How to DataAdapter in OLEDB

OleDbDataAdapter provides the communication between the Dataset and the Data Source with the help of OleDbConnection Object . The OleDbConnection Object has no information about the data it retrieves . Similarly a Dataset has no knowledge of the Data Source where the data coming from. So the OleDbDataAdapter manage the communication between these two Objects.

OleDbDataAdapter is used to retrieve data from a data source and populate tables within a DataSet . The OleDbDataAdapter also resolves changes made to the DataSet back to the data source. The OleDbDataAdapter object allows us to populate Data Tables in a DataSet. We can use Fill method of the OleDbDataAdapter for populating data in a Dataset. The following c# Source Code shows a simple program that uses OleDbDataAdapter to retrieve data from Data Source with the help of OleDbConnection object and populate the data in a Dataset.

Full Source C#

using System; using System.Data; using System.Data.OleDb; using System.Windows.Forms; namespace WindowsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { string connetionString = null; OleDbConnection connection ; OleDbDataAdapter oledbAdapter ; DataSet ds = new DataSet(); int i = 0; connetionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Your mdb filename;"; connection = new OleDbConnection(connetionString); try { connection.Open(); oledbAdapter = new OleDbDataAdapter("select * from users", connection); oledbAdapter.Fill(ds); oledbAdapter.Dispose(); connection.Close(); for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++) { MessageBox.Show (ds.Tables[0].Rows[i].ItemArray[0].ToString ()); } } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } } }

Next : How to DataAdapter Select Command - Sql Server

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