Asp.net中DataGrid利用DataRelation显示主从表信息(可控制从表信息隐藏和显示).(DataGrid 嵌套)

这是我这个菜鸟做的入门级的程序,与菜鸟们一起分享~~~~~基本效果图:

主页面效果图
(程序主页面图(子表的信息可显示和隐藏))

子页面(修改页面)
(showModalDialog弹出的修改子窗口,可根据情况刷新父窗口)

一.开发环境:
.net 版本:asp.net 1.1.4322.2032
工具:Visual Studio 2003
操作系统:Window Server 2003
数据库:SqlServer 2000

二.程序功能:

1.利用DataRelation在DataGrid中显示主从表信息,从表的信息可以显示/隐藏.

2.支持分页(系统默认分页),支持主表和从表的增加/更新/删除.

3.简要需求说明:
(1)班次(EPM_WorkTime表和班次的值班区间(EPM_WorkTimeChild表之间是一对多的关系.(也许这里没必要这样麻烦,但为了学习,所以如此做了.)

CREATE TABLE [EPM_WorkTimeChild] (
  [id] [int] IDENTITY (1, 1) NOT NULL ,
  [parentid] [int] NOT NULL ,
  [timestart] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
  [timeend] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
  CONSTRAINT [PK_EPM_WorkTimeChild] PRIMARY KEY CLUSTERED
  (
   [id]
  ) ON [PRIMARY]
) ON [PRIMARY]
GO

CREATE TABLE [EPM_WorkTime] (
  [id] [int] IDENTITY (1, 1) NOT NULL ,
  [name] [varchar] (100) COLLATE Chinese_PRC_CI_AS NULL
  CONSTRAINT [PK_EPM_WorkTime] PRIMARY KEY CLUSTERED
  (
   [id]
  ) ON [PRIMARY]
) ON [PRIMARY]
GO

(2)从表中使用了ViewState{"Id"]来保存Request.QueryString方式传递过来的parentid;因为多处用到它,所以使用了ViewStae而不是每次Request.ueryString来获得,不知这里是否合适.

(3)其中的一些JS脚本可以通过注册的方式后台添加,这里没有这样,大都写在ASPX文件中了.
数据库访问没有使用Enterprise Library 等比较好的数据访问封装,对这些不太熟悉.而是拼凑了别人的数据访问类.
(4)子窗口中若选择了确定,则返回后刷新父窗口(因为内容更新了),若选择取消则不刷新父窗口.
(5)关键是下面的一行代码,比葫芦画瓢能用了,但不理解.

DataSource='<%# ((System.Data.DataRowView)(Container.DataItem)).CreateChildView("WorkTime") %>'

三.具体程序代码:
WorkTimeManage.aspx:

<%@ Page language="c#" Codebehind="WorkTimeManage.aspx.cs" AutoEventWireup="false" Inherits="EPNew.WorkTimeManage" SmartNavigation ="true"%>
2

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
3

<HTML>
4

<HEAD>
5

<title>WorkTimeManage</title>
6

<SCRIPT language="JavaScript">
11

<!--
12

//展开和关闭时候显示/隐藏子表信息
13

function showDiv(img,div)
14

{
15

var img = document.getElementById(img);
16

var div = document.getElementById(div);
17

var picName = img.src;
18

picName = picName.substring(picName.lastIndexOf("/")+1);
19

if (picName.toLowerCase() == "close.gif")
20

{
21

div.style.display ="block";
22

img.src = "images/open.gif";
23

}
24

else
25

{
26

div.style.display ="none";
27

img.src = "images/close.gif";
28

}
29

}
30

//-->
33

</SCRIPT>
34

</HEAD>
35

<body MS_POSITIONING="FlowLayout">
36

<form id="Form1" method="post" runat="server">
37

<TABLE id="Table1" cellSpacing="1" cellPadding="1" width="100%" border="0">
38

<TR class="Title">
39

<TD align="center">班次列表</TD>
40

</TR>
41

<TR class="Title">
42

<TD align="left">       值班班次名称: 
43

<asp:textbox id="TxtName" runat="server"></asp:textbox> 
44

<asp:button id="BtnAdd" runat="server" Text="增加值班班次"></asp:button></TD>
45

</TR>
46

<TR>
47

<TD><asp:datagrid id="DataGrid1" runat="server" DataKeyField="id" Width="100%" AutoGenerateColumns="False"
48

ShowHeader="False" BackColor="#fffff6" AllowPaging="True" PageSize="3">
49

<Columns>
50

<asp:TemplateColumn>
51

<ItemTemplate>
52

<TABLE border="0" width="100%">
53

<TR>
54

<TD width="70">
55

<asp:Label ID="LblId" Runat="server" Visible="False" text='<%# DataBinder.Eval(Container.DataItem,"id")%>'>
56

</asp:Label>
57

<asp:Image ID="ImgOpen" Runat="server" open="true" style="cursor:hand" ImageUrl="images/close.gif"></asp:Image></TD>
59

<td>
60

<asp:Label ID ="LblName" Runat="server" Text ='<%# DataBinder.Eval(Container.DataItem,"Name")%>'>
61

</asp:Label>
62

</td>
63

<td width="150">
64

<asp:LinkButton ID="LbtnEdit" Runat="server" Text="修改"></asp:LinkButton>
65

<asp:LinkButton ID="LbtnDel" Runat="server" Text="删除" CommandName="Delete"></asp:LinkButton>
67

</td>
68

</TR>
69

<TR>
70

<TD colspan="3" align="center" bgcolor="#fefefe">
71

<asp:Panel ID="PnlContent" Runat="server" style="display:none" Border="0">
72

<asp:DataGrid ID="DgContent" Runat="server" Width="80%" DataKeyField="id" AutoGenerateColumns= "False" BorderColor="#3677B1" BackColor="#fefefe"
73

DataSource='<%# ((System.Data.DataRowView)(Container.DataItem)).CreateChildView("WorkTime") %>'>
74

<Columns>
75

<asp:BoundColumn DataField="id" HeaderText="序号" HeaderStyle-HorizontalAlign="Center"></asp:BoundColumn>
76

<asp:BoundColumn DataField="TimeStart" HeaderText="开始时间" HeaderStyle-HorizontalAlign="Center"></asp:BoundColumn>
77

<asp:BoundColumn DataField="TimeEnd" HeaderText="结束时间" HeaderStyle-HorizontalAlign="Center"></asp:BoundColumn>
78

</Columns>
79

</asp:DataGrid>
80

</asp:Panel>
81

</TD>
82

</TR>
83

</TABLE>
84

</ItemTemplate>
85

</asp:TemplateColumn>
86

</Columns>
87

<PagerStyle Mode="NumericPages"></PagerStyle>
88

</asp:datagrid></TD>
89

</TR>
90

<TR>
91

<TD></TD>
92

</TR>
93

</TABLE>
94

</form>
95

</body>
96

</HTML>
97

WorkTimeManage.aspx.cs

using System;
2

using System.Collections;
3

using System.ComponentModel;
4

using System.Data;
5

using System.Data.SqlClient;
6

using System.Drawing;
7

using System.Web;
8

using System.Web.SessionState;
9

using System.Web.UI;
10

using System.Web.UI.WebControls;
11

using System.Web.UI.HtmlControls;
12

namespace EPNew
14

{
15

/// <summary>
16

/// WorkTimeManage 的摘要说明。
17

/// </summary>
18

public class WorkTimeManage : System.Web.UI.Page
19

{
20

protected System.Web.UI.WebControls.DataGrid DataGrid1;
21

protected System.Web.UI.WebControls.TextBox TxtName;
22

protected System.Web.UI.WebControls.Button BtnAdd;
23

//数据访问实例
25

protected ClassConn connE = new ClassConn();
26

private void Page_Load(object sender, System.EventArgs e)
28

{
29

// 在此处放置用户代码以初始化页面
30

if(!IsPostBack)
31

{
32

//绑定数据
33

InitData();
34

}
35

}
36

/// <summary>
38

/// 初始化数据
39

/// </summary>
40

private void InitData()
41

{
42

string strSql = "select id,name from EPM_WorkTime order by id ;select * from EPM_WorkTimeChild ";
43

DataSet ds = connE.getDs(strSql);
44

ds.Tables[0].TableName = "farther";
45

ds.Tables[1].TableName = "child";
46

DataColumn dcFarther = ds.Tables["farther"].Columns["id"];
47

DataColumn dcChild = ds.Tables["child"].Columns["parentid"];
48

//主从表的关联
49

DataRelation dRelation = new DataRelation("WorkTime",dcFarther,dcChild,true);
50

ds.Relations.Add(dRelation);
51

DataGrid1.DataSource = ds.Tables["farther"].DefaultView;
52

DataGrid1.DataBind();
53

}
55

Web 窗体设计器生成的代码
79

/// <summary>
82

/// 设置修改按钮打开窗口的JS事件
83

/// 设置展开图片的JS事件.
84

/// 设置删除确认的JS事件
85

/// </summary>
86

/// <param name="sender"></param>
87

/// <param name="e"></param>
88

private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
89

{
90

Label lblName = (Label) e.Item.FindControl("LblName");
91

LinkButton lbtn = (LinkButton) e.Item.FindControl("LbtnEdit");
92

Label lbl = (Label) (e.Item.FindControl("LblId"));
93

System.Web.UI.WebControls.Image img = (System.Web.UI.WebControls.Image)(e.Item.FindControl("ImgOpen"));
94

Panel pnl = (Panel)(e.Item.FindControl("PnlContent"));
95

LinkButton lbtnDel = (LinkButton) (e.Item.FindControl("LbtnDel"));
96

if(img != null && pnl != null && lbtn != null && lbl!= null && lbtnDel != null && lblName != null)
97

{
98

//修改按钮打开窗口的js事件
99

lbtn.Attributes.Add("onclick","var obj = showModalDialog(\"WorkTimeChildManage.aspx?id="+lbl.Text+"&name="
100

+Server.UrlEncode(lblName.Text)+"\",\"workchild\",\"dialogWidth:500px; dialogHeight:500px;help:0;"
101

+"status:0;resizeable:1\");if(obj==\"true\") location.reload(); else return false;");
102

//lbtn.Attributes.Add("onclick","var obj = window.open(\"EmployeeSetPower.aspx?id="+strId+"\");if(obj==false) return false;");
103

//展开图片的JS事件.
104

img.Attributes.Add("onclick","showDiv('"+img.ClientID+"','"+pnl.ClientID+"');return false;");
105

//删除确认
106

lbtnDel.Attributes.Add("onclick","return confirm('该班次的所有值班区间也将删除,确实要删除?');");
107

}
108

109

}
110

111

/// <summary>
112

/// 页码更改事件
113

/// </summary>
114

/// <param name="source"></param>
115

/// <param name="e"></param>
116

private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
117

{
118

DataGrid1.CurrentPageIndex = e.NewPageIndex;
119

//绑定数据
120

InitData();
121

}
122

123

/// <summary>
124

/// 删除值班班次,同时删除两个表的记录(EPM_WorkTime和EPM_WorkTimeChild).
125

/// </summary>
126

/// <param name="source"></param>
127

/// <param name="e"></param>
128

private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
129

{
130

//程序级事务删除
131

string strId = DataGrid1.DataKeys[e.Item.ItemIndex].ToString();
132

connE.Open();
133

SqlTransaction trans = connE.conn.BeginTransaction();
134

SqlCommand cmd = new SqlCommand();
135

cmd.Connection = connE.conn;
136

cmd.Transaction = trans;
137

try
138

{
139

cmd.CommandText= "delete from EPM_WorkTimeChild where parentid ="+strId;
140

cmd.ExecuteNonQuery();
141

cmd.CommandText = "delete from EPM_WorkTime where id ="+strId;
142

cmd.ExecuteNonQuery();
143

trans.Commit();
144

}
145

catch(SqlException Ex1)
146

{
147

trans.Rollback();
148

Response.Write(Ex1.ToString());
149

150

}
151

finally
152

{
153

trans.Dispose();
154

connE.Close();
155

}
156

//为了防止某页数据只剩一条记录删除后发生的错误,要判断当前页的记录数和当前页码
157

if(DataGrid1.Items.Count ==1 && DataGrid1.CurrentPageIndex>0)
158

{
159

DataGrid1.CurrentPageIndex --;
160

}
161

//重新绑定数据
162

InitData();
163

}
164

165

/// <summary>
166

/// 增加一值班班次
167

/// </summary>
168

/// <param name="sender"></param>
169

/// <param name="e"></param>
170

private void BtnAdd_Click(object sender, System.EventArgs e)
171

{
172

connE.builder("select top 1 * from EPM_WorkTime");
173

connE.dr["name"] = this.TxtName.Text.Trim();
174

connE.builderClose();
175

DataGrid1.CurrentPageIndex = 0;
176

//重新绑定数据
177

InitData();
178

}
179

}
180

}
181

四.备注:
本文参考了:
利用ASP.NET DataGrid显示主次关系的数据
http://dotnet.aspx.cc/ShowDetail.aspx?id=149E5DD7-3B32-461e-ACC6-51D1652E6746

posted on 2005-11-12 03:16 猪头阅读(9193) 评论(7) 编辑收藏举报

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