C#操作Access之读取mdb

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转载来自http://blog.csdn.net/chelen_jak/article/details/65629418

using System.Data;  
using System.Data.OleDb;  private class MDBHelp  {  private string _fileName;  private string _connectionString;  private OleDbConnection _odcConnection;  /// <summary>  /// 构建函数  /// </summary>  /// <param name="fileName">MDB文件（含完整路徑）</param>  public MDBHelp(string fileName)  {  this._fileName = fileName;  this._connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + ";";  }  /// <summary>  /// 建立连接（打开数据库文件）  /// </summary>  public void Open()  {  try  {  // 建立连接  this._odcConnection = new OleDbConnection(this._connectionString);  // 打开连接  this._odcConnection.Open();  }  catch (Exception)  {  throw new Exception("嘗試打开 " + this._fileName + " 失敗, 請確認文件是否存在！");  }  }  /// <summary>  /// 断开连接（关闭据库文件）  /// </summary>  public void Close()  {  this._odcConnection.Close();  }  /// <summary>  /// 根据sql命令返回一个DataSet  /// </summary>  /// <param name="sql">sql命令</param>  /// <returns>以DataTable形式返回数据</returns>  public DataSet GetDataSet(string sql)  {  DataSet ds = new DataSet();  try  {  OleDbDataAdapter adapter = new OleDbDataAdapter(sql, this._odcConnection);  adapter.Fill(ds);  }  catch (Exception)  {  throw new Exception("sql語句： " + sql + " 執行失敗！");  }  return ds;  }  }     

调用方法

string mdbFile = "p:\\EvenYYMM.mdb";           //默認路徑  MDBHelp mdbHelp = new MDBHelp(mdbFile);  
try  
{  mdbHelp.Open();     // 打開數據庫  var ds1 = mdbHelp.GetDataSet("select count(*) as n1 from even where id > " + last_id.ToString());  var ds = mdbHelp.GetDataSet("select to 10 * from even where Id >= 100 order by id");  mdbHelp.Close();    // 關閉數據庫  
}  
finally  
{  mdbHelp = null;  
}  

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