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If INSERT, UPDATE, or DELETE statements have not been specified, the method generates an exception.
However, you can create a Sql Command Builder or Ole Db Command Builder object to automatically generate SQL statements for single-table updates if you set the Select Command property of a . Then, any additional SQL statements that you do not set are generated by the Command Builder.
Example 8-2 shows an example of allowing an Sql Data Adapter object to infer the SQL ' Open a database connection. If any of these properties had been set on the Sql Data Adapter object, those values would have been used instead.
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.
Command parameters can be used to specify input and output values for an SQL statement or stored procedure for each modified row in a Data Set.
method determines the type of change that has been performed on it (Insert, Update or Delete).
Use the Sql Command Builder class's ability to auto- ' generate these commands from the SELECT command. The choice of which value from the row to use for which parameter is controlled by the Sql Command object's Parameters property.
Dim autogen As New Sql Command Builder(da) ' Load a data set. Fill(ds, "Categories") ' Get a reference to the "Categories" Data Table. This property contains an Sql Parameter Collection object that in turn contains one Sql Parameter object for each formal parameter.
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 connection is closed before Fill is called, it is opened to retrieve data, then closed.If the connection is open before Fill is called, it remains open. NET Framework data provider to connect to a data source and Command objects to retrieve data from and resolve changes to the data source. The Sql Data Adapter uses the Connection object of the .