ASP.NET Excel导入到SQL Server数据库

本文转自：http://www.cnblogs.com/lhking/archive/2009/06/08/1499002.html

提供把Excel里的数据导入到SQL Server 数据库，前提是Excel里的字段在Sql Server表里都有，不然会出现错误。注释很详细哦！要引用的命名空间是：
using System.Data.OleDb;
using System.Data.SqlClient;

 public class ExcelToSQL
 {
     //string SqlConnectionString = "Server=(local);Initial Catalog=Test;Integrated Security=True";
     public SqlConnection sqlcon;        //创建SQL连接
     public SqlCommand sqlcom;          //创建SQL命令对象

     public ExcelToSQL()
     {
         DataOperation dataOperation = new DataOperation(); //用到平台的函数，就是初始化SqlConnection对象
         DBUnit dbUnit = dataOperation.GetDbUnit();
         sqlcon = (SqlConnection)dbUnit.cnt;
         if (sqlcon.State.ToString() == "Open")
             sqlcon.Close();
     }
     public int ImportSql(string excelPath, string tableName)  //导入的Excel的路径，数据库里的表名
     {
         if (!TableExist(tableName)) //表名是否存在
             return (int)ImportState.tableNameError;

         DataTable dt = ExcelToDataTable(excelPath);
        if (dt == null)
         {
             return (int)ImportState.excelFormatError;
         }
         ArrayList tableField = GetTableField(tableName);   //表格的列名称

         string columnName = "ID,"; //Excel里的列名，增加一个ID列
         for (int i = ; i < dt.Columns.Count; i++)
         {
             columnName += dt.Columns[i].ColumnName + ",";
             string currentColumn = dt.Columns[i].ToString().ToUpper(); //当前列名
             for (int j = ; j < tableField.Count; j++)
             {
                 if (tableField[j].ToString().ToUpper() == dt.Columns[i].ToString().ToUpper())
                     break;   //跳出本层和上一层循环，continue是跳出本层循环，如果用continue，会继续执行j++
                 //Excel里的字段必须在Sql中都有
                 if ((tableField[j].ToString().ToUpper() != dt.Columns[i].ToString().ToUpper()) && j == tableField.Count - )
                     return (int)ImportState.fieldMatchError;
             }
         }
         int m = columnName.LastIndexOf(',');
         columnName = columnName.Remove(m);  //移除最后一个逗号

         sqlcom = new SqlCommand();
         sqlcom.Connection = sqlcon;
         sqlcon.Open();
         sqlcom.CommandType = CommandType.Text;

         for (int h = ; h < dt.Rows.Count; h++)
         {
             string value = "'" + System.Guid.NewGuid().ToString() + "'" + ",";
             for (int k = ; k < dt.Columns.Count; k++) //根据列名得到值
             {
                 value += "'" + dt.Rows[h][k].ToString() + "'" + ",";
             }
             value = value.Remove(, );
             int n = value.LastIndexOf(',');
             value = value.Remove(n);    //移除最后一个逗号
             n = value.LastIndexOf("'");
             value = value.Remove(n);

             try
             {
                 string sql = "insert into " + tableName + "(" + columnName + ") values('" + value + "')";
                 sqlcom.CommandText = sql;
                 string sss = sqlcom.ExecuteNonQuery().ToString();
             }
             catch (Exception err)
             {
                 string erroe = err.Message;
                 return (int)ImportState.dataTypeError;
             }
         }
         sqlcon.Close();
         sqlcom.Dispose();

         return (int)ImportState.right;
     }
     public DataTable ExcelToDataTable(string excelPath)  //把Excel里的数据转换为DataTable，并返回DataTable
     {
            string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + excelPath + ";Extended Properties='Excel 8.0;IMEX=1'";
         System.Data.OleDb.OleDbConnection Conn = new System.Data.OleDb.OleDbConnection(strCon);
         string strCom = "SELECT * FROM [Sheet1$]";
         DataTable dt;
         try
         {
             Conn.Open();
             System.Data.OleDb.OleDbDataAdapter myCommand = new System.Data.OleDb.OleDbDataAdapter(strCom, Conn);
             DataSet ds = new DataSet();
             myCommand.Fill(ds, "[Sheet1$]");
             Conn.Close();
             dt = ds.Tables[];
         }
         catch(Exception err)
         {
             return null;
         }
         return dt;
     }
     public bool TableExist(string tableName) //查看数据库里是否有此表名
     {
         sqlcom = new SqlCommand();
         sqlcom.Connection = sqlcon;
         sqlcom.CommandType = CommandType.Text;
         try
         {
             sqlcon.Open();
             string sql = "select name from sysobjects where type='u'";
             sqlcom.CommandText = sql;
             SqlDataReader sqldr = sqlcom.ExecuteReader();
             while (sqldr.Read())
             {
                 if (sqldr.GetString().ToUpper() == tableName.ToUpper())
                     return true;
             }
         }
         catch { return false; }
         finally
         {
             sqlcon.Close();
         }
         return false;
     }
     public ArrayList GetTableField(string tableName)  //得到数据库某一个表中的所有字段
     {
         ArrayList al = new ArrayList();
         sqlcom = new SqlCommand();
         sqlcom.Connection = sqlcon;
         sqlcom.CommandType = CommandType.Text;
         try
         {
             sqlcon.Open();
             string sql = "SELECT b.name FROM sysobjects a INNER JOIN syscolumns b ON a.id = b.id WHERE (a.name = '" + tableName + "')";
             sqlcom.CommandText = sql;
             SqlDataReader sqldr = sqlcom.ExecuteReader();
             while (sqldr.Read())
             {
                 al.Add(sqldr.GetString());
             }
         }
         finally
         {
             sqlcon.Close();
         }
         return al; //返回的是表中的字段
     }
     public enum ImportState
     {
         right = , //成功
         tableNameError = ,//表名不存在
         fieldMatchError = ,//excel里的字段和数据库表里的字段不匹配
         dataTypeError = , //转换数据类型时发生错误
         excelFormatError=,//Excel格式不能读取
     }
     public void Alert(string str)
     {
         HttpContext.Current.Response.Write("<script language='javascript'>alert('" + str + "');</script>");
     }
 }

页面调用：

  protected void btnExport_Click(object sender, EventArgs e)
     {
         string filepath = this.fileUpload.PostedFile.FileName;
         if (filepath != "")
         {
             if (this.txtTableName.Text != "")
             {
                 if (filepath.Contains("xls"))
                 {
                     int result = ets.ImportSql(filepath, this.txtTableName.Text);

                     if (result == (int)ExcelToSQL.ImportState.tableNameError)
                         ets.Alert("此表名在数据中不存在！");
                    else if(result==(int)ExcelToSQL.ImportState.excelFormatError)
                         ets.Alert("Excel格式不能正确读取！");
                     else if (result == (int)ExcelToSQL.ImportState.fieldMatchError)
                         ets.Alert("Excel里的字段和Sql Server里的字段不匹配！");
                     else if(result==(int)ExcelToSQL.ImportState.dataTypeError)
                         ets.Alert("转换数据类型时发生错误!");
                     else if (result == (int)ExcelToSQL.ImportState.right)
                     {
                         ets.Alert("导入成功");
                     }
                 }
                 else ets.Alert("上传的文件类型必须为excel文件！");
             }
             else ets.Alert("表名不能为空！");
         }
         else ets.Alert("没有选择要上传的文件！");
     }

前台代码：

  <form id="form1" runat="server">
     <div>
         <asp:Label ID="Label1" runat="server" Text="路径"></asp:Label>
         &nbsp;<asp:FileUpload ID="fileUpload" runat="server" Width="443px" /><br />
         <asp:Label ID="Label2" runat="server" Text="数据库表名称"></asp:Label>&nbsp;
         <asp:TextBox ID="txtTableName" runat="server"></asp:TextBox><br />
         <asp:Button ID="btnExport" runat="server" Text="导入到SQL" OnClick="btnExport_Click" />
     </div>
     </form>