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NET, Part 2 Pages: 1, 2, 3, 4 Because Data Sets are always disconnected from their data sources, making changes in a Data Set never has any effect on the data source.
To propagate changes, additions, and deletions back to a data source, call the Sql Data Adapter class's Update method, passing the Data Set and the name of the table that is to be updated. Update(ds, "Categories") ' Close the database connection. Close( ) Step 5 forces the Sql Command Builder object to generate SQL statements for performing the database update, insert, and delete operations. Select("Category Name = 'Dairy Products'")(0) ' Change the value in the Description column.
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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.
Generally we used Data Set for having the collection of Data.
Now we use this Data Set as a Data Source of any of the Data Control like; Grid View, List View etc for showing this Data to User.
Note: Keep in mind that this Update is different than a SQL UPDATE statement.
To insert, update, and delete data using a Data Adapter, you create an Ole Db Command object with INSERT, UPDATE, and DELETE statements and set the Insert Command, Update Command, and Delete Command properties of the data adapter to Ole Db Command.
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.Tags: Adult Dating, affair dating, sex dating