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;

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;

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;

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;

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();

}
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;

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();

}