C#连接Oracle的实例教程

本文实例总结了C#连接Oracle的方法。分享给大家供大家参考，具体如下：

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

 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

 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

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

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(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

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

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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