.net 连access 封装

using System;
using System.Web;
using System.Web.UI;
using System.Data;
using System.Data.OleDb;

namespace webdb.classes
{
/// <summary>
/// DbAccess 的摘要说明。
/// </summary>
public class DbAccess:Page
{
string ConnString;
OleDbConnection conn ;
OleDbCommand cmd;
public DbAccess(string datapath)
{

ConnString = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+HttpContext.Current.Request.PhysicalApplicationPath.ToString()+"\\"+datapath;
/*if(path.Length<1)
{
ConnString = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+Server.MapPath("data/shuhua.mdb");

}
else
{
ConnString = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+path[0].Trim();
}*/
conn = new OleDbConnection();
conn.ConnectionString=ConnString;
cmd = new OleDbCommand();
cmd.Connection=conn;

}
/// <summary>
/// 获取数据存在DataTable中
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public DataTable GetTable(string sql)
{
cmd.CommandText=sql;
OleDbDataAdapter da = new OleDbDataAdapter();
da.SelectCommand=cmd;
//DataTable dt = new DataTable();
DataSet ds = new DataSet();
da.Fill(ds);
return ds.Tables[0];
}
/// <summary>
/// 获取一个值
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public string GetOne(string sql)
{
string obj="";
conn.Open();
cmd.CommandText=sql;
try
{
obj = Convert.ToString(cmd.ExecuteScalar());
obj = (obj==null)?(""):(obj);

}
catch(Exception ex)
{
HttpContext.Current.Response.Write("<script>alert('"+ex.Message.ToString()+"')</script>");
}
conn.Close();
return obj;
}
public DataSet GetSet(string sql)
{
cmd.CommandText=sql;
OleDbDataAdapter da = new OleDbDataAdapter();
da.SelectCommand=cmd;
//DataTable dt = new DataTable();
DataSet ds = new DataSet();
da.Fill(ds);
return ds;
}
/// <summary>
/// 事物处理
/// </summary>
/// <param name="sqls"></param>
/// <returns></returns>
public bool GetStateTran(params string[] sqls)
{

conn.Open();
OleDbTransaction tran = conn.BeginTransaction();
//tran.
cmd.Transaction=tran;
for(int i=0;i<sqls.Length;i++)
{
try
{
cmd.CommandText=sqls[i];
cmd.ExecuteNonQuery();

}
catch(Exception ex)
{
tran.Rollback();
HttpContext.Current.Response.Write(ex.Message.ToString());
return false;
}
}

tran.Commit();
conn.Close();
return true;
}
public bool GetState(string sql)
{
bool suc = false;
conn.Open();
cmd.CommandText=sql;
try
{
int count = cmd.ExecuteNonQuery();
if(count>0)
suc=true;
}
catch(Exception ex)
{
HttpContext.Current.Response.Write("<script>alert('"+ex.Message.ToString()+"')</script>");
}
conn.Close();
return suc;

}
/*public bool ReturnState(string sql)
{
string String = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+Server.MapPath("data/shuhua.mdb");
OleDbConnection connR = new OleDbConnection();
connR.ConnectionString=String;
OleDbcommand cmdR = new OleDbCommand();
cmdR.Connection=connR;
bool suc = false;
connR.Open();
cmdR.CommandText=sql;
try
{
int count = cmdR.ExecuteNonQuery();
if(count>0)
suc=true;
}
catch(Exception ex)
{
HttpContext.Current.Response.Write("<script>alert('"+ex.Message.ToString()+"')</script>");
}
connR.Close();
return suc;

}*/
//分页
/*public DataTable GetPerData(string sql,int cur)
{
cmd.CommandText=sql;
OleDbDataAdapter da = new OleDbDataAdapter();
da.SelectCommand=cmd;
DataSet ds = new DataSet();
int zon = cur*8;

da.Fill(ds,zon,8,"per");

return ds.Tables["per"];

}
*/
//根据提供的页数分页
public DataTable GetPerData(string sql,int cur,int percount)
{
cmd.CommandText=sql;
OleDbDataAdapter da = new OleDbDataAdapter();
da.SelectCommand=cmd;
DataSet ds = new DataSet();
int zon = cur*percount;

da.Fill(ds,zon,percount,"per");

return ds.Tables["per"];
}

}
}