//1、添加引用 System.data.oracleClient
//2、设置连接字符串 data source是服务名(也就是在客户端sqlplus中需要输入的主机字符串)
//3、以下用法和sqlserver Access 用法一直
string strConn = "data source=oamis;user=scott;password=tiger;";
OracleConnection conn = new OracleConnection(strConn);
conn.Open();
OracleCommand cmd = new OracleCommand();
cmd.CommandText = "select * from emp";
cmd.Connection = conn;
DataSet ds = new DataSet();
OracleDataAdapter ad = new OracleDataAdapter(cmd);
ad.Fill(ds);