using System;
using System.Data;
using System.Data.OleDb;
using System.Text;
using System.IO;
namespace Hxh.API
{
 /// <summary>
 /// ExcelOpration 的摘要說明。
 /// </summary>
 public class ExcelOpration
 {
 OleDbConnection Conn;
 string connString ;
 string FileName;
 public ExcelOpration()
 {
  //
  // TODO: 在此處添加構造函數邏輯
  //
 }
 public ExcelOpration(string _FileName)
 {
  //
  // TODO: 在此處添加構造函數邏輯
  //
  FileName = _FileName;
 }
 /// <summary>
 /// 打開連接
 /// </summary>
 private void Open()
 {
  if(Conn==null)
  {
  //在此處設置訪問的數據庫文件
  connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + FileName +";Extended Properties=Excel 8.0;";
  Conn=new OleDbConnection(connString);
  Conn.Open();
  }
  else if(Conn.State==System.Data.ConnectionState.Closed)
  Conn.Open();
 }
 /// <summary>
 /// 關閉連接
 /// </summary>
 public void Close()
 {
  if (Conn != null)
  Conn.Close();
 }
 /// <summary>
 /// 導入數據到Excel
 /// </summary>
 /// <param name="OutTable"></param>
 public void ImportData(DataTable OutTable)
 {
  CreateExcel(OutTable);
  InsertData(OutTable);
 }
 /// <summary>
 /// 創建Excel文件和表頭
 /// </summary>
 private void CreateExcel(DataTable OutTable)
 {
  StringBuilder sb = new StringBuilder();
  if(File.Exists(FileName))
  {
  File.Delete(FileName);
  }
  sb.Append("create table Sheet1(");
  foreach(DataColumn col in OutTable.Columns)
  {
  sb.Append(col.ColumnName+" varchar,");
  }
  sb.Remove(sb.Length-1,1);
  sb.Append(")");
  Open();
  OleDbCommand OleCmd = new OleDbCommand();
  OleCmd.Connection = Conn;
  OleCmd.CommandText = sb.ToString();
  OleCmd.ExecuteNonQuery();
  Close();
 }
 /// <summary>
 /// 插入數據
 /// </summary>
 private void InsertData(DataTable OutTable)
 {
  OleDbCommand OleCmd = new OleDbCommand();
  OleDbParameter[] parm=new OleDbParameter[OutTable.Columns.Count];
  StringBuilder sb = new StringBuilder();
  sb.Append("insert into Sheet1 values(");
  for(int i=0;i<OutTable.Columns.Count;i++)
  {
  parm=new OleDbParameter("@P"+OutTable.Columns.ColumnName,OleDbType.VarChar);
  sb.Append("@P"+OutTable.Columns.ColumnName+",");
  OleCmd.Parameters.Add(parm);
  }
  sb.Remove(sb.Length-1,1);
  sb.Append(")");
  Open();
  OleCmd.Connection = Conn;
  OleCmd.CommandText = sb.ToString();
  foreach(DataRow row in OutTable.Rows)
  {
  for(int i=0;i<OutTable.Columns.Count;i++)
  {
   parm.Value = row[OutTable.Columns.ColumnName].ToString().Trim();
  }
  OleCmd.ExecuteNonQuery();
  }
  Close();
 }
 /// <summary>
 /// 從Excel輸出數據到數據集
 /// </summary>
 /// <returns></returns>
 public DataSet OutPortData()
 {
  DataSet ds = new DataSet();
  Open();
  OleDbDataAdapter myAdapter = new OleDbDataAdapter("select * from [Sheet1$]", Conn);
  myAdapter.Fill(ds,"Input");
  Close();
  return ds;
 }
 }
}