C#操作Access类

using System;   
using System.Data;   
using System.Data.OleDb;   
   
namespace AccessDb   
{   
    /**//// <summary>   
    /// AccessDb 的摘要说明，以下信息请完整保留   
    /// 请在数据传递完毕后调用Close()方法，关闭数据链接。   
    /// </summary>   
    public class AccessDbClass   
    {   
   
        变量声明处#region 变量声明处   
        public OleDbConnection Conn;   
        public string ConnString;//连接字符串  
        #endregion   
   
   
        构造函数与连接关闭数据库#region 构造函数与连接关闭数据库   
        /**//// <summary>   
        /// 构造函数   
        /// </summary>   
        /// <param name="Dbpath">ACCESS数据库路径</param>   
        public AccessDbClass(string Dbpath)   
        {   
            ConnString = "Provider=Microsoft.Jet.OleDb.4.0;Data Source=";   
            ConnString += Dbpath;   
            Conn = new OleDbConnection(ConnString);   
            Conn.Open();   
        }   
   
        /**//// <summary>   
        /// 打开数据源链接   
        /// </summary>   
        /// <returns></returns>   
        public OleDbConnection DbConn()   
        {   
            Conn.Open();   
            return Conn;   
        }   
   
        /**//// <summary>   
        /// 请在数据传递完毕后调用该函数，关闭数据链接。   
        /// </summary>   
        public void Close()   
        {   
            Conn.Close();   
        }  
        #endregion   
   
   
        数据库基本操作#region 数据库基本操作   
        /**//// <summary>   
        /// 根据SQL命令返回数据DataTable数据表,   
        /// 可直接作为dataGridView的数据源   
        /// </summary>   
        /// <param name="SQL"></param>   
        /// <returns></returns>   
        public DataTable SelectToDataTable(string SQL)   
        {   
            OleDbDataAdapter adapter = new OleDbDataAdapter();   
            OleDbCommand command = new OleDbCommand(SQL, Conn);   
            adapter.SelectCommand = command;   
            DataTable Dt = new DataTable();   
            adapter.Fill(Dt);      
            return Dt;   
        }   
   
        /**//// <summary>   
        /// 根据SQL命令返回数据DataSet数据集，其中的表可直接作为dataGridView的数据源。   
        /// </summary>   
        /// <param name="SQL"></param>   
        /// <param name="subtableName">在返回的数据集中所添加的表的名称</param>   
        /// <returns></returns>   
        public DataSet SelectToDataSet(string SQL, string subtableName)   
        {   
            OleDbDataAdapter adapter = new OleDbDataAdapter();   
            OleDbCommand command = new OleDbCommand(SQL, Conn);   
            adapter.SelectCommand = command;   
            DataSet Ds = new DataSet();   
            Ds.Tables.Add(subtableName);   
            adapter.Fill(Ds, subtableName);   
            return Ds;   
        }   
   
        /**//// <summary>   
        /// 在指定的数据集中添加带有指定名称的表，由于存在覆盖已有名称表的危险，返回操作之前的数据集。   
        /// </summary>   
        /// <param name="SQL"></param>   
        /// <param name="subtableName">添加的表名</param>   
        /// <param name="DataSetName">被添加的数据集名</param>   
        /// <returns></returns>   
        public DataSet SelectToDataSet (string SQL, string subtableName, DataSet DataSetName)   
        {   
            OleDbDataAdapter adapter = new OleDbDataAdapter();   
            OleDbCommand command = new OleDbCommand(SQL, Conn);   
            adapter.SelectCommand = command;   
            DataTable Dt = new DataTable();   
            DataSet Ds = new DataSet();   
            Ds = DataSetName;   
            adapter.Fill(DataSetName, subtableName);   
            return Ds;   
        }   
   
        /**//// <summary>   
        /// 根据SQL命令返回OleDbDataAdapter，   
        /// 使用前请在主程序中添加命名空间System.Data.OleDb   
        /// </summary>   
        /// <param name="SQL"></param>   
        /// <returns></returns>   
        public OleDbDataAdapter SelectToOleDbDataAdapter(string SQL)   
        {   
            OleDbDataAdapter adapter = new OleDbDataAdapter();   
            OleDbCommand command = new OleDbCommand(SQL, Conn);   
            adapter.SelectCommand = command;   
            return adapter;   
        }   
   
        /**//// <summary>   
        /// 执行SQL命令，不需要返回数据的修改，删除可以使用本函数   
        /// </summary>   
        /// <param name="SQL"></param>   
        /// <returns></returns>   
        public bool ExecuteSQLNonquery(string SQL)   
        {   
            OleDbCommand cmd = new OleDbCommand(SQL, Conn);   
            try 
            {   
                cmd.ExecuteNonQuery();   
                return true;   
            }   
            catch 
            {   
                return false;   
            }   
        }  
        #endregion   
    }   
}