Using OracleCommand to do query : Oracle « ADO.Net « C# / CSharp Tutorial

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C# / CSharp Tutorial » ADO.Net » Oracle 
32.3.5.Using OracleCommand to do query
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.OracleClient;

  public class Form1 : System.Windows.Forms.Form
  {
    private System.Windows.Forms.Button btnConnect;
    private System.Windows.Forms.Button btnRetrieve;
    private System.Windows.Forms.ListBox listJobs;

    public Form1()
    {
      this.btnConnect = new System.Windows.Forms.Button();
      this.btnRetrieve = new System.Windows.Forms.Button();
      this.listJobs = new System.Windows.Forms.ListBox();
      this.SuspendLayout();
      this.btnConnect.Location = new System.Drawing.Point(1228);
      this.btnConnect.Text = "C&onnect";
      this.btnConnect.Click += new System.EventHandler(this.btnConnect_Click);
      this.btnRetrieve.Location = new System.Drawing.Point(1264);
      this.btnRetrieve.Text = "&Retrieve";
      this.btnRetrieve.Click += new System.EventHandler(this.btnRetrieve_Click);
      this.listJobs.Font = new System.Drawing.Font("Courier New"9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
      this.listJobs.ItemHeight = 15;
      this.listJobs.Location = new System.Drawing.Point(10028);
      this.listJobs.Size = new System.Drawing.Size(524244);
      this.AutoScaleBaseSize = new System.Drawing.Size(513);
      this.ClientSize = new System.Drawing.Size(634284);
      this.Controls.Add(this.listJobs);
      this.Controls.Add(this.btnRetrieve);
      this.Controls.Add(this.btnConnect);
      this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D;
      this.MaximizeBox = false;
      this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
      this.Text = "TableDirect Sample";
      this.Load += new System.EventHandler(this.Form1_Load);
      this.ResumeLayout(false);

    }
    static void Main() 
    {
      Application.Run(new Form1());
    }

    private void btnConnect_Click(object sender, System.EventArgs e)
    {
      string connString = "User Id=hr; Password=demo; Data Source=oranet";
      if (oraConn.State != ConnectionState.Open)
      {
        try
        {
          oraConn.ConnectionString = connString;

          oraConn.Open();

          MessageBox.Show(oraConn.ConnectionString, "Successful Connection");
        }
        catch (Exception ex)
        {
          MessageBox.Show(ex.Message,"Exception Caught");
        }
      }
    }

    private OracleConnection oraConn;

    private void Form1_Load(object sender, System.EventArgs e)
    {
      oraConn = new OracleConnection();
    }

    private void btnRetrieve_Click(object sender, System.EventArgs e)
    {
      OracleCommand cmdEmployees = new OracleCommand();
      cmdEmployees.Connection = oraConn;
      cmdEmployees.CommandType = CommandType.Text;
      cmdEmployees.CommandText = "SELECT * FROM JOBS";
      string headText = "Job".PadRight(12);
      headText += "Title".PadRight(37);
      headText += "Min Salary".PadRight(12);
      headText += "Max Salary".PadRight(12);

      string headSep = "----";

      if (oraConn.State == ConnectionState.Open)
      {
        try
        {
          OracleDataReader dataReader = cmdEmployees.ExecuteReader();
          listJobs.Items.Add(headText);
          listJobs.Items.Add(headSep);
          string textLine = "";
          while (dataReader.Read())
          {
            textLine = dataReader.GetString(0);
            textLine += dataReader.GetString(1);
            textLine += dataReader.GetDecimal(2).ToString();
            textLine += dataReader.GetDecimal(3).ToString();

            listJobs.Items.Add(textLine);
          }
        }
        catch (Exception ex)
        {
          MessageBox.Show(ex.Message,"Exception Caught");
        }
      }

      cmdEmployees.Dispose();
    }
  }
32.3.Oracle
32.3.1.how to use an OleDbConnection object to connect to an Oracle database
32.3.2.A connection string using integrated security for Oracle database
32.3.3.A connection string without integrated security for Oracle database
32.3.4.Get connection state and server version
32.3.5.Using OracleCommand to do query
32.3.6.Using OracleCommand to do the query sql
32.3.7.Using OracleCommandBuilder
32.3.8.Using OracleDataAdapter
32.3.9.Using OracleDataReader to read from Oracle database
32.3.10.Using OracleParameter
32.3.11.Connect to an Oracle Database using .NET data provider for OLE DB
32.3.12.Connect to an Oracle Database using OdbcConnection
32.3.13.Connecting to an Oracle Database with OracleConnection
32.3.14.Do a delete command to Oracle database
32.3.15.Do an insert command to Oracle database
32.3.16.Do an update to Oracle database
32.3.17.Manual Loopup for Oracle database
32.3.18.Read string from OracleDataReader
32.3.19.Use OracleConnection to connect to Oracle database
32.3.20.Rollback for Oracle database
32.3.21.Runs the CustomerAdd stored procedure.
32.3.22.No Connection Pooling
32.3.23.Read decimal from OracleDataReader
32.3.24.Connection String for Oracle database
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