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购物网第一阶段总结笔记7：新闻管理模块之管理新闻（修改，删除）

2011-09-23 08:59 429 查看

1：和友情链接的管理一样，新建一个news_list.aspx页面，然后添加表格比便于显示数据，最后添加一个分页控件，以备后用

aspx最终代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="news_list.aspx.cs" Inherits="Web.admin.news_list" %>

<%@ Register Assembly="AspNetPager" Namespace="Wuqi.Webdiyer" TagPrefix="webdiyer" %>

<!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></title>
<style type="text/css">
.style1 {
width: 100%;
border-style: solid;
border-width: 1px;
}
</style>
</head>
<body>
<form id="form1" runat="server">

<h1>
<asp:Literal ID="litH1" Text="新闻中心列表" runat="server"></asp:Literal></h1><br />
<table class="style1">
<tr>
<td>
标题</td>
<td>
创建时间</td>
<td>
访问量</td>
<td>
操作</td>
</tr>
<asp:Repeater ID="replist" runat="server">
<ItemTemplate>
<tr>
<td>
<%#Eval("title") %></td>
<td>
<%#Eval("createDate") %></td>
<td>
<%#Eval("visitnum") %></td>
<td>
<a href='news_add.aspx?id=<%#Eval("id") %>'>修改</a>
<asp:LinkButton ID="lbtnDel" OnClick="Del" CommandArgument='<%#Eval("id") %>' OnClientClick="return confirm('是否确定删除？')" runat="server">删除</asp:LinkButton>

</td>
</tr>
</ItemTemplate>
</asp:Repeater>

<tr>
<td colspan="4">
<webdiyer:AspNetPager ID="anp" runat="server" CustomInfoHTML="总%PageCount%页,第%CurrentPageIndex%页/%PageCount%页" FirstPageText="首页"
LastPageText="尾页" NextPageText="下一页" NumericButtonCount="5" PageSize="5"
PrevPageText="上一页" ShowCustomInfoSection="Left" SubmitButtonText="GO" onpagechanged="anp_PageChanged">

</webdiyer:AspNetPager>
</td>
</tr>
</table>

</form>
</body>
</html>

然后，在主页中添加“管理”的超链接，链接到这个页面

新闻中心管理<br />
<a href="news_add.aspx" target="frm">增加</a><br />
<a href="news_list.aspx" target="frm">管理</a><br />
<br />
商品专题管理<br />
<a href="news_add.aspx?type=spzt" target="frm">增加</a><br />
<a href="news_list.aspx?type=spzt" target="frm">管理</a><br />

:2：CS代码：

第一步：实现从数据库调出数据，并以类别分开显示到商品专题和新闻中心的页面上，然后实现删除功能：

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

BindRep();
}
}

public string GetCond()
{
string cond = "";
string type = Request.QueryString["type"];
if (!string.IsNullOrEmpty(type) && type == "spzt")
{
cond = "type='商品专题'";
}
else
{
cond = "type='新闻中心'";
}

return cond;
}

private void BindRep()
{
replist.DataSource = new MyShop.DAL.NewsDAO().GetList(GetCond());
replist.DataBind();
}
//删除
protected void Del(object sender,EventArgs e)
{
string id = (sender as LinkButton).CommandArgument;
new MyShop.DAL.NewsDAO().Delete(int.Parse(id));
BindRep();
}

第二步：实现数据分页显示（分页显示控件）

1、修改NewsDAO表，和超链接管理的LinkDAO一样，做两项改动：修改一个分页显示函数和添加一个计算记录数的函数

/// <summary>
/// 1: 分页获取数据列表
/// </summary>
/// <param name="fields">查询出要排序的字段</param>
/// <param name="order">排序字段，以哪个字段为基准进行排序</param>
/// <param name="ordertype">排序方式</param>
/// <param name="PageSize">每页显示多少行数据</param>
/// <param name="PageIndex">页码</param>
/// <param name="strWhere">查询where条件</param>
/// <returns></returns>
public DataSet GetList(string fields, string order, string ordertype, int PageSize, int PageIndex, string strWhere)
{
Database db = DatabaseFactory.CreateDatabase();
DbCommand dbCommand = db.GetStoredProcCommand("proc_SplitPage");//存储过程名
db.AddInParameter(dbCommand, "tblName", DbType.AnsiString, "Shop_news");//表名，传入的参数是固定的Shop_link表
db.AddInParameter(dbCommand, "strFields", DbType.AnsiString, fields);//要查询出的字段
db.AddInParameter(dbCommand, "PageSize", DbType.Int32, PageSize);//多少页
db.AddInParameter(dbCommand, "PageIndex", DbType.Int32, PageIndex);//页码
db.AddInParameter(dbCommand, "strOrder", DbType.String, order);//存储过程中的strOrder 字段，以哪个字段进行排序,类型改为String
db.AddInParameter(dbCommand, "strOrderType", DbType.String, ordertype);//排序的方式，升序或者降序
db.AddInParameter(dbCommand, "strWhere", DbType.AnsiString, strWhere);
return db.ExecuteDataSet(dbCommand);
}

/// <summary>
/// 2:在LinkDAO中编写一个计算记录数的方法
/// </summary>
/// <param name="strWhere"></param>
/// <returns></returns>
public int CalcCount(string strWhere)
{
string sql = "select count(1) from Shop_news ";
if (!string.IsNullOrEmpty(strWhere))
{
sql += " Where " + strWhere;//注意，" Where "两边的必须有空格
}
Database db = DatabaseFactory.CreateDatabase();
DbCommand cmd = db.GetSqlStringCommand(sql);
return int.Parse(db.ExecuteScalar(cmd).ToString());

}

2、cs代码

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

namespace Web.admin
{
    public partial class news_list : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                anp.RecordCount = new MyShop.DAL.NewsDAO().CalcCount(GetCond());
                BindRep();
            }
        }

        public string GetCond()
        {
            string cond = "";
            string type = Request.QueryString["type"];
            if (!string.IsNullOrEmpty(type) && type == "spzt")
            {
                cond = "type='商品专题'";
                litH1.Text = "商品专题列表";
            }
            else
            {
                cond = "type='新闻中心'";
            }
            
            return cond;
        }

        private void BindRep()
        {
            replist.DataSource = new MyShop.DAL.NewsDAO().GetList("*", "createdate", "desc", anp.PageSize, anp.CurrentPageIndex, GetCond());
            replist.DataBind();
        }
        //删除
        protected void Del(object sender,EventArgs e)
        {
            string id = (sender as LinkButton).CommandArgument;
            new MyShop.DAL.NewsDAO().Delete(int.Parse(id));
            BindRep();
        }
        //分页事件
        protected void anp_PageChanged(object sender, EventArgs e)
        {
            BindRep();
        }
    }
}

第三步：实现修改功能，当点击修改的时候，页面转跳到news_add.aspx，然后在这个页面中进行修改。

news_add的cs代码：

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

namespace Web.admin
{
public partial class news_add : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string type = Request.QueryString["type"];
if (!string.IsNullOrEmpty(type) && type == "spzt")
{

litH1.Text = "添加商品专题";

}

string id = Request.QueryString["id"];
int x;
if (int.TryParse(id, out x))
{
MyShop.Model.News model = new MyShop.DAL.NewsDAO().GetModel(x);
if (model != null)
{
txttitle.Text = model.title;
txtbody.Text = model.body;
btnadd.Text = "修改";
litH1.Text = "修改";
}

}
}

}

protected void btnadd_Click(object sender, EventArgs e)
{
string title = txttitle.Text;
string body = txtbody.Text;
string type = Request.QueryString["type"];

if (!string.IsNullOrEmpty(type) && type == "spzt")
{
type = "商品专题";

}
else
{
type = "新闻中心";
}

if (title.Length == 0 && body.Length == 0)
{
litmsg.Text = "<span style='color:red;'>新闻标题或者内容不能为空！</span>";
}

//修改新闻
string id = Request.QueryString["id"];
int x;
if (int.TryParse(id, out x))
{
MyShop.Model.News model = new MyShop.DAL.NewsDAO().GetModel(x);
if (model != null)
{
model.title = title;
model.body = body;
new MyShop.DAL.NewsDAO().Update(model);
txttitle.Text = "";
txtbody.Text = "";
litmsg.Text = "<span style='color:bule;'>修改成功！</span>";
return;
}
}

//添加新闻

MyShop.DAL.NewsDAO dao = new MyShop.DAL.NewsDAO();
int res = dao.Add(new MyShop.Model.News()
{
title = title,
body = body,
visitnum = 0,
createDate = DateTime.Now,
type = type
});

if (res > 0)
{
litmsg.Text = "<span style='color:bule;'>添加成功！</span>";
txttitle.Text = "";
txtbody.Text = "";
}
else
{
litmsg.Text = "<span style='color:red;'>添加失败，请联系管理员！</span>";
}

}
}
}

第四步：实现查询功能

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

namespace Web.admin
{
public partial class news_list : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
anp.RecordCount = new MyShop.DAL.NewsDAO().CalcCount(GetCond());
BindRep();
}
}

public string GetCond()
{
string cond = "";
string type = Request.QueryString["type"];
if (!string.IsNullOrEmpty(type) && type == "spzt")
{
cond = "type='商品专题'";
litH1.Text = "商品专题列表";
}
else
{
cond = "type='新闻中心'";
}

if (txtkey.Text.Trim().Length!=0)
{
string key = txtkey.Text.Trim();

cond = "title like '%" + key + "%'";     //此时cond的值把前面的cond的值覆盖了
}
return cond;
}

private void BindRep()
{
replist.DataSource = new MyShop.DAL.NewsDAO().GetList("*", "createdate", "desc", anp.PageSize, anp.CurrentPageIndex, GetCond());
replist.DataBind();
}
//删除
protected void Del(object sender,EventArgs e)
{
string id = (sender as LinkButton).CommandArgument;
new MyShop.DAL.NewsDAO().Delete(int.Parse(id));
BindRep();
}
//分页事件
protected void anp_PageChanged(object sender, EventArgs e)
{
BindRep();
}

//查询
protected void btnSearch_Click(object sender, EventArgs e)
{
anp.RecordCount = new MyShop.DAL.NewsDAO().CalcCount(GetCond());
BindRep();
}
}
}

搜索的缺陷：当在商品专题中搜索时候，也会把新闻中心的东西搜索出来，同样，搜索新闻的时候，也会商品的东西搜索出来，这不是我们想要的结果。

改进一下：

public string GetCond()
{
string cond = "";
string type = Request.QueryString["type"];
if (!string.IsNullOrEmpty(type) && type == "spzt")
{
cond = "type='商品专题'";
litH1.Text = "商品专题列表";

if (txtkey.Text.Trim().Length != 0)
{
string key = txtkey.Text.Trim();

cond += "and title like '%" + key + "%'";
}
}
else
{
cond = "type='新闻中心'";
if (txtkey.Text.Trim().Length != 0)
{
string key = txtkey.Text.Trim();

cond += "and title like '%" + key + "%'";
}
}

return cond;
}

这样就好了。

然后做新闻中心和商品专题的前台页面，很好做，不写笔记了

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标签： string object server database dataset class

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