oracle数据库连接方式

安装了Oracle Db Provider后Oracle.DataAccess.dll的路径是：D:\app\Administrator\product\11.2.0\client_1\ODP.NET\bin\2.x

下面演示了使用OleDb, msdaora, System.Data.OracleClient.OracleConnection, Oracle.DataAccess.Client.OracleConnection 以及用DbProviderFactories.GetFactory方式来获取Connection

另外如果是64位操作系统，需要安装64位的驱动

代码如下：

using System;

using System.Data;

using System.Data.Common;



namespace WinTest

{

    class Program

    {

        static void Main(string[] args)

        {

            ShowAllDbProviderFactories();



            string connString;



            /* ole db provider */

            connString = "Provider=OraOledb.Oracle;Data Source=xe;User ID=sa;Password=jack2008;";

            using (DbConnection conn = new System.Data.OleDb.OleDbConnection(connString))

            {

                TestConnection(conn);

            }



            connString = "Provider=OraOleDb.Oracle.1;Data Source=xe;User ID=sa;Password=jack2008;";

            using (DbConnection conn = new System.Data.OleDb.OleDbConnection(connString))

            {

                TestConnection(conn);

            }



            /* ms oracle provider, it is x86 version */

            //connString = "Provider=msdaora;Data Source=xe;User ID=sa;Password=jack2008;";

            //using (DbConnection conn = new System.Data.OleDb.OleDbConnection(connString))

            //{

            //    TestConnection(conn);

            //}



            connString = "Data Source=xe;User ID=sa;Password=jack2008;";

            using (DbConnection conn = new System.Data.OracleClient.OracleConnection(connString))

            {

                TestConnection(conn);

            }



            connString = "Data Source=xe;User ID=sa;Password=jack2008;";

            using (DbConnection conn = new Oracle.DataAccess.Client.OracleConnection(connString))

            {

                TestConnection(conn);

            }



            string providerInvariantName;

            providerInvariantName = "Oracle.DataAccess.Client";

            connString = "Data Source=xe;User ID=sa;Password=jack2008;";

            UseDbProviderFactoryGetConnection(providerInvariantName,connString);



            providerInvariantName = "System.Data.OracleClient";

            connString = "Data Source=xe;User ID=sa;Password=jack2008;";

            UseDbProviderFactoryGetConnection(providerInvariantName, connString);



            //connString = "Data Source=xe;User ID=sa;Password=jack2008;";

            //DbProviderFactory factory = DbProviderFactories.GetFactory("");

            //using (DbConnection conn = factory.CreateConnection())

            //{

            //    conn.ConnectionString = connString;

            //    TestConnection(conn);

            //}



            Console.WriteLine("go");

            Console.ReadLine();



        }



        



        private static void ShowAllDbProviderFactories()

        {

            /* all Db Provider Factory */

            DataTable dtFactory = DbProviderFactories.GetFactoryClasses();

            Console.WriteLine("------------------------------------");

            foreach (DataRow row in dtFactory.Rows)

            {

                //for (int i = 0; i < dtFactory.Columns.Count; i++)

                //{

                //    Console.Write("{0}\t", row[i]);

                //}

                Console.Write("{0}\t{1}", row[2], row[3]);

                Console.WriteLine();

            }

        }



        private static void UseDbProviderFactoryGetConnection(string providerInvariantName, string connString)

        {

            DbProviderFactory factory = DbProviderFactories.GetFactory(providerInvariantName);

            using (DbConnection conn = factory.CreateConnection())

            {

                conn.ConnectionString = connString;

                TestConnection(conn);

            }

        }



        private static void TestConnection(DbConnection conn)

        {

            Console.WriteLine("------------------------------------");

            string sql = "SELECT * FROM dept";

            DbCommand cmd = conn.CreateCommand();

            cmd.CommandText = sql;

            cmd.CommandType = CommandType.Text;

            conn.Open();

            using (IDataReader dr = cmd.ExecuteReader())

            {

                while (dr.Read())

                {

                    Console.WriteLine("{0}\t{1}\t{2}", dr[0], dr[1], dr[2]);

                }

            }

            conn.Close();

        }



        private static void AddParameter(DbCommand cmd, string paramName, object paramValue)

        {

            DbParameter p = cmd.CreateParameter();

            p.ParameterName = paramName;

            p.Value = paramValue ?? DBNull.Value;



            cmd.Parameters.Add(p);

        }

    }

}