For more information, see Using Parameters with a Data Adapter.
If your Data Table maps to or is generated from a single database table, you can take advantage of the Command Builder object to automatically generate the Delete Command, Insert Command, and Update Command of the Data Adapter.
Data Public Class Main Class Shared Sub Main() Dim ds Users As New Data Set() dtm Users.
Add(dcm Last Name) ' Activate the mapping mechanism da Users.
NET application by specifying command syntax at design-time and, where possible, through the use of stored procedures.
You must explicitly set the commands before calling Update.
When the Data Adapter encounters a change to a Data Row, it uses the Insert Command, Update Command, or Delete Command to process the change.
If the Fill method encounters a primary key value for a row in the Data Set that matches a primary key value from a row in the results returned by the Select Command, it updates the existing row with the information from the row returned by the Select Command and sets the Row State of the existing row to Unchanged. Fill(ds Users) ' Set the primary key in order to use the Find() method ' below. Dim cb = New Ole Db Command Builder(da Users) ' Update an existing record in the Data Set Dim r As Data Row = ds Users. Primary Key = dca Key ' Declare a command builder to create SQL instructions ' to create and update records. For more information, see Merging Data Set Contents and Handling Data Adapter Events. The following examples demonstrate how to perform updates to modified rows by explicitly setting the Private Sub Adapter Update(By Val connection String As String) Using connection As Sql Connection = New Sql Connection( _ connection String) Dim adapter As Sql Data Adapter = New Sql Data Adapter( _ "SELECT Category ID, Category Name FROM dbo. Update Command = New Sql Command( _ "UPDATE Categories SET Category Name = @Category Name " & _ "WHERE Category ID = @Category ID", connection) adapter.