asp/asp.net中遍历树型结构.
据库:SqlServer2000
表:tree
表结构:
测试数据:
算法:使用递归实现
======================================
asp代码:
<%@ Language = VBScript%>
<%Option Explicit%>
<%
Dim oConn, sSql
Call DBConnBegin()
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Dim sTableName
Dim nCurrent, nLen, aTree()
sTableName = "tree"
nCurrent = 1
nLen = GetRescordCount()
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
ReDim aTree(nLen)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Call GetPowerName(0)
'Dim i
'For i = 1 To nLen
'Response.Write aTree(i) & "<br>"
'Next
Call DBConnEnd()
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Function GetRescordCount()
GetRescordCount = oConn.Execute("select count(id) from " & sTableName)(0)
End Function
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Sub GetPowerName(s_Id)
Dim n_ParentId, j, oRs
Set oRs = Server.CreateObject( "ADODB.Recordset" )
sSql = "select id,PowerName,Layer from " & sTableName & " where ParentId=" & s_Id
oRs.Open sSql, oConn, 0, 1
Do While Not oRs.Eof
For j = 1 To oRs("Layer")
response.write " "
Next
aTree(nCurrent) = oRs("PowerName")
response.write aTree(nCurrent) & "<br>"
nCurrent = nCurrent + 1
n_ParentId = oRs("id")
Call GetPowerName(n_ParentId)
oRs.MoveNext
Loop
oRs.Close
Set oRs = Nothing
End Sub
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Sub DBConnBegin()
' 如果数据库对象已打开,不要再打开
If IsObject(oConn) = True Then Exit Sub
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
' 你可以不需要打开数据库连接对象而直接打开记录集对象,但如果你需要打开多个记录集对象的话,效率是很低的。
' 如果你不创建一个数据库连接对象,ADO会在每个记录集打开时自动创建一个新的数据库连接对象,就算你用的是相同的SQL语句。
Set oConn = Server.CreateObject("ADODB.Connection")
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
On Error Resume Next
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
'Provider=SQLOLEDB.1;Server=(local);Initial Catalog =cx_soft;Integrated Security=SSPI;
'Provider=SQLOLEDB.1;Server=(local);Initial Catalog =cx_soft;Trusted_Connection=yes;
oConn.Open "Provider=sqloledb.1;Data Source=(local);Initial Catalog=AspNetTest;User Id=sa;Password=;"
If Err.Number > 0 Then
' 完全地退出正在运行的脚本
Response.End
End If
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
' 创建一个记录集
End Sub
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Sub DBConnEnd()
On Error Resume Next
oRs.Close
Set oRs = Nothing
oConn.Close
Set oConn = Nothing
End Sub
%>
asp.net代码:
(请注意:asp.net1.1中用同一个Connection,在前一个DataReader没有Close情况下再创建DataReader会出现错误提示:已有打开的与此连接相关联的 DataReader,必须首先将它关闭
我的做法是每次都创建一个Connection,很浪费资源,不知道有没其他好办法.
)
遍历结果:
代码下载:
asp代码:/Files/jiny-z/tree(asp).rar
asp.net代码:/Files/jiny-z/tree(asp.net).rar
*********************************************************
根据chill ,flower.b的提示,修改了代码。
原来:asp/asp.net代码中都是在数据集中循环,效率较低.。
现在:asp代码改为在数组中循环,asp.net代码改为在DataTable中循环。
*********************************************************
asp代码:
<%@ Language = VBScript%>
<%Option Explicit%>
<%
Dim oConn, oRs, sSql
Dim aTree
Call FillArrayFromRs()
Call blTreeArray(0)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Sub FillArrayFromRs()
Dim s_TableName
s_TableName = "tree"
Call DBConnBegin()
Set oRs = Server.CreateObject( "ADODB.Recordset" )
sSql = "select Id,PowerName,Layer,ParentId from " & s_TableName
oRs.Open sSql, oConn, 0, 1
aTree = oRs.GetRows()
'response.write ubound(aTree, 2)
oRs.Close
Call DBConnEnd()
End Sub
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Sub blTreeArray(n_ParentId)
Dim row, rows
Dim n_NextParentId
Dim n_Space
rows = UBound(aTree, 2)
for row = 0 To rows
If aTree(3, row) = n_ParentId Then
for n_Space = 1 To aTree(2, row)
Response.Write " "
Next
Response.Write aTree(1, row) & "<br>"
n_NextParentId = aTree(0, row)
blTreeArray(n_NextParentId)
End If
Next
End Sub
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Sub DBConnBegin()
' 如果数据库对象已打开,不要再打开
If IsObject(oConn) = True Then Exit Sub
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
' 你可以不需要打开数据库连接对象而直接打开记录集对象,但如果你需要打开多个记录集对象的话,效率是很低的。
' 如果你不创建一个数据库连接对象,ADO会在每个记录集打开时自动创建一个新的数据库连接对象,就算你用的是相同的SQL语句。
Set oConn = Server.CreateObject("ADODB.Connection")
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
On Error Resume Next
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
'Provider=SQLOLEDB.1;Server=(local);Initial Catalog =cx_soft;Integrated Security=SSPI;
'Provider=SQLOLEDB.1;Server=(local);Initial Catalog =cx_soft;Trusted_Connection=yes;
oConn.Open "Provider=sqloledb.1;Data Source=(local);Initial Catalog=AspNetTest;User Id=sa;Password=;"
If Err.Number > 0 Then
' 完全地退出正在运行的脚本
Response.End
End If
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
' 创建一个记录集
End Sub
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
Sub DBConnEnd()
On Error Resume Next
oRs.Close
Set oRs = Nothing
oConn.Close
Set oConn = Nothing
End Sub
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
%>
asp.net代码:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace AspNetTest.Common
{
/// <summary>
/// tree_DataTable 的摘要说明。
/// </summary>
public class tree_DataTable : System.Web.UI.Page
{
private DataTable dtPowerTree = new DataTable();
const string tablename = "tree";
private void Page_Load(object sender, System.EventArgs e)
{
FillTreeDataTable();
blTreeDataTable(0);
dtPowerTree.Clear();
// 在此处放置用户代码以初始化页面
}
private void FillTreeDataTable()
{
string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
SqlConnection conn = new SqlConnection(ConnectionString);
SqlDataAdapter da = new SqlDataAdapter("select Id,PowerName,Layer,ParentId from " + tablename, conn);
da.Fill(dtPowerTree);
}
private void blTreeDataTable(int _ParentId)
{
string filter = "ParentId=" + _ParentId;
string sort = "Id ASC";
DataRow[] drs = dtPowerTree.Select(filter, sort);
for(int i=0; i<drs.Length; i++)
{
if(Convert.ToInt32(drs[i][3]) == _ParentId)
{
int Id = Convert.ToInt32(drs[i][0]);
string PowerName = drs[i][1].ToString();
int Layer = Convert.ToInt32(drs[i][2]);
for(int space=1; space<=Layer; space++)
{
Page.Response.Write(" ");
}
Page.Response.Write(PowerName + "<br>");
blTreeDataTable(Id);
}
}
}
Web 窗体设计器生成的代码
}
}
表:tree
表结构:
测试数据:
算法:使用递归实现
======================================
asp代码:
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
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asp.net代码:
(请注意:asp.net1.1中用同一个Connection,在前一个DataReader没有Close情况下再创建DataReader会出现错误提示:已有打开的与此连接相关联的 DataReader,必须首先将它关闭
我的做法是每次都创建一个Connection,很浪费资源,不知道有没其他好办法.
)
1
using System;
2
using System.Collections;
3
using System.ComponentModel;
4
using System.Data;
5
using System.Drawing;
6
using System.Web;
7
using System.Web.SessionState;
8
using System.Web.UI;
9
using System.Web.UI.WebControls;
10
using System.Web.UI.HtmlControls;
11
using System.Data.SqlClient;
12![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
13
namespace AspNetTest.Common
14
{
15
/// <summary>
16
/// tree 的摘要说明。
17
/// </summary>
18![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
19
public class tree : System.Web.UI.Page
20
{
21
private string tablename = "tree";
22
int current = 0;
23
int len = 0;
24
string[] arrPowerName;
25
string ConnectionString;
26
public tree()
27
{
28
ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
29
len = GetRecordCount();
30
arrPowerName = new string[len];
31
}
32
private void Page_Load(object sender, System.EventArgs e)
33
{
34
35
GetPowerName(0);
36
//CloseDbConnection();
37
//ResponseArray();
38
// 在此处放置用户代码以初始化页面
39
}
40
private void GetPowerName(int _ParentId)
41
{
42
int Id;
43
string PowerName;
44
string sql = "select Id,PowerName,Layer from " + tablename + " where ParentId=" + _ParentId;
45
try
46
{
47
SqlConnection conn = new SqlConnection(ConnectionString);
48
conn.Open();
49
SqlCommand cmd = new SqlCommand(sql, conn);
50
SqlDataReader dr = cmd.ExecuteReader();
51
while(dr.Read())
52
{
53
for(int j=0; j<int.Parse(dr["Layer"].ToString()); j++)
54
{
55
Response.Write(" ");
56
}
57
PowerName = dr["PowerName"].ToString();
58
Response.Write(PowerName + "<br>");
59
arrPowerName[current++] = PowerName;
60
Id = int.Parse(dr["Id"].ToString());
61
GetPowerName(Id);
62
}
63
dr.Close();
64
conn.Close();
65
}
66
catch(Exception ex)
67
{
68
Response.Write(ex.ToString());
69
}
70
}
71
private void ResponseArray()
72
{
73
int i;
74
for(i=0; i<len; i++)
75
{
76
Response.Write(arrPowerName[i] + "<br>");
77
}
78
}
79
private void CloseDbConnection()
80
{
81
//conn.Close();
82
}
83
private int GetRecordCount()
84
{
85
SqlConnection conn = new SqlConnection(ConnectionString);
86
string sql = "select count(id) from " + tablename;
87
conn.Open();
88
SqlCommand cmd = new SqlCommand(sql, conn);
89
int count = int.Parse(cmd.ExecuteScalar().ToString());
90
conn.Close();
91
return count;
92
}
93
94
Web 窗体设计器生成的代码
114
}
115
}
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遍历结果:
代码下载:
asp代码:/Files/jiny-z/tree(asp).rar
asp.net代码:/Files/jiny-z/tree(asp.net).rar
*********************************************************
根据chill ,flower.b的提示,修改了代码。
原来:asp/asp.net代码中都是在数据集中循环,效率较低.。
现在:asp代码改为在数组中循环,asp.net代码改为在DataTable中循环。
*********************************************************
asp代码:
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
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asp.net代码:
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://jiny-z.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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