Question

如何使用.net访问Access数据库

Answer 1

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