http://www.leadbbs.com/MINI/Default.asp?205-2758725-0-0-0-0-0-a-.htm
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.OleDb;
using System.Web;
namespace DAL
{
public class db
{
/// <summary>
/// 获得连接对象
/// </summary>
/// <returns></returns>
public static OleDbConnection GetOleDbConnection()
{
return new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + System.Web.HttpContext.Current.Server.MapPath(System.Configuration.ConfigurationManager.AppSettings["db"].ToString()));
}
private static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, string cmdText, params object[] p)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Parameters.Clear();
cmd.Connection = conn;
cmd.CommandText = cmdText;
cmd.CommandType = CommandType.Text;
cmd.CommandTimeout = 30;
if (p != null)
{
foreach (object parm in p)
cmd.Parameters.AddWithValue(string.Empty, parm);
}
}
public static DataSet ExecuteDataset(string cmdText, params object[] p)
{
DataSet ds = new DataSet();
OleDbCommand command = new OleDbCommand();
using (OleDbConnection connection = GetOleDbConnection())
{
PrepareCommand(command, connection, cmdText, p);
OleDbDataAdapter da = new OleDbDataAdapter(command);
da.Fill(ds);
}
return ds;
}
public static DataRow ExecuteDataRow(string cmdText, params object[] p)
{
DataSet ds = ExecuteDataset(cmdText, p);
if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
return ds.Tables[0].Rows[0];
return null;
}
/// <summary>
/// 返回受影响的行数
/// </summary>
/// <param name="cmdText">a</param>
/// <param name="commandParameters">传入的参数</param>
/// <returns></returns>
public static int ExecuteNonQuery(string cmdText, params object[] p)
{
OleDbCommand command = new OleDbCommand();
using (OleDbConnection connection = GetOleDbConnection())
{
PrepareCommand(command, connection, cmdText, p);
return command.ExecuteNonQuery();
}
}
iuhxq,2008-08-10 16:47:45
/// <summary>
/// 返回SqlDataReader对象
/// </summary>
/// <param name="cmdText"></param>
/// <param name="commandParameters">传入的参数</param>
/// <returns></returns>
public static OleDbDataReader ExecuteReader(string cmdText, params object[] p)
{
OleDbCommand command = new OleDbCommand();
OleDbConnection connection = GetOleDbConnection();
try
{
PrepareCommand(command, connection, cmdText, p);
OleDbDataReader reader = command.ExecuteReader(CommandBehavior.CloseConnection);
return reader;
}
catch
{
connection.Close();
throw;
}
}
/// <summary>
/// 返回结果集中的第一行第一列,忽略其他行或列
/// </summary>
/// <param name="cmdText"></param>
/// <param name="commandParameters">传入的参数</param>
/// <returns></returns>
public static object ExecuteScalar(string cmdText, params object[] p)
{
OleDbCommand cmd = new OleDbCommand();
using (OleDbConnection connection = GetOleDbConnection())
{
PrepareCommand(cmd, connection, cmdText, p);
return cmd.ExecuteScalar();
}
}
/// <summary>
/// 分页
/// </summary>
/// <param name="recordCount"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <param name="cmdText"></param>
/// <param name="countText"></param>
/// <param name="p"></param>
/// <returns></returns>
public static DataSet ExecutePager(ref int recordCount, int pageIndex, int pageSize, string cmdText, string countText, params object[] p)
{
if (recordCount < 0)
recordCount = int.Parse(ExecuteScalar(countText, p).ToString());
DataSet ds = new DataSet();
OleDbCommand command = new OleDbCommand();
using (OleDbConnection connection = GetOleDbConnection())
{
PrepareCommand(command, connection, cmdText, p);
OleDbDataAdapter da = new OleDbDataAdapter(command);
da.Fill(ds, (pageIndex - 1) * pageSize, pageSize, "result");
}
return ds;
}
}
}