OleDbDataAdapter.RowUpdating Event
.NET Framework 3.0
Occurs during Update before a command is executed against the data source. The attempt to update is made. Therefore, the event occurs.
Namespace: System.Data.OleDb
Assembly: System.Data (in system.data.dll)
Assembly: System.Data (in system.data.dll)
When you use Update, there are two events that occur per data row updated. The order of execution is as follows:
-
The values in the DataRow are moved to the parameter values.
-
The OnRowUpdating event is raised.
-
The command executes.
-
If the command is set to FirstReturnedRecord, the first returned result is placed in the DataRow.
-
If there are output parameters, they are placed in the DataRow.
-
The OnRowUpdated event is raised.
-
AcceptChanges is called.
The following example shows the RowUpdating and RowUpdated events being used.
public static void CreateDataAdapter( string connectionString) { using (OleDbConnection connection = new OleDbConnection(connectionString)) { OleDbDataAdapter adapter = new OleDbDataAdapter( "SELECT * FROM Customers WHERE CustomerID = 'ALFKI'", connection); adapter.InsertCommand = new OleDbCommand( "INSERT INTO Customers (CustomerID, CompanyName) VALUES(?, ?)", connection); adapter.InsertCommand.Parameters.Add( "@CustomerID", OleDbType.VarChar, 5, "CustomerID"); adapter.InsertCommand.Parameters.Add( "@CompanyName", OleDbType.VarChar, 30, "CompanyName"); connection.Open(); DataSet custDS = new DataSet(); adapter.Fill(custDS, "Customers"); DataRow custRow = custDS.Tables["Customers"].NewRow(); custRow["CustomerID"] = "NEWCO"; custRow["CompanyName"] = "New Company"; custDS.Tables["Customers"].Rows.Add(custRow); // add handlers adapter.RowUpdating += new OleDbRowUpdatingEventHandler(OnRowUpdating); adapter.RowUpdated += new OleDbRowUpdatedEventHandler(OnRowUpdated); adapter.Update(custDS, "Customers"); // remove handlers adapter.RowUpdating -= new OleDbRowUpdatingEventHandler(OnRowUpdating); adapter.RowUpdated -= new OleDbRowUpdatedEventHandler(OnRowUpdated); foreach (DataRow row in custDS.Tables["Customers"].Rows) { if (row.HasErrors) Console.WriteLine(row.RowError); } } } protected static void OnRowUpdating(object sender, OleDbRowUpdatingEventArgs args) { if (args.StatementType == StatementType.Insert) { System.IO.TextWriter writer = System.IO.File.AppendText("Inserts.log"); writer.WriteLine("{0}: Customer {1} Inserted.", DateTime.Now, args.Row["CustomerID"]); writer.Close(); } } protected static void OnRowUpdated(object sender, OleDbRowUpdatedEventArgs args) { if (args.Status == UpdateStatus.ErrorsOccurred) { args.Row.RowError = args.Errors.Message; args.Status = UpdateStatus.SkipCurrentRow; } }
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
ADD
Show: