Oracle ODBC

项目中有一个需求从Oracle中取数据然后把数据插入到MS-SQL里呀，而且要求用ODBC方式来取数据

在测试机器中引有System.Data.Odbc 命名空间，用类似的OdbcConnection， OdbcCommand，OdbcDataReader等之类的类操作Oracle，在测试机的时，代码是可以运行的，机器的环境是--操作系统：Windows server 2003，32位机器，Oracle：版本是 10g

把代码烤到另一台开发环境--操作系统： Windows  Server 2008，64位机器，Oracle：版本是10g 客户端时运行的时候，在执行ExecuteReader方法时会报错误，其实执行OdbcDataAdapter.Fill(DataTable)时也会类似的错误的，其错误信息为：算术运算溢出！

后来通过改变其读取的方式，再操作成功！不再用OdbConnmand之类的类，引入System.Data.OracleClient命名空间。

在通过Odbc代码连接Oracle时，需建立一个Odbc dsn 连接

具体通过：程序--->管理工具--->数据源：

引进System.Data.OracleClient，用Oracle本身的类库,诸如OracleCommand，具体代码如下：

View Code

using System;

using System.Collections.Generic;

using System.Text;

using System.Data.OracleClient;

using System.Data;

using System.Data.SqlClient;

using System.Data.OleDb;

using System.Data.Odbc;



namespace FAOracletoSQLApp

{

    class Program

    {

        static void Main(string[] args)

        {



            //string strOracleConn = "Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.0.120)



(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=ORACLE)));User Id=gan;Password=gan;";

           

            string strOracleConn = "DSN=ORACLE;Uid=GAN;Pwd=GAN;";



            //string strSQLconn = "Data Source=192.168.0.121;Initial Catalog=WSS_Content;Persist Security Info=True;User 



ID=sa;Password=sa";//测试

            string strSQLconn = "Provider=SQLOLEDB;Server=192.168.0.121;Database=WSS_Content;uid=sa;pwd=sa";//测试



 

            string strDeleteCommand = "delete from test ";//测试

            

            string strInsertCommand = "insert into test(UniqueID,PMail) values('{0}','{1}')";//测试

           

 

            string strOracleSelectCommand = "select EMPLOYEE_CODE as UniqueID,CONTACT_ADDRESS as PMail from v_k2";//测试

            

            



            SqlConnection sqlConn = null;

            SqlTransaction myTrans = null;

            OracleDataReader dr = null;

            SqlCommand sqlCmd = null;

            //OdbcDataAdapter da = null;

            long rownum=0;

            try

            {

                DataTable dt = new DataTable();

                //dt.Columns.Add(new DataColumn("UniqueID",typeof(string)));

                //dt.Columns.Add(new DataColumn("PMail",typeof(string)));



                sqlConn = new SqlConnection(strSQLconn);



                Console.WriteLine("Open the SQL Connection.......");

                sqlConn.Open();



                Console.WriteLine("Begin SQL Transaction.......");

                myTrans = sqlConn.BeginTransaction();



                Console.WriteLine("New SQL Command.......");

                sqlCmd = new SqlCommand();

                sqlCmd.Connection = sqlConn;

                sqlCmd.Transaction = myTrans;



                Console.WriteLine("Delete Data.......");

                sqlCmd.CommandText = strDeleteCommand;

                sqlCmd.ExecuteNonQuery();//执行删除命令



                Console.WriteLine("New Oracle ODBC Connection......");

                using (OracleConnection conn = new OracleConnection(strOracleConn))

                {

                    Console.WriteLine("Open the Oracle Connection.......");

                    conn.Open();



                    Console.WriteLine("Create Oracle Command.........");

                    OracleCommand cmd = new OracleCommand(strOracleSelectCommand, conn);

                    Console.WriteLine(cmd.CommandText);

                    //cmd.CommandType = System.Data.CommandType.Text;



                    Console.WriteLine("Create Oracle DataReader");

                    dr = cmd.ExecuteReader();

                    //Console.WriteLine("Create ODBC DataAdapter....");

                    //da = new OdbcDataAdapter(cmd);

                    //Console.WriteLine("Fill Data ....");

                    //da.Fill(dt);

                    //if (da!=null)

                    //{

                    //    foreach (DataRow dtRow in dt.Rows)

                    //    {

                    //        Console.WriteLine(string.Format("Unique ID:{0},PMail:{1}",ConvertObj(dr



["UniqueID"]),ConvertObj(dr["PMail"])));

                    //    }

                    //}

                    Console.WriteLine("Insert Data Begin......");

                    while (dr.Read())

                    {

                        rownum += 1;

                        //Console.Write("Rwonum"+rownum);

                        sqlCmd.CommandText = string.Format(strInsertCommand, ConvertObj(dr["UniqueID"]), ConvertObj(dr



["PMail"]));

                        sqlCmd.ExecuteNonQuery();//执行插入数据语句

                        if (rownum % 10000 == 0)

                        {

                            Console.WriteLine("Commit Data " + rownum + "....");

                            myTrans.Commit();

                            myTrans = sqlConn.BeginTransaction();

                            sqlCmd.Transaction = myTrans;

                        }

                    }

                    if(rownum>0&&rownum%10000!=0)

                    {

                       myTrans.Commit();

                    }

                    Console.WriteLine("Dome");

                }



            }

            catch (Exception ex)

            {

                Console.WriteLine("Eror:" + ex.Message);

                Console.WriteLine("Trace:"+ex.StackTrace);

                if (myTrans!=null)

                {

                    Console.WriteLine("Rolling Back.....");

                    myTrans.Rollback();

                    Console.WriteLine("Rolling Back  Dome.....");



                }



            }

            finally

            {

                if (dr!=null)

                {

                    dr.Close();

                    dr = null;

                }

                if (myTrans!=null)

                {

                    myTrans.Dispose();

                }

                if (sqlConn!=null)

                {

                    sqlConn.Close();

                    sqlConn = null;

                }

            }

            Console.ReadKey();

            

        }



        public static string ConvertObj(object obj)

        {

            return obj == null ? string.Empty : obj.ToString();

        }

    }

}

 Not:System.Data.OracleClient需安装Oracle客户端