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Updating the database with a dataadapter and the dataset

Listing 5-50 deletes the row with the value Tst ID.

As you can see from the code, I called the Find method to find the row and called the Delete method of the Data Row.

Dim str Connection As String = _ "Data Source=localhost; Initial Catalog=Northwind;" _ & "Integrated Security=True" Dim cn As Sql Connection = New Sql Connection(str Connection) cn. The Sql Command Build Object can be examined to see what commands were created.

Open( ) ' Create a data adapter object and set its SELECT command. To see the commands that are generated in Example 8-2, add the following lines anywhere after the declaration and assignment of the autogen variable: , etc.) in each of these statements.

Row versions were discussed in the previous section, "Changing, Adding, and Deleting Rows." If desired, a Data Set object's Update Command, Insert Command, and Delete Command properties can be set directly.

Example 8-3 sets the value of Update Command and then performs an update using this command.

The Add New method of the Data Table adds a row to a Data Table.Note: The Tables member of Data Set represents all Data Table objects attached to a Data Set. Adding a Data Row to a Data Table Dim row1 As Data Row = ds. To test this source code create a Windows application, drop a Data Grid, and three buttons- Insert Command, Update Command, and Delete Command to the form.Listing 5-46 Creates a new Data Row, sets the data of Data Row members, and adds rows to the table using the Add method of Data Table. Listing 5-48 show the code on the Insert Command button-click event.The way the architecture works with the Data Adapter is that you can make any changes you want to the filled Data Set, and it won't affect the database until you call the Update method.When Update is called, the Data Adapter will attempt to execute each query (UPDATE, INSERT, DELETE) on every row of the Data Set that has been updated, inserted, and deleted.

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For example, if you call Delete on a row on the Data Set, then when Update is called on the Data Adapter, the Delete Command of the Data Adapter will be called using the particular row in the Data Set.