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return DoExecuteXmlReader(OracleCommand); } public XmlReader ExecuteXmlReader(OracleCommand command, OracleTransaction transaction) { OracleCommand OracleCommand = CheckIfOracleCommand(command); PrepareCommand(OracleCommand, transaction); return DoExecuteXmlReader(OracleCommand); } private XmlReader DoExecuteXmlReader(OracleCommand OracleCommand) { try { DateTime startTime = DateTime.Now; XmlReader reader = OracleCommand.ExecuteXmlReader(); instrumentationProvider.FireCommandExecutedEvent(startTime); return reader; } catch (Exception e) { instrumentationProvider.FireCommandFailedEvent (OracleCommand.CommandText, ConnectionStringNoCredentials, e); throw; } } private static OracleCommand CheckIfOracleCommand(OracleCommand command) { OracleCommand OracleCommand = command as OracleCommand; if (OracleCommand == null) throw new ArgumentException(Resources.ExceptionCommandNotSqlCommand, "command"); return OracleCommand; } private void OnSqlRowUpdated(object sender, OracleRowUpdatedEventArgs rowThatCouldNotBeWritten) { if (rowThatCouldNotBeWritten.RecordsAffected == 0) { if (rowThatCouldNotBeWritten.Errors != null) { rowThatCouldNotBeWritten.Row.RowError = Resources.ExceptionMessageUpdateDataSetRowFailure; rowThatCouldNotBeWritten.Status = UpdateStatus.SkipCurrentRow; } }

MySQL Administrator makes it (a bit too) easy to remove users (and all related user/host mysql.user records). Simply right-click the user account you wish to remove and select one of the following options: Remove Host: Removing the host removes that user/host entry and all associated privileges. If there is only one user/host entry, MySQL Administrator will warn you that you will essentially be removing the user account entirely, since no remaining mysql.user entries will be available. Remove User: Removing the user will delete all record of the user and any host combinations it might have. Obviously, you should use this option with caution. MySQL Administrator asks you to confirm your impending action, as shown in Figure 15-15.

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It s just as easy to add support for canceling a long-running task with the BackgroundWorker. The first step is to set the BackgroundWorker.WorkerSupportsCancellation property to true. To request a cancellation, your form needs to call the BackgroundWorker.CancelAsync() method. In this example, the cancellation is requested when a Cancel button is clicked:

private void cmdCancel_Click(object sender, EventArgs e) { backgroundWorker.CancelAsync(); } Nothing happens automatically when you call CancelAsync(). Instead, the code that s performing the task needs to explicitly check for the cancel request, perform any required cleanup, and return. Here s how you can add this code to the FindPrimes() method so that it checks just before it reports progress: for (int i = 0; i < list.Length; i++) { ... if ((i % iteration) && (backgroundWorker != null)) { if (backgroundWorker.CancellationPending) { // Return without doing any more work. return; } if (backgroundWorker.WorkerReportsProgress) { backgroundWorker.ReportProgress(i / iteration); } } } The code in the DoWork event handler also needs to explicitly set the DoWorkEventArgs.Cancel property to true to complete the cancellation. You can then return from that method without attempting to build up the string of primes. private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e) { FindPrimesInput input = (FindPrimesInput)e.Argument; int[] primes = Worker.FindPrimes(input.From, input.To, backgroundWorker); if (backgroundWorker.CancellationPending) { e.Cancel = true; return; } // (Code for building the prime list.) }

Figure 15-15. The Remove Account confirmation dialog box For more information about using MySQL Administrator, see http://dev.mysql.com/doc/ administrator/en/mysql-administrator-introduction.html.

} protected override void DeriveParameters(DbCommand discoveryCommand) { OracleCommandBuilder.DeriveParameters((OracleCommand)discoveryCommand); } protected override int UserParametersStartIndex() { return 1; } public override string BuildParameterName(string name) { if (name[0] != this.ParameterToken) { return name.Insert(0, new string(this.ParameterToken, 1)); } return name; } protected override void SetUpRowUpdatedEvent(DbDataAdapter adapter) { ((OracleDataAdapter)adapter).RowUpdated += OnSqlRowUpdated; } protected override bool SameNumberOfParametersAndValues(DbCommand command, object[] values) { int returnParameterCount = 1; int numberOfParametersToStoredProcedure = command.Parameters.Count returnParameterCount; int numberOfValuesProvidedForStoredProcedure = values.Length; return numberOfParametersToStoredProcedure == numberOfValuesProvidedForStoredProcedure; } public virtual void AddParameter(OracleCommand command, string name, OracleDbType dbType, int size, ParameterDirection direction, bool nullable, byte precision, byte scale, string sourceColumn, DataRowVersion sourceVersion, object value) { OracleParameter parameter = CreateParameter(name, dbType, size, direction, nullable, precision, scale, sourceColumn, sourceVersion, value); command.Parameters.Add(parameter); } public void AddParameter(OracleCommand command, string name, OracleDbType dbType, ParameterDirection direction, string sourceColumn, DataRowVersion sourceVersion, object value) {

Even when you cancel an operation, the RunWorkerCompleted event still fires. At this point, you can check if the task was canceled, and handle it accordingly. private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { primeList = ""; statusPanel.Text = ""; if (e.Cancelled) { MessageBox.Show("Search cancelled."); } else if (e.Error != null) { MessageBox.Show(e.Error.Message, "An Error Occurred"); } else { primeList = (string)e.Result; statusPanel.Text = "Double-click panel to see new prime list."; } cmdFind.Enabled = true; } Now the BackgroundWorker component allows you to start a search and end it prematurely.

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