using System;
using System.Data;
using System.Windows.Forms;
using System.Data.OracleClient;

namespace Test
{
    /// <summary>
    /// 简洁期间，直接将实现写在构造函数中
    /// </summary>
    public class Test
    {
        public Test()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //

            string ConnectionString = "Data Source=orcl; User Id=SCOTT; Password=scott";  //连接字符串
            OracleConnection conn = new OracleConnection(ConnectionString);    //创建一个新连接
            
            try
            {
                conn.Open();    //打开连接
                OracleCommand cmd = conn.CreateCommand();

                cmd.CommandText = "select * from emp";    //SQL语句
                OracleDataReader rs = cmd.ExecuteReader();

                while (rs.Read())    //读取数据，如果rs.Read()返回为false的话，就说明到记录集的尾部了
                {
                    MessageBox.Show(rs.GetString(1));
                }

                rs.Close();
            }

            catch (Exception e)
            {
                MessageBox.Show(e.Message);
            }
            finally
            {
                conn.Close();
            }
        }
    }
}