what is sqldataadapter..


SqlDataAdapter is a part of the ADO.NET Data Provider and it resides in the System.Data.SqlClient namespace. SqlDataAdapter provides the communication between the Dataset and the SQL database. We can use SqlDataAdapter Object in combination with Dataset Object.

Dim adapter As New SqlDataAdapter

The SqlDataAdapter Object and DataSet objects are combine to perform both data access and data manipulation operations in the SQL Server Database. When the user perform the SQL operations like Select , Insert etc. in the data containing in the Dataset Object , it won't directly affect the Database, until the user invoke the Update method in the SqlDataAdapter.

Source Code:-
============

Imports System.Data.SqlClient
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim connetionString As String
Dim sqlCnn As SqlConnection
Dim sqlCmd As SqlCommand
Dim adapter As New SqlDataAdapter
Dim ds As New DataSet
Dim i As Integer
Dim sql As String

connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserNamePassword=Password"
sql = "Select * from product"

sqlCnn = New SqlConnection(connetionString)
Try
sqlCnn.Open()
sqlCmd = New SqlCommand(sql, sqlCnn)
adapter.SelectCommand = sqlCmd
adapter.Fill(ds)
For i = 0 To ds.Tables(0).Rows.Count - 1
MsgBox(ds.Tables(0).Rows(i).Item(0) & " -- " & ds.Tables(0).Rows(i).Item(1))
Next
adapter.Dispose()
sqlCmd.Dispose()
sqlCnn.Close()
Catch ex As Exception
MsgBox("Can not open connection ! ")
End Try
End Sub
End Class

Comments

Post a Comment

Popular posts from this blog

SQL SERVER noteS......ip notes....

                                FUNCTION CREATE FUNCTION Addition() RETURNS Decimal(6,3) After specifying the type of value that the function would return, you can create a body for the function. The body of a function starts with the  BEGIN  and ends with the  END  keywords. Here is an example: CREATE FUNCTION Addition() RETURNS Decimal(6,3) BEGIN END Optionally, you can type the  AS  keyword before the  BEGIN  keyword: CREATE FUNCTION Addition() RETURNS Decimal(6,3) AS BEGIN END Between the  BEGIN  and  END  keywords, which is the section that represents the body of the function, you can define the assignment the function must perform. After performing this assignment, just before the  END  keyword, you must specify the value that the function returns. Thi...
Read more

page life cycle in asp.net.......

Image
Asp.net application and pagelifecycle Introduction In this article, we will try to understand what the different events are which take place right from the time the user sends a request, until the time the request is rendered on the browser. So we will first try to understand the two broader steps of an ASP.NET request and then we will move into different events emitted from ‘ HttpHandler ’, ‘ HttpModule ’ and ASP.NET page object. As we move in this event journey, we will try to understand what kind of logic should go in each and every one of these events. This is a small Ebook for all my .NET friends which covers topics like WCF, WPF, WWF, Ajax, Core .NET, SQL, etc. You can download the same from here or else you can catch me on my daily free training here . The Two Step Process From 30,000 feet level, ASP.NET request processing is a 2 step process as shown below. User sends a request to the IIS: ASP.NET creates an environment which can process the request. In other words, it crea...
Read more

ASP.Net Page Life Cycle

Understanding the Pagelife cycle is important to develop ASP.Net application. The general Page Life Cycle Stages are: 1. Page request - Here Page is requested by the user. 2. Start – Sets the properties such as Request, Response, IsPostBack and UICulture. 3. Page initialization - Controls on the page are available and each control's UniqueID property is set. 4. Load – Controls are loaded here if it is a PostBack request. 5. Validation – Sets the IsValid property. 6. Postback Event handling – Event handlers will be called if it is PostBack. 6. Rendering - the page calls the Render method for each control, providing a text writer that writes its output to the OutputStream of the page's Response property. 7. Unload - Unload is called after the page has been fully rendered, sent to the client, and is ready to be discarded. Common life cycle Events: 1. PreInit – Start event of the Page life cycle and here every page controls are initialized. 2. Init – This is used to read or initia...
Read more