使用OLEDB将数据库的数据导入Excel文件

/// <summary>

        /// DataTable中的数据导入到Excel，使用OLEDB，

        /// </summary>

        /// <param name="dt">数据源Table</param>

        /// <param name="excelPath">Excel文件的完整路径</param>

        /// <param name="sheetName">Excel Sheet的名称</param>

        /// <param name="result">导入执行的结果</param>

        /// <returns></returns>

        public bool DataTableToExcel(DataTable dt,string excelPath,string sheetName,out string result)

        {

            string ConnectionString = "Provider=Microsoft.Jet.OleDb.4.0;Data Source={0};Extended ProPerties=Excel 8.0";


            if(dt == null)

            {

                result = "DataTable不能为空";

                return false;

            }


            int rows = dt.Rows.Count;   //行的数量

            int cols = dt.Columns.Count;  //列的数量


            if(rows == 0)

            {

                result =  "没有数据";

                return false;

            }


            StringBuilder sb = new StringBuilder();

            string connString = string.Format(ConnectionString,excelPath);


            //生成创建表的脚本

            sb.Append("CREATE TABLE " + sheetName + " ( ");

            

            for(int i=0;i<cols;i++)

                sb.Append(string.Format("[{0}] varchar,",dt.Columns[i].ColumnName));

            sb.Remove(sb.Length -1,1);  //移除最后一个“,”

            sb.Append(")");    //最后添加一个“)”



            using(OleDbConnection objConn = new OleDbConnection(connString))

            {

                OleDbCommand objCmd = new OleDbCommand(sb.ToString(),objConn);

                

                try

                {

                    objConn.Open();

                    objCmd.ExecuteNonQuery();

                }

                catch(Exception e)

                {

                    result = "在Excel中创建表失败，错误信息：" + e.Message;

                    return false;

                }

                //生成插入数据脚本

                #region 生成插入数据脚本

                sb.Remove(0,sb.Length);

                sb.Append("INSERT INTO " + sheetName + " ( ");

                

                for(int i=0;i<cols;i++)

                    sb.Append("[" + dt.Columns[i].ColumnName + "],");

                sb.Remove(sb.Length -1,1);  //移除最后一个“,”

                sb.Append(") values (");


                for(int i=0;i<cols;i++)

                    sb.Append("@" + dt.Columns[i].ColumnName + ",");

                sb.Remove(sb.Length -1,1); //移除最后一个

                sb.Append(")");


                #endregion


                //建立插入动作的Command

                objCmd.CommandText = sb.ToString();

                OleDbParameterCollection param = objCmd.Parameters;


                for(int i=0;i<cols;i++)

                {

                    param.Add(new OleDbParameter("@" + dt.Columns[i].ColumnName, OleDbType.VarChar));

                }


                //遍历DataTable将数据插入新建的Excel文件中

                foreach (DataRow row in dt.Rows)

                {    

                    for (int i=0; i<param.Count; i++)

                    {

                        param[i].Value = row[i]; 

                    }


                    objCmd.ExecuteNonQuery();

                }


                result =  "数据已成功导入Excel";

                return true;

            }//end using

        }