如何高效的将excel导入到oracle?和前两天的SqlBulkCopy 导入到sqlserver对应,oracle也有自身的方法,只是稍微复杂些.那就是使用oracle的sql*loader功能，而sqlldr只支持类似csv格式的数据，所以要自己把excel转换一下。实现步骤：用com组件读取excel-保存为csv格式-处理最后一个字段为null的情况和表头-根据excel结构建表-生成sqlldr的控制文件-用sqlldr命令导入数据这个性能虽然没有sql的bcp快，但还是相当可观的，在我机器上1万多数据不到4秒，而且导入过程代码比较简单，也同样没有循环拼接sql插入那么难以维护。

这里也提个问题:处理csv文件的表头和最后一个字段为null的情况是否可以优化？除了我代码中的例子，我实在想不出其他办法。

using System;using System.Data;using System.Text;using System.Windows.Forms;using Microsoft.Office.Interop.Excel;using System.Data.OleDb;//引用-com-microsoft excel objects 11.0namespace WindowsApplication5{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }         ///         /// excel导入到oracle        ///         /// 文件名        /// sheet名        /// oracle命令sqlplus连接串        public void TransferData(string excelFile, string sheetName, string sqlplusString)        {            string strTempDir = System.IO.Path.GetDirectoryName(excelFile);            string strFileName = System.IO.Path.GetFileNameWithoutExtension(excelFile);            string strCsvPath = strTempDir +"\\"+strFileName + ".csv";            string strCtlPath = strTempDir + "\\" + strFileName + ".Ctl";            string strSqlPath = strTempDir + "\\" + strFileName + ".Sql";            if (System.IO.File.Exists(strCsvPath))                System.IO.File.Delete(strCsvPath);

            //获取excel对象            Microsoft.Office.Interop.Excel.Application ObjExcel = new Microsoft.Office.Interop.Excel.Application();

            Microsoft.Office.Interop.Excel.Workbook ObjWorkBook;

            Microsoft.Office.Interop.Excel.Worksheet ObjWorkSheet = null;

            ObjWorkBook = ObjExcel.Workbooks.Open(excelFile, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

            foreach (Microsoft.Office.Interop.Excel.Worksheet sheet in ObjWorkBook.Sheets)            {                if (sheet.Name.ToLower() == sheetName.ToLower())                {                    ObjWorkSheet = sheet;                    break;                }            }            if (ObjWorkSheet == null) throw new Exception(string.Format("{0} not found!!", sheetName));

            //保存为csv临时文件            ObjWorkSheet.SaveAs(strCsvPath, Microsoft.Office.Interop.Excel.XlFileFormat.xlCSV, Type.Missing, Type.Missing, false, false, false, Type.Missing, Type.Missing, false);            ObjWorkBook.Close(false, Type.Missing, Type.Missing);            ObjExcel.Quit();

            //读取csv文件，需要将表头去掉，并且将最后一列为null的字段处理为显示的null，否则oracle不会识别，这个步骤有没有好的替换方法?            System.IO.StreamReader reader = new System.IO.StreamReader(strCsvPath,Encoding.GetEncoding("gb2312"));            string strAll = reader.ReadToEnd();            reader.Close();            string strData = strAll.Substring(strAll.IndexOf("\r\n") + 2).Replace(",\r\n",",Null");

            byte[] bytes = System.Text.Encoding.Default.GetBytes(strData);            System.IO.Stream ms = System.IO.File.Create(strCsvPath);            ms.Write(bytes, 0, bytes.Length);            ms.Close();

            //获取excel表结构            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + excelFile + ";" + "Extended Properties=Excel 8.0;";            OleDbConnection conn = new OleDbConnection(strConn);            conn.Open();            System.Data.DataTable table = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Columns,                new object[] { null, null, sheetName+"$", null });

            //生成sqlldr用到的控制文件,文件结构参考sql*loader功能，本示例已逗号分隔csv，数据带逗号的用引号括起来。               string strControl =  "load data\r\ninfile '{0}' \r\nappend into table {1}\r\n"+　　　 　　                "FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '\"'\r\n(";　　            strControl = string.Format(strControl, strCsvPath,sheetName);            foreach (System.Data.DataRow drowColumns in table.Select("1=1", "Ordinal_Position"))            {                strControl += drowColumns["Column_Name"].ToString() + ",";            }

            strControl = strControl.Substring(0, strControl.Length - 1) + ")";            bytes=System.Text.Encoding.Default.GetBytes(strControl);            ms= System.IO.File.Create(strCtlPath);

            ms.Write(bytes, 0, bytes.Length);            ms.Close();

            //生成初始化oracle表结构的文件            string strSql = @"drop table {0};　　　　　　　　　　  　　                create table {0}　　　                (";            strSql = string.Format(strSql, sheetName);            foreach (System.Data.DataRow drowColumns in table.Select("1=1", "Ordinal_Position"))            {                strSql += drowColumns["Column_Name"].ToString() + " varchar2(255),";            }            strSql = strSql.Substring(0, strSql.Length - 1) + ");\r\nexit;";            bytes = System.Text.Encoding.Default.GetBytes(strSql);            ms = System.IO.File.Create(strSqlPath);

            ms.Write(bytes, 0, bytes.Length);            ms.Close();

            //运行sqlplus，初始化表            System.Diagnostics.Process p = new System.Diagnostics.Process();            p.StartInfo = new System.Diagnostics.ProcessStartInfo();            p.StartInfo.FileName = "sqlplus";            p.StartInfo.Arguments = string.Format("{0} @{1}", sqlplusString, strSqlPath);            p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;            p.StartInfo.UseShellExecute = false;            p.StartInfo.CreateNoWindow = true;            p.Start();            p.WaitForExit();

            //运行sqlldr，导入数据            p = new System.Diagnostics.Process();            p.StartInfo = new System.Diagnostics.ProcessStartInfo();            p.StartInfo.FileName = "sqlldr";            p.StartInfo.Arguments = string.Format("{0} {1}", sqlplusString, strCtlPath);            p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;            p.StartInfo.RedirectStandardOutput = true;            p.StartInfo.UseShellExecute = false;            p.StartInfo.CreateNoWindow = true;            p.Start();            System.IO.StreamReader r = p.StandardOutput;//截取输出流            string line = r.ReadLine();//每次读取一行            textBox3.Text += line + "\r\n";            while (!r.EndOfStream)            {                line = r.ReadLine();                textBox3.Text += line + "\r\n";                textBox3.Update();            }            p.WaitForExit();

            //可以自行解决掉临时文件csv，ctl和sql，代码略去        }

        private void button1_Click(object sender, EventArgs e)        {            TransferData(@"D:\test.xls", "Sheet1", "username/password@servicename");        }            }}

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/jinjazz/archive/2008/07/21/2686526.aspx