AspNet连接Access和SqlSever

<connectionStrings>
    <!--*****************SqlServer连接设置*****************-->
    <add name="DbHelperProvider" connectionString="System.Data.SqlClient"/>
    <!--SqlServer验证-->
    <add name="DbHelperConnectionString" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=AdventureWorks;User ID=sa;Password=sa"
      providerName="System.Data.SqlClient" />
    <!--Windows验证-->
    <add name="DbHelperConnectionString" connectionString="Data Source=localhost;Initial Catalog=AdventureWorks;Integrated Security=True"
      providerName="System.Data.SqlClient" />
    
    <!--*****************Access连接设置*****************-->
    <add name="DbHelperProvider" connectionString="System.Data.OleDb"/>
    <add name="access_con" connectionString="Provider= Microsoft.Jet.Oledb.4.0;Jet OleDb:DataBase Password=sa;Data Source="/>
    <add name="access_path" connectionString="~/App_Data/DB.mdb"/>
  </connectionStrings>

using System;
using System.Data;
using System.Data.Common;
using System.Configuration;


public class DbHelper
{    //SqlServer
    private static string dbProviderName = ConfigurationManager.ConnectionStrings["DbHelperProvider"].ConnectionString;
    private static string dbConnectionString = ConfigurationManager.ConnectionStrings["DbHelperConnectionString"].ConnectionString;    ////Access
    //private static string dbProviderName = ConfigurationManager.ConnectionStrings["DbHelperProvider"].ToString();
    //private static string dbConnectionString = ConfigurationManager.ConnectionStrings["access_con"].ConnectionString 
        + System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.ConnectionStrings["access_path"].ConnectionString);

        private DbConnection connection;
    public DbHelper()
    {
        this.connection = CreateConnection(DbHelper.dbConnectionString);
    }
    public DbHelper(string connectionString)
    {
        this.connection = CreateConnection(connectionString);
    }

    public static DbConnection CreateConnection()
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbConnection dbconn = dbfactory.CreateConnection();
        dbconn.ConnectionString = DbHelper.dbConnectionString;
        return dbconn;
    }

    public static DbConnection CreateConnection(string connectionString)
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbConnection dbconn = dbfactory.CreateConnection();
        dbconn.ConnectionString = connectionString;
        return dbconn;
    }

    public DbCommand GetStoredProcCommond(string storedProcedure)
    {
        DbCommand dbCommand = connection.CreateCommand();
        dbCommand.CommandText = storedProcedure;
        dbCommand.CommandType = CommandType.StoredProcedure;
        return dbCommand;
    }

    public DbCommand GetSqlStringCommond(string sqlQuery)
    {
        DbCommand dbCommand = connection.CreateCommand();
        dbCommand.CommandText = sqlQuery;
        dbCommand.CommandType = CommandType.Text;
        return dbCommand;
    }

    #region 增加参数
    public void AddParameterCollection(DbCommand cmd, DbParameterCollection dbParameterCollection)
    {
        foreach (DbParameter dbParameter in dbParameterCollection)
        {
            cmd.Parameters.Add(dbParameter);
        }
    }

    public void AddOutParameter(DbCommand cmd, string parameterName, DbType dbType, int size)
    {
        DbParameter dbParameter = cmd.CreateParameter();
        dbParameter.DbType = dbType;
        dbParameter.ParameterName = parameterName;
        dbParameter.Size = size;
        dbParameter.Direction = ParameterDirection.Output;
        cmd.Parameters.Add(dbParameter);
    }

    public void AddInParameter(DbCommand cmd, string parameterName, DbType dbType, object value)
    {
        DbParameter dbParameter = cmd.CreateParameter();
        dbParameter.DbType = dbType;
        dbParameter.ParameterName = parameterName;
        dbParameter.Value = value;
        dbParameter.Direction = ParameterDirection.Input;
        cmd.Parameters.Add(dbParameter);
    }

    public void AddReturnParameter(DbCommand cmd, string parameterName, DbType dbType)
    {
        DbParameter dbParameter = cmd.CreateParameter();
        dbParameter.DbType = dbType;
        dbParameter.ParameterName = parameterName;
        dbParameter.Direction = ParameterDirection.ReturnValue;
        cmd.Parameters.Add(dbParameter);
    }

    public DbParameter GetParameter(DbCommand cmd, string parameterName)
    {
        return cmd.Parameters[parameterName];
    }
    #endregion

    #region 执行
    public DataSet ExecuteDataSet(DbCommand cmd)
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataSet ds = new DataSet();
        dbDataAdapter.Fill(ds);
        return ds;
    }

    public DataTable ExecuteDataTable(DbCommand cmd)
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataTable dataTable = new DataTable();
        dbDataAdapter.Fill(dataTable);
        return dataTable;
    }

    public DbDataReader ExecuteReader(DbCommand cmd)
    {
        cmd.Connection.Open();
        DbDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        return reader;
    }

    public int ExecuteNonQuery(DbCommand cmd)
    {
        cmd.Connection.Open();
        int ret = cmd.ExecuteNonQuery();
        cmd.Connection.Close();
        return ret;
    }

    public object ExecuteScalar(DbCommand cmd)
    {
        cmd.Connection.Open();
        object ret = cmd.ExecuteScalar();
        cmd.Connection.Close();
        return ret;
    }
    #endregion

    #region 执行事务
    public DataSet ExecuteDataSet(DbCommand cmd, Trans t)
    {
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataSet ds = new DataSet();
        dbDataAdapter.Fill(ds);
        return ds;
    }

    public DataTable ExecuteDataTable(DbCommand cmd, Trans t)
    {
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataTable dataTable = new DataTable();
        dbDataAdapter.Fill(dataTable);
        return dataTable;
    }

    public DbDataReader ExecuteReader(DbCommand cmd, Trans t)
    {
        cmd.Connection.Close();
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        DbDataReader reader = cmd.ExecuteReader();
        DataTable dt = new DataTable();
        return reader;
    }

    public int ExecuteNonQuery(DbCommand cmd, Trans t)
    {
        cmd.Connection.Close();
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        int ret = cmd.ExecuteNonQuery();
        return ret;
    }

    public object ExecuteScalar(DbCommand cmd, Trans t)
    {
        cmd.Connection.Close();
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        object ret = cmd.ExecuteScalar();
        return ret;
    }
    #endregion
}

public class Trans : IDisposable
{
    private DbConnection conn;
    private DbTransaction dbTrans;

    public DbConnection DbConnection
    {
        get { return this.conn; }
    }

    public DbTransaction DbTrans
    {
        get { return this.dbTrans; }
    }

    public Trans()
    {
        conn = DbHelper.CreateConnection();
        conn.Open();
        dbTrans = conn.BeginTransaction();
    }

    public Trans(string connectionString)
    {
        conn = DbHelper.CreateConnection(connectionString);
        conn.Open();
        dbTrans = conn.BeginTransaction();
    }

    public void Commit()
    {
        dbTrans.Commit();
        this.Colse();
    }

    public void RollBack()
    {
        dbTrans.Rollback();
        this.Colse();
    }

    public void Dispose()
    {
        this.Colse();
    }

    public void Colse()
    {
        if (conn.State == System.Data.ConnectionState.Open)
        {
            conn.Close();
        }
    }

}