C#連接Oracle的實例教程

這篇文章主要介紹了C#連接Oracle的方法,結合實例形式總結分析了幾種常見的C#連接Oracle數據庫的操作技巧與相關注意事項,需要的朋友可以參考下

本文實例總結了C#連接Oracle的方法。分享給大家供大家參考，具體如下：

一、透過System.Data.OracleClient(需要安裝Oracle客戶端並設定tnsnames.ora)

#1.新增命名空間System.Data.OracleClient參考

 using System.Data.OracleClient;

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、透過System.Data.OracleClient(需要安裝Oracle客戶端不需要設定tnsnames. ora)

1. 新增命名空間System.Data.OracleClient引用

 using System.Data.OracleClient;

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、透過System.Data.OleDb和Oracle公司的驅動程式

#1. 新增命名空間System.Data.OracleClient引用

using System.Data.OleDb;

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、透過System.Data.OleDb和微軟公司的Oracle驅動程式

#1.新增命名空間System.Data.OracleClient引用

using System.Data.OleDb;

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();
}

備註：

a.XP作業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.該驅動程式需要Oracle客戶端的三個檔案(oraocixe10.dll、oci.dll、ociw32.dll)放在System32下即可

五、使用ODP連線

1. 下載安裝ODP.NET(www.oracle.com/technetwork/developer-tools/visual-studio/downloads/index.html)

2 . 安裝完全成後會產生一序列檔。

3. 找到這個安裝目錄，打開資料夾%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為連線字串名稱，可以隨便取。等號後面的字串可以在Enterprise Manager Console工具中連接資料庫後的TNS描述符中拷過來

4. 引用Oracle.DataAccess命名空間

using Oracle.DataAccess.Client;

6. 範例程式碼：

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、使用第三方驅動程式

第三方驅動程式有Devart，下載驅動程式www.devart.com/dotconnect/oracle/，但是是商業版，需要購買授權或破解

連線格式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

using Devart.Data.Oracle;

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();
}

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