c#連接oracle的幾種方式

一：通過System.Data.OracleClient(需要安裝Oracle客戶端並配置tnsnames.ora)
1. 添加命名空間System.Data.OracleClient引用
2. using System.Data.OracleClient;
3. 
string connString = "User ID=IFSAPP;Password=IFSAPP;Data Source=RACE;";
OracleConnection conn = new OracleConnection(connString);
try
{
    conn.Open();
    MessageBox.Show(conn.State.ToString());
}
catch (Exception ex)
{
    ShowErrorMessage(ex.Message.ToString());
}
finally
{
    conn.Close();
}

二：通過System.Data.OracleClient(需要安裝Oracle客戶端不需配置tnsnames.ora)
1. 添加命名空間System.Data.OracleClient引用
2. using System.Data.OracleClient;
3.
string connString = "User ID=IFSAPP;Password=IFSAPP;Data Source=(DESCRIPTION = (ADDRESS_LIST= (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = RACE)))";
OracleConnection conn = new OracleConnection(connString);
try
{
    conn.Open();
    MessageBox.Show(conn.State.ToString());
}
catch (Exception ex)
{
    ShowErrorMessage(ex.Message.ToString());
}
finally
{
    conn.Close();
}

三：通過System.Data.OleDb和Oracle公司的驅動
1. 添加命名空間System.Data.OracleClient引用
2. using System.Data.OleDb;
3.
string connString = "Provider=OraOLEDB.Oracle.1;User ID=IFSAPP;Password=IFSAPP;Data Source=(DESCRIPTION = (ADDRESS_LIST= (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = RACE)))";
OleDbConnection conn = new OleDbConnection(connString);
try
{
    conn.Open();
    MessageBox.Show(conn.State.ToString());
}
catch (Exception ex)
{
    ShowErrorMessage(ex.Message.ToString());
}
finally
{
    conn.Close();
}

四：通過System.Data.OleDb和微軟公司的Oracle驅動
1. 添加命名空間System.Data.OracleClient引用
2. using System.Data.OleDb;
3.
string connString = "Provider=MSDAORA.1;User ID=IFSAPP;Password=IFSAPP;Data Source=(DESCRIPTION = (ADDRESS_LIST= (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = RACE)))";
OleDbConnection cnn = new OleDbConnection(connString);
try
{
    conn.Open();
    MessageBox.Show(conn.State.ToString());
}
catch (Exception ex)
{
    ShowErrorMessage(ex.Message.ToString());
}
finally
{
    conn.Close();
}

備注：
a.XP操作系統已經安裝了微軟公司的Oracle驅動C:\Program Files\Common Files\System\Ole DB\msdaora.dll
b.該驅動需要Oracle客戶端的三個文件(oraocixe10.dll、oci.dll、ociw32.dll)放在System32下即可

五：使用ODP連接
1. 下載安裝ODP.NET(http://www.oracle.com/technetwork/developer-tools/visual-studio/downloads/index.html)
2. 安裝完全成后會產生一序列文件。
3. 找到這個安裝目錄，打開文件夾%ORACLE_HOME%\Network\Admin在這個下面建立一個tnsnames.ora的文件，其內容可以參考其下的Sample目錄下面的配置
Oracle.RACE =
(DESCRIPTION=
   (ADDRESS_LIST=
     (ADDRESS=
       (PROTOCOL=TCP)
       (HOST=127.0.0.1)
       (PORT=1521)
     )
   )
   (CONNECT_DATA=
     (SID=RACE)
     (SERVER=DEDICATED)
   )
)
Oracle.RACE為連接字符串名稱，可以隨便取。等號后面的字符串可以在Enterprise Manager Console工具中連接數據庫后的TNS描述符中拷過來
4. 引用Oracle.DataAccess命名空間
5. using Oracle.DataAccess.Client;
6. 示例代碼：
string connString = "DATA SOURCE=Oracle.RACE;PERSIST SECURITY INFO=True;USER ID=IFSAPP;password=IFSAPP";
OracleConnection conn = new OracleConnection(connString);
try
{
    conn.Open();
    OracleCommand cmd = new OracleCommand(cmdText,conn);
    OracleDataReader reader = cmd.ExecuteReader();
    this.DataGridView1.DataSource = reader;
    this.DataGridView1.DataBind();
}
catch (Exception ex)
{
    ShowErrorMessage(ex.Message.ToString());
}
finally
{
    conn.Close();
}

六：使用第三方驅動
第三方驅動有 Devart，下載驅動 http://www.devart.com/dotconnect/oracle/，但是是商業版，需要購買許可或破解
連接格式 User ID=myUsername;Password=myPassword;Host=ora;Pooling=true;Min Pool Size=0;Max Pool Size=100;Connection Lifetime=0;
1. 引用Devart.Data.Oracle命名空間
2. using Devart.Data.Oracle;
3.
OracleConnection conn = new OracleConnection();
conn.ConnectionString = "";
conn.Unicode = true;
conn.UserId = "IFSAPP";
conn.Password = "IFSAPP";
conn.Port = 1521;
conn.Server = "127.0.0.1";
conn.Sid = "RACE";
try
{
    conn.Open();
    //execute queries, etc
}
catch (Exception ex)
{
    ShowErrorMessage(ex.Message.ToString());
}
finally
{
    conn.Close();
}

七、另外的東東

在vs2010中使用c# 連接oracle 11g：

一. 在VS2010中連接 Oracle數據庫有兩種方法：

 第一種：微軟提供的連接方法 : using System.Data.OracleClient;

 第二種：Oracle自己提供的方法：using Oracle.DataAccess.Client;

 連接字符串：

connectionString="Password=czh;User ID=czh;Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=XXX.XXX.XXX.XXX)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=skydream)));"

1. 微軟提供的連接方法 : using System.Data.OracleClient;

測試例程：

   ··1.在VS2010新建控制台應用程序（C#）；

   ··2.右鍵、引用，在.NET中選擇System.Data.OracleClient；

   ··3.在程序中 using System.Data.OracleClient;

 

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.Data.OracleClient;  
  
namespace ConsoleApplication2  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            string connectionString;  
            string queryString;  
  
            connectionString = "Data Source=202.200.136.125/orcl;User ID=openlab;PassWord=open123";  
  
            queryString = "SELECT * FROM T_USER";  
  
            OracleConnection myConnection = new OracleConnection(connectionString);  
  
            OracleCommand myORACCommand = myConnection.CreateCommand();  
  
            myORACCommand.CommandText = queryString;  
  
            myConnection.Open();  
  
            OracleDataReader myDataReader = myORACCommand.ExecuteReader();  
  
            myDataReader.Read();  
  
            Console.WriteLine("email: " + myDataReader["EMAIL"]);  
  
            myDataReader.Close();  
  
            myConnection.Close();  
  
        }  
    }  
}

　　

2.Oracle自己提供的方法：using Oracle.DataAccess.Client;

 

前提條件：安裝oracle或者oracle client以及安裝 Oracle Client 。

   ··1.在VS2010新建控制台應用程序（C#）；

   ··2.右鍵、引用，在.NET/組件中選擇Oracle.DataAccess.Client；如果找不到則選擇 瀏覽，進入到oracleclient的安裝目錄尋找 Oracle.Data.Access.dll  （典型目錄為：E:\app\Administrator\product\11.2.0\client_1\ODP.NET\bin\2.x\Oracle.Data>Access.dll）

   ··3.程序中添加引用：using Oracle.DataAccess.Client;

 

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using Oracle.DataAccess.Client;  
  
namespace testConnectionOracle  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            string connectionString;  
            string queryString;  
  
            connectionString = "Data Source=202.200.155.123/orcl;User ID=openlab;PassWord=open123";  
  
            queryString = "SELECT * FROM T_USER";  
  
            OracleConnection myConnection = new OracleConnection(connectionString);  
  
            OracleCommand myORACCommand = myConnection.CreateCommand();  
  
            myORACCommand.CommandText = queryString;  
  
            myConnection.Open();  
  
            OracleDataReader myDataReader = myORACCommand.ExecuteReader();  
  
            myDataReader.Read();  
  
            Console.WriteLine("email: " + myDataReader["EMAIL"]);  
  
            myDataReader.Close();  
  
            myConnection.Close();  
  
        }  
    }  
}