Updating data sources with data adapters ado net
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When you've finished, a further connection is made to the database to update it. for a fast-moving multi-user database you may want to keep it bang up to date; occasional saves within a long session will avoid everything being lost if there is an app or system crash; you might want to retrieve an autonumber ID of a new record to use in some other part of your app.
If i was wanting to edit a whole lot of data in a data grid switch items around, delete rows and new item Arrays to rows, and so forth (change heaps). I've had some problems where i've deleted rows and the row count acts like it's still there. You are best to think of a Data Grid as just a DISPLAY mechanism (which also allows editing) of data which is actually CONTAINED in the datasource.I beleive somethings act thur the data adapter and some don't. So, when you talk of moving things around, what you are actually doing is moving data around within or between the DATA SOURCES. A connection is made to bring over your data and then closed.That you may be doing that using some of the GUI facilities of the datagrid/s, and that the changes you have made in the data sources are then reflected in what the datagrids display, does not alter that basic truth. Turning to your actual question - should you "save as you go" so far as the database is concerned - my general answer would be "No". You can do what you want - as much or as little as you want - with your data and the database knows nothing about it.The answer to that problem is not, however, to keep updating the database after every change. It is to get your row count only of Current records. Using the Data Reader can increase application performance both by retrieving data as soon as it is available, and (by default) storing only one row at a time in memory, reducing system overhead.
A Data Adapter is used to retrieve data from a data source and populate tables within a Data Set. NET Framework has a Db Data Reader and a Db Data Adapter object: the .We have a table stored in Microsoft SQL Server, named Customers, in a database named test DB. Sql Client Public Class Form1 Private Sub Form1_Load(sender As Object, e As Event Args) _ Handles My Base. String", "Student Name") Add New Column(Students, "System. Get Type(column Type)) End Sub 'adding data into the table Private Sub Add New Row(By Ref table As Data Table, By Ref id As Integer,_ By Ref name As String, By Ref city As String) Dim newrow As Data Row = table.Please consult 'SQL Server' tutorial for creating databases and database tables in SQL Server. Take the following steps − When the application is run using Start button available at the Microsoft Visual Studio tool bar, it will show the following window − In this example, let us access data in a Data Grid View control using code. Load 'TODO: This line of code loads data into the 'Test DBData Set. String", "Student City") ' adding rows Add New Row(Students, 1, "Zara Ali", "Kolkata") Add New Row(Students, 2, "Shreya Sharma", "Delhi") Add New Row(Students, 3, "Rini Mukherjee", "Hyderabad") Add New Row(Students, 4, "Sunil Dubey", "Bikaner") Add New Row(Students, 5, "Rajat Mishra", "Patna") Return Students End Function Private Sub Add New Column(By Ref table As Data Table, _ By Val column Type As String, By Val column Name As String) Dim column As Data Column = _ table. New Row() newrow("Student ID") = id newrow("Student Name") = name newrow("Student City") = city table. Add(newrow) End Sub Private Sub Button1_Click(sender As Object, e As Event Args) Handles Button1.Click Dim ds As New Data Set ds = Create Data Set() Data Grid View1. , no information about the connection, database, tables, columns, or any other details about the source of the data is available in the disconnected objects. Various components of the data provider retrieve data for the application and update data.