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。
- 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 Properties=Excel 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('{0}') 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(',') + ")";
- 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();
- }
- }
- }
上面的TransferData基本可以直接使用，如果要考虑周全的话，可以用oledb来获取excel的表结构，并且加入ColumnMappings来设置对照字段，这样效果就完全可以做到和sqlserver的dts相同的效果了。