ASP.NET调用类连接Access数据库执行sql语句并以GridView方式读取表中数据

    上篇文章是通过页面直接访问数据库,这篇是通过调用一个通用的AccessDb类来实现对数据的操作,这样可以节省以后的工作量,创建的类需要放在App_Code文件夹下(创建类时vs2005会提示)

新建类AccessDB

    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;
/// <summary>
/// AccessDB 的摘要说明
/// </summary>
public class AccessDB
{

    //变量声明处#region 变量声明处
    public OleDbConnection Conn;
    public string ConnString;//连接字符串

 public AccessDB()
 {
        //ConnString = ConfigurationManager.ConnectionStrings["DB"].ConnectionString + System.AppDomain.CurrentDomain.BaseDirectory + ConfigurationManager.ConnectionStrings["DBpath"].ConnectionString;
        string datapath = "DataBase/SampleDatabase.mdb";
        string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;Data Source= ";
        strConnection += System.Web.HttpContext.Current.Server.MapPath(datapath);
        ConnString = strConnection;
        Conn = new OleDbConnection(ConnString);
        Conn.Open();
 }

   
    //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-webconfig中自定义</param>
    public AccessDB(string DBpath)
    {
        //ConnString = ConfigurationManager.ConnectionStrings["DB"].ConnectionString + System.AppDomain.CurrentDomain.BaseDirectory + ConfigurationManager.ConnectionStrings["DBpath"].ConnectionString;
        string datapath = "DataBase/SampleDatabase.mdb";
        string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;Data Source= ";
        strConnection += System.Web.HttpContext.Current.Server.MapPath(datapath);
        Conn = new OleDbConnection(strConnection);
        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();
    }

    /// 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;
        }
    }

    /// <summary>
    /// 执行SQL命令，数据是否存在，返回bool
    /// </summary>
    /// <param name="SQL"></param>
    /// <returns></returns>
    public bool Exists(string SQL)
    {
        OleDbCommand cmd = new OleDbCommand(SQL, Conn);
        int count = Convert.ToInt32(cmd.ExecuteScalar());
        if (count > 0)
        {
            return true;
        }
        else
        {
            return false;<
4000
br />        }
    }

    /// <summary>
    /// 执行SQL命令，查询记录总数，返回int
    /// </summary>
    /// <param name="SQL"></param>
    /// <returns></returns>
    public int MaxCount(string SQL)
    {
        OleDbCommand cmd = new OleDbCommand(SQL, Conn);
        int count = Convert.ToInt32(cmd.ExecuteScalar());
        if (count > 0)
        {
            return count;
        }
        else
        {
            return 0;
        }
    }

}

这是摘自网上一个朋友写的类,做了一些修改

在写一个页面AccessData,源码如下:

 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AccessData.aspx.cs" Inherits="AccessData" %>

<%@Import Namespace="System.Data"%>
<%@Import Namespace="System.Data.SqlClient"%>
<%@Import Namespace="System.Data.OleDb"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<script runat="server">
   
    protected void Page_Load(object sender, EventArgs e)
    {
       

        DataSet accessdata = new DataSet();
       

       //调用类连接数据库
        AccessDB accessdb = new AccessDB();

        

        //执行语句

        string insertsql = "insert into zbinfo values (1,1,1,1)";
        accessdb.ExecuteSQLNonquery(insertsql);
       
       
        //GridView方式读取数据
        string str = "select * from zbinfo";
        accessdb.SelectToDataSet(str, "zbinfo", accessdata);
        this.GridView1.DataSource = accessdata.Tables["zbinfo"].DefaultView;
        this.GridView1.DataBind();
               
    }

</script>

 

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>监控对象位置</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="监控对象:"></asp:Label>
        <asp:Label ID="zbid" runat="server" Text="Label"></asp:Label>
        <br />
        <br />
        <br />
        <asp:Label ID="Label3" runat="server" Text="坐标信息:"></asp:Label>
        <asp:Label ID="zbinfo" runat="server" Text="Label"></asp:Label>
        <asp:Label ID="Label_count" runat="server" Text="Label"></asp:Label><br />
        <br />
        <br />
        <asp:GridView ID="GridView1" runat="server">
        </asp:GridView>
        <br />
        <br />
         <asp:DataList ID="DataList1" runat="server">
        </asp:DataList><br />
        <asp:TextBox ID="TextBox1" runat="server" Height="46px" Width="316px"></asp:TextBox></div>
    </form>
</body>
</html>