[C#新手入门 六] 如何高效的将excel导入sqlserver?

来源:互联网 发布:stm32f103 flash编程 编辑:程序博客网 时间:2024/05/01 11:50

大部分人都知道用oledb来读取数据到dataset,但是读取之后怎么处理dataset就千奇百怪了。很多人通过循环来拼接sql,这样做不但容易出错而且效率低下,System.Data.SqlClient.SqlBulkCopy 对于新手来说还是比较陌生的,这个就是传说中效率极高的bcp,6万多数据从excel导入到sql只需要4.5秒。<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

using System;
using System.Data;
using System.Windows.Forms;
using System.Data.OleDb;
namespace WindowsApplication2
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }



 private void button1_Click(object sender, EventArgs e)
 {
  //测试,将excel中的sheet1导入到sqlserver中
   string connString = "server=localhost;uid=sa;pwd=sqlgis;database=master";
   System.Windows.Forms.OpenFileDialog fd = new OpenFileDialog();
  if (fd.ShowDialog() == DialogResult.OK)
  {
   TransferData(fd.FileName, "sheet1", connString);
  }
 }

  public void TransferData(string excelFile, string sheetName, string connectionString)
 {
  DataSet ds = new DataSet();
  try
  {
   //获取全部数据
   string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + excelFile + ";" + "Extended Propertie*cel 8.0;";
  OleDbConnection conn = new OleDbConnection(strConn);
  conn.Open();
   string strExcel = "";
   OleDbDataAdapter myCommand = null;
   strExcel = string.Format("select * from [{0}$]", sheetName);
   myCommand = new OleDbDataAdapter(strExcel, strConn);
   myCommand.Fill(ds, sheetName);


//如果目标表不存在则创建
  string strSql = string.Format("if object_id(&apos;{0}&apos;) is null create table {0}(", sheetName);
  foreach (System.Data.DataColumn c in ds.Tables[0].Columns)
  {
   strSql += string.Format("[{0}] varchar(255),", c.ColumnName);
  }
   strSql = strSql.Trim(&apos;,&apos;) + ")";
      using(System.Data.SqlClient.SqlConnection sqlconn = new


System.Data.SqlClient.SqlConnection(connectionString))
   {
    sqlconn.Open();
    System.Data.SqlClient.SqlCommand command = sqlconn.CreateCommand();
    command.CommandText = strSql;
    command.ExecuteNonQuery();
    sqlconn.Close();
   }
   //用bcp导入数据
   using (System.Data.SqlClient.SqlBulkCopy bcp = new


System.Data.SqlClient.SqlBulkCopy(connectionString))
   {
    bcp.SqlRowsCopied += new      


System.Data.SqlClient.SqlRowsCopiedEventHandler(bcp_SqlRowsCopied);
    bcp.BatchSize = 100;//每次传输的行数
    bcp.NotifyAfter = 100;//进度提示的行数
    bcp.DestinationTableName = sheetName;//目标表
    bcp.WriteToServer(ds.Tables[0]);
   }
  }
  catch (Exception ex)
  {
    System.Windows.Forms.MessageBox.Show(ex.Message);
  }
}
     //进度显示
     void bcp_SqlRowsCopied(object sender, System.Data.SqlClient.SqlRowsCopiedEventArgs e)
   {
    this.Text = e.RowsCopied.ToString();
    this.Update();
   }
 }
}