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The Update then refreshes the row using the value of the Updated Row Source property. After any data is loaded back into the Data Set, the On Row Updated event is raised, allowing the user to inspect the reconciled Data Set row and any output parameters returned by the command.After a row updates successfully, the changes to that row are accepted.Public Function Create Command And Update( _ By Val connection String As String, _ By Val query String As String) As Data Set Dim data Set As Data Set = New Data Set Using connection As New Ole Db Connection(connection String) connection.Open() Dim adapter As New Ole Db Data Adapter() adapter.' Without the Ole Db Command Builder this line would fail. For every inserted, modified, and deleted row, the Update method determines the type of change that has been performed on it (Insert, Update or Delete).Depending on the type of change, the command template executes to propagate the modified row to the data source.You must explicitly set the commands before calling event and setting the Status to Skip Current Row. NVar Char, 15, "Category Name") Dim parameter As Sql Parameter = _ adapter. For more information, see Merging Data Set Contents and Handling Data Adapter Events.
To continue the update operation without generating exceptions when an error is encountered, set the Continue Update On Error property to property of the parameter should be set to the name of the column.
This allows you to maximize the performance of your ADO. For example, if a primary key value for an existing row is updated, and a new row has been added with the new primary key value as a foreign key, it is important to process the update before the insert. By specifying a subset of rows to be updated, you can control the order in which inserts, updates, and deletes are processed.
NET application by specifying command syntax at design time and, where possible, through the use of stored procedures. For example, the following code ensures that the deleted rows of the table are processed first, then the updated rows, and then the inserted rows.
Calling the Accept Changes method or Accept Changes method will commit all changes in the Data Set or Data Table.
If either of these methods are called before the Update method is called, no changes will be committed when the Update method is called, unless further changes have been made since Accept Changes or Accept Changes was called.