如何用asp编写类似搜索引擎功能的代码 -pc6资讯

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如何用asp编写类似搜索引擎功能的代码 时间：2010/2/5 11:27:00来源：本站整理作者：我要评论(0)

如何用asp编写类似搜索引擎功能的代码：

首先建一个access 数据库，库中有一个URLINDEX表，其中URL和Keywords字段分别添加了索引，如下：

URL            文本 (索引:有(无重复))
Title            文本
Description 文本
Summary    文本
Keywords   文本(索引:有(无重复))

程序文件doquery.asp，代码：

<HTML><HEAD><TITLE>简单搜索引擎</TITLE></HEAD>
<BODY BGCOLOR=#ffffff MARGINWIDTH="0" MARGINHEIGHT="0"
LEFTMARGIN=0 TOPMARGIN=0>
<FORM METHOD="post" ACTION="doquery.asp?act=search">
Query: <INPUT TYPE="Text" NAME="QueryString"><BR>
<INPUT TYPE="Submit" VALUE="Submit">
</FORM>
</CENTER>

<%
dim act
act=request("act")
if(act="search") then
QueryString = Request.form( "QueryString" )
QueryWords  = Split( QueryString )
strIndent   = "          "

’ 如果搜索为空则返回
If QueryString = "" Then
  Response.Redirect( "default.asp" )
End If

Session.timeout = 2
If IsObject(Session("sitesearch_conn")) Then
     Set conn = Session("sitesearch_conn")
Else
     Set conn = Server.CreateObject("ADODB.Connection")
     conn.open "driver={Microsoft Access Driver (*.mdb)};dbq=" & Server.MapPath("database/SiteSearch.mdb"),"",""
     Set Session("sitesearch_conn") = conn
End If

’ 查询语句
sql = "SELECT * FROM [URLIndex] WHERE"

’搜索Description字段
sql = sql & " ( [Description] LIKE ’%" & QueryWords( 0 ) & "%’"   ’ First
For i = LBound( QueryWords ) + 1 to UBound( QueryWords )
  If QueryWords( i ) <> "" and UCase( QueryWords(i) ) <> "OR" and UCase( QueryWords(i) ) <> "AND" Then
   If uCase( QueryWords( i-1 ) ) = "OR" Then
    sql = sql & " OR [Description] LIKE ’%" & QueryWords( i ) & "%’"
   Else
    sql = sql & " AND [Description] LIKE ’%" & QueryWords( i ) & "%’"
   End If
  End If
Next

’ 搜索Keywords字段
sql = sql & " ) OR ( [Keywords] LIKE ’%" & QueryWords( 0 ) & "%’"
For i = LBound( QueryWords ) + 1 to UBound( QueryWords )
  If QueryWords( i ) <> "" and UCase( QueryWords(i) ) <> "OR" and UCase( QueryWords(i) ) <> "AND" Then
   If uCase( QueryWords( i-1 ) ) = "OR" Then
    sql = sql & " OR [Keywords] LIKE ’%" & QueryWords( i ) & "%’"
   Else
    sql = sql & " AND [Keywords] LIKE ’%" & QueryWords( i ) & "%’"
   End If
  End If
Next

’  搜索Title字段
sql = sql & " ) OR ( [Title] LIKE ’%" & QueryWords( 0 ) & "%’"
For i = LBound( QueryWords ) + 1 to UBound( QueryWords )
  If QueryWords( i ) <> "" and UCase( QueryWords(i) ) <> "OR" and UCase( QueryWords(i) ) <> "AND" Then
   If uCase( QueryWords( i-1 ) ) = "OR" Then
    sql = sql & " OR [Title] LIKE ’%" & QueryWords( i ) & "%’"
   Else
    sql = sql & " AND [Title] LIKE ’%" & QueryWords( i ) & "%’"
   End If
  End If
Next

’ 搜索Summary字段
sql = sql & " ) OR ( [Summary] LIKE ’%" & QueryWords( 0 ) & "%’"
For i = LBound( QueryWords ) + 1 to UBound( QueryWords )
  If QueryWords( i ) <> "" and UCase( QueryWords(i) ) <> "OR" and UCase( QueryWords(i) ) <> "AND" Then
   If uCase( QueryWords( i-1 ) ) = "OR" Then
    sql = sql & " OR [Summary] LIKE ’%" & QueryWords( i ) & "%’"
   Else
    sql = sql & " AND [Summary] LIKE ’%" & QueryWords( i ) & "%’"
   End If
  End If
Next

sql = sql & " )"

    ’
    Set rs = Server.CreateObject("ADODB.Recordset")
    rs.Open sql, conn, 3, 3

    Response.Write "<BR><B> 你搜索的是: </B> " & QueryString

    Response.Write "<BR><B> 搜索的关键字: </B> "
For i = LBound( QueryWords ) to UBound( QueryWords )
  Response.Write "<BR>" & strIndent & i & ": " & QueryWords( i )
Next

    ’ Print the SQL String
    Response.Write "<BR><B> sql 语句 : </B> " & sql

’ Print the Results
    Response.Write "<BR><B> 结果    : </B> <UL>"
On Error Resume Next
rs.MoveFirst
Do While Not rs.eof
  Response.Write "<BR>" & "<A HREF=’OpenPage.asp?IndexURL=" & rs.Fields("URL").Value & "’>" & rs.Fields("Title") & "</A> - "
  Response.Write rs.Fields("Description") & "<BR>"
  Response.Write "     <FONT SIZE=2>URL: " & rs.Fields("URL") & "</FONT>"
  Response.Write "<HR SIZE=1 WIDTH=200 ALIGN=LEFT>"
  rs.MoveNext
Loop
Response.Write "</UL>"

end if
%>

</BODY>
</HTML>

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