using transactions with a dataset sql

... You can push these changes to the database using the following example: mySqlDataAdapter.Update(myDataSet); All your changes to myDataSet are pushed to the database as part of the transaction ... Each of the Command objects in mySqlDataAdapter will now use mySqlTransaction. Let's say you added, modified, and removed some rows from a DataTable contained in a DataSet named myDataSet. ... transaction in mySqlTransaction. You can commit those changes using the Commit() method of mySqlTransaction: mySqlTransaction.Commit(); You could also roll back those changes using the Rollback() method...

Ngày tải lên: 24/12/2013, 01:17

Ngày tải lên: 24/12/2013, 05:15

... second, and a period of one second. Update Button.Click Uses a DataAdapter to update changes made to the first DataTable back to the data source. CheckRefreshDataSet( ) This method is called ... seconds—the value of the constant DATAREFRESH_SECONDS in the sample— into the future. Finally, a thread timer is created with a TimerClassback delegate CheckRefreshDataSet, with a due time of ... database. The default view of the table is bound to a data grid on the form. A second DataTable with the auto-refreshing functionality is created that also contains the Categories table from the...

Ngày tải lên: 14/12/2013, 18:16

... it again. The DataSet in this case is referred to as a disconnected DataSet as it doesn't maintain an active connection to the database. Disconnected DataSet objects act as a data cache ... time. Instead, a better approach is to connect to the database, fetch the data into a DataSet object, and then disconnect again. The user can browse the data in the DataSet and make any changes ... Configuration Wizard. Notice that this class is defined in a namespace called NorthwindDataSetTableAdapters (as are all the other TableAdapter classes for this DataSet) . The second statement...

Ngày tải lên: 15/12/2013, 00:15

... CustomerID"; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySqlCommand; DataSet myDataSet = new DataSet( ); mySqlConnection.Open(); Console.WriteLine("Retrieving ... BY CustomerID"; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySqlCommand; DataSet myDataSet = new DataSet( ); mySqlConnection.Open(); Console.WriteLine("Retrieving ... Chapter 16 , " ;Using SQL Server's XML Support." Using the WriteXml() Method Let's say you have a DataSet object named myDataSet. Assume that myDataSet has a DataTable that...

Ngày tải lên: 24/12/2013, 01:17

... SqlCommand cmd = new SqlCommand(sqlText, conn, tran); cmd.Parameters.Add(new SqlParameter("@CategoryName", SqlDbType.NVarChar, 15)); cmd.Parameters.Add(new SqlParameter("@Description", ... for nested transactions. You want to nest transactions when using it. Solution Simulate nested transactions with savepoints when using the SQL Server .NET data provider, manage and control ... private const String CATEGORIES_TABLE = "Categories"; private DataTable dt; private SqlDataAdapter da; // . . . private void NestedTransactionForm_Load(object sender,...

Ngày tải lên: 24/12/2013, 05:15

... Creating a DataSet Object Using Visual Studio .NET In this section, you'll learn how to create a DataSet using Visual Studio .NET. N ote You'll find a completed VS .NET example ... You'll use the second step, so go ahead and click the Generate Dataset link. The Generate Dataset dialog box is then displayed, as shown in Figure 10.14 . Figure 10.14: The Generate Dataset ... form, and add code to your form to fill it using the Fill() method of a DataAdapter object. • Click the Generate Dataset link at the bottom of the Properties window of your DataAdapter. You can...

Ngày tải lên: 21/01/2014, 07:20

... Create the DataSet. DataSet ds = new DataSet( ); // Create the SQL XML DataAdapter. SqlXmlAdapter da = new SqlXmlAdapter(cmd); // Fill the DataSet. try { da.Fill(ds); } catch(Exception ... Load the list of customers into a table. SqlDataAdapter da = new SqlDataAdapter(sqlText, ConfigurationSettings.AppSettings[" ;Sql_ ConnectString"]); DataTable table = new DataTable("Customers"); ... SqlXmlAdapter methods Method Description Fill Fills a DataSet with the XML data retrieved from the SQL Server database Update Updates the SQL Server database with the changes made to the DataSet...

Ngày tải lên: 21/01/2014, 11:20

... updating a data source using a DataAdapter. Solution Associate a Transaction with the appropriate Command object from the DataAdapter. The sample code contains three event handlers: Form.Load ... sample by using a DataAdapter to load a DataTable with the Orders table from the Northwind database. A CommandBuilder is used to generate the updating logic. The default view of the DataTable ... start the transaction. SqlTransaction tran = null; tran = conn.BeginTransaction( ); [ Team LiB ] Recipe 6.5 Using a Transaction with a DataAdapter Problem You need to use a transaction...

Ngày tải lên: 21/01/2014, 11:20

... Populate a DataSet with both schema and data. Synchronize it with a new XmlDataDocument, initializing it with the DataSet in the constructor. Method 2 Populate a DataSet with a schema but no data. ... DataSet( "Orders_OrderDetails"); SqlDataAdapter da; // Fill the Order table and add it to the DataSet. da = new SqlDataAdapter("SELECT * FROM Orders", ConfigurationSettings.AppSettings[" ;Sql_ ConnectString"]); ... Bind the DataSet to the grid. dataGrid.DataSource = ds.Tables[ORDERS_TABLE].DefaultView; Cursor.Current = Cursors.Default; } private DataSet FillDataSet(bool includeData) { DataSet ds...

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