Access 通用数据访问类(asp.net 2.0 c#)

using System;


using System.Data;


using System.Configuration;


using System.Web;


using System.Web.Security;


using System.Web.UI;


using System.Web.UI.WebControls;


using System.Web.UI.WebControls.WebParts;


using System.Web.UI.HtmlControls;


using System.Data.OleDb;








/**//// <summary>


/// DataAccess 的摘要说明


/// </summary>


public class DataAccess




...{


protected static OleDbConnection conn = new OleDbConnection();


protected static OleDbCommand comm = new OleDbCommand();


public DataAccess()




...{


//init


}


private static void openConnection()




...{


if (conn.State == ConnectionState.Closed)




...{


conn.ConnectionString = @"Provider=Microsoft.Jet.OleDb.4.0;Data Source="+ConfigurationManager.AppSettings["myconn"];//web.config文件里设定。


comm.Connection = conn;


try




...{


conn.Open();


}


catch (Exception e)




...{ throw new Exception(e.Message); }




}




}//打开数据库




private static void closeConnection()




...{


if (conn.State == ConnectionState.Open)




...{


conn.Close();


conn.Dispose();


comm.Dispose();


}


}//关闭数据库




public static void excuteSql(string sqlstr)




...{


try




...{


openConnection();


comm.CommandType = CommandType.Text;


comm.CommandText = sqlstr;


comm.ExecuteNonQuery();


}


catch (Exception e)




...{


throw new Exception(e.Message);


}


finally




...{ closeConnection(); }


}//执行sql语句




public static OleDbDataReader dataReader(string sqlstr)




...{


OleDbDataReader dr = null;


try




...{


openConnection();


comm.CommandText = sqlstr;


comm.CommandType = CommandType.Text;




dr = comm.ExecuteReader(CommandBehavior.CloseConnection);


}


catch




...{


try




...{


dr.Close();


closeConnection();


}




catch ...{ }


}


return dr;


}//返回指定sql语句的OleDbDataReader对象，使用时请注意关闭这个对象。


public static void dataReader(string sqlstr, ref OleDbDataReader dr)




...{


try




...{


openConnection();


comm.CommandText = sqlstr;


comm.CommandType = CommandType.Text;


dr=comm.ExecuteReader(CommandBehavior.CloseConnection);


}


catch




...{


try




...{


if (dr != null && !dr.IsClosed)


dr.Close();


}


catch




...{


}


finally




...{


closeConnection();


}


}


}//返回指定sql语句的OleDbDataReader对象,使用时请注意关闭




public static DataSet dataSet(string sqlstr)




...{


DataSet ds = new DataSet();


OleDbDataAdapter da = new OleDbDataAdapter();


try




...{


openConnection();


comm.CommandType = CommandType.Text;


comm.CommandText = sqlstr;


da.SelectCommand = comm;


da.Fill(ds);




}


catch (Exception e)




...{


throw new Exception(e.Message);


}


finally




...{


closeConnection();


}


return ds;


}//返回指定sql语句的dataset




public static void dataSet(string sqlstr, ref DataSet ds)




...{


OleDbDataAdapter da = new OleDbDataAdapter();


try




...{


openConnection();


comm.CommandType = CommandType.Text;


comm.CommandText = sqlstr;


da.SelectCommand = comm;


da.Fill(ds);


}


catch (Exception e)




...{


throw new Exception(e.Message);


}


finally




...{


closeConnection();


}


}//返回指定sql语句的dataset




public static DataTable dataTable(string sqlstr)




...{


DataTable dt = new DataTable();


OleDbDataAdapter da = new OleDbDataAdapter();


try




...{


openConnection();


comm.CommandType = CommandType.Text;


comm.CommandText = sqlstr;


da.SelectCommand = comm;


da.Fill(dt);


}


catch (Exception e)




...{


throw new Exception(e.Message);


}


finally




...{


closeConnection();


}


return dt;


}//返回指定sql语句的datatable


public static void dataTable(string sqlstr, ref DataTable dt)




...{


OleDbDataAdapter da = new OleDbDataAdapter();


try




...{


openConnection();


comm.CommandType = CommandType.Text;


comm.CommandText = sqlstr;


da.SelectCommand = comm;


da.Fill(dt);


}


catch (Exception e)




...{


throw new Exception(e.Message);


}


finally




...{


closeConnection();


}


}//返回指定sql语句的datatable




public static DataView dataView(string sqlstr)




...{


OleDbDataAdapter da = new OleDbDataAdapter();


DataView dv = new DataView();


DataSet ds = new DataSet();


try




...{


openConnection();


comm.CommandType = CommandType.Text;


comm.CommandText = sqlstr;


da.SelectCommand = comm;


da.Fill(ds);


dv = ds.Tables[0].DefaultView;


}


catch (Exception e)




...{


throw new Exception(e.Message);


}


finally




...{


closeConnection();


}


return dv;


}


//返回指定sql语句的dataview




}