These are the mechanics of working with disconnected data.Because the applications holds on to connections only when necessary, the application becomes more scalable.
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Data Sets only hold data and do not interact with a data source.
It is the Sql Data Adapter that manages connections with the data source and gives us disconnected behavior.
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.
Database-specific providers usually access the underlying data store directly and offer the best performance, broadest functionality, and support for database-specific features.
Since a data provider needs only to implement a set of standard interfaces, the capabilities and performance of data providers for the same data source can differ significantly.
Data Grid View Public Class Form1 Dim row As Integer Dim col As Integer Dim current Time As System. Ole Db Command Builder(Ole Db Data Adapter1) Dim SQLString As String = "SELECT * FROM Table1" Dim Conn String As String = "Provider=Microsoft. OLEDB.12.0; Data Source=|Data Directory|\members.accdb; User ID=admin" Dim Ole DBConn1 As System.
Now Dim Data Set1 As New Data Set() ' Dim com As New Ole Db.
It maintains both current and original versions of data allowing the data source to be updated with changes at some future time. Connections must be managed to ensure that an application performs well and is scalable.