在书写实现这个功能的过程中，我们会使用几个非常重要的asp函数，先来了解一下：
Split()
函数将一个字符串分割并返回分割结果
表达式 Split (S[，d])
实例：
<%
V= Split(A,B,C)
For i = 0 To UBound(V)
Response.Write V(i)
Next
%>
返回结果: A B C

UBound()
函数返回指定数组维数的最大可用下标.
表达式 Ubound(arrayname [, dimension])
实例：
<%
i = Array("Monday","Tuesday","Wednesday")
response.write UBound(i)
%>
返回结果: 2

Rtrim()
函数去掉字符串右边的字符串.
表达式 Rtrim(string)

LTrim()
函数去掉字符串左边的空格.
表达式 LTrim(string)

REPLACE()
函数REPLACE（）是最有用的字符串函数之一。你可以使用REPLACE（）函数，以一个字符串取代另一个字符串的一部分。

下面咱们来看看实现的方法和代码：

searchdata=request("T1") '从文本框中获得输入的关键字
if trim(searchdata)="" then '如果没有关键字的输入或者只输入的空格，警告！
response.write "<script>alert('请输入查询搜索关键字！');history.back();</script>"
response.end
end if

searchdata=replace(searchdata,"'","’")'将获得的字符串中英文单引号换成中文单引号
searchdata=Rtrim(LTrim(searchdata))'去掉获得的字符串最左边空格和最右边空格

sql1="" '网站关键字匹配sql语句
sql2="" '网站标题匹配sql语句
sql3="" '网站简要说明匹配sql语句

searchdatatmp=split(searchdata," ") '将输入的字符串根据空格分开，获得一个数组
max=ubound(searchdatatmp) '得出这个数组的维数，即输入的关键字个数

if max=0 then '如果max等于0说明只输入了一个关键字，那么就不需要循环处理
sql1=sql1&" key like '%" & searchdatatmp(i) & "%' " '网站关键字模糊搜索
sql2=sql2&" sitename like '%" & searchdatatmp(i) & "%' " '网站标题模糊搜索
sql3=sql3&" faq like '%" & searchdatatmp(i) & "%' " '网站简要说明搜索
else '如果含有多个关键字，采用循环处理sql语句
for i=0 to max '如果关键字很多，我们要求每一个搜索都要匹配每一个关键字，通过循环来实现
if i=0 then '写入下面sql语句作为开头，仔细研究一下下面的代码
sql1=sql1&" (key like '%" & searchdatatmp(i) & "%' and "
sql2=sql2&" (sitename like '%" & searchdatatmp(i) & "%' and "
sql3=sql3&" (faq like '%" & searchdatatmp(i) & "%' and "
else
if i=max then '如果循环到最后一个关键字，写入下面sql语句作为结尾
sql1=sql1&" key like '%" & searchdatatmp(i) & "%') "
sql2=sql2&" sitename like '%" & searchdatatmp(i) & "%') "
sql3=sql3&" faq like '%" & searchdatatmp(i) & "%') "
else '如果关键自己不是开头的也不是结尾的，那么循坏写入下面的sql语句
sql1=sql1&" key like '%" & searchdatatmp(i) & "%' and "
sql2=sql2&" sitename like '%" & searchdatatmp(i) & "%' and "
sql3=sql3&" faq like '%" & searchdatatmp(i) & "%' and "
end if
end if
next '循环结束
end if

sql="select * from www where "&sql1&" or "&sql2&" or "&sql3

response.write sql '看看我们这个代码运行的结果是否正确

     在文本框中输入“网人 俱乐部”，然后点击搜索，记住表单的action="文件名"，这个文件里包含以上的代码。

     执行结果：select * from www where (key like '%网人%' and key like '%俱乐部%') or (sitename like '%网人%' and sitename like '%俱乐部%') or (faq like '%网人%' and faq like '%俱乐部%')

     可以看出我们写的代码是正确的了。下一节我们讲解搜索出结果如果排序，以及怎么实现！

方案2：

keyword=trim(request("keyword"))
strkeyword=instr(keyword," ")
if strkeyword=0 then'是否为+号
keyword1=split(keyword,"+")
else
keyword1=split(keyword," ")
end if
Arrayi=ubound(keyword1)
if arrayi=0 then '只有一个关键字时,就不用执行循环了.
sql=sql&" (I_title like '%"&keyword1(i)&"%' or I_Keyword like '%"&keyword1(i)&"%')"
else
for i=0 to Arrayi
if i=0 then'循环到第一个关键词时
sql=sql&" (I_title like '%"&keyword1(i)&"%' or I_Keyword like '%"&Keyword1(i)&"%') and"
else
if i=arrayi then '循环到最后关键词时
sql=sql&" (I_title like '%"&keyword1(i)&"%' or I_Keyword like '%"&Keyword1(i)&"%')"
else
sql=sql&" (I_title like '%"&keyword1(i)&"%' or I_Keyword like '%"&Keyword1(i)&"%') and"
end if
end if
next
end if

改进的类

<%
Class Search
Private objRequest
Private objRs
Private objConn
Private bolExactitude

'*********************************************************
' 初始化/终止程序
'*********************************************************
Private Sub Class_Initialize()
Dim DBPath
'确定使用何种Request集合
If Ucase(Request("Collection")) = "QUERYSTRING" Then
Set objRequest = Request.QueryString
Else
Set objRequest = Request.Form
End If

Set objRs = Server.CreateObject("ADODB.Recordset")
End Sub

Private Sub Class_Terminate()
Set objRequest = Nothing
Set objRs = Nothing
Set objConn = Nothing
End Sub

'*********************************************************
' Set语句： 从外部读取数据库连接对象、查询条件
'*********************************************************
Public Property Let Exactitude(strExactitude)
bolExactitude = strExactitude
End Property

Public Property Set Connection(objConnection)
Set objConn = objConnection
End Property

'*********************************************************
' 私有方法： 模糊查询并“输出结果”
'*********************************************************
Private Function SearchSql()
Dim strItem, strName, strNametmp, strNamemax, Item
Dim sqlF1, sqlF2, sqlF3, sqlSearch
sqlF1 = ""
sqlF2 = ""
sqlF3 = ""
'依次读取输入的多关键字
For Each strItem in objRequest
strName = objRequest(strItem)
Next
strName = Rtrim(Ltrim(strName))      '去掉首尾空格
strNametmp = split(strName, " ")      '将多关键字载入临时数组
strNamemax = Ubound(strNametmp)      '获得临时数组的最大下标

'SQL多关键字查询核心
'单关键字
If bolExactitude = "" Then
If strNamemax = 0 Then
sqlF1 = sqlF1 & " Name LIKE '%" & strName & "%'"
sqlF2 = sqlF2 & " Tel LIKE '%" & strName & "%'"
sqlF3 = sqlF3 & " School LIKE '%" & strName & "%'"
Else
'多关键字
For Item = 0 to strNamemax
If Item = 0 then
sqlF1 = sqlF1 & " (Name LIKE '%" & strNametmp(Item) & "%' OR "
sqlF2 = sqlF2 & " (Tel LIKE '%" & strNametmp(Item) & "%' OR "
sqlF3 = sqlF3 & " (School LIKE '%" & strNametmp(Item) & "%' OR "
Else
If Item = strNamemax then
sqlF1 = sqlF1 & " Name LIKE '%" & strNametmp(Item) & "%') "
sqlF2 = sqlF2 & " Tel LIKE '%" & strNametmp(Item) & "%') "
sqlF3 = sqlF3 & " School LIKE '%" & strNametmp(Item) & "%') "
Else
sqlF1 = sqlF1 & " Name LIKE '%" & strNametmp(Item) & "%' OR "
sqlF2 = sqlF2 & " Tel LIKE '%" & strNametmp(Item) & "%' OR "
sqlF3 = sqlF3 & " School LIKE '%" & strNametmp(Item) & "%' OR "
End If
End If
Next
End If
Else
If strNamemax = 0 Then
sqlF1 = sqlF1 & " [Name] = '"&strName&"'"
sqlF2 = sqlF2 & " [Tel] = '"&strName&"'"
sqlF3 = sqlF3 & " [School] = '"&strName&"'"
End If
End If
sqlSearch = "SELECT * FROM [data] WHERE "&sqlF1&" OR "&sqlF2&" OR "&sqlF3
objRs.Open sqlSearch,objConn,1,1

'输出查询结果
Dim str, str1, str2
If objRs.EOF And objRs.BOF Then
Response.Write "目前通讯录中没有记录"
Else
Do While Not objRs.EOF
'将关键字(单)变成红色
str = Replace(objRs("Name"), strName, "<b style='color:#FF6347'>" & strName & "</b>")
str1 = Replace(objRs("Tel"), strName, "<b style='color:#FF6347'>" & strName & "</b>")
str2 = Replace(objRs("School"),trim(strName),"<b style='color:#FF6347'>" & trim(strName) & "</b>")
Response.Write "姓名："& str &"电话："& str1 &"学校："& str2 &"<br/>"
objRs.MoveNext
Loop
End If
End Function

'*********************************************************
' 公有方法： 由外部调用输出结果
'*********************************************************
Public Function SearchOut()
SearchSql
End Function
End Class
%>

调用类处理
<!-- #include file="searchclass.asp" -->
<%
Dim objFormSearch
Set objFormSearch = New Search

Set objConn = Server.CreateObject("ADODB.Connection")
DBPath = Server.MapPath("search.mdb")
objConn.Open "driver={Microsoft Access Driver (*.mdb)};dbq=" & DBPath

'向类中传递数据库连接对象、查询条件
Set objFormSearch.Connection = objConn
objFormSearch.Exactitude = Request("Exactitude")

'调用内部方法输出查询结果
Response.Write objFormSearch.SearchOut()

Response.Write objFormSearch.Out()
%>

表单
<%@ CODEPAGE = "936" %>
<form method="post" action="sfc.asp">
<input type="hidden" name="Collection" value="Form">
<input type="radio" name="Exactitude" value="True">
name:<input type="text" name="name!^d{3}-\d{3}--\d{4}$">
<input type="submit" value="Go">
</form>