本文實例總結(jié)了C#連接Oracle的方法。分享給大家供大家參考，具體如下：
一、通過System.Data.OracleClient(需要安裝Oracle客戶端并配置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(qū)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(qū)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(tǒng)已經(jīng)安裝了微軟公司的Oracle驅(qū)動C:\Program Files\Common Files\System\Ole DB\msdaora.dll
b.該驅(qū)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(chǎn)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(nèi)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(shù)據(jù)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(qū)動
第三方驅(qū)動有 Devart，下載驅(qū)動 http://www.devart.com/dotconnect/oracle/，但是是商業(yè)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();
}
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