仿照以前收集的一個經典SQL Server數據訪問類，稍做修改。
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 的摘要說明
/// </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文件裡設定。
comm.Connection = conn;
try
{
conn.Open();
}
catch (Exception e)
{ throw new Exception(e.Message); }
}
}//打開數據庫
private static void closeConnection()
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
conn.Dispose();
comm.Dispose();
}
}//關閉數據庫
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(); }
}//執行sql語句
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語句的OleDbDataReader對象，使用時請注意關閉這個對象。
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語句的OleDbDataReader對象,使用時請注意關閉
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語句的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語句的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語句的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語句的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語句的datavIEw
}
出處：http://enuosky.cnblogs.com/archive/2006/05/15/400879.Html
