Updating database using dataset

updating database using dataset-67
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.

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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.Dim str Select As String = _ "SELECT * FROM Categories" Dim da As Sql Data Adapter = New Sql Data Adapter(str Select, cn) ' Set the data adapter object's UPDATE, INSERT, and DELETE ' commands. Select("Category Name = 'Dairy Products'")(0) row("Description") = "Milk and stuff" ' Add a record. New Row( ) row("Category Name") = "Software" row("Description") = "Fine code and binaries" dt. For each row that is to be changed, added, or deleted, the parameters are replaced with values from the row, and the resulting SQL statement is issued to the database. 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. 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.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.To save data to the data source, you need to call the Data Adapter's Update method. I'll display the result of the Customers table in a Data Grid after adding, updating, and deleting data from the 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.The Add New method of the Data Table adds a row to a Data Table.To change an existing row's data, you can directly assign a row's value. Delete() In this example, I'll show you how to add edit, and remove, data from the Northwind database. 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 .


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