asp.net数据库连接类

1.连接sqlserver数据库

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;

namespace zz
{
 /// <summary>
 /// ClassConn 的摘要说明。
 /// </summary>
 public class conn       //数据库连接类
 {
  public conn()
  {
   //
   // TODO: 在此处添加构造函数逻辑
   //
  }
  public SqlConnection connstr;   //连接字符串
  public string getconnstr()    //获取连接字符串
  {
   string constr;
   constr=System.Configuration.ConfigurationSettings.AppSettings["connstring"];
   return constr;
  }
  public void open()      //打开数据库
  {
   string constr;
   constr=getconnstr();
   connstr=new SqlConnection(constr);
   connstr.Open();
  }
  public void close()      //关闭数据库
  {
   connstr.Dispose();
   connstr.Close();
  }
  public void execsql(string sql)   //执行sql语句
  {
   open();
   SqlCommand cmd=new SqlCommand(sql,connstr);
   cmd.ExecuteNonQuery();
   close();
  }
  public DataSet dataset(string sql)  //返回DataSet对象
  {
   open();
   SqlDataAdapter rs=new SqlDataAdapter(sql,connstr);
   DataSet ds=new DataSet();
   rs.Fill(ds);
   return ds;
  }
  public DataView dataview(string sql) //返回DataView对象
  {
   DataSet ds=new DataSet();
   ds=dataset(sql);
   DataView dv=new DataView(ds.Tables[0]);
   return dv;
  }
  public SqlDataReader datareader(string sql) //返回DataReader对象
  {
   open();
   SqlCommand cmd=new SqlCommand(sql,connstr);
   SqlDataReader dr=cmd.ExecuteReader();
   return dr;
  }
 }
}

2.连接oledb数据库

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace xyl
{
 /// <summary>
 /// ClassConn 的摘要说明。
 /// </summary>
 public class ClassConn
 {
  public ClassConn()
  {
   //
   // TODO: 在此处添加构造函数逻辑
   //
  }
  public OleDbConnection connstr;
  public string getconnstr()
  {
   string constr;
   constr="Provider=Microsoft.Jet.OleDb.4.0;Data Source="+HttpRuntime.AppDomainAppPath+ System.Configuration.ConfigurationSettings.AppSettings["connstring"];
   return constr;
  }
  public void OpenDB()
  {
   string constr;
   constr=getconnstr();
   connstr=new OleDbConnection(constr);
   connstr.Open();
  }
  public void CloseDB()
  {
   connstr.Dispose();
   connstr.Close();
  }
  public void execsql(string sql)
  {
   OpenDB();
   OleDbCommand cmd=new OleDbCommand(sql,connstr);
   cmd.ExecuteNonQuery();
   CloseDB();
  }
  public DataSet DataSets(string sql)
  {
   OpenDB();
   OleDbDataAdapter rs=new OleDbDataAdapter(sql,connstr);
   DataSet ds=new DataSet();
   rs.Fill(ds);
   return ds;
  }
  public DataView DataViews(string sql)
  {
   DataSet ds=new DataSet();
   ds=DataSets(sql);
   DataView dv=new DataView(ds.Tables[0]);
   return dv;
  }
  public OleDbDataReader MyDataReader(string sql)
  {
   OpenDB();
   OleDbCommand myCom=new OleDbCommand(sql,connstr);
   OleDbDataReader myreader=myCom.ExecuteReader();
   return myreader;
  }
 }
}