如何使用.net访问Access数据库-优快云博客

本文介绍了如何使用.NET框架中的OleDb组件访问Access数据库，并提供了连接配置、执行SQL语句及获取数据集的具体实现方法。

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http://www.cnblogs.com/zhaiqinjiang/archive/2007/12/10/989074.html

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);
    }

访问带密码的Access文件

  <add key="ConnProvider" value="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=|DataDirectory|a.mdb;Jet OleDB:Database Password=123" />

string LinkString = " Provider=Microsoft.Jet.OLEDB.4.0;Data Source=“ + System.Windows.Forms.Application.StartupPath + "\\a.mdb";

ACCESS 2000

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;User Id=admin;Password=;

带密码的

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;Jet OLEDB:Database Password=MyDbPassword;

ACCESS 2007

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccess2007file.accdb;Persist Security Info=False;

带密码的

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccess2007file.accdb;Jet OLEDB:Database Password=MyDbPassword;

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Microsoft Access Database Engine

http://www.microsoft.com/en-in/download/details.aspx?id=13255