private staticstring connStr = @"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";

 privatestatic stringconnStr =@"Provider = Microsoft.Jet.OLEDB.4.0;DataSource = d:\login.mdb";
          2007版本的Access數(shù)據(jù)庫鏈接字符串：privatestaticstring connStr =@"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";

OleDbConnection tempconn =new OleDbConnection(connStr);

 OleDbCommand cmd = new OleDbCommand(sql, tempconn); 
      tempconn.Open();
      cmd.ExecuteNonQuery();

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Windows.Forms;
using System.Data;
namespace test
{
  class AccessHelper
  {
    private static string connStr = @"Provider = Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";
    public static OleDbConnection GetConn()
    {
      OleDbConnection tempconn = new OleDbConnection(connStr);
      MessageBox.Show(tempconn.DataSource);
      tempconn.Open();
      MessageBox.Show(tempconn.State.ToString());
      return (tempconn);
    }
    /// <summary>
    /// 執(zhí)行增加、刪除、修改指令
    /// </summary>
    /// <param name="sql">增加、刪除、修改的sql語句</param>
    /// <param name="param">sql語句的參數(shù)</param>
    /// <returns></returns>
    public static int ExecuteNonQuery(string sql, params OleDbParameter[] param)
    {
      using (OleDbConnection conn = new OleDbConnection(connStr))
      {
        using (OleDbCommand cmd = new OleDbCommand(sql,conn))
        {
          if (param != null)
          {
            cmd.Parameters.AddRange(param);
          }
          conn.Open();
          return(cmd.ExecuteNonQuery());
        }
      }
    }
    /// <summary>
    /// 執(zhí)行查詢指令，獲取返回的首行首列的值
    /// </summary>
    /// <param name="sql">查詢sql語句</param>
    /// <param name="param">sql語句的參數(shù)</param>
    /// <returns></returns>
    public static object ExecuteScalar(string sql, params OleDbParameter[] param)
    {
      using (OleDbConnection conn = new OleDbConnection(connStr))
      {
        using (OleDbCommand cmd = new OleDbCommand(sql, conn))
        {
          if (param != null)
          {
            cmd.Parameters.AddRange(param);
          }
          conn.Open();
          return (cmd.ExecuteScalar());
        }
      }
    }
    /// <summary>
    /// 執(zhí)行查詢指令，獲取返回的datareader
    /// </summary>
    /// <param name="sql">查詢sql語句</param>
    /// <param name="param">sql語句的參數(shù)</param>
    /// <returns></returns>
    public static OleDbDataReader ExecuteReader(string sql, params OleDbParameter[] param)
    {
      OleDbConnection conn = new OleDbConnection(connStr);
      OleDbCommand cmd = conn.CreateCommand();
      cmd.CommandText = sql;
      cmd.CommandType = CommandType.Text;
      if (param != null)
      {
        cmd.Parameters.AddRange(param);
      }
      conn.Open();
      return (cmd.ExecuteReader(CommandBehavior.CloseConnection));
    }
    /// <summary>
    /// 執(zhí)行查詢指令，獲取返回datatable
    /// </summary>
    /// <param name="sql">查詢sql語句</param>
    /// <param name="param">sql語句的參數(shù)</param>
    /// <returns></returns>
    public static DataTable ExecuteDatable(string sql, params OleDbParameter[] param)
    {
      using (OleDbConnection conn = new OleDbConnection(connStr))
      {
        using (OleDbCommand cmd = new OleDbCommand(sql, conn))
        {
          if (param != null)
          {
            cmd.Parameters.AddRange(param);
          }
          DataTable dt = new DataTable();
          OleDbDataAdapter sda = new OleDbDataAdapter(cmd);
          sda.Fill(dt);
          return (dt);
        }
      }
    }
  }
}