Excel导入SQL数据库完整代码
protected void studentload_Click(object sender, EventArgs e)
     {//批量添加学生信息
         SqlConnection conn = DB.dataBaseConn();//链接数据库
         conn.Open();
          try
          {
             string fileurl = typename(studentFileUpload);//调用typename方法取得excel文件路径
             DataSet ds = new DataSet();//取得数据集
             ds = xsldata(fileurl);
             int errorcount = 0;//记录错误信息条数
             int insertcount = 0;//记录插入成功条数
             int updatecount = 0;//记录更新信息条数
              for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
             {
                 string stuid = ds.Tables[0].Rows[i][0].ToString();
                 string stuname = ds.Tables[0].Rows[i][1].ToString();
                 string stusex = ds.Tables[0].Rows[i][2].ToString();
                 string zhuanye = ds.Tables[0].Rows[i][3].ToString();
                 string classname = ds.Tables[0].Rows[i][4].ToString();
                 if (stuid != "" && stuname != "" && stusex != "" && zhuanye != "" && classname != "")
                 {
                                   SqlCommand selectcmd = new SqlCommand("select count(*) from zy_class   where zhuanye='" + zhuanye + "'and classname='" + classname + "'", conn);
                     int count = Convert.ToInt32(selectcmd.ExecuteScalar());
                     if (count > 0)
                     {
                         SqlCommand selectcmd2 = new SqlCommand("select count(*) from stud where   stuid='" + stuid + "'", conn);
                         int count2 = Convert.ToInt32(selectcmd2.ExecuteScalar());
                         if (count2 > 0)
                         {
                             SqlCommand updatecmd = new SqlCommand("update stud set   stuname='" + stuname + "',stusex='" + stusex + "',zhuanye='" + zhuanyei + "',classname='" + classname + "'   where stuid='" + stuid + "'", conn);
                             updatecmd.ExecuteNonQuery();
                             updatecount++;
                         }
                         else
                         {
                             SqlCommand insertcmd= new SqlCommand("insert into stud    values('" + stuid + "','" + stuname + "','" + stusex + "','" + zhuanye + "','" + classname+ "')", conn);
                             insertcmd.ExecuteNonQuery();
                             insertcount++;
                         }
                     }
                     else
                     {
                         Response.Write("<script language='javascript'>alert('专业或班级信息有错！导入失败！请检查！');</script>");
                         break;

}
                 }
                 else
                 {
                     errorcount++;
                 }
             }
             Response.Write("<script language='javascript'>alert('" + insertcount + "条数据导入成功！" + updatecount + "条数据更新成功！" + errorcount + "条数据部分信息为空没有导入！');</script>");
         }
         catch (Exception e)
         {
             Response.Write("<script language='javascript'>alert('导入失败！');</script>");
         }
         finally
         {
             conn.Close();
         }    
     }

//把EXCEL文件上传到服务器并返回文件路径

private String typename(FileUpload fileloads)
     {
         string fullfilename = fileloads.PostedFile.FileName;
         string filename = fullfilename.Substring(fullfilename.LastIndexOf("\\") + 1);
         string type = fullfilename.Substring(fullfilename.LastIndexOf(".") + 1);
         string murl = "";
         if (type == "xls")
         {
             fileloads.PostedFile.SaveAs(Server.MapPath("excel") + "\\" + filename);
             murl = (Server.MapPath("excel") + "\\" + filename).ToString();
         }
         else
         {
             Response.Write("<script language='javascript'>alert('导入文件格式不对!');</script>");

}
         return murl;
     }

//

把excel数据读入dataset返回l数据集

private DataSet xsldata(string filepath)
     {
         string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties='Excel 8.0;IMEX=1'";
         System.Data.OleDb.OleDbConnection Conn = new System.Data.OleDb.OleDbConnection(strCon);
         string strCom = "SELECT * FROM [Sheet1$]";
         Conn.Open();
         System.Data.OleDb.OleDbDataAdapter myCommand = new System.Data.OleDb.OleDbDataAdapter(strCom, Conn);
         DataSet ds = new DataSet();
         myCommand.Fill(ds, "[Sheet1$]");
         Conn.Close();
         return ds;
     }