c#连接oracle的几种方式

c#连接oracle的几种方式

一：通过System.Data.OracleClient(需要安装Oracle客户端并配置tnsnames.ora)
1. 添加命名空间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：通过System.Data.OracleClient(需要安装Oracle客户端不需配置tnsnames.ora)
1. 添加命名空间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：通过System.Data.OleDb和Oracle公司的驱动
1. 添加命名空间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：通过System.Data.OleDb和微软公司的Oracle驱动
1. 添加命名空间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();
}

 

备注：
a.XP操作系统已经安装了微软公司的Oracle驱动C:\Program Files\Common Files\System\Ole DB\msdaora.dll
b.该驱动需要Oracle客户端的三个文件(oraocixe10.dll、oci.dll、ociw32.dll)放在System32下即可

五：使用ODP连接
1. 下载安装ODP.NET(http://www.oracle.com/technetwork/developer-tools/visual-studio/downloads/index.html)
2. 安装完全成后会产生一序列文件。
3. 找到这个安装目录，打开文件夹%ORACLE_HOME%\Network\Admin在这个下面建立一个tnsnames.ora的文件，其内容可以参考其下的Sample目录下面的配置
Oracle.RACE =
(DESCRIPTION=
(ADDRESS_LIST=
(ADDRESS=
(PROTOCOL=TCP)
(HOST=127.0.0.1)
(PORT=1521)
)
)
(CONNECT_DATA=
(SID=RACE)
(SERVER=DEDICATED)
)
)
Oracle.RACE为连接字符串名称，可以随便取。等号后面的字符串可以在Enterprise Manager Console工具中连接数据库后的TNS描述符中拷过来
4. 引用Oracle.DataAccess命名空间
5. using Oracle.DataAccess.Client;
6. 示例代码：

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：使用第三方驱动
第三方驱动有 Devart，下载驱动 http://www.devart.com/dotconnect/oracle/，但是是商业版，需要购买许可或破解
连接格式 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命名空间
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();
}

 

七、另外的东东

在vs2010中使用c# 连接oracle 11g：

一. 在VS2010中连接 Oracle数据库有两种方法：

第一种：微软提供的连接方法 : using System.Data.OracleClient;

第二种：Oracle自己提供的方法：using Oracle.DataAccess.Client;

连接字符串：

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. 微软提供的连接方法 : using System.Data.OracleClient;

测试例程：

··1.在VS2010新建控制台应用程序（C#）；

··2.右键、引用，在.NET中选择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;

 

前提条件：安装oracle或者oracle client以及安装 Oracle Client 。

··1.在VS2010新建控制台应用程序（C#）；

··2.右键、引用，在.NET/组件中选择Oracle.DataAccess.Client；如果找不到则选择 浏览，进入到oracleclient的安装目录寻找 Oracle.Data.Access.dll （典型目录为：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();

}
}
}