[C#.net]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;

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;

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;

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;

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;

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();
}

環境變量中orcal_home要設置對，orcal客戶端要安裝好，同時，network\admin下tnsnames.ora配置好。

#DATABASENAME =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
# )
# (CONNECT_DATA =
# (SERVICE_NAME = servicename)
# )
# )配置示例  DATABASENAME==Data Source DATABASENAME==Data Source DATABASENAME==Data Source 重要的事寫三遍。

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