学步园

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OracleClient;
using System.Data.SqlClient;

namespace TEST
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //string connstring = "Data Source=ouc131;user=ouc;password=letu;";//如果本地有oracle客户端的话，用这种连接
            string connstring = "User Id=ouc;Password=letu;Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=222.195.*.*)(PORT=1523))(CONNECT_DATA=(SID=ouc)));Unicode=True;";

            OracleConnection conn = new OracleConnection(connstring);
            try
            {
                conn.Open();
                OracleDataAdapter AdapterSelect = new OracleDataAdapter("select * from text", conn);
                DataTable dt = new DataTable();
                AdapterSelect.Fill(dt);
                dataGridView1.DataSource = dt.DefaultView;                
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.Message);
            }
            finally
            {
                conn.Close();
            }
        }
    }
}

1.到oracle官网下载oracle client instant（http://www.oracle.com/technetwork/topics/winsoft-085727.html）解压后的dll来复制到你的exe文件夹中.(

instantclient-basic-nt-11.2.0.2.0.zip 支持多国语言,
instantclient-basiclite-nt-11.2.0.2.0.zip 只支持英文, 高版本的oracle client可连结低版本的oracle)

(或者如果你本机安装个oracle客户端, 可以在oracle客户端文件夹搜索下*oci*.dll(oci是oracle call interface)文件, 搜索的全部dll复制到你的exe文件夹中, 网上常的复制dll就是这几个dll吧)

2.连结字符串要写成(可以写到配置文件中的, 就是要写直实的地址, 端口,实例,用户名,密码)

private static string CONNECTION_STRING =
"User Id=myUserID;Password=myPassword;Data Source=(DESCRIPTION=" +
"(ADDRESS=(PROTOCOL=TCP)(HOST=myserver.server.com)(PORT=yourPort#))" +
"(CONNECT_DATA=(SID=yourSID)));";

这样就不用去读取安装客户端的tnsnames.ora中配置了

注意: 在编程, 要把刚上面的dll放到你的debug或release目录下, 就是与exe文件同目录, 不然找不到文件, 各种出错.