected: ", RowsAffected.ToString()))
Catch e As Exception
Console.WriteLine(String.Concat("An exception has occurred: ", e.Message))
Finally
myConnection.Close()
End Try
End Sub
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
See Also