Dataadapter SelectCommand - Sql Server

SqlDataAdapter, being an integral component of the ADO.NET Data Provider, facilitates the interaction between the Dataset and the Data Source through the utilization of the SqlConnection Object. Its primary purpose is to establish effective communication between these entities, ensuring seamless data retrieval.

One of the key features of the SqlDataAdapter is its ability to work in conjunction with the DataSet, enabling a disconnected data retrieval mechanism. This means that the SqlDataAdapter retrieves the data from the Data Source and populates the DataSet, allowing subsequent data access and manipulation without a continuous connection to the Data Source.

The SelectCommand property of the SqlDataAdapter plays a crucial role in this process. It represents a Command object responsible for retrieving data from the Data Source. By assigning a valid SQL query or stored procedure to the SelectCommand property, the SqlDataAdapter executes the command and retrieves the corresponding data from the Data Source.

Consider the following program, which demonstrates the usage of the SqlDataAdapter's SelectCommand property to retrieve data from a Data Source:

Full Source VB.NET
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 connection As SqlConnection Dim adapter As New SqlDataAdapter Dim ds As New DataSet Dim i As Integer connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password" connection = New SqlConnection(connetionString) Try connection.Open() adapter.SelectCommand = New SqlCommand("Your SQL Statement Here", connection) adapter.Fill(ds) connection.Close() For i = 0 To ds.Tables(0).Rows.Count - 1 MsgBox(ds.Tables(0).Rows(i).Item(1)) Next Catch ex As Exception MsgBox(ex.ToString) End Try End Sub End Class

The program demonstrates how to access and manipulate the retrieved data within the program by iterating over the DataTable's rows and performing desired operations.

Through the utilization of the SqlDataAdapter and its SelectCommand property, data retrieval from a Data Source becomes a straightforward and efficient process, empowering developers to seamlessly integrate and utilize data in their applications.