ASP 无限级分类实现

asp递归无限级分类函数

<%
'函数：getcatagory
'功能：获得分类列表
'参数：cat_arr -> 分类数组(rscordset:id:分类编号,pid:上级分类,classname:分类名称,childs:子分类)
' 按此输出些sql语句，用getrows获取得到的数据
' cat_pid -> 上级分类编号
' cat_childs -> 下级分类编号
' cat_select -> 选择的分类
' cat_dir -> 分类级别
'返回：返回分类列表(option)

dim conn,cmd,rs,cat_arr
set conn = server.createobject("adodb.connection")
set cmd = server.createobject("adodb.command")

conn.open "provider=microsoft.jet.oledb.4.0; data source=" & server.mappath("db1.mdb")
cmd.activeconnection = conn
cmd.commandtext = "select * from cate order by id desc"
set rs = cmd.execute
cat_arr = rs.getrows()
set rs = nothing
set cmd = nothing
set conn = nothing

getcatagory cat_arr,0,"","","","{$cat.dir}├─<a href=""?id={$cat.id}"" title=""分类级别：{$cat.dir} 分类编号：{$cat.id} 分类上级编号：{$cat.pid} 分类名称：{$cat.name} 分类子分类：{$cat.childs}"">{$cat.name} </a><br />"&vbcrlf

function getcatagory(byval cat_arr,byval cat_pid,byval cat_childs,byval cat_select,byval cat_dir,byval format)
dim i,tmp
if isarray(cat_arr) then
for i=0 to ubound(cat_arr,2)
if cat_arr(1,i) = cat_pid and instr("," & cat_childs & ",","," & cat_arr(0,i) & ",") = 0 then
tmp = format
if instr(tmp,"{$cat.dir}")>0 then tmp = replace(tmp,"{$cat.dir}",cat_dir)
if instr(tmp,"{$cat.id}")>0 then tmp = replace(tmp,"{$cat.id}",cat_arr(0,i))
if instr(tmp,"{$cat.pid}")>0 then tmp = replace(tmp,"{$cat.pid}",cat_arr(1,i))
if instr(tmp,"{$cat.name}")>0 then tmp = replace(tmp,"{$cat.name}",cat_arr(2,i))
if instr(tmp,"{$cat.childs}")>0 then tmp = replace(tmp,"{$cat.childs}",cat_arr(3,i))
response.write tmp
call getcatagory(cat_arr,cat_arr(0,i),cat_childs,cat_select,cat_dir & "│",format)
end if
next
end if
end function
%>

转载的一个递归函数，比较典型的应用，没有特别算法，目前我们一般常见的无限级分类函数均大同小异。简单整理了一下，包括示例打包getcatagory.rar

*大类1
└二级小类1
└三级小类1
└四级小类1
└五级小类1
*大类2
└二级小类2
*大类3

数据库说明:数据库db.mdb,classtable表的结构:classid类别id（自动增长） parentid 父级id 默认为0 (0代表*) classname类别名,classdepth是为了记录类别的级数 ———————————————-
| classid| classname| parentid | classdepth |
———————————————-

主要代码:

//先取出*(parentid=0)的分类

<%
set conn=server.createobject("adodb.connection")
conn.open "provider=microsoft.jet.oledb.4.0;data source="&server.mappath("db.mdb")
set rs1=server.createobject("adodb.recordset")
sql1="select * from classtable where parentid=0 order by classid"
rs1.open sql1,conn,1,1
if rs1.eof or rs1.bof then
response.write"还没分类!"
else
while not rs1.eof
id1=rs1("classid")
name1=rs1("classname")

response.write "*<a href='class.asp?id="&id1&"&name="&name1&"‘>"&name1&"</a><br>"
parentid1=rs1("parentid")
call reclass(id1)
rs1.movenext
wend
end if
rs1.close
set rs1=nothing


sub reclass(id)
‘递归调用函数,生成一个类别代码
set rs=server.createobject("adodb.recordset")
sql="select * from classtable where parentid="&id
rs.open sql,conn,1,1
i=1
while not rs.eof
id0=rs("classid")
classname0=rs("classname")
parentid0=rs("parentid")
classdepth0=rs("classdepth")
brstr=""
for j=1 to classdepth0
brstr=" "&brstr
next
response.write(brstr&"└<a href='class.asp?id="&id0&"&name="&classname0&"‘>"&classname0&"</a><br>")
call reclass(id0)

rs.movenext
i=i+1
wend
rs.close
set rs=nothing
end sub

if request("a")="add" then
call add
end if
if request("name")<>"" then
%>
<table width="80%" align="center" cellpadding="0″ cellspacing="0″>
<form action="class.asp?a=add&id=<%=request("id")%>" method="post">
<tr>
<td> </td>
<td>在<font color="#ff0000″><%=request("name")%></font>添加小类</td>
</tr>
<tr>
<td>类别名:</td>
<td><input name="classname" type="text" id="classname"></td>
</tr>
<tr>
<td> </td>
<td><input type="submit" name="submit" value="提交"></td>
</tr>
</form>
</table>
<%end if
sub add '添加类别
id=request("id")
classname=request("classname")
set rs=server.createobject("adodb.recordset")
rs.open "select parentid,classdepth from classtable where classid="&id,conn,1,1
parentid=rs(0)
classdepth=rs(1)+1
rs.close
set rs=nothing
sql="insert into classtable (classname,parentid,classdepth) values ('"&classname&"‘,"&id&","&classdepth&")"
conn.execute sql
response.write"<script>alert('添加成功!');location.href='class.asp';</script>"
end sub
%>