ASP.Net课堂--期末复习

ASP课堂--期末复习

1、建立网站，以班级+序号+姓名为名字（如“软件工程1班1好张三”）来建立网站。建立数据库test,其中包含stu_info表和goods_info表，stu_info表结构：(Done)

stu_name varchar(20)

stu_pwd varchar(20)

在stu_info表中插入一条记录（”zhang”,”zhang”）

goods_info表结构：

goods_name varchar(50)

goods_price float

goods_date varchar(20)

goods_images varchar(100)

2、新建login.aspx页面，要求在此页面中用户输入用户名和密码，当用户单击“登录“按钮时，判断用户的输入与stu_info表中的数据是否符合，如果不符合，弹出对话框提示”用户名或密码错误“，如果用户输入正确，将用户的用户名保存到Session,并跳转到goodsadmin.aspx页面。(Done)

using System;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Data;

public partial class login : System.Web.UI.Page
{
  
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void LoginBtn_Click(object sender, EventArgs e)
    {
        //连接字符串
        string connStr = "Data Source=.\\SQLEXPRESS;AttachDbFilename=D:\\My Documents\\Test.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
        //获取用户的输入
        string username = tbUserName.Text;
        string password = tbPassword.Text;
        //sql语句，用来查询
        string sqlStr = "select * from stu_info where stu_name='" + username +"'";

        using (SqlConnection conn = new SqlConnection(connStr))
        {
            conn.Open();    //打开数据库连接
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandText = sqlStr;
                DataSet ds = new DataSet();
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                adapter.Fill(ds);
                DataTable table = ds.Tables[0];
                if (table.Rows.Count <= 0)
                {
                    Response.Write(@"<script>alert('用户名不存在！');</script>");
                    return;
                }
                else
                {
                    DataRow rows = table.Rows[0];
                    string dbpassword = (string)rows["stu_pwd"];
                    if (dbpassword == password)
                    {
                        //将用户名保存到Session
                        Session["username"] = (string)rows["stu_name"];
                        Response.Redirect("~/goodsAdmin.aspx");
                    }
                    else
                    {
                        Response.Write(@"<script>alert('密码错误！');</script>");
                        return;
                    }
                }
               
            }
        }

    }
}

3、新建goodsinsert.aspx页面，首先判断用户是否已经登录，如果没有登录则跳转到login.aspx页面。在此页码中，要求用户输入商品的名称、价格、上传日期和图片，单击“插入数据“按钮时，将图片上传到网站的images文件夹中（请先建立此文件夹），同时将商品的名称、价格、上传日期和图片在网站的相对路径（如~/images/1.jpg）保存到goods_info表中。(Done)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;

public partial class goodsInsert : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnInsert_Click(object sender, EventArgs e)
    {
        string savePath = Server.MapPath("~/images/");
        if (FileUpload1.HasFile)
        {
            String filename = FileUpload1.FileName;
            savePath += filename;
            FileUpload1.SaveAs(savePath);
        }
        string goodsname = tbGoodsName.Text.ToString();
        string goodsprice = tbGoodsPrice.Text.ToString();
        string goodsdate = tbGoodsDate.Text.ToString();
        string connStr = @"Data Source=.\SQLEXPRESS;AttachDbFilename=D:\My Documents\Test.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
        string sqlStr = @"Insert into goods_info(goods_name, goods_price, goods_date, goods_images) values('";
        sqlStr += goodsname + "'," + goodsprice + ",'" + goodsdate + "','" + savePath + "')";

        using (SqlConnection conn = new SqlConnection(connStr))
        {
            conn.Open();
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandText = sqlStr;
                cmd.ExecuteNonQuery();  //执行sql语句，插入数据
            }
        }
        Response.Write("<script>alert('插入成功！！！');</script>");

    }
}

4、新建goodsadmin页面，首先判断用户是否已经登录，如果没有登录则跳转到login.aspx页面。在此页码中，要求用gridview显示所有的商品信息，并在gridview中为商品添加“编辑“和”删除“功能。(Done)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;

public partial class goodsAdmin : System.Web.UI.Page
{
    //连接字符串
    string connStr = "Data Source=.\\SQLEXPRESS;AttachDbFilename=D:\\My Documents\\Test.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
    DataSet ds;
    protected void Page_Load(object sender, EventArgs e)
    {
        //如果用户没有登陆
        if (Session["username"] == null)
        {
            Response.Redirect("~/login.aspx");

        }
        else
        {
            bind();
        }
    }

    /// <summary>
    /// 数据绑定到gridView
    /// </summary>
    public void bind()
    {
        string sqlStr = "select * from goods_info";
        using (SqlConnection conn = new SqlConnection(connStr))
        {
            conn.Open();
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandText = sqlStr;
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                ds = new DataSet();
                adapter.Fill(ds);
            }
        }
        GridView1.DataSource = ds;
        GridView1.DataBind();
    }

    /// <summary>
    /// 为gridview 添加编辑功能
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        //设计要编辑的行
        GridView1.EditIndex = e.NewEditIndex;
        bind();
    }

    /// <summary>
    /// 删除操作
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string goods_name = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[0].Controls[0])).Text.ToString();
        string sql = "delete from goods_info where goods_name = '" + goods_name + "'";
        using (SqlConnection conn = new SqlConnection(connStr))
        {
            conn.Open();
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandText = sql;
                cmd.ExecuteNonQuery();
            }
        }
        GridView1.EditIndex = -1;
        bind();
    }
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView1.EditIndex = -1;
        bind();
    }
}

5、 在网站中添加”App_Code”文件夹，在其中添加一个类，在此类中分别定义可以实现建立数据库连接、执行sql查询语句和执行sql更新语句的方法。（Done）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
using System.Data;

/// <summary>
///SqlHelp 的摘要说明
/// </summary>
public class SqlHelper
{
    //连接字符串
    private static string connStr = "Data Source=.\\SQLEXPRESS;AttachDbFilename=D:\\My Documents\\Test.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
    private SqlConnection conn = null;
    private SqlCommand cmd = null;
    private SqlDataReader dataReader = null;
    private DataSet ds = null;
    /// <summary>
    /// 获得数据库对象
    /// </summary>
    /// <returns></returns>
    public SqlConnection getConnection()
    {
        conn = new SqlConnection(connStr);
        return conn;
    }

    /// <summary>
    /// 返回查询结果
    /// </summary>
    /// <param name="sql"></param>
    /// <returns></returns>
    public SqlDataReader executeNonQuery(string sql)
    {
        if (conn == null)
        {
            conn = getConnection();
        }
        cmd = new SqlCommand(sql, conn);
        conn.Open();
        return cmd.ExecuteReader();
    }
    /// <summary>
    /// 更新操作
    /// </summary>
    /// <param name="sql"></param>
    /// <returns></returns>
    public int update(string sql)
    {
        if (conn == null)
        {
            conn = getConnection();
        }
        cmd = new SqlCommand(sql, conn);
        conn.Open();
        int i = cmd.ExecuteNonQuery();
        return i;
    }

    /// <summary>
    /// 给定sql语句，返回结构集
    /// </summary>
    /// <param name="sql"></param>
    /// <returns></returns>
    public DataSet executeDataSet(string sql)
    {
        if (conn == null)
        {
            conn = getConnection();
        }
        cmd = new SqlCommand(sql, conn);
        conn.Open();
        SqlDataAdapter adapter = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        adapter.Fill(ds);
        return ds;
    }
    /// <summary>
    /// 关闭数据库连接
    /// </summary>
    public void close()
    {
        if (conn != null)
        {
            conn.Close();
        }
    }
}

6、 新建index.aspx页面,在此页面中通过datalist控件来显示goods_info表中每个商品的商品的名称、价格、上传日期和图片，并在每个商品的下面添加一个按钮，当单击按钮时，弹出对话框显示该按钮被单击的次数。(Done)

7、 新建goodsnum.aspx页面，在此页面的Page_Load事件中，首先定义一个DataTable,分别包含三列

列名 类型
namestring

pricefloat

numint

并编程在此表中添加三条记录。通过GridView显示此表中的数据。(Done)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;
using System.Data;

public partial class index : System.Web.UI.Page
{
    private DataTable dt;

    protected void Page_Load(object sender, EventArgs e)
    {
        /**定义一个DataTable,分别包含三列
            列名    类型
            name   string 
            price    float
            num    int
        **/

        dt = new DataTable();
        DataColumn col = new DataColumn();
        col.ColumnName = "name";
        col.DataType = System.Type.GetType("System.String");
        dt.Columns.Add(col);

        col = new DataColumn();
        col.ColumnName = "price";
        col.DataType = System.Type.GetType("System.Single");
        dt.Columns.Add(col);

        col = new DataColumn();
        col.ColumnName = "num";
        col.DataType = System.Type.GetType("System.Int32");
        dt.Columns.Add(col);

        Bind();
    }

    /// <summary>
    /// 通过编程来实现往DataTable里添加数据，并绑定到GridView当中
    /// </summary>
    public void Bind()
    {

        DataRow row = dt.NewRow();
        row["name"] = "zhangsan";
        row["price"] = 11.0f;
        row["num"] = 10;
        dt.Rows.Add(row);


        row = dt.NewRow();
        row["name"] = "lishi";
        row["price"] = 12.0f;
        row["num"] = 50;
        dt.Rows.Add(row);


        row = dt.NewRow();
        row["name"] = "wangwu";
        row["price"] = 13.0f;
        row["num"] = 100;
        dt.Rows.Add(row);
        gridView.DataSource = dt.DefaultView;
        gridView.DataBind();
    }
}

8、建立一个Web服务，要求根据商品名称，通过查询goods_info表返回商品的价格。

 /// <summary>
    /// 定义一个服务方法，根据商品名称，通过查询goods_info表返回商品的价格。
    /// </summary>
    /// <param name="goodsname"></param>
    /// <returns></returns>
    [WebMethod]
    public double getPrice(string goodsname)
    {
        string connStr = @"Data Source=.\SQLEXPRESS;AttachDbFilename=D:\My Documents\Test.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
        string sqlStr = "select * from goods_info where goods_name = '" + goodsname + "'";
        using (SqlConnection conn = new SqlConnection(connStr))
        {
            conn.Open();
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandText = sqlStr;
                DataSet ds = new DataSet();
                SqlDataAdapter sda = new SqlDataAdapter(cmd);
                sda.Fill(ds);
                DataTable dt = ds.Tables[0];
                DataRow rows = dt.Rows[0];
                double price = (double)rows["goods_price"];
                return price;
            }
        }
    }