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23. Close the application.
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1. In the form designer, double-click the Command button. Visual Studio adds the Click event handler to the code window. 2. Add the following procedure to the code editor: 3. System.Data.SqlClient.SqlCommand cmdUpdate; 4. System.Data.DataRow drCurrent; 5. 6. cmdUpdate = this.daEmployeeList.UpdateCommand; 7. drCurrent = GetRow(); 8. 9. cmdUpdate.Parameters["@FirstName"].Value = drCurrent["FirstName"]; 10. 11. 12. 13. 14. 15. 16. 17. 18. this.dsEmployeeList1.AcceptChanges(); UpdateDisplay(); this.cnNorthwind.Open(); cmdUpdate.ExecuteNonQuery(); this.cnNorthwind.Close(); cmdUpdate.Parameters["@LastName"].Value = drCurrent["LastName"]; cmdUpdate.Parameters["@empID"].Value = drCurrent["EmployeeID"];
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This code first creates two temporary variables, and then it sets them to the Update command of the daEmployeeList DataAdapter and the row currently being displayed on the form, respectively. It then sets the three parameters in the Update command to the values of the row. Finally the connection is opened, the command executed, and the connection closed. 19. In the form designer, double-click the Fill button. Visual Studio adds the event handler to the code window. 20. Add the following procedure to the code window: 21. this.dsEmployeeList1.Employees.Clear(); 22. this.daEmployeeList.Fill(this.dsEmployeeList1.Employees); UpdateDisplay(); This code reloads the data into the DataSet from the data source and then updates the version and row status information of the form. 23. Press F5 to run the application. 24. In the First Name text box, change Steven Changed to Steven, and then click Save. The application updates the Current value of the DataRow.
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25. Click Command. The application updates the data source, but because executing the command directly does not update the DataSet, the change isn t reflected.
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26. Click Fill. The application reloads the data. Note that the First Name text box has been changed.
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27. Close the application.
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Accepting and Rejecting DataSet Changes
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The final step in the process of updating data is to set a new baseline for the DataRows. This is done by using the AcceptChanges method. The DataAdapter's Update method calls AcceptChanges automatically. If you execute a command directly, you must call AcceptChanges to update the row state values. If instead of accepting the changes made to the DataSet, you want to discard them, you can call the RejectChanges method. RejectChanges returns the DataSet to the state it was in the last time AcceptChanges was called, discard-ing all new rows, restoring deleted rows, and returning all columns to their original values. Important If you call AcceptChanges or RejectChanges prior to updating the data source, you will lose the ability to persist the changes made since the last time AcceptChanges was called using the Update method. The DataAdapter's Update method uses the RowStatus property to determine which rows to persist, and both AcceptChanges and RejectChanges set the RowStatus of every row to Unchanged. Using AcceptChanges The AcceptChanges method is supported by the DataSet, the DataTable, and the DataRow. Under most circumstances, you need only call AcceptChangeson the DataSet because it calls AcceptChanges for each DataTable that it contains, and the DataTable, in turn, calls AcceptChanges for each DataRow. When the AcceptChanges call reaches the DataRow, rows with a RowStatus of either Added or Modified will have the Original values of each column changed to the Current values, and their RowStatus will be set to Unchanged. Deleted rows will be removed from the Rows collection. Accept Changes to a DataSet
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1. Add the following code to the end of the btnCmd_Click procedure that you created in the previous exercise: 2. Me.dsEmployeeList1.AcceptChanges() UpdateDisplay() 3. Press F5 to run the application. 4. In the Last Name text box, type New after Buchanan, and then click Save. The application updates the Current value.
5. Click Command. Because the AcceptChanges method is called, the Version and RowStatus information is updated.
6. In the Last Name text box, change Buchanan New back to Buchanan, and then click Save. The application updates the Current value and RowStatus.
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