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要烂熟于胸的代码（1）-ADO.NET数据查询

2016-03-20 08:34 579 查看

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配置部分：

<?xml version="1.0"?>



<configuration>

<appSettings>

    <add key="ConnectionString" value="Data Source=.\SQLEXPRESS;AttachDbFilename=C:\DataBase\db_09.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"/>

</appSettings>

<connectionStrings/>

<system.web>

    

    <compilation debug="true" targetFramework="4.0"/>

    

    <authentication mode="Windows"/>

    

    <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"/>

</system.web>

</configuration>

Default.aspx：

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

    <title>使用Command对象查询数据库中记录</title>

    <style >

    body:{margin-top:0px}

    </style>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <table style=" font-size :9pt">

            <tr>

                <td>

                    请输入姓名：<asp:TextBox ID="txtName" runat="server" Width="78px"></asp:TextBox>

                    <asp:Button ID="btnSelect" runat="server" OnClick="btnSelect_Click" Text="查询" /></td>

            </tr>

            <tr>

                <td>

                    <asp:GridView ID="GridView1" runat="server">

                    </asp:GridView>

                </td>

            </tr>

        </table>



    </div>

    </form>

</body>

</html>

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.SqlClient;

public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            this.bind();

        }

    }

    public SqlConnection GetConnection()

    {

        string myStr = ConfigurationManager.AppSettings["ConnectionString"].ToString();

        SqlConnection myConn = new SqlConnection(myStr);

        return myConn;

    }

    protected void bind()

    {

        SqlConnection myConn = GetConnection();

        myConn.Open();

        string sqlStr = "select * from tb_Student ";

        SqlDataAdapter myDa = new SqlDataAdapter(sqlStr, myConn);

        DataSet myDs = new DataSet();

        myDa.Fill(myDs);

        GridView1.DataSource = myDs;

        GridView1.DataBind();

        myDa.Dispose();

        myDs.Dispose();

        myConn.Close();

    }



    protected void btnSelect_Click(object sender, EventArgs e)

    {

        if (this.txtName.Text != "")

        {

            SqlConnection myConn = GetConnection();

            myConn.Open();

            string sqlStr = "select * from tb_Student where
Name=@Name";

            SqlCommand myCmd = new SqlCommand(sqlStr, myConn);

            myCmd.Parameters.Add("@Name", SqlDbType.VarChar, 20).Value = this.txtName.Text.Trim();

            SqlDataAdapter myDa = new SqlDataAdapter(myCmd);

            DataSet myDs = new DataSet();

            myDa.Fill(myDs);

            if (myDs.Tables[0].Rows.Count > 0)

            {

                GridView1.DataSource = myDs;

                GridView1.DataBind();

            }

            else

            {

                Response.Write("<script>alert('没有相关记录')</script>");

            }

            myDa.Dispose();

            myDs.Dispose();

            myConn.Close();

        }

        else

            this.bind();

    }

}

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