如何使用.net访问Access数据库

前言：今天整理程序，看到之前写的一个Demo，也不知道是从哪里参考的了，写到这里，留作备用吧。

使用.net访问Access数据库：
1.BL层：新增一个DataAccess类。

Code
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;

namespace Haley.FrameWork
{

    /**//// <summary>
    /// DataAccess 的摘要说明
    /// </summary>
    public class DataAccess
    {
        protected static OleDbConnection conn = new OleDbConnection();
        protected static OleDbCommand comm = new OleDbCommand();
        public DataAccess()
        {
            //init
        }

        /**//// <summary>
        /// 打开数据库
        /// </summary>
        private static void openConnection()
        {
            if (conn.State == ConnectionState.Closed)
            {
                conn.ConnectionString = @"Provider=Microsoft.Jet.OleDb.4.0;Data Source=" + ConfigurationManager.AppSettings["myconn"];//web.config文件里设定。             
                comm.Connection = conn;
                try
                {
                    conn.Open();
                }
                catch (Exception e)
                { throw new Exception(e.Message); }

            }

        }

        /**//// <summary>
        /// 关闭数据库
        /// </summary>
        private static void closeConnection()
        {
            if (conn.State == ConnectionState.Open)
            {
                conn.Close();
                conn.Dispose();
                comm.Dispose();
            }
        }

        /**//// <summary>
        /// 执行sql语句
        /// </summary>
        /// <param name="sqlstr"></param>
        public static void excuteSql(string sqlstr)
        {
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                comm.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            { closeConnection(); }
        }

        /**//// <summary>
        /// 返回指定sql语句的OleDbDataReader对象，使用时请注意关闭这个对象。
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <returns></returns>
        public static OleDbDataReader dataReader(string sqlstr)
        {
            OleDbDataReader dr = null;
            try
            {
                openConnection();
                comm.CommandText = sqlstr;
                comm.CommandType = CommandType.Text;

                dr = comm.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch
            {
                try
                {
                    dr.Close();
                    closeConnection();
                }
                catch { }
            }
            return dr;
        }

        /**//// <summary>
        /// 返回指定sql语句的OleDbDataReader对象,使用时请注意关闭
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <param name="dr"></param>
        public static void dataReader(string sqlstr, ref OleDbDataReader dr)
        {
            try
            {
                openConnection();
                comm.CommandText = sqlstr;
                comm.CommandType = CommandType.Text;
                dr = comm.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch
            {
                try
                {
                    if (dr != null && !dr.IsClosed)
                        dr.Close();
                }
                catch
                {
                }
                finally
                {
                    closeConnection();
                }
            }
        }

        /**//// <summary>
        /// 返回指定sql语句的dataset
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <returns></returns>
        public static DataSet dataSet(string sqlstr)
        {
            DataSet ds = new DataSet();
            OleDbDataAdapter da = new OleDbDataAdapter();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(ds);

            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
            return ds;
        }

        /**//// <summary>
        /// 返回指定sql语句的dataset
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <param name="ds"></param>
        public static void dataSet(string sqlstr, ref DataSet ds)
        {
            OleDbDataAdapter da = new OleDbDataAdapter();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(ds);
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
        }

        /**//// <summary>
        /// 返回指定sql语句的datatable
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <returns></returns>
        public static DataTable dataTable(string sqlstr)
        {
            DataTable dt = new DataTable();
            OleDbDataAdapter da = new OleDbDataAdapter();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(dt);
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
            return dt;
        }

        /**//// <summary>
        /// 返回指定sql语句的datatable
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <param name="dt"></param>
        public static void dataTable(string sqlstr, ref DataTable dt)
        {
            OleDbDataAdapter da = new OleDbDataAdapter();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(dt);
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
        }

        /**//// <summary>
        /// 返回指定sql语句的dataview
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <returns></returns>
        public static DataView dataView(string sqlstr)
        {
            OleDbDataAdapter da = new OleDbDataAdapter();
            DataView dv = new DataView();
            DataSet ds = new DataSet();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(ds);
                dv = ds.Tables[0].DefaultView;
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
            return dv;
        }
        

    }
}

2.Web.Config：
在Config文件中添加Access文件的路径：

<appSettings>
        <!-- 这里是存放Access文件的地址。用Access文件存放的路径替换下边的路径。-->
        <add key="myconn" value="D:\Test\Test.mdb"/>        
    </appSettings >

3.UI层。
在页面添加控件，在cs文件中使用上边的类。

    protected void Button1_Click(object sender, EventArgs e)
    {
        string name = TextBox1.Text;
        string strSql = "insert into Table1(Name) values('" + name + "')";
        DataAccess.excuteSql(strSql);
    }